Instrument Tubing and Fittings Standards
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Instrument Tubing Standards
ASTM is the most common standard for the specification of tubing. It is recommended ASTM standards are obtained and read to ensure that your selection is correct. Otherwise, contact your local supplier.
Each type of tube has different standards as follows:
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ALLOY 20 |
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ASTM B468 |
Seamless and Welded Chromium Nickel Iron Molybdenum Copper Columbium Stabilised Alloy. |
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ALUMINIUM TUBING |
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ASTM B210 |
Aluminum Seamless tubing |
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CARBON STEEL TUBING |
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ASTM A161 |
Seamless Low Carbon and Carbon Molybdenum steel for refinery service. |
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ASTM A179 |
Seamless cold drawn low carbon steel heat exchanger and condenser tubes. |
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COPPER TUBING |
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ASTM B68 |
Seamless Copper Tube - bright annealed - as used where tube is required to be dirt free, applications such as refrigeration. |
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ASTM B75 |
Seamless Copper Tube- Utilised for general-purpose applications. |
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ASTM B88 |
Seamless Copper Water Tube - Utilised for plumbing applications. |
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ASTM B251 |
General requirements - Covers the requirements of ASTM copper tubing standards. |
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HASTELLOY TUBING |
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Seamless Nickel Alloy Pipe and Tube |
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INCONEL TUBING |
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ASTM- B167 |
Nickel Chromium Iron alloy |
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MONEL TUBING |
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ASTM B165 |
Nickel Copper Alloy seamless tubing - Commonly used on seawater service. |
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STAINLESS STEEL TUBING |
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ASTM 213 |
Seamless Ferric and Austentic Alloy Steel Boiler, Superheated and Heat Exchanger Tubes - General Service. |
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ASTM A249 |
Welded Austenitic Steel Boiler, Superheater, Heat Exchanger and Condenser Tubes - General and High Temperature Service. |
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ASTM 269 |
Seamless and welded Austenitic Stainless Steel Tubing for General Service. |
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ASTM A450 |
General requirements |
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ASTM A632 |
Seamless and welded Austenitic Small Diameter Stainless Tubing - Suitable for general service. |
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TITANIUM TUBING |
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ASTM B338 |
Seamless and welded titanium and titanium alloy tubes for condensers and heat exchangers. |
Instrument Fitting Standards
National Pipe thread tapered and ISO parallel threads are commonly used in industry.
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ANSI B1.20 |
National Pipe Tapered (NPT) standard for Tapered threads |
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ANSI B1.20.3 |
National Pipe Tapered Dryseal |
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ISO 7/1 |
Tapered Pipe threads |
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ISO 228/1 |
Parallel Pipe threads |
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ISO 262 |
Metric Screw threads |
Other Instrument Tubing Standards
ISO 2186:2007 - Fluid flow in closed conduits - Connections for pressure signal transmissions between primary and secondary elements - This standard sets out provisions for the design, lay-out and installation of a pressure signal transmission system, whereby a pressure signal from a primary fluid flow device can be transmitted by known techniques to a secondary device safely and in such a way that the value of the signal is not distorted or modified.
ISA-67.02.01-1999 Nuclear Safety-Related Instrument Sensing Line Piping and Tubing Standard for Use in Nuclear Power Plants - This Standard covers design, protection, and installation of nuclear safety-related instrument-sensing lines and sampling lines for nuclear power plants. The Standard covers the pressure boundary requirements for sensing lines up to and including one inch (25.4 mm) outside diameter or three-quarter inch nominal pipe (19 mm). The boundaries of this Standard for instrument-sensing lines span from the root valve/piping class change, up to but not including, the manufacturer-supplied instrument connection. The boundaries of this Standard for sampling lines span from the process tap to the upstream side of the sample panel, bulkhead fitting, or analyzer shutoff valve, and include in-line sample probes.