Line Pipe For Sour Service - Chinaprice: contact company for price
line pipe, Line Pipe for Sour Service, line pipes, pipeline,
steel line pipe
The line pipes can be used for a wide range of petrol and
gas transportation under sour service environment.
For petrol and gas transportation under sour service
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
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
(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
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
- Posted By: Sunny Steel Tubosacero ltd.
- Phone: 862133780199
- Address: No.273, Siping Road, Shanghai, China
- Website: http://www.sunnysteel.com
Published date: October 7, 2013 -
- Business Description: Sunny Steel provide a wide range of steel products as Steel pipes,
Seamless tube and seamless pipes, Alloy pipes, Pipe fittings, Composite
steel pipe used in the construction industry.
We provide a wide range of steel products used in the construction industry:
Composite steel pipe
Contact us today to arrange a quote or estimate. Our steel fabrication products are real trusted and most affordable choice.
Factory and industrial products
In addition to our steel products for construction, we also offer a variety of steel fabrication products for use in industry. We provide local factories with steel cutting, fabricating, and distributing pipe fittings anc composite pipes.
Our versatility ensures we will be able to provide you with the steel products you require to to complete a project, from start to finish.
Contact us today to arrange a quote or estimate
As a long established steel fabrication company in China, we can be trusted to deliver what you need, in the time you need it. We understand that in the construction industry time frame is often important.
Whilst providing a quality, trusted service, we also place a high premium on quality craftsmanship. Our steel products are long lasting, and always meet our clients exact specifications.
Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.
Call us today to discuss your project's needs and find out what options are available.
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