Steel line pipe for oil & gas

Steel line pipe for oil & gas

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What is Line Pipe:

Line pipe is a type of pipe that is manufactured from high strength carbon steel. It is typically made according to metallurgical specifications that were developed by the American Petroleum Institute (API). Line pipe can be used to build pipelines that transport a variety of resources including natural gas, oil, petroleum, and water. This pipe is available in a variety of diameters ranging from 2 inches to 48 inches. Line pipe can include either seamless or welded carbon steel or stainless steel piping. Because line pipe needs to withstand high pressures, there are important tests done on line pipe to ensure it meets all of the requirements of steel chemistry, strength, toughness, and dimensional characteristics. Using line pipe that meets the set criteria will ensure safe and reliable pipeline service.The size and diameter of line pipe that is required for a pipeline can vary based on the amount of gas or liquid that a pipe is intended to carry as well as the pressures that a line pipe must withstand. For example, in most cases a mainline, the principal pipeline that delivers natural gas, will require line pipe that is around 16 to 48 inches in diameter. Smaller pipelines that deliver gas to the mainline or take gas from a mainline can be constructed of 6 to 16 inch diameter line pipe. One can determine the necessary diameter required for a pipeline by considering the volume of gas or liquid that the line pipe will be carrying as well as the pressure at which this will be transported.The thickness requirements for line pipe are determined by the maximum operating pressure required for a pipeline. This is based on published standards and federal regulations. Following proper safety regulations when selecting and installing line pipe, will ensure proper pipeline operation and prevent dangerous or hazardous situations.

Steel line pipe for oil & gas

TYPES OF OIL & GAS PIPES
Steel pipes can be classified according to multiple criteria, such as:

Manufacturing process: seamless, erw, LSAW, DSAW, HSAW pipes
Finishing: cold rolled, hot rolled, cold finished
Materials: metal, plastic, cement, glass, fiberglass, etc and material grades (carbon steel, stainless steel, nickel alloy steel pipes)
Manufacturing norms

Line pipe sizes, grades and dimensions
Nominal pipe sizes (NPS) and diameters differ on the transported amount of gas or other flammable liquid as well as the pressures it has to withstand. The outside diameter (OD) of line tubes ranges from 1/8″ to 80″ in accordance with API 5L and other international standards (DIN, ASTM/ASME, NFA, EN) and grades (A / B / X-42 / X-46 / X-52 / X-56 / X-60 / X-65 / X-70 / X-80). Industry standards and federal regulations also specify wall thickness that is determined by the maximum operating pressure (MAOP). Further detailed information is displayed in our line pipe product chart.

standard of Steel line pipe for oil & gas

  • API 5L/ISO 3183 Gr. A, B, X42, X46, X52, X56, X60, X65, X70, X80
  • ASTM A134 and ASTM A135
  • CSA Z245.1 Gr. 241, 290, 359, 386, 414, 448, 483, 550

Dimensional Tolerances for Line Pipes to API Specification 5L / ISO 3183

Pipe SizeDiameter Tolerances
Pipe oxeept the endPipe end 1)
Mrtmir,ai Specified Outside Nominal Pipe Size Djam〇terseamless weldedseamless welded
Up to 2″ Up to 60.3 mm-0.8 mm / + 0.4 mm-0.4 mm / + 1.6 mm
, c. . . 60.3 mm up to 2 t〇6.._nd. 168.3mmjncl.± 0.0075 D
6*to24*,incl. 168.3 mm up to 610 mm. incl.+/- 0.0075 D±0.0075 D butmaximum of *3.2+/- 0.005 D. but maximum of +/-1.6 mm
26′ up to 56″, incl. 660 up to 1422 mm incl.+/- 0.01 D± 0.005 D but maximum of ±4.0+/- 2.0 mm+/-1.6 mm
Over 56* Over 1 422.0 mmas agreed

Pipeline System Supply delivers line pipe for onshore and offshore applications in the oil and gas industry used to convey natural gas, oil and other flammable fluids. Due to extreme conditions such as low and high temperature, high pressure and corrosive environments in the transportation of flammable media, line tubes are made from carbon, alloy or stainless steel in accordance with API 5L, EN and ISO 9001 standards. International standards determine metallurgical specifications to guarantee safe, reliable and long lasting pipelines. Therefore important tests are performed on line pipe to ensure it meets all of the determined requirements of steel chemistry, strength, toughness, and dimensional characteristics. Steel pipes can be manufactured seamless and in different welded varieties ranging from Fusion Welded (EFW), Electric Resistance Welded (ERW), High Frequency Induction (HFI) to Double Submerged Arc Welded (DSAW).

API 5L Seamless Line Pipe Specifications

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The American Petroleum Institute specification API 5L covers seamless and welded steel line pipe.  This is steel pipe for pipeline transportation systems in the petroleum and natural gas industries.  API 5L is suitable for conveying gas, water, and oil.  Size range is limited only by manufacturer’s capabilities.

Specifications for API 5L adhere to the International Organization for Standardization ISO 3183, which standardizes pipeline transportation systems within the materials, equipment and offshore structures for petroleum, petrochemical, and natural gas industries.  The technical committee authoring the standards recognized that there are two basic Product Specifications Levels (PSL) of technical requirements and therefore developed PSL 1 and PSL 2.  PSL 1 is a standard quality for line pipe where PSL 2 contains additional chemical, mechanical properties, and testing requirements.

Grades covered by this specification are A25 ,A ,B (and the following “X” Grades), X42, X46, X52, X56, X60, X65, X70, X80.  The two digit number following the “X” indicates the Minimum Yield Strength (in 000’s psi) of pipe produced to this grade.

Federal Steel Supply stocks a full range of API 5L X52 PSL-1 & PSL-2 line pipe in seamless.

Sizes
Nominal Pipe Size 2″ to 24″ O.D.
Wall Thickness – Schedule 10 through 160, STD, XS, XXS.


Standard                                            API 5L

Product Specification Level             PSL-2

Steel grade                                         X52

Chemical Properties %

PSLC, a   Mn aP       S SiVNbTiOtherCEIIWCEpcm
10.241.400.0250.0150.450.100.050.04b,c.0430.025
20.281.400.030.03–bbb–––

 Mechanical Properties        

                                                                        API 5L PSL-1 X52                API 5L PSL-2 X52

Tensile strength, min /max, psi (MPa)         66,700(460)/ n/a66,700 / 110,200

Yield strength, min /max, psi (MPa)            52,000 (300)/n/a          52,000 / 76,900

  1. a.      For each reduction of 0.01% below the specified maximum concentration for carbon, an increase of 0.05% above the specified maximum concentration for manganese is permissible, up to a maximum of 1.65% for > grades B, but < X52; up to a maximum of 1.75% for grades >X52, but <X70; and up to a maximum of 2.00% for grade X70
  2. b.      The sum of the niobium, vanadium, and titanium concentrations shall be < 0.06%.
  3. c.       Unless otherwise agreed, 0.50% maximum for copper, 0.30% maximum for nickel, 0.30% maximum for chromium, and 0.12% maximum for molybdenum.

Select differences between PSL 1 and PSL 2:

PSL1PSL2
CVN impact (Charpy) testingNone requiredRequired for all grades
Nondestructive inspection of seamlessOnly when purchaser specifies   SR4SR4 mandatory
CertificationCertificates when specified per SR15Certificates (SR 15.1) mandatory
TraceabilityTraceable only until all tests are passed, unless SR15 is specifiedTraceable after completion of tests (SR 15.2) mandatory
Hydrostatic TestRequiredRequired

What’s Underground Coated Steel Pipe

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Many individuals usually confused about concerning the plastic-coated pipes and 3PE anti-corrosive pipes because they are extremely comparable to their look. The covered plastic pipeline, also known as underground covered steel pipe or steel-plastic composite steel pipeline, is the steel pipeline which is melted a natural layer with a thickness of 0.5 ~ 1.0 mm on the inner and also external walls such as customized polyethylene (PE), ethylene-acrylic copolymer (EAA), epoxy (EP) powder, non-toxic polypropylene (PP) or non-toxic polyvinyl chloride (PVC). This below-ground covered steel pipe incorporates the advantages of steel and plastics. It not only has the advantages of high strength, very easy link, water effect resistance and so forth however likewise terminates the downsides such as easy rust, pollution, scaling, reduced toughness of the plastic pipe as well as inadequate fire-fighting efficiency of steel pipe in water. It offers a lengthy life expectancy and more financially with layout life can get to 50 years.

What's Underground Coated Steel Pipe

Coted pipe
Firefighting covered steel pipeline is the most generally utilized plastic layered steel pipeline, with a steel pipeline as the base pipe, the outer wall surface finishing high adhesion, effect resistance, deterioration resistance weather resistance kind of thermosetting powder finish and also the inner wall surface coating food grade sanitary polycarbonate powder finishing, and after that made by sandblasting and chemical therapy, preheating, inner paint, external painting, curing and also various other post-treatment.

The functions of below ground covered steel pipeline
The pipeline wall is smooth as well as burr-free, suitable for the underground or one more humid environment, can hold up against very high or reduced temperatures.
It have a solid capacity to stand up to stress, also can withstand the stress of 6Mpa.
With superb anti-interference ability, it can successfully evaluate the signal interference from the outside.
The covering itself additionally has good electric insulation and does not create corrosion.

The Specification of underground coated steel pipe
Color: black, gray, blue, red, white, eco-friendly;
Layer thickness: PE( customized polyethylene) coating density is 400um– 1000um, EP( epoxy material) is 100um– 400um;
Layer method: Hot-dip EP, epoxy internal/external spraying;
Specification: DN15– DN1660;
Ambient temperature: -30 ℃ to 120 ℃;.
Link: cord clasp (DN15-DN100), groove (DN65-DN400), flange (ideal for any size), welding type, bimetal link, outlet, pipeline joint, securing connection, and so on

Applications of underground layered steel pipeline.

  1. The plastic-coated pipeline can be utilized in all kinds of flowing water system (civil flowing water as well as industrial circulating water), fire water system, structure water system and also water drainage transportation, city sewage pipeline;.
  2. Gas discharge, mud sharing, drainage as well as air flow system in the coal mine;.
  3. The chemical anticorrosive pipeline transportations various chemical fluids, such as acid, antacid and other harsh media.
  4. Utilized for the security of hidden pipelines as well as interaction wires of electric cords as well as cables.
  5. It can ensure the normal operation of the water blood circulation system of central air conditioning in the HVAC circulation system of air conditioning.