TECHNICAL

Let’s get an overview of technical information on stainless steel BSP threaded fittings.

All our BSP threaded fittings are manufactured to standard ISO 9001:2008. All thread ends conform to standard Din 2999 and ISO 228/1.

Investment casted and stainless steel 316 grade, these are suitable for all environments including marine purposes.

Standard Pressure Rating on most BSP threaded fittings is 150lbs (150PSI / 10Bar).

Female threaded fittings have a parallel BSP thread and male threaded fittings have a tapered BSP thread.

Typical industry applications for stainless steel BSP threaded fittings include food and beverage services, irrigation and pumping, petrochemical, geothermal, marine, agriculture and machinery, automotive and civil services.

There is stainless steel grade 304, and then there is grade 316.

The composition of stainless steel grade 304 has 18-20% Chromium (Cr) and 8-12% Nickel (Ni) while the stainless steel 316 has 16-18% Chromium (Cr) and 10-14% Nickel (Ni) as well as 2-3% Molybdenum (Mo).

What’s the real difference? It means stainless steel grade 316 has a higher resistance to pitting and corrosion in non-oxidising acids. This grade is generally known as a marine grade, which means it can be submerged in salt water or exposed to harsh outdoor conditions.

Stainless steel grade 304 is used for general applications including sanitary process lines for food and beverages.

Different types of tube bends can be referred to by more than one title in New Zealand. It’s important to know the difference between short, medium, long and extra-long tube bends, which can be mistaken for determining the radius of the bend.

The medium bend is the largest seller and is a standard bend across most industries. Other bend types may be used in expanded or condensed situations and to align with existing process lines.

SHORT BEND

• Short radius
• No leg (with exception to 1 1/4″)

MEDIUM BEND – UNI

• Short radius (same as the Short Bend)
• 30-40mm straight leg each end
• Also known as a UNI type bend
• Most commonly used

LONG BEND – NZ

• Long radius
• 30-40mm straight leg each end
• Also known as a NZ type bend

EXTRA LONG BEND

• Long radius (same as the Long Bend)
• 30-125mm straight leg each end

Example:

A= Bend length
B= Bend leg
R= Radius

All the applicable schedule pipe fittings are manufactured to standard ASME B16.

Schedule pipe typically has a welded seam and is therefore technically non-sanitary. The process to manufacture schedule pipe is referred to as hot rolling which implies rolling stainless steel at high temperatures to form into the desired shape. As the stainless steel cools down the metal can naturally contract, therefore accuracy is difficult to control.

The term NB (Nominal Bore) is often used interchangeably with NPS (Nominal Pipe Size). ‘Nominal’ is a non-dimensional number that identifies the hole diameter. The wall thickness of pipe is determined by the schedule. Pipe fittings are available from The Metal Company in Schedule 10S and Schedule 40S. In the engineering industry, this can also be written or referred to as ‘SCH10’ or ‘S10’ and ‘SCH40’ or ‘S40’.

The Metal Company stock a range of schedule pipe fittings including 45° & 90° bends, concentric & eccentric reducers, end caps, tees, sockolets and threadolets.

Aside from the pipe fittings range, The Metal Company offers professional schedule pipe fabrication and BSP threading. We have nominated welders able to create customised fittings, providing you with a quick and easy installation on site. Customisation can include extended barrel nipples, extended weld nipples and female BSP threading.

Typical industry applications for schedule pipe and fittings include transporting fluids, gases, drainage & services, irrigation, pumping, petrochemical, geothermal, marine, agriculture and on machinery.

Stocking stainless steel ANSI Class 3000 (3,000 lbs pressure rating) O’lets are available from The Metal Company in both BSP threaded and socket style to suit schedule pipe sizes.

These are used to connect pipe at a 90° angle. After drilling a hole in the pipe, these fittings can straddle the pipe to cover the hole and be welded in place.

A sockolet has a socket into which pipe can be inserted. A threadolet has a female BSP internal thread into which a male BSP external thread can be inserted.

RJT is an acronym for Ring Joint Type. RJT unions are often referred to as a standard sanitary union. They comprise of a stepped seal which leaves a small crevice where the liner and male part of the union overlap. RJT unions are very popular for frequently dismantled sections of pipework. The Metal Company stock RJT union in sizes ½”, ¾” and 1¼” which are uncommon in New Zealand.

We often get asked for an RJT DIN union. Although DIN may look similar to an RJT union, it has different specifications and the fittings cannot be used together.

RJT is an acronym for Ring Joint Type. RJT unions are often referred to as a standard sanitary union. They comprise of a stepped seal which leaves a small crevice where the liner and male part of the union overlap. RJT fittings are common in New Zealand and are made to suit imperial (inch) tube sizes.

DIN is an acronym for Deutsche Industrial Norm. Originally from Germany, the DIN union is used to connect or access pumps, machinery and processing lines. DIN fittings are common in European countries and are made to suit DN (Diameter Nominal) tube sizes.

What is DIN Inch?

Firstly, let’s explain ‘DIN’. The DIN union is commonly used to connect or access pumps, machinery and processing lines. DIN fittings are scarce in New Zealand and Australia, generally speaking they belong to Europe. Even so, Kiwis and Aussies have been known to use DIN fittings on various contraptions like pumps, imported machines and process equipment.

However DIN fittings only suit DN (Diameter Nominal) tube sizes. This becomes a problem for countries that use imperial (inch) tube because DIN fittings are unable to fit suitably to imperial sizes and DN tube can be difficult to source.

For this reason, The Metal Company developed the DIN Inch Male Part and the DIN Inch Weld Liner which both consist of a DIN union that connects to imperial tube sizes. This is New Zealand and Australia’s answer to European fittings.

DIN Inch fittings can be used with a standard DIN Slotted Nut and DIN Seal.

The RJT C Spanner is suitable for both RJT slotted nuts and DIN slotted nuts from 1” (25.4) to 4” (101.6) sizes. The C Spanner has a hooked spanner function either end of the tool and is able to tighten and release an RJT slotted nut by applying pressure in a lever action.

C Spanners by The Metal Company are manufactured from stainless steel grade 316, making them suitable for multiple applications including marine environments and nearly all corrosive materials.

Camlocks are hose couplings used to rapidly connect and disconnect fittings on piping or hose. The fittings are capable of carrying liquids, powders and granules.

Camlocks are also known Quick-Connect fittings, Quick-Release fittings, Cam & Groove Couplings or simply ‘couplings’. Sometimes the Camlock Handles can be referred to as ‘cams’.

Typical industry applications include irrigation, pumping, oil distribution, petrochemical, agriculture, machinery and food & beverage.

All standard camlocks are manufactured to A-A-59326A.

Getting the correct Camlock type can be tricky, yet it doesn’t need to be. It is time to name things for what they are and list a basic overview of each Camlock.

TYPES OF CAMLOCKS & ACCESSORIES

Type A: This has a male coupler end and a female BSP thread end.

Type B: This has a female coupler end and a male BSP thread end.

Type C: This has a female coupler end and a barbed hosetail end.

Type D: This has a female coupler end and a female BSP thread end.

Type E: This has a male coupler end and a barbed hosetail end.

Type F: This has a male coupler end and a male BSP thread end.

Type TM: This has a male coupler end and a butt weld end to suit imperial tube.

Type TF: This has a female coupler end and a butt weld end to suit imperial tube.

Type DC: A Dust Cap (DC). This is an end cap with a female coupler.

Type DP: A Dust Plug (DP). This is an end plug with a male coupler.

ACCESSORIES

Camlock Handles: Handles to suit female couplers. Sold per pair.

Camlock Pins: Pins hold camlock handles in place on female couplers. Sold per pair.

Camlock Rings & R Clips: Rings and R Clips attach to camlock handles and assist opening and closing handles. Rings can also be used for locking handles in position. Set includes 1x Ring and 1x R Clip.

Camlock Gasket: Gaskets are seated at the connection point of female couplers to seal the camlock union.

Connecting with clients for better efficiency is part of The Metal Company culture. It’s called connection perfection.

A core range of adapters have been developed by The Metal Company to make installation quick, easy, and cost effective. The Weld Nipple Adapter and Weld Socket Adapter are ideal for connecting stainless steel imperial tube to a BSP thread. Meanwhile, you can also adapt from a BSP thread to RJT, Tri Clover or Press-Fit connections with just one fitting.

BSP adapters include the following options:

• BSP male nipple to butt-weld tube connection (Code Prefix: SWNA)
• BSP female socket to butt-weld tube connection (Code Prefix: SWSA)
• BSP male nipple to Tri Clover ferrule (Code Prefix: SWNAFER)
• BSP female socket to Tri Clover ferrule (Code Prefix: SWSAFER)
• BSP male nipple to RJT male part (Code Prefix: SWNAMP)
• BSP male nipple to RJT weld liner and hex nut (Code Prefix: SWNAWL)
• BSP male nipple to Press-Fit connection (Code Prefix: UMA)
• BSP female socket to Press-Fit connection (Code Prefix: UFA)

Sizing of tube is based on the outside diameter (OD) and wall thickness (gauge of the tubing).
This is mostly used in imperial sizes (based on inches) in New Zealand.

Schedule pipe is determined by the ‘nominal bore’ and another non-dimensional number for wall thickness, referred to as the Schedule.

The term NB (Nominal Bore) is often used interchangeably with NPS (Nominal Pipe Size) and DN (Diameter Nominal). “Nominal” is a non-dimensional number that identifies the hole diameter.

To ensure correct supply, always specify at least 2 dimensions you require: Outside diameter (OD), inside diameter (ID), or wall thickness.

The Inline Non Return Valve is a check type valve which is spring actioned for flow control. As the name indicates, an Inline Non Return Valve is able to be clamped in the centre of a Tri Clover union or RJT union. This creates a quick and simple way to access your valve by disassembling the union.

These valves are friction fitted with the assistance of two O-ring seals which allows the valve to sit securely in position. It also allows easy removal of the valve from the union, rather than welding a valve in for permanent use.

Mini Ball Valves are commonly used for domestic water services, heating & air-conditioning plants and compressed air systems. The slimline design and butterfly style handle are beneficial on smaller sized process lines or for saving space in condensed situations in comparison to standard 2pc or 3pc Ball Valves.

The Metal Company stock Mini Ball Valves with the full valve body, ball and stem in stainless steel grade 316, rather than a mix of stainless and nickel-plated or chrome-plated brass materials which are supplied elsewhere in the industry. The Mini Ball Valves have an EPDM O-ring seal that can process liquids from -40°C and up to 120°C.

Available with Female-Female, Male-Female or Male-Male BSP threaded ends and stocked in sizes 1/4″, 3/8″ and 1/2″ with a reduced port.

On the outside, the Gate Valve and Glove Valve look similar. Yet on the inside, they function completely different.

THE GATE VALVE
The Gate Valve is a unidirectional valve (flow can be either way) and houses a vertical ‘gate’ which determines the volume of flow passing through it. They are designed as an on-off function to isolate or connect fluid, but flow can be restricted or stopped completely by winding the handwheel at different levels.

THE GLOVE VALVE
The Globe Valve is a directional valve (one direction of flow) and consists of a movable disk-type plug that closes against a horizontal seat to regulate the flow passing through. Due to the horizontal seat configuration, the Globe Valve restricts the fluid flow significantly even when in fully open position in comparison to the Gate Valve.

Both valves are supplied by The Metal Company in stainless steel grade 316, have an aluminium handwheel, a maximum pressure of 1000PSI / 69Bar and are suitable for water, oil and gas (known as W.O.G.).

Some valves are ‘non-return’, which means the flow is directional (one direction of flow) and is able to stop the fluid from returning through the valve the opposite way.

Generally, the valve will have a gate with a hinge or spring which closes off the bore. When flow pressure is applied, the gate opens in the direction of flow.

Included in our BSP non-return valve range is the 2pc Spring Check Valve, 3pc Spring Check Valve, Swing Check Valve and Piston Check Valve.

Aside from BSP threaded valves, Sanitary Non Return Valves are available to suit dairy tube and union fittings.

The L Port Valve and T Port Valve are both known as 3-way valves due to their T-shape body with three ports. Both divert flow to and from different ports, however the L Port Valve allows one action whereas the T Port Valve facilitates another.

The L Port valve is commonly used to direct the flow from two separate sources in one direction. For example – When emptying tanks, once one tank is empty the fluid can be drawn from the next tank to the same line by turning the handle to change the source.

The T Port Valve is commonly used for directing the flow in two directions. Fluid is directed to more than one location simultaneously, passing directly through the valve body as well as to the side port at a slightly lower pressure.

Our L Port Valve and T Port Valve feature a lockable latch on the handle, and have a maximum temperature of 250c. Both are rated to 1,000PSI / 69Bar and are suitable for water, oil and gas (known as W.O.G.).

The range of flange types have been developed in various countries determined by the configuration and the pressure capabilities. The Metal Company stock the common flange types, including the following:

• Table E – ASME B16.5 – Tasman thickness
• PN 10 – BS 4504 – Tasman thickness
• PN 16 – BS 4504 – Tasman thickness
• ANSI 150 – ASME B16.5 – Tasman thickness

In this range you will find Tube Flanges, Pipe Flanges, BSP Threaded Flanges, Backup Flanges (also known as Backing Rings), Tube Neck Rings and Blind Flanges. Flanges are available in various sizes to suit imperial tube, schedule pipe and spiral welded tube.

The standard flange range features the following:

• Stainless steel grade 316
• Lightweight* (also known as Tasman thickness)
• Flat faced (FF)
• Slip on (SO)

Aside from the standard range, The Metal Company can source or manufacture most flange types within New Zealand or internationally. BSP threading and fabrication services are available for customisation to your requirements, including female BSP threaded flanges and custom flange drilling and welding to stainless steel fittings.

Typical industry applications include irrigation, pumping, petrochemical, geothermal, marine and food & beverage process lines.

*Although flanges are regarded as ‘Lightweight’, the flange thickness may not be light weight (thinner) than specified for some flange types.

The stainless steel Expansion Flange is technically not in the typical flange family. The purpose designed is to secure tube or piping in wall, floor and ceiling penetrations.

Commonly used in food or beverage plants, cool stores or any applications where a waterproof hygienic seal is required. The design allows for lineal expansion and contraction of pipework whilst preventing ingress or liquid to penetrate.

Flange sizes available can accommodate imperial, nominal bore, and metric tube sizes. Non-standard tube diameters can be adapted by adding a custom rubber liner.

What is the difference between a clamp and a saddle style clamp?

Clamps are stocked from sizes 1″(25.4) to 4″ (101.6) and sizes less than 1″ and more than 4″ are stocked as a saddle*.

Clamps are hinged to save space for pipe works in condensed situations, however they are replaced with a saddle in smaller sizes where the hinge becomes unfeasible and in larger sizes where the saddle provides a stronger solution

CLAMPS:

• 1x Bolt
• Hinged one side
• Can be separated
• Unique design

SADDLES:

• 2x Bolts
• Bolted either side
• Can be separated

*Parameters may differ depending on the tube the clamp is suited to. Some sizes are stocked in a heavy-duty option.

Bossed clamps are hinged to save space for pipe works in condensed situations, however they are replaced with a saddle in smaller sizes where the hinge becomes unfeasible and in larger sizes where the saddle provides a stronger solution.

Standard bossed clamps and bossed saddles feature a 10mm metric female threaded boss in the centre of one clamp half. The boss allows pipework to be secured from a machine, floor, wall or ceiling by threading 10mm Metric Threaded Rod to a Bossed Wall Plate.

For added strength, a 12mm Metric Boss can be welded to a Plain Clamp or Plain Saddle and 12mm Metric Threaded Rod used for securing in place.

For example:

Aside from bossed clamps and saddles, pipework can be connected with a Collar Clamp which allows a 5/8” or 16mm Round Bar to be fitted inside a collar or by welding Round Bar directly to a Plain Clamp.

TUBE

• Sanitary (AS 1528.1)
• Cold Rolled
• Measured by outside diameter (OD)

Tube is commonly used for a wide range of purposes including food & beverage process lines, irrigation, pumping, petrochemical, geothermal, marine, agriculture and machinery, automotive, architecture and heat exchange.

Sizing is based on the outside diameter (OD) and wall thickness (gauge) of the tubing.

SCHEDULE PIPE

• Non-sanitary
• Hot Rolled
• Measured by nominal bore (NB)

Pipe is commonly used for a wide range of purposes including, transporting fluids, gases, drainage & services, irrigation, pumping, petrochemical, geothermal, marine, agriculture and machinery.

The term NB (Nominal Bore) is often used interchangeably with NPS (Nominal Pipe Size). ‘Nominal’ is a non-dimensional number that identifies the hole diameter.

The wall thickness of pipe is determined by the schedule. In the engineering industry, this can also be written to as ‘SCH10’ or ‘S10’ for Schedule 10S and as ‘SCH40’ or ‘S40’ for Schedule 40S. To ensure correct supply, always specify at least 2 dimensions you require: Outside diameter, inside diameter, or wall thickness.

Got it?

Let’s recap:

Spiral welded tube is created using a process where a continuous full penetration MIG (metal inert gas) weld overlay is used to create tube in a spiral pattern. Typical industry applications include HVAC / refrigeration, geothermal, liquid transfer, waste water, irrigation and pumping.

Our spiral welded tube and fittings are manufactured to internal dimensions. This means sizing is based on the internal diameter and wall thickness (gauge) of the tubing. All our spiral welded stainless steel tube is manufactured from high quality coil conforming to ASTM: A240.

The Metal Company stock a range of fittings to suit spiral welded tube, including 45° & 90° bends, tees, concentric reducers, caps, saddle clamps and flanges & accessories.

Aside from the standard range, The Metal Company can source or manufacture various spiral welded tube and fittings within New Zealand or internationally. Options available on indent include spiral welded tube and fittings in stainless steel grade 316, spiral welded tube up to 8 metres in length and spiral welded tube and fittings in sizes up to 24”.

STAINLESS OUTSIDE DIAMETER (OD) TUBE

Sizing is based on the outside diameter and wall thickness (gauge) of the tubing. The standard stainless steel tube is measured by the outside diameter up to 6” size.

STAINLESS INSIDE DIAMETER (ID) TUBE

Sizing is based on the inside (or internal) diameter and wall thickness (gauge) of the tubing. The standard stainless steel spiral weld tube is measured by the inside diameter from 6” size onwards.

Our spiral welded tube and fittings are manufactured to internal dimensions.

Typical industry applications for the Press-Fit system include heating & cooling systems, water systems, compressed air & inert gas systems, closed circuit sprinkler systems and oil & diesel lines. Press-Fit can benefit installers through reliability, efficiency, quality, safety, labour saving and consistent workmanship.

RELIABILITY

The Press-Fit system is designed for use with M profile press jaws. Pressing tools have inbuilt safety features to ensure each press is the same every time, no uncertainty of weld integrity.

EFFICIENCY

The speed of the Press-Fit system will amaze you. A competent tradesman can install a Press Fit tube and fittings without the need of qualified welders.

QUALITY

The Press-Fit system uses metric size fittings and tube which is made to standard EN10217-7 and EN10312. The stainless steel grade 316L (low carbon) is used for Press-Fit products, which means it is highly corrosion resistant and suitable for nearly all environments.

The Press-Fit system can be used for potable water when using grade 316L stainless steel. This certifies the product complies with the plumbing code and the relevant standards.

The standard O-rings seals, made of black EPDM, are resistant to ageing, heat and chemicals.

SAFETY

• No naked flame
• No hot work permits
• No gas bottles
• No fire hazards
• No heavy installation equipment
• Makes it easier to comply with requirements

LABOUR SAVING

Fewer less installation hours on site. Up to 50% reduced labour costs and lower skilled tradesman required to carry out the installation.

CONSISTENCY

Every connection is uniform throughout the installation, ensuring good connection quality and no worrying about reworking of installations due to inconsistency.

The Metal Company stock a range of metric tube sizes and Press-Fit fittings to suit, including 45° & 90° Elbows and Spiggots, Adapters (to suit BSP, RJT & Tri Clover fittings), Couplers, Reducing Fittings, Tees, Clamps, Mac Unions and Weld Joints.

Other fittings and sizes are available on indent.

The Press-Fit system uses metric size fittings and tube which is made to standard EN10217-7 and EN10312. The stainless steel grade 316L (low carbon) is used for Press-Fit products which means it is highly corrosion resistant.

The Press-Fit system can be used for potable water when using stainless steel grade 316L. This certifies that the product complies with the plumbing code and the relevant standards.

GENERAL APPLICATION

The stainless steel system is the ideal solution for drinking water systems as the 316L stainless steel used is completely hygienic and highly corrosion resistant. For general applications, the standard O-rings made of black EPDM rubber which are resistant to ageing, heat and chemical additives and are particularly suitable for all types of treated water.

The reliable, high-quality components are suitable for heating, cooling, compressed air, oil and diesel lines in the civil, industrial and manufacturing sectors.

Pressure & Temperature Rating:

• Maximum operating pressure: 230PSI / 16Bar
• Operating temperature: -20°C +95°C
• Maximum temperature: 120°C on approved applications.
• Up to 580PSI / 40Bar available on approved applications.

GAS APPLICATION

The stainless steel Press-Fit system is used in Australia, New Zealand and many European countries for gas distribution systems, with external above-ground pipes, installed inside or outside buildings. It can be used for all types of combustible gas, both natural and liquid.

For gas applications, the O-ring gaskets are made of yellow HNBR which is compatible with common gas varieties used and are resistant to ageing and heat.

Pressure & Temperature Rating:

• Maximum operating pressure: 70PSI / 5Bar
• Operating temperature: -20°C +70°C

The standard O-rings, made of black EPDM rubber, are used for general applications. They are resistant to ageing, heat and chemical additives.

BLACK EPDM O-RING SEAL

The black EPDM rubber seal is standard for stainless steel and carbon steel systems. EPDM is suitable for temperatures between -20 and +120 °C and for pressures up to a maximum of 230PSI / 16Bar. It has a host of applications and is used for drinking water, heating, cooling, steam, firefighting, compressed air (oil-free) and inert gas systems.

YELLOW HNBR O-RING SEAL

The yellow HNBR rubber seal is used in gas systems. It is suitable for temperatures between -20 and +70 °C and for pressures up to a maximum of 70PSI / 5Bar.

BSP stands for British Standard Pipe, yet the thread has been adopted internationally. BSP threaded fittings are used in UK, Europe, Asia, South Africa and Australia. The fittings are one of the most used in New Zealand and are found in a variety of metals across many industries.

Common applications for stainless steel BSP fittings include food & beverage, pumping, petrochemical, marine, geothermal, agriculture and machinery.

The Metal Company stock a full range of BSP threaded fittings, including elbows, tees, hosetails, bushes, reducing connectors, sockets, nipples, plugs, caps and Mac Unions.

The Mac Union, also known as a BSP union or simply as a threaded union, is mostly used to access BSP threaded pipework.

The union features a flat face with a flat seal positioned at the connection point. To prevent leakage, the pipework must be straight to ensure both faces of the union align.

In comparison to brass and other materials used in the industry, The Metal Company supply investment cast Mac Unions manufactured from stainless steel grade 316 which is suitable for all environments including marine applications. Like our other BSP threaded fittings, the maximum pressure for Mac Unions is 150 lbs.

Mac Unions are made up of three parts; the Female-Male Union Part, Female-Female Mac Union Part and O-ring seal. These are supplied as one unit with an EPDM seal included and replacement seals are available separately in EPDM and Teflon (PTFE).

The EPDM seal has a maximum temperature of 120°C and is suitable for hot water, steam, alcohols or coolants. It is not resistant to mineral oils, greases and fuels. However, the Teflon seal has a maximum temperature of 250°C and is suitable for chemical resistance.

The Metal Company stock aluminium in a range of products including round tube, square tube, rectangle tube, angle, flat bar, round bar, channel, sheet and plates.

ALUMINIUM TUBE & EXTRUSIONS

Aluminium tube and extrusions are typically grade 6060 with temper T5. This medium-strength general purpose aluminium has very good corrosion resistance and weldability.

ALUMINIUM SHEET & PLATE

Aluminium Sheet and Plate is available in two options, grade 5052 and grade 5083 and aluminium Tread Plate is available in grade 5052.

Aluminium 5052 is a general purpose grade and is used for indoor and outdoor environments. Aluminium grade 5083 is generally known as marine grade and is resistant to industrial chemicals and salt water.

Aluminium Propeller Plate is available in grade 3003. This grade is a medium-strength general purpose aluminium with good workability and resistance to corrosion.

ALUMINIUM FREE MACHINING

Aluminium Free Machining bar is a Supercut20 grade. This high-strength aluminium-copper alloy is designed for machining and is not suitable for welding.

All standard* flanges stocked by The Metal Company are Tasman Thickness (also referred to as Light Weight). In many cases, a full thickness flange is not required on low-pressure pipework and thin-wall tube installations.

Tasman Thickness is an Australian/New Zealand norm for flange thickness. It specifies a thinner, lightweight flange than the standard thickness, which is especially noticeable for larger sized flanges. The thickness is constant across a number of flange sizes and increases more gradually in comparison to the full thicknesses. Although flanges are regarded as ‘Lightweight’, the flange thickness may, in fact, be thicker and heavier for smaller sized flanges.

Please note: *May not apply to BSP Threaded Flanges, which feature a raised face.

Maximum Seal Temperature: +70°C

Insertion rubber is manufactured with cotton reinforcement to assist tensile strength and resistant to splitting. This is a general-purpose rubber and can withstand a low temperature range.

The Metal Company use black insertion rubber for standard flange gaskets.

Maximum Seal Temperature: +70°C

Other titles: Highly Saturated Nitrile, Halogenated Acrylonitrile Butadiene, trade names include Zeptol, Therban or Zhanber.

Hydrogenated Nitrile Butadiene Rubber (HNBR) is resistant to abrasion and retains properties when exposed to heat, oil, gas or steam. In some situations, HNBR rubber can withstand up to 140°C temperatures for a short period of time.

Yellow HNBR rubber is used for seals on press-fit fittings to suit gas systems. It is suitable for temperatures between -20°C and +70°C, and for pressures up to a maximum of 70PSI / 5Bar.

Maximum Seal Temperature: +100-120°C

Other Titles: Buna-N, Perbunan, Acrylonitrile Butadiene Rubber or Nitrile-Butadiene Rubber (NBR).

Nitrile (NBR) is a synthetic rubber which is suitable for oils, hydrocarbon fuels, hydraulic fluids, fats and flame retardant liquids.

The Metal Company use white nitrile rubber for food grade quality (FQ) flange gaskets. Blue nitrile rubber is used for standard RJT stepped seals with a maximum temperature of 100°C and DIN O-ring seals with a maximum temperature of 120°C. Black nitrile rubber is used for camlock gaskets. Nitrile is also used for black seals on Table E Lugged Butterfly Valves, with a maximum temperature of 120°C.

Maximum Seal Temperature: +120°C

Other Titles: Ethylene Propylene Diene Monomer

Ethylene Propylene Diene Monomer (EPDM) is a long-lasting synthetic rubber which is suitable for hot water, steam, alcohols, coolants, acids and bases. It is not resistant to mineral oils, greases or fuels. EPDM seals are used for flexibility, good insulation properties and the general temperature range of -20°C and +120°C.

The Metal Company use black EPDM rubber for standard seals on stainless steel and carbon steel Press-Fit fittings, standard seals for BSP threaded Mac Unions and standard seals for Tri Clover unions. Green EPDM Rubber is used as chemical-resistant seals for RJT stepped seals. EPDM is used for a range of valve seals including Mini Ball Valves, Sanitary Non-Return Valves, E Series Butterfly Valves, Sanitary Ball Valves and Inline Non-Return Valves.

Maximum Seal Temperature: +150°C

Other Titles: Ethylene Propylene Rubber

Ethylene Propylene Rubber (EPR) is a synthetic rubber closely related to EPDM rubber and is suitable for heat, water, steam, alkali, mild acidic and UV exposure.

The Metal Company use Black EPR rubber for standard RJT O-ring seals.

Maximum Seal Temperature: +180°C

Silicone is an elastomer with exceptionally high performance and good resistance to temperature fluctuations, fungal growth and UV exposure.

The Metal Company use white silicone for valve seals on A Series Butterfly Valves and Sampling Diaphragm Valves.

Maximum Seal Temperature: +230°C

Other Titles: Fluoroelastomer (FKM)

Viton is a synthetic rubber suitable for higher temperatures and restricting permeation of chemicals.

The Metal Company use grey Viton rubber for Tri Clover seals that require high-temperature and chemical resistance.

Stainless steel is a ferrous metal as it contains iron.

Ferrous metals mostly contain Iron. They have small amounts of other metals or elements added, to give the required properties.  Ferrous metals are magnetic and give little resistance to corrosion.

Non-ferrous metals are specified for structural applications requiring reduced weight, higher strength, non-magnetic properties, higher melting points, or resistance to chemical and atmospheric corrosion. They are also specified for electrical and electronic applications.

Aluminium is a non-ferrous metal as it does not contain iron.

Ferrous metals mostly contain Iron. They have small amounts of other metals or elements added, to give the required properties. Ferrous metals are magnetic and give little resistance to corrosion.

Non-ferrous metals are specified for structural applications requiring reduced weight, higher strength, non-magnetic properties, higher melting points, or resistance to chemical and atmospheric corrosion. They are also specified for electrical and electronic applications.

Yes, stainless steel and aluminium metals will react when wet, creating a red oxide, especially when salt is present.

The metal with the lower oxidation potential will corrode; in this case, the aluminium.

Stainless steel does not “rust” as you think of regular steel rusting with a red oxide on the surface that flakes off. Corrosion is generally caused by contaminants settling on the surface of the stainless steel.

For example, stainless steel and aluminium metals will react when wet, creating a red oxide, especially when salt is present. The metal with the lower oxidation potential will corrode; in this case, the aluminium.

Stainless steel has excellent properties at both extremes of the temperature scale. Some stainless steel can be used down to liquid nitrogen temperatures and some up to about 1800° F.

Some stainless steel components have a maximum working temperature; however, most lengths and general sanitary stainless steel fittings are not temperature rated.

Stainless steel is easily welded, but the welding procedure is different than that used with carbon steel. The “filler” rod or electrode must be stainless steel.

We have nominated welders able to create customised fittings, providing you with a quick and easy installation on site.

Yes and no.

There are several types of stainless steel. The 300 series (which contains nickel) is not magnetic. The 400 series (which just contains chromium and no nickel) is magnetic.

Stainless steel is the generic name for a number of different steels used primarily because of their corrosion resistance. All stainless steels share a minimum percentage of 10.5% chromium. It is this element that reacts with the oxygen in the air to form a complex chrome-oxide surface layer that is invisible but strong enough to prevent further oxygen from staining (rusting) the surface.

The layer itself is extremely thin is described as passive (does not react or influence other materials), tenacious (clings to the layer of steel and is not transferred elsewhere) and self-renewing (if damaged, more chromium from the steel will be exposed to the air and form more chromium oxide).

This means that over a period of years a stainless-steel knife can literally be worn away by daily use and will remain stainless. Higher levels of chromium and the addition of other alloying elements such as nickel and molybdenum enhance this surface layer and improve the corrosion resistance of the stainless material.

Sight glasses are part of our Process Equipment range that has been developed to provide better access to specialist process equipment that is commonly used across New Zealand in the food and beverage industries.

The Metal Company offers the Sight Glass with tube, Tri Clover ferrules and RJT male-female connections. These are of exceptional quality and can withstand up to 500PSI / 34Bar working pressure.

The actual ‘glass’ tube is made of polycarbonate which can withstand temperatures up to 140°C; however, borosilicate glass tubes are also available for withstanding higher temperatures up to 230°C. The standard seals holding the glass in place are made of the PTFE rubber and kits are available for replacing seals that have worn over time.

The ½” ball lock plugs are used for gas applications, and are available with a BSP nipple (male thread) or BSP socket (female thread) connection. Also offering a ball lock socket, or female Gas Fitting, with a barbed hosetail in three different sizes 6mm, 10mm and 12mm.

The Metal Company Gas Fittings have a stainless steel body and the hosetail Gas Fitting has a chrome brass exterior. Most commonly used for gas applications, the fittings have a maximum temperature of 130°C and a maximum pressure of 215PSI / 15Bar.

The Liquid Level Gauge is made up of two parts, known as the ‘Upper’ and ‘Lower’ fitting which is used with 19.05mm polycarbonate or borosilicate glass tube.

This tube is friction fitted between the two fittings into a silicone seal at the outlets, allowing fluid to flow up to a maximum temperature of 180°C. Each unit has a stainless steel retaining nut that acts as handwheel to gauge the flow through the tube and a 25.4-38.1m Tri Clover connection to let the liquid enter and exit.

As the name suggests, liquid levels of tanks or barrels can be gauged by positioning the Upper Gauge at the top of the tank and the Lower Gauge near the bottom, allowing an external view of the liquid level within.

The individual gauges are able to withstand a maximum pressure of 145PSI (10Bar); however, this may be less depending on the glass tube handling pressure.

The Metal Company stock cast iron Lugged Butterfly Valves with a Table E threaded stud pattern in sizes 2½” to 10″. These have a pull-and-turn lockable lever handle with a 10 position notch plate to vary the flow.

The valve has a 230PSI (16Bar) maximum nominal pressure rating and houses the stainless steel disc in a EPDM seal with a temperature rating of 120°C. The seal allows the valve to be suitable for oils, hydrocarbon fuels, hydraulic fluids, fats and flame retardant liquids.

Also available is a gearbox to suit the cast iron Lugged Butterfly Valve. The gearbox is an alternative to the lever handle and notch plate, which allows the valve to be altered easily by a hand wheel.

Click here to view Table E Lugged Butterfly Valves online

In the world of engineering and construction, the acronyms RHS, SHS and CHS are often used.  This is most common in the United Kingdom and associated countries, including Australia and New Zealand.

The term RHS stands for Rectangular Hollow Section. RHS is the most prevalent term and is generally accepted for describing square hollow section as well, which is technically incorrect.

The correct term for square tube is SHS which stands for Square Hollow Section. Less known is the term CHS, this stands for Circular Hollow Section.

These terms are widely used to describe mild steel; however, they can also be translated for stainless steel and aluminium engineering and construction by engineers who are familiar with the terminology.

Summary:

• RHS: Rectangle Hollow Section
• SHS: Square Hollow Section
• CHS: Circular Hollow Section

Other common terms include Box Section, Extrusion and Profile. Box Section can refer to either rectangle tube or square tube. Extrusion and Profile are terms that can be used in place of ‘Section’; however, this is more applicable to material which has been particularly configured or shaped rather than rectangle, square or circular hollow tube.

The Metal Company stock a full range of SHS, RHS & CHS in 304 & 316 Stainless Steel.

A stainless steel Heavy Duty Hose Clamp is often referred to as a Mikalor Clamp. The name Mikalor comes from the well-known international manufacturing brand.

Mikalor is widely associated with stainless steel hose clamps and is even used for referring to other stainless steel clamps offered in the market.

The Heavy Duty Hose Clamps at The Metal Company are fully stainless steel grade 304, including the stainless steel hex bolt (W4). The Hose Clamps are manufactured to a quality standard and offer a high crush strength.

Check out our range of sizes here: https://www.themetalcompany.co.nz/products/heavy-duty-hose-clamp/

NPT stands for National Pipe Thread and originates from United States. It’s a family of technical standards for screw threads to connect pipes and fittings, it is considered the American alternative to the original BSP thread from Britain.

The thread has been adopted by United States and some associated countries.  NPT is largely used in New Zealand when important turn-key systems, pumps or fittings are used which has existing NPT threads. This has increased in recent years.  Common applications for stainless steel NPT fittings in New Zealand include gas lines, food & beverage processing, pumping and machinery.

In contrast the BSP thread is used in UK, Europe, Asia, South Africa and Australia. BSP threaded fittings are one of the most used in New Zealand and are found in a variety of metals across many industries.

All our NPT threaded fittings are made to standard. We ensure products meet Manufacturing Standard Din 2999 and ISO 228/1. The NPT range is made from Stainless Steel Grade 316. This is a marine grade, which means it can be exposed to salt water or harsh outdoor conditions. The standard Pressure Rating for NPT fittings is 150lbs (1000kpa).

We stock NPT Sockets, Nipples and Adapters in different sizes. Click here to view out NPT Threaded Fittings range.

Both are ferrous metals and made mostly from iron therefore look almost identical in appearance. Cast Iron is an iron casting with carbon content higher than 2%. Cast Steel is a steel casting with carbon content lower than 2%. Cast Iron has better corrosion resistance than steel. Cast iron is relatively easy to cast, as it pours easily and doesn’t shrink as much as steel. The higher grades of grey cast iron can withstand greater load and a degree of tightness or corrosion resistance. Click here to Cast Your Iron The Metal Company’s Cast Iron Valves

See above for the Butterfly Valve Symbol and diagram which shows an open and closed Butterfly Valve.

The disc positioned in the center rotates either parallel or perpendicular to the flow and allows a quick shut-off. When the valve is fully closed the disc is turned perpendicular so it completely blocks off the passageway. When the valve of a Butterfly Valve is fully open it is rotated a quarter turn and is parallel with the flow. The disc is commonly referred to as the Butterfly which is mounted on a rod. The movement of the rod with the disc will depend on whether the valve is open or closed. Click here to see a range of our Valves including Butterfly Valves.

Types of Butterfly Valve body styles include Lugged Butterfly Valve and Wafer Butterfly Valves.

Wafer Type Butterfly Valve:

The Wafer type Butterfly Valve is placed between pipe flanges, and the flange bolts surround the valve body. The Wafer Type Butterfly Valve is suitable for most flanges (including Table E, PN16 and Ansi150). The entire line must be shut down if either side of this valve needs maintenance worked on.

Click here to view Wafer Type Butterfly Valve

Lugged Butterfly Valve:

Click here to view Lugged Butterfly Valve

The Lugged Butterfly Valve has threaded lugs on the periphery of the valve body to provide passages for bolt holes that match with those in the flanges. This design enables the disconnection of one side of the line without affecting the other. The Butterfly Valve is classified as a quarter-turn valve, it does work like a ball valve for quick shutoff, however it can open and close incrementally unlike a ball valve.

Above is the type of valves that define a Butterfly Valve however to view other types of Valves that The Metal Company has click here

To identify BSP Threads or otherwise known as British Standard Pipe they come in two different variants

• Parallel which is a female thread
• Tapered which is a male thread

Both BSP thread variants have the same pitch, angle and shape (rounded peaks and valleys). The BSP thread size can be determined by the outside diameter (male thread) or inside diameter (female thread) and thread pitch. The pitch is the distance from the crest of one thread to the next. Once you have the thread size you can then determine the number of threads per inch to verify that it is a BSP fitting. This can be done by counting the number of thread crests over a 1.4″ length and then multiply by 4 to get the number of threads per inch. Head to this page to view the chart to find your desired size and its relative specifications.

Tri Clover Unions and Tri Clamp Unions are compatible with each other and can be used interchangeably. The only difference is one is a brand name while the other is a generic term.

To view our Tri Clover Unions and Fittings, click here https://www.themetalcompany.co.nz/?s=tri+clover

Ferrules are used to connect the sanitary process lines to the union. The Metal Company has both Expansion or otherwise known as Slip On Ferrules and Butt Weld Ferrules. Tri Clover Expansion Ferrules have ridges on the inside and slip over the tube and require just one weld to create a hygienic join. While Butt Weld Ferrules are typically purge welded for hygienic applications.

Check out this informative page with a great overview of Tri Clover Unions explaining their components and fittings which you can choose from to suit your needs https://www.themetalcompany.co.nz/unions-part-2-tri-clover/

SPI stands for Squares Per Inch and is measurement D for Stainless Woven Wire Mesh and the samples.

Press Fit System Installation

Europress Press Fit System installation allows an ideal solution for creating pipework and tubing in compact spaces.
This is due to no need for welding on site resulting in reduction of on site costs and labour.
Below you will see a step by step guide for sizes 15, 22, 28 & 35:

Cut the pipe using burr free approved cutters. Do
not use oxyacetylene or abrasive cut off wheels.
Pipes must be cut at right angles to their axis, using
a pipe cutter or finetooth saw, taking into account
the depth of insertion into the fitting.

All pipe cuts must be carefully deburred, both inside
and outside, using a manual or electric deburring
tool. Any cutting residue (swarf) must be removed
to preclude damage to the O-ring when the pipe is
inserted into the fitting, avoiding possible leaks.

To ensure a correctly inserted joint the pipe must
be marked with a fine-point felt-tip pen where it
meets the fitting using the Europress depth gauge
so that full insertion can be verified.

Before assembling the fittings, the positioning
of the O-rings must be checked and, if necessary,
lubricate O-ring with water or talc to ease the
insertion of the pipe. Never use oils, greases, glues
or other similar substances. The pipe is inserted in
the fitting with a slight rotating motion until it hits
the stop.
Check pipe is fully inserted to witness mark.

The pressing tools must be equipped with
M-shaped profile jaw attachments or pressing jaw
corresponding to the diameter of the fitting to be
pressed. Retract the lock pin, position the jaws
into the tool head and ensure the lock pin is fully
engaged.

Open the jaws by squeezing the two ends
together, then position jaws over the fitting
so that the internal channel of the jaws form a
perfect fit round the toroidal seat of the fitting.
Release the jaws and check for a snug fit.

Initiate the press cycle by squeezing the trigger
#1 in image below – hold until press cycle is
completed. Do not allow interruption to the press
cycle. If the LED light #2 in image below comes
on or warning beep sounds, the joint is NOT approved.
If the hydraulic ram stops mid-cycle the automatic reset
function can be manually overridden by depressing the
reset button #3 in image below. Check L.E.D. light
after each press. If it comes on, battery must
be recharged or changed before attempting the
next press, see trouble-shooting guide.

Europress Press Fit System installation allows an ideal solution for creating pipework and tubing in compact spaces.
This is due to no need for welding on site resulting in reduction of on site costs and labour.

Below you will see a step by step guide for sizes 42, 54, 76.1, 88.9 & 108:

Cut the pipe using burr free approved cutters. Do
not use oxyacetylene or abrasive cut off wheels.
Pipes must be cut at right angles to their axis, using
a pipe cutter or fine tooth saw, taking into account
the depth of insertion into the fitting.

All pipe cuts must be carefully deburred, both inside
and outside, using a manual or electric deburring
tool. Any cutting residue (swarf) must be removed
to preclude damage to the O-ring when the pipe is
inserted into the fitting, avoiding possible leaks.

To ensure a correctly inserted joint the pipe must
be marked with a fine-point felt-tip pen where it
meets the fitting.

42 and 54 use the Europress depth gauge.

Large sizes use ruler:
76.1 mark at 55mm
88.9 mark at 63mm
108 mark at 78mm
140 mark at 97mm
169 mark at 117mm

Before assembling the fittings, the positioning
of the O-rings must be checked and, if necessary,
lubricate O-ring with water or talc to ease the
insertion of the pipe. Never use oils, greases, glues
or other similar substances. The pipe is inserted in
the fitting with a slight rotating motion until it hits
the stop.
Check pipe is fully inserted to witness mark.

The pressing collar must be M-shaped profile
corresponding to the diameter of the fitting to
be pressed. Retract the lock pin, open the jaws
and position the jaws around the fitting.

Ensure that the internal channel of the jaws
form a perfect fit around the O-ring seat of the
fitting. Ensure the lock pin is fully engaged.

Squeeze the back of the adapter arms
together and hook onto the pressing collar.

Retract the lock pin, engage the adaptor
and make sure lock pin is fully engaged.
Check witness mark for insertion and depth
alignment before initialising press cycle.

Initiate the press cycle by squeezing the trigger
hold until press cycle is completed. Do not allow
interruption to the press cycle. If the LED light comes
on or warning beep sounds, the joint is NOT approved.
If the hydraulic ram stops mid-cycle the automatic
reset function can be manually over-ridden by depressing
the reset button. Any tool malfunction, check with the TMC
crew. Do not continue using tool without approval.

Click here to check out our Europress products

Europress design and installation is guaranteed the longevity of 25 years and the pressfit tightness guarantee is in excess of 30 years. This is of course coupled with strict adherence to the technical and manufacturers instructions. Ensuring long lasting seal with no leakage and a promise of high standard quality. However if there is any sort of leakage, take a look at potential reasons that may be causing a leak:

1. Tube inserted into the fitting could be creased or damaged.
2. Tube not pushed fully home in the fitting.
3. Non-standard connection between tubes or non-matched sizes.
4. Incorrect installation fixing.
5. Connection made to the fitting by the operator using incompatible products.
6. Installations subject to mechanical stress, e.g. mountings not properly lined up.
7. Other objects anchored to the hanging system.
8. Thermal expansion not compensated for by adequate fitting techniques or equipment.
9. Freezing of the installation.
10. Pressure or temperature specifications outside those indicated in the conditions of use.
11. Unforeseen external causes such as accidental impacts
12. Fittings welded by the operator rather than pressed.
13. Double pressing by the operator either of the fitting itself or near it.
14. Minimum distance between two fittings not observed.
15. Poor storage and handling of the fittings with deterioration of the o-ring, caused by external agents such as light, temperature, dirt, ozone etc.
16. Mechanical damage to the fitting (cuts, bending, crushing).
17. Replacement of washers or spare parts not supplied by Europress.
18. Tearing of the o-ring, for example caused by pipes not properly deburred.
19. Incorrect tube insertion causing the o-ring to become dislodged from its position.
20. Use of unsuitable o-ring lubricants. Use only soap and water.
21. Internal or external liquids not compatible with the o-ring composition.
22. Pressing carried out with worn clamp jaws.
23. Use of a pressing tool no longer capable of exerting sufficient force (the result of wear and tear, operator error or lack of maintenance).
24. Clamp jaws not correctly positioned in relation to the fitting when pressed.
25. Clamp jaws not fully pressed home.
26. Use of non-standard clamp jaws or jaws made for other section types.

Thermal Expansion Calculation

Tube expands as a function of the materials they are made of and the temperature variation to which they are subjected. Therefore, when installing pipework systems three rules must be followed to ensure good results:

• leave sufficient room for expansion
• use expansion compensators
• position both fixed and sliding collars correctly

The following formula is used to calculate longitudinal expansion:
Δ L = • L • ΔT ÷ 1000 where:

• Δ L is the expansion in mm.
• is the coefficient of expansion of the material expressed in mm/m• °C
  Coefficient of thermal expansion
  Stainless Steel 16.5, Carbon Steel 11
• L is the length of the pipe in m.
• ΔT is the permitted temperature difference

For a practical calculation of the thermal expansion, according
to the tube length and the temperature variation, see
the graph in fig. 4, which applies to stainless steel and is also
applicable to carbon steel, but allowing for the fact that the
thermal expansion of carbon steel is reduced by 1/3 (-33%).
Example: The thermal expansion of a 20-metre stainless steel
tube, subjected to a temperature variation of
70°C is the following:

ΔL= 16.5 x 20 x 70/1000=23.1 mm

The same result can also be obtained from the graph in fig. 4
If the tube is carbon steel, the expansion is:
ΔL= 11 x 20 x 70/1000= 15.4 mm

The same result can also be obtained from the graph in fig 4,
but reduce the expansion for stainless steel by 1/3 (-7.7mm).