The American Petroleum Institute has several standard specifications for pipe. They set forth dimensions, materials, quality control during manufacture, minimum physical properties such as yield strengh, etc.

Sunny Steel can supply superior Quality High strength, High Toughness, Homogeneous material and Corrosion Resistant Line Pipes for various special service such as offshore and sour services.

UOE:

available from 16in. up to 64in. OD (world’s largest)
UOE line pipe can be supplied as high strength line pipe up to Grade X80, and high toughness line pipe for low-temperature services and corrosive gas or crude oil service.

HFW:

available up to 26in. OD, with wall thickness up to 1in. (world’s largest)
HFW line pipe can be supplied as high strength API grade line pipe up to 5L X80, and high grade line pipe for sour gas service and offshore service.

SMLS:

available up to 16-3/4in. OD
SMLS line pipe can be supplied with corrosion resistant alloy pipe (weldable12% Cr Line Pipe) and high strength API grade line pipe up to 5L X80 for crude oil, gas, water and slurry service.
API SPEC 5L
API SPEC 5L is a international standard specifies requirements for the manufacture of two product specification levels (PSL 1 and PSL 2) of seamless and welded steel pipes for use in pipeline transportation systems in the petroleum and natural gas industries.
Applications:

• for the purpose of transportation of gas,water,oill in oil&gas industry.

Specifications Ranges:

• OD: 1/2-48inch (21.3mm-1219mm)
• WT: SCH10-SCH80 (0.5mm-40mm)

Material Standard:

• PSL 1: A25, A, B, X42, X46, X52, X56, X60, X65, X70
• PSL 2: B, X42, X46, X52, X56, X60, X65, X70, X80

API SPEC 5CT (OCTG)
Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells.
Specifications Ranges:

• OD: 1.05- 20inch (26.67mm-508mm)
• WT: (2.87mm-23mm)

Material Standard:

• J55, K55, N80, L80, P110, Q125, ect
• LTC, STC, BTC, VAM, EUE, NUE, ect

Applications:

• Tubing is used in extracting petroleum & natural gas.
• Casing pipe serves as wall of well.

Note: c: The sum of the columbium [niobium], and vanadiumcontents shall not exceed 0.06% except that, by agreement between the purchaser and the manufacturer, an alternative maximum may be established.