Line Pipe For Sour Service - China

Line Pipe for Sour Service

line pipe, Line Pipe for Sour Service, line pipes, pipeline,

steel line pipe

line pipe

line pipes

pipeline

The line pipes can be used for a wide range of petrol and

gas transportation under sour service environment.

Standards:

GB/T9711.3

API5l/ISO3183-2007

Application:

For petrol and gas transportation under sour service

environment.

Sizes range

1/4 inch Nominal to 24 inchO.D.

Wall Thickness-Schedule 10 through XXH

Line Pipe Steels Used in Sour Service

Line pipe steels used in sour service are prone to hydrogen-

induced cracking (HIC) depending on metallurgical and

environmental factors.

The metallurgical factors consist of alloying elements,

microstructure, strength, segregation, and shape of non-

metallic inclusions.

Some environmental factors which

influence HIC, also known as stepwise cracking (SWC), are

the partial pressures of hydrogen sulfide (H2S) and carbon

dioxide, temperature, pH of the medium, and aggressive ions,

such as chloride.

Many failures of sour gas line pipes have

occurred around the world as a result of HIC.

Considerable effort has been expended by steel line pipe

producers, users, and research organizations to understand

the HIC mechanism, to develop a laboratory test method to

identify and quantify material susceptibility to HIC, and to

produce steels with greater HIC resistance.

NACE

International has developed a standard test, TM-02-84, for

line pipe steels.

The method describes procedures for evaluating the

resistance of pipeline steels to SWC induced by H absorption

from aqueous sulfide corrosion.

The test is applicable to

line pipe with wall thicknesses of 5 mm to 30 mm.

The

procedure consists of exposing unstressed coupons to

synthetic seawater saturated with H2S at ambient temperature

and pressure at a pH in the range 4.8 to 5.4 for 96 h.

The

samples are sectioned, polished metallographically, and

etched, if necessary, so that cracks can be distinguished

from small inclusions, laminations, scratches, or

discontinuities.

Crack sensitivity ratio (CSR), crack length

ratio (CLR), and crack thickness ratio (CTR) are calculated

for each section.

The average is determined for each coupon.

In recent work by Canada’s Centre for Mineral and Energy

Technology in collaboration with the Canadian Standards

Association (CSA) Sour Service Task Force, two parameters

were determined experimentally for each of 19 line pipe

steels:

(1) threshold H concentration (CthH) or the concentration of

diffusible H in the steel above which cracking occurs and

(2) threshold pH (pHth) or the pH below which cracking

occurs.

For intermediate grades, the difference between the

specified maximum yield strength and the specified minimum

yield strength shall be as given in the table for the next

higher grade, and the difference between the specified

minimum tensile strength and the specified minimum yield

strength shall be as given in the table for the next higher

grade, For intermediate grades, the tensile strength shall

be ≤ 760 MPa (110 200 psi).

This limit applies for pipe with D <323, 9 mm (12.750 in).

For intermediate grades, the specified minimum tensile

strength for the weld seam shall be the same value as was

determined for the pipe body using footnote a).

For pipe with D

Company Contact:

• Posted By: Sunny Steel Tubosacero ltd.

• Phone: 862133780199

• Address: No.273, Siping Road, Shanghai , Shanghai , China

• Email:

• Website: https://www.sunnysteel.com

• Business Description: Sunny Steel provide a wide range of steel products as Steel pipes,
  
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