STANDARDS / LINE PIPE

API 5L line pipe

A line-pipe order is defined by more than grade. PSL, dimensions, manufacturing route, delivery condition, service and supplementary requirements must reach the mill as one controlled specification.

Discuss the requirement ↗

API 5L large-diameter line pipe undergoing dimensional and ultrasonic quality control — API 5L LINE PIPE QUALITY CONTROLILLUSTRATIVE VIEW

SpecificationAPI 5L / ISO 3183

LevelsPSL 1 / PSL 2

RoutesSMLS / HFW / HSAW / LSAW

DocumentsMTC / test reports / MRB

01 / PURCHASE DESCRIPTION

Build the order around the complete designation.

The enquiry should state the applicable edition, product specification level, steel grade, outside diameter, wall thickness, length, manufacturing process and delivery condition. Project specifications can add requirements beyond the base standard.

02 / SERVICE

Special service changes the qualification route.

Sour service, offshore service, low-temperature duty, fracture control and other demanding conditions may require chemical restrictions, hardness limits, toughness testing, HIC or SSC testing and specific manufacturing procedure qualification.

03 / RELEASE

Traceability continues through coating and shipment.

Heat identity, pipe numbers, NDT, hydrotest, dimensional results, mechanical tests and coating records are reconciled before release. Required API monogramming and mill licence scope are checked against the proposed source.

TECHNICAL QUESTIONS

What buyers ask.

What is the practical difference between PSL 1 and PSL 2?+

PSL 2 introduces additional controls and mandatory requirements for chemistry, mechanical properties, traceability, testing and documentation. The project specification may add further restrictions.

Does API 5L grade alone define the pipe?+

No. A complete order also needs PSL, dimensions, process, delivery condition, service, tests, ends, coating, lengths, quantities and supplementary requirements.

Can API 5L pipe be supplied with 3LPE?+

Yes when coating is included as a separate, fully defined requirement and the selected pipe mill and coating applicator are qualified for the project.