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Pipe Specifications

Common ASTM and API material specifications for oil & gas and process steel pipes

Carbon Steel Pipe A53/A106 Gr. B, A333 Gr. 6

Learn about the 3 most common specifications for carbon pipes: ASTM A53 (black and galvanized steel pipes, seamless and welded), ASTM A106 (seamless CS tubular for high pressure and high-temperature applications up to 750 degrees F), and ASTM A333 (low-temperature service). The article gives you an overview of these three specifications in terms of typical uses,… read more »

Line Pipe API 5L Gr. B to X80 (PSL1/2)

With this article, you learn about API 5L pipes. The API 5L specification covers seamless and welded pipes to convey oil, gas, water in the natural oil & gas and petrochemical industries. API 5L line pipes are available in multiple carbon steel grades, designated as Grade B, X42, X46, X52, X56, X60, X70, X80 and in PSL1 or PSL2… read more »

Alloy Steel Pipe A335 Gr. P5, P9, P11, P22, P91

Learn about the alloy steel pipes specification ASTM A335 that covers “chrome-moly” seamless pipes with remarkable resistance to corrosion and good tensile strength at high-temperature service. Generally, ASTM A335 P11, P22, and P91 pipes are used in power generation and in downstream oil and gas, P5 and P9 grades are for refinery applications. ALLOY PIPE A335… read more »

Stainless Steel and Duplex Pipe (ASTM A312, A790)

The ASTM A312 specification covers seamless and welded austenitic stainless steel pipes used for high temperature and/or corrosive service (the most common grades are 304/304L and 316/316L). The A790 specification covers seamless duplex and super duplex pipes UNS S32205/31803 and UNS S32750/32760 (special SS grade with a mixed ferritic/austenitic microstructure). In this article, we illustrate the… read more »

ASTM vs. EN Pipe Specifications

An overview of the most common ASTM and EN/DIN pipe specifications, material grades within each specification, and, when possible, the equivalent grades between ASTM vs. EN pipe grades. CARBON STEEL PIPES Application Pipe Specifications Material Grades High-temperature Carbon Steel EN 10225 S355G15, S460G6 BS 7191 355EM API 5L Grade B, X42, X52, X56, X60, X65,… read more »

3LPE Coated, Lined and Clad Pipes (CRA)

What is the difference between external pipe coating and internal pipe-lining and cladding? External pipe coatings are used to protect the metal from corrosive environments (3LPE coated pipes are the most common choice). Internal lining (example PTFE) protects the pipe from corrosive fluids. Clad pipes (CRA) have the inner surface covered by higher grade materials to… read more »

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