Piping Standards & Material Specifications
A plain-language reference to the ASME dimensional standards and ASTM material specifications most often quoted on pipe fitting, flange, forged fitting and steel pipe enquiries. Use it to frame your specification, then send the details for a quotation.
Dimensional standard
ASME B16.5
Pipe Flanges and Flanged Fittings (NPS 1/2 through NPS 24)
ASME B16.5 is the dimensional standard most commonly referenced for pipe flanges and flanged fittings in sizes NPS 1/2 to NPS 24. It defines flange types, pressure classes, facings, bolting patterns and marking requirements.
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ASME B16.9
Factory-Made Wrought Buttwelding Fittings
ASME B16.9 covers dimensions, tolerances and marking for factory-made wrought buttwelding fittings such as elbows, tees, reducers, caps and stub ends.
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ASME B16.11
Forged Fittings, Socket-Welding and Threaded
ASME B16.11 covers forged socket weld and threaded fittings used mainly on small-bore piping, with pressure classes expressed as 2000, 3000, 6000 and 9000.
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ASME B16.47
Large Diameter Steel Flanges (NPS 26 through NPS 60)
ASME B16.47 defines large diameter steel flanges above the range of B16.5, in two dimensional series: Series A (formerly MSS SP-44) and Series B (formerly API 605).
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ASME B36.10M / B36.19M
Welded and Seamless Wrought Steel Pipe Dimensions
ASME B36.10M gives standardised outside diameters and wall thickness schedules for carbon and alloy steel pipe; B36.19M covers stainless steel pipe with the S-suffix schedules.
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ASTM A105
Carbon Steel Forgings for Piping Applications
ASTM A105 covers forged carbon steel piping components — flanges, fittings, valves and similar parts — for ambient and higher-temperature service in pressure systems.
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ASTM A234 WPB
Wrought Carbon Steel Buttwelding Fittings
ASTM A234 covers wrought carbon and alloy steel fittings for moderate and elevated temperature service. Grade WPB is the widely used carbon steel grade for buttweld fittings.
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ASTM A106 / ASTM A53
Carbon Steel Pipe for Pressure and General Service
ASTM A106 covers seamless carbon steel pipe for high-temperature service; ASTM A53 covers welded and seamless pipe for general and mechanical service, including galvanised pipe.
Read referenceThis reference is provided for general guidance. Always work from the current published edition of the relevant standard and your project specification. Sizes, grades, classes and documentation for any supply are confirmed at the enquiry stage.