ZC manufactures full range of API seamless line pipes of superior quality, including those of high strength, high toughness, homogeneous material and corrosion resistance, for various services such as onshore, offshore, shallow water and deep water, non-sour and sour services.
Application Of Seamless Line Pipe
Line pipes are used for transporting various fluids, including oil, gas, and water, over long distances in pipelines, which are employed in both onshore and offshore applications.
Supply Range Of Seamless Line Pipe
Standard: API 5L latest edition
Product Specification level: PSL1, PSL2
Grades: Grade A, B, X42, X46, X52, X56, X60, X65, X70, X80(suffix with N, Q, S dependently)
Diameter: 1/2in to 26in
Thickness: SCH10, SCH20, SCH40, STD, SCH 80, SCH XS, SCH 160.
Length: 6m or 11.8m or customized
Pipe End: Plain-end or beveled end with caps
Surface: Bare, clear varnished, black coating, FBE, 3PE, etc.
Marking: standard or customized
Manufacturing Process Of Seamless Line Pipe
1.Hot-rolling
2.Hot-expanding
3.Cold rolled or cold drawn
Tolerances Of API 5L Seamless Line Pipe
Tolerance for Diameter
Diameter mm(in) | Diamter Tolerance mm(in) | Out of Roundness Tolerance |
Pipe Body | Pipe end(I.D.) | Pipe body | Pipe end(I.D.) |
＜60.3(2.375) | ±0.5mm or ±0.0075D
whichever is greater | ±0.5mm or ±0.005D
whichever is greater but max is ±1.6(0.063) | 0.9(0.036) | 0.6(0.024) |
≥60.3(2.375)
to≤610(24.00) | ≤0.015D | ≤0.01D |
Tolerance for Wall Thickness
Wall Thickness mm(in) | Tolerance mm(in) |
<4.0(0.157) | +0.6(0.024),-0.5(0.020) |
4.0(0.157)≤t<10(0.394) | +0.150t,-0.125t |
10.0(0.394)≤t<25.0(0.984) | ±0.125t |
t≥25(0.984) | +3.7(0.146)or+0.1t , which is larger,
-3.0(0.120)or-0.1t,which is larger |
Straightness, max for full length of pipe | ≤0.15%L |
Straightness, max deviation for pipe end | ≤3mm/m |
Length | ±200mm for general,
±25.4mm for special |
Sour Service Application
Resists Hydrogen Including Cracking (HIC) and Sulphide Stress Corrosion Cracking (SSC). The HIC test has a stringent criteria of 5% Crack Length Ratio (CLR) and 3% Crack Thickness Ratio (CTR).
Item | Criteria of Acceptance | Test Method |
SSC | Based on ASTM G39, four-point bending, NACE TM 0177 solution A,
72%*SMYS, test time≥720h | NACE TM 0177 |
HIC | Solution A,CSR≤2%,CLR≤5%,CTR≤3% | NACE TM 0284 |
