API specifications are published by the American Petroleum Institute (API). These specifications are designed to help standardize the materials and equipment involved. API standards are updated regularly; therefore, it is important to refer to the most up-to-date specifications.
API 2B is a specification for welded steel-plate applied when building offshore drilling platforms.
API 5CT is a standard specification for the manufacturing processes, property requirements, testing methods, and required dimensions for seamless and welded steel casing and tubing. This standard is applicable to couplings, pup joints, and connectors in all grades.
API 5L is a specification for welded or seamless steel line pipe, used in pipeline transportation systems for petroleum and natural gas.
API 5LS is a specification for spiral-weld line pipe. This standard applies to pipeline transportation systems for the petroleum and natural gas industries.
API5LU is a specification for ultra high-test heat treated line pipe. This specification covers ultra high-strength welded or seamless steel line pipe for use in transporting oil and gas.
API 5LX is an API specification for high-strength welded or seamless line pipe. This specification applies to line pipe used to convey gas, oil, and water in the gas and oil industries.