What is the Meaning of API 5L Pipe?

Api 5L pipe corrosion is mainly for wall thinning, pitting rot point pit stress cracks. Pipe detection is the application of various technologies truly and records, including basic dimensions (pipe wall thickness and diameter) pipeline straightness road internal and external corrosion in pipeline straightness, said internal and external corrosion conditions (corrosion size, shape, depth and occur parts corrosion zone size, the shape of the depth and the occurrence site corrosion size, shape, depth, and locations), weld defects, as well as crack, weld defects such as cracks. Currently, it have done a lot of work in the oil and gas pipeline corrosion at home and abroad in the oil and gas pipeline corrosion proposed a variety of detection technologies, part of the technology has been applied and achieved good results. These include: the magnetic leakage detection technology, ultrasonic magnetic flux leakage detection technology and ultrasonic measurement techniques, eddy current inspection, ray detection technology based on optical principles lossless.

The magnetic flux leakage detection technology for its the online detection capabilities, high degree of automation, the unique advantages to meet the continuity of the pipeline operators, and online testing, fast and online testing requirements, the magnetic flux leakage testing to become the most widely used so far only a the seed powder detection methods used in oilfield pipeline is extremely broad. In addition, compared with the conventional magnetic particle testing, magnetic flux leakage testing with quantitative test results, the characteristics of high reliability, high efficiency and low pollution.

Ultrasonic detection technology is the use of ultrasonic pulse reflection principle to measure the thickness of the pipe wall corrosion, seized the probe perpendicular to the method is the use of ultrasonic pulse reflection principle to measure the wall thickness of corrosion, the prosecution will probe the vertical pipe wall transmits ultrasonic pulse, the probe first accept transmitting ultrasonic pulses to the pipe wall, and then the ultrasound probe by the wall inner surface of the reflected pulses, the spacing of the two mapping the thickness.
Eddy current testing is based on electromagnetic field theory based NDT methods. The technology Primitive: pass in the two primary coils within the flow detector, so that the pipe surface due to the magnetic induction generated by the vortex with a flow-type detector to weak electrical two primary coil inside pass to a weak electric, if the wall is no defect , the flux of each early and secondary coils for detection. If the wall is not defective, the magnetic flux in each early on with the secondary winding for detection.

Ray detection technology, radiography, it can be used to detect pipeline localized corrosion means of a standard image special radiography, the technology is applicable to virtually all pipeline materials, can measure the wall thickness of the sample object shape and surface roughness indicator and detection of volumetric defects in pipe weld porosity, slag and loose sensitive than the highly stringent requirements ray technology advantage can be obtained permanent record results lower than the straight plane defect detection sensitivity. Detection technology a wide range of simple irradiation is not required to remove the layer of insulation on the pipes.

Sizes 
Nominal Pipe Size 2″ to 24″ O.D.
Wall Thickness – Schedule 10 through 160, STD, XS, XXS. 
Standard : API 5L 
Line Pipe Physical Properties

Standard Line Pipe has grade designation A and B.

Select differences between PSL 1 and PSL 2:
 Data

PSL1

PSL2

CVN impact (Charpy) testing

None required

Required for all grades

Nondestructive inspection of seamless

Only when purchaser specifies   SR4

SR4 mandatory

Certification

Certificates when specified per SR15

Certificates (SR 15.1) mandatory

Traceability

Traceable only until all tests are passed, unless SR15 is specified

Traceable after completion of tests (SR 15.2) mandatory

Hydrostatic Test

Required    

Required

Note: 
This is summarized information from API Specification 5L. Please refer to the specific Standard or Specification or contact us for more details.

Types of API 5L Pipes

API 5L LSAW Pipes:
Grades covered by this specification are A25, A, B and “X” Grades API 5L X42 LSAW Pipes, API 5L X46 LSAW Pipes, API 5L X52 LSAW Pipes, API 5L X56 LSAW Pipes, API 5L X60 LSAW Pipes,API 5L X65 LSAW Pipes, API 5L X70 LSAW Pipes, API 5L X80 LSAW Pipes.
The two digit number following the “X” indicates the Minimum Yield Strength (in 000′s psi) of pipe produced to this grade.
API 5L DSAW Pipes:
Grades covered by this specification are A25, A, B and “X” Grades API 5L X42 DSAW Pipes, API 5L X46 DSAW Pipes, API 5L X52 DSAW Pipes, API 5L X56 DSAW Pipes, API 5L X60 DSAW Pipes,API 5L X65 DSAW Pipes, API 5L X70 DSAW Pipes, API 5L X80 DSAW Pipes.
The two digit number following the “X” indicates the Minimum Yield Strength (in 000′s psi) of pipe produced to this grade.
API 5L Seamless Pipes:
Grades covered by this specification are A25, A, B and “X” Grades API 5L X42 Seamless Pipes, API 5L X46 Seamless Pipes, API 5L X52 Seamless Pipes, API 5L X56 Seamless Pipes, API 5L X60 Seamless Pipes,API 5L X65 Seamless Pipes, API 5L X70 Seamless Pipes, API 5L X80 Seamless Pipes.
The two digit number following the “X” indicates the Minimum Yield Strength (in 000′s psi) of pipe produced to this grade.

Chemical Compositions(%) of API 5L PSL1

Grade C≤ Mn≤ P≤ S≤ Si≤ V≤ Nb≤ Ti≤
B 0.28 1.20 0.030 0.030
X42 0.28 1.30 0.030 0.030
X46 0.28 1.40 0.030 0.030
X52 0.28 1.40 0.030 0.030
X56 0.28 1.40 0.030 0.030
X60 0.28 1.40 0.030 0.030

Mechanical Properties of API 5L PSL1

Grade Yield Strength (Mpa) Tensile Strength (Mpa)
B ≥245 ≥415
X42 ≥290 ≥415
X46 ≥320 ≥435
X52 ≥360 ≥460
X56 ≥390 ≥490
X60 ≥415 ≥520

Chemical Compositions(%) of API 5L PSL2

Grade C≤ Mn≤ P≤ S≤ Si≤ V≤ Nb≤ Ti≤ CEpcm≤
B 0.24 1.20 0.025 0.015 0.40 c c 0.04 0.25
X42 0.24 1.20 0.025 0.015 0.40 0.06 0.05 0.04 0.25
X46 0.24 1.40 0.025 0.015 0.40 0.07 0.05 0.04 0.25
X52 0.24 1.40 0.025 0.015 0.45 0.10 0.05 0.04 0.25
X56 0.24 1.40 0.025 0.015 0.45 0.10 0.05 0.04 0.25

Mechanical Properties of API 5L PSL2

Grade Yield Strength (Mpa) Tensile Strength (Mpa)
B 245-450 415-760
X42 290-495 415-760
X46 320-525 435-760
X52 360-530 460-760
X56 390-545 490-760

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

Specification of API 5L pipe

The American Petroleum Institute specification API 5L covers seamless and welded steel line pipe. It includes standard-weight and extra-strong threaded line pipe. It includes standard-weight and extra-strong threaded line pipe; and standard-weight plain-end,regular-weight plain-end, special plain-end, extra-strong plain-end, special plain-end, extra-strong plain-end pipe; as as well as bell and spigot and through-the-flowline(TFL) pipe.

The purpose of this specification is to provide standards for pipe suitable for use in conveying gas, water, and oil in both the oil and natural gas industries.

1.2 Dimensional requirements on threads and thread gauges, stipulations on gauging practice, gauge specifications and certification, as well as instruments and methods for inspecition of threads are given in API Standard 5B and are applicable to products covered by this specification.

Grades covered by this specification are A25, A, B, X42, X46, X52, X56, X60, X65, X70, and X80 and grades intermediate to the Grades X42 and higher listed (see note). The chemical composition and mechanical properties of intermediate grades that are subject to agreement between the purchaser and the menufacturer must be consistent with the corresponding requirements for the grades to which the material is intermediate.
Note : The grade disignations used herein for Grades A and B do not include reference to the specified minimum yield strength. Other grade designations used herein comprise the letter A or X followed by the first two digits of the specified minimum yield strength.
1.3 Pipe manufactured as Grade X60 or higher shall not be substituted for pipe ordered for Grade X52 or lower with-out purchaser approval.
1.4 Although plain-end line pipe meeting this specifiecation is primarily intended for field makeup by circumferential welding, the manufacturer will not assume responsibility for field welding.
1.5 For regular-weight and special plain-end pipe(special weight) whown in Tables 6A, 6B, and 6C and for standard weight threaded pipe larger than nominal size 12, the size designations used herein are outside diameter sizes. For all other pipe, the size designations are nominal pipe sizes. In the text of this specification, pipe size limits(or size ranges)are outside diameter sizes except where stated to be nominal. These outside diameter size limits and ranges also apply to the corresponding nominal sizes.
1.6 Class Ⅱ steel is rephosphorized and problbly has better threading properties than Class I. Because Class Ⅱ has higher chemical properties than Class I, it may be somewhat more difficult to bend.
1.7 U.S. customary units are used in this specification; metric(SI) units are shown in parenthese in the text and in many tables. See Appendix J for specific information about rounding procedures and conversion factors.

Steel grade of API 5L:

API 5L GR.B PSL 1

The Chemical Composition(%) of API 5L Gr.B PSL1

Mass fraction, based upon heat and product analysis a
Seamless pipe
C Mn P S V Nb Ti
maxb max.b max. max. max. max. max.
0.28 1.20 0.030 0.030 c,d c,d d
Welded pipe
C Mn P S V Nb Ti
maxb max.b max. max. max. max. max.
0.28 1.20 0.030 0.030 c,d c,d d
0.26 1.20 0.030 0.030 c,d c,d d

Note:

  • 0.50% maximum for copper, 0.50% maximum for nickel, 0.50% maximum for chromium, and 0.15% maximum for molybdenum.
  • For each reduction of 0.01% below the specified maximum concetration for carbon, an increase of 0.05% above the specified maximum concentration for manganese is permissible, up to a maximum of 1.65%
  • unless otherwise agreed, the sum of the niobium and vanadium contents shall be ≤0.06%.
  • The sum of the niobium ,vanadium and titanium concentratons shall be ≤0.06%.
  • Unless otheriwse agreed.
  • Unless otherwise agreed, the sum of niobium, vanadium and titanium concentrations shall be ≤ 0.15%

Mechanical requirements of API 5L Gr.B PSL1:

Y.S T.S ELONGATION
Mpa(psi) Mpa(psi)
min min min
245(35 500) 415(60 200) 28%

API 5L PSL2 Gr.B

API 5L PSL2 Gr.B grade designations come from API Spec 5L Specification for Line Pipe. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi). Standard Line Pipe has grade designation A and B.

Application: gas, water and oil transportation in both oil and natural gas.
Mechanical Properties of Steel According to API 5L PSL2 Gr.B

IMPACT TEST

AVG. ABSORBED ENERGY IND. ABSORBED ENERGY
Min.(joules) Min.(joules)
27 20

Chemical composition(%) API 5L PSL2 Gr.B

See the table below for the standard available grades.

API 5L X60 PSL 1 Seamless pipe

Grade C Mn P S Si V Nb Ti CEpcm
(max) (max) (max) (max) (max) (max) (max) (max) (max)
B 0.24 1.2 0.025 0.015 0.4 c c 0.04 0.25

API 5L PSL2 Gr.B Welded pipe

C Mn P S V Nb Ti
maxb max.b min. max. max. max. max. max.
0.26e 1.40e 0.03 0.03 f f f

Mechanical requiremnts of API 5L PSL2 Gr.B

Grade Yield Strength (Mpa) Tensile Strength (Mpa)
API 5L PSL2 Gr.B 245-450 415-760

API 5L X 42 PSL 1

API 5L X42 PSL 1 grade designations come from API Spec 5L Specification for Line Pipe. Standard Line Pipe has grade designation A and B. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi).

Application: gas, water and oil transportation in both oil and natural gas.

Mechanical Properties of Steel According to API 5L PSL1 X42

Size tolerances of API5L - What is the Meaning of API 5L Pipe?

API 5L steel pipes tolerances

Chemical composition(%) API 5L X 42 PSL 1

See the table below for the standard available grades.

API 5L X 42 PSL 1 Seamless pipe

C Mn P S V Nb Ti
maxb max.b max. max. max. max. max.
0.28 1.2 0.03 0.03 c,d c,d d

API 5L X 42 PSL 1 Welded pipe

C Mn P S V Nb Ti
maxb max.b max. max. max. max. max.
0.26 1.2 0.03 0.03 c,d c,d d

Mechanical requiremnts of API 5L X 42 PSL 1

Y.S Mpa(psi) T.S Mpa(psi) ELONGATION
min min min
245(35 500) 415(60 200) 28%

Line pipe mechanical testing usually omits Reduction of Area (RA) measurement reporting, and Charpy V-Notch (CVN) testing. This prevents use of this pipe as body material above 36 ksi yield strength for API Spec 6A equipment without retesting for Reduction of Area, and in the case of low temperature service, Charpy V-Notch testing as well.

API 5L PSL2 X42

API 5L PSL2 X42 grade designations come from API Spec 5L Specification for Line Pipe. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi). Standard Line Pipe has grade designation A and B.

Application: gas, water and oil transportation in both oil and natural gas.
Mechanical Properties of Steel According to API 5L PSL2 X42

Impact test

AVG. ABSORBED ENERGY IND. ABSORBED ENERGY
Min.(joules) Min.(joules)
27 20

Chemical composition(%) API 5L PSL2 X42

See the table below for the standard available grades.

Grade C Mn P S Si V Nb Ti CEpcm
(max) (max) (max) (max) (max) (max) (max) (max) (max)
X42 0.24 1.2 0.025 0.015 0.4 0.06 0.05 0.04 0.25

Mechanical requiremnts of API 5L PSL2 X42

Grade Yield Strength (Mpa) Tensile Strength (Mpa)
API 5L PSL2 X42 245-495 415-760

API 5L PSL1 X46

API 5L X46 PSL 1 grade designations come from API Spec 5L Specification for Line Pipe. Standard Line Pipe has grade designation A and B. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi).

Application: gas, water and oil transportation in both oil and natural gas.
Mechanical Properties of Steel According to API 5L PSL1 X46

Chemical composition(%) API 5L X 46 PSL 1

See the table below for the standard available grades.

API 5L X 46 PSL 1 Seamless pipe

C Mn P S V Nb Ti
maxb max.b max. max. max. max. max.
0.28 1.40 0.030 0.030 d d d

API 5L X 46 PSL 1 Welded pipe

C Mn P S V Nb Ti
max. max.b max. max. max. max. max.
0.26 1.4 0.03 0.03 d d d

Mechanical requiremnts of API 5L X46 PSL 1

Y.S Mpa(psi) T.S Mpa(psi) ELONGATION
min min min
320 (46 400) 435 (63 100) 28%

API 5L PSL2 X46

API 5L PSL2 X46 grade designations come from API Spec 5L Specification for Line Pipe. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi). Standard Line Pipe has grade designation A and B.

Application: gas, water and oil transportation in both oil and natural gas.
Mechanical Properties of Steel According to API 5L PSL2 X46

Impact test

AVG. ABSORBED ENERGY IND. ABSORBED ENERGY
Min.(joules) Min.(joules)
27 20

Chemical composition(%) API 5L PSL2 X46

See the table below for the standard available grades.

Grade C Mn P S Si V Nb Ti CEpcm
(max) (max) (max) (max) (max) (max) (max) (max) (max)
X46 0.24 1.4 0.025 0.015 0.4 0.07 0.05 0.04 0.25

Mechanical requiremnts of API 5L PSL2 X46

Grade Yield Strength (Mpa) Tensile Strength (Mpa)
API 5L PSL2 X46 320-525 435-760

API 5L PSL1 X52

API 5L X52 PSL 1 grade designations come from API Spec 5L Specification for Line Pipe. Standard Line Pipe has grade designation A and B. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi).

Application: gas, water and oil transportation in both oil and natural gas.
Mechanical Properties of Steel According to API 5L PSL1 X52

Chemical composition(%) API 5L X 52 PSL 1

See the table below for the standard available grades.

API 5L X 52 PSL 1 Seamless pipe

C Mn P S V Nb Ti
maxb max.b max. max. max. max. max.
0.28 1.40 0.030 0.030 d d d

API 5L X 52 PSL 1 Welded pipe

C Mn P S V Nb Ti
max. max.b max. max. max. max. max.
0.26 1.4 0.03 0.03 d d d

Mechanical requiremnts of API 5L X52 PSL 1

Y.S Mpa(psi) T.S Mpa(psi) ELONGATION
min min min
320 (46 400) 435 (63 100) 28%

API 5L PSL2 X52

Share

API 5L PSL2 X52 grade designations come from API Spec 5L Specification for Line Pipe. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi). Standard Line Pipe has grade designation A and B.

Application: gas, water and oil transportation in both oil and natural gas.
Mechanical Properties of Steel According to API 5L PSL2 X52

Impact test

AVG. ABSORBED ENERGY IND. ABSORBED ENERGY
Min.(joules) Min.(joules)
27 20

Chemical composition(%) API 5L PSL2 X52

See the table below for the standard available grades.

Grade C Mn P S Si V Nb Ti CEpcm
(max) (max) (max) (max) (max) (max) (max) (max) (max)
X52 0.24 1.4 0.025 0.015 0.4 0.07 0.05 0.04 0.25

Mechanical requiremnts of API 5L PSL2 X52

Grade Yield Strength (Mpa) Tensile Strength (Mpa)
API 5L PSL2 X52 320-525 435-760

API 5L PSL1 X56

API 5L X56 PSL 1 grade designations come from API Spec 5L Specification for Line Pipe. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi). Standard Line Pipe has grade designation A and B.

Application: gas, water and oil transportation in both oil and natural gas.
Mechanical Properties of Steel According to API 5L PSL1 X56

Chemical composition(%) API 5L X 56 PSL 1

See the table below for the standard available grades.

API 5L X 56 PSL 1 Seamless pipe

C Mn P S V Nb Ti
maxb max.b max. max. max. max. max.
0.28 1.40 0.030 0.030 d d d

API 5L X 56 PSL 1 Welded pipe

C Mn P S V Nb Ti
max. max.b max. max. max. max. max.
0.26 1.4 0.03 0.03 d d d

Mechanical requiremnts of API 5L X56 PSL 1

Y.S Mpa(psi) T.S Mpa(psi) ELONGATION
min min min
320 (46 400) 435 (63 100) 28%

API 5L PSL2 X56

API 5L PSL2 X56 grade designations come from API Spec 5L Specification for Line Pipe. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi). Standard Line Pipe has grade designation A and B.

Application: gas, water and oil transportation in both oil and natural gas.
Mechanical Properties of Steel According to API 5L PSL2 X56

Impact test

AVG. ABSORBED ENERGY IND. ABSORBED ENERGY
Min.(joules) Min.(joules)
27 20

Chemical composition(%) API 5L PSL2 X56

See the table below for the standard available grades.

Grade C Mn P S Si V Nb Ti CEpcm
(max) (max) (max) (max) (max) (max) (max) (max) (max)
X56 0.24 1.4 0.025 0.015 0.4 0.1 0.05 0.04 0.25

Mechanical requiremnts of API 5L PSL2 X56

Grade Yield Strength (Mpa) Tensile Strength (Mpa)
API 5L PSL2 X56 390-545 490-760

API 5L PSL1 X60

API 5L X60 PSL 1 grade designations come from API Spec 5L Specification for Line Pipe. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi). Standard Line Pipe has grade designation A and B.

Application: gas, water and oil transportation in both oil and natural gas.
Mechanical Properties of Steel According to API 5L PSL1 X60

Chemical composition(%) API 5L X60 PSL 1

See the table below for the standard available grades.

API 5L X60 PSL 1 Seamless pipe

C Mn P S V Nb Ti
maxb max.b min. max. max. max. max. max.
0.28e 1.40e 0.03 0.03 f f f

API 5L X60 PSL 1 Welded pipe

C Mn P S V Nb Ti
maxb max.b min. max. max. max. max. max.
0.26e 1.40e 0.03 0.03 f f f

Mechanical requiremnts of API 5L X60 PSL 1

Y.S Mpa(psi) T.S Mpa(psi) ELONGATION
min min min
320 (46 400) 435 (63 100) 28%

API X70 steel pipe

API 5L X70 steel pipe - What is the Meaning of API 5L Pipe?

American Petroleum Institute API (American Petroleum Institute) for short, 5L refers to the API standard API Spec 5L “line pipe”, X70 refers to the steel grade, divided into PSL1 and PSL2, the required minimum yield strength 70300psi, The minimum ultimate tensile strength of 82700psi.

API X70 steel pipe application for the oil and gas industry, oxygen, water, oil pipes.

Yaang is specialized in supplying API 5L steel pipe in X70. 
For more information of API 5L X70 steel pipe, please check them in following:

Chemical composition of API 5L X70
 C(%)  Si(%)  Mn(%)  P(%)  S(%)  Nb(%)
 ≤0.16  ≤0.45  ≤1.70  ≤0.020  ≤0.020  ≤0.06

Mechanical properties of API 5L X70
 Tensile strength (Mpa)  Yield strength (Mpa) Yield Ratio  Elongation (%)
485-605  ≥0.90 18  ≥40

API 5L X70 steel pipe Surface: Black painted,PE coated,Galvanized,color coated,etc

API 5L X70 steel pipe Delivery States:Heat treatment facilities for hot-rolled,controlled rolling, normalizing, annealing, tempering, quenching, normalizing plus tempering, quenching and tempering, and other delivery states are available as customers’ requirement.

API 5L X70 steel pipe Tests:HIC, SSC, SPWHT, Macrostructure, detection of defects,Hardness and DWTT test and en10204/3.1 certificate are also available.

Note:

LENGTHS

Range I: 4,00-12,00 meters (13,1-40,0 ft)Fixed lengths within the manufacture lengths range. Tolerances: ± 100 mm (± 3,94 ft)

PROTECTION

Unprotected or external oiled/external varnishedEach pipe is provided with plastic protectors at both ends

MARKING

Die stamping or/and paint stenciled according to standard or per customer requestTechnical details can be also marked on tags attached to each bundle.

DELIVERY

In bundles of maximum 2500 Kg, tied in minimum four places with steel strips.

MILL TEST REPORT

Mill test reports are issued to customer requirements.Usually they comply with EN 10204 – 3.1.B (DIN 50049 – 3.1.B)

Api 5l comparison standards

USA

UK

Germany

Sweden

API 5L

BS3601

DIN 1629

Grade A SMLS

HFS 22 & CDS 22

St 35

SIS 1233-05

Grade B SMLS

HFS 27 & CDS 27

St 45

SIS 1434-06 *

API 5L

BS3601

DIN 1625

Grade A ERW

ERW 22

Blatt 3 St 34-2 ERW

Grade B ERW

ERW 27 1)

Blatt 4 St 37-2 ERW

API 5L

BS3601 Double welded

DIN 1626

Grade A EFW

ERW 22

Blatt 3 St 34-2 FW

Grade B EFW

ERW 27 1)

Blatt 4 St 37-2 FW

API 5L

BS3601

DIN 1626

FBW

BW 22

Blatt 3 St 34-2 FBW

Material Requirements

2.1 CHEMICAL PROPERTIES
2.1.1 Chemical Composition
The composition of pipe furnished to this specification, as determined by heat analysis for pipe other than Grade X 80, shall conform to the chemical requirements specified in Table 2, except that by agreement between the purchaser and the manufacturer carbon contents higher than those specified may be used. the composition of intermediate grades(higher than X42)shall conform to chenical requirements agreed upon between the manufacturer and the purchaser, and such requirements shall be consistent with the requirements specified in Table 2 for the applicable type of pipe For Grades X42 and higher, by agreement between the purchaser and the manufacturer, element other than columbium, vanadium, and titanium may be used; however, caution should be exercised in determining the quantity that may be present for any particular size and thickness of pipe because the addition of such otherwise desirable elements may alter the weldability of the pipe.

2.1.2 Elements Analyzed
As a minimum, each required analysis shall determine the following;
a. Carbon, manganese, phosphorus, sulphur, and silicon.
b. Columbium, vanadium, titanium, or combinations thereof, if added during steelmaking.
c. Any other alloying element added during steelmaking for other than deoxidation purpose.
2.1.3 Product analysis Variation
product analyses shall conform to the chemical requirements shown in Table 2, within the following permissible variations for product analyses, except for Grade X80 pipe where the requirments in Table2 are for product analysis;

Element
Percent of Variation
a. Carbon:
 
Seamless pipe-all nonexpanded and cold expanded smaller than size20
+0.03
seamless pipe-cold expanded size 20 and larger in Grades X42 and higher
+0.04
Welded pipe
+0.04
b. Manganese:
 
All grades through B
+0.05
Where minimum is specified
-0.05
Grade X42 and higher
+0.10
c. Phosphorus:
+0.01
Where minimum is specified
-0.01
d. Sulfur
+0.01

Table 1-Chemical Requriements for Heat Analyses by Percentage of Weight

Table2 Tensile Requirements

*The minimum elongation in 2 in. (50.80mm)shall be that determined by the following equation;

U.S. Custiomary Equaution

Metric Equation

  • e = 625000 A0.2/A0.9
  • e = 1942.57 A0.2/A0.9
Where:
  • e = minimum elongation in 2 in. (50.80mm) in percent to nearest 1/2percent.
  • A = cross-sectioinal area of the tensile test specimen in sq. in.(mm) based or. specified outside diameter or nominal specimen width and specified wall thickness rounded to the nearest 0.01sq. in.(6.5mm2) or 0.75sq. in. (484mm2), whichever is smaller.
  • U = specified minimum ultimate tensile strength, psi, (MPa).

See Appendix D for minimum elongation values for various size tensile specimens and grades. The minimum elongations for round bar tensile specimens [0.350 in.(8.9mm)diameter with 1.4 in. (35mm) gauge length, and 0.500 in.

(12.5mm) diamter with 2.00 in (50.8mm) gauge length] shall be that shown in the Area A line of 0.20sq. in. in Table D-1, Appendix D.

Test Methods for API 5L Line Pipe
API 5L is the implementation standard of steel pipe for pipeline transportation system. As we know, this standard specification includes Grade B, X42, X46, X52, X56, X60, X65, X70, X80 etc. And divided in two product specification level, PSL1 and PSL2. More over, API 5L pipe is also the pipeline steel pipe, applied to the oil and gas transmission system. Meanwhile, other fluids like steam, water, slurry adopts the API 5L standard for the transmission purposes. Below we will introduce the methods for API 5L line pipe.
1). Hydrostatic test
a. Jointers need not be hydrostatically level, provided that the portions of pipe used in making the jointers were successfully hydrostatically tested prior to the joining operation.
b. Except the previous situation, the pipe shall withstand the hydrostatic test without leakage through the weld seam or the pipe body.
2). Bend test
Cracks should not occur in any part of the sample and opening of weld shall not occur as well.
Please Note: For all bend test, the weld extends to a distance of 6.4 mm (0.25 in) on each side of fusion line.
3). Flattening test
The flattening test method is used to verify the deformation performance of line pipe to the specified size, and display its defects. According to the stress and deformation characteristics of the specimen during the flattening process, the flattening test shall show the resistance to longitudinal cracking and circumferential cracking of the pipe, and display its internal defects and surface defects.
Dimensions tolerance for API 5L seamless pipe
1. For outer diameters less than 2 3/8 in (60.3 mm), pipe body diameter tolerance +/-0.5 mm. Pipe end +/- 0.5 mm; Out of Roundness tolerance for pipe body is 0.9 mm (0.036 in), pipe end 0.6 mm (0.024 mm).
2. For OD equal or above 2 3/8 in (60.3) to 24 in (610 mm), (diameter tolerance) for pipe body is +/- 0.0075D, pipe end +/- 0.005D but max to +/- 1.6 mm (0.063mm); Roundness tolerance for pipe body ≤ 0.015D, pipe end ≤ 0.01D.
(In case agreed with manufacturer and client, more strictly tolerances could be applied)
3. For wall thickness
Below than 4 mm (0.0157 in), tolerance +0.6 (0.024 mm), -0.5 mm (0.020 in);
For API 5L seamless steel pipe thickness in 4 mm to 10 mm (0.394 in), +0.150t, -0.125t;
For API seamless pipe thickness 10 mm to 25mm (0.984 in), +/-0.125t;
Wall thickness ≥ 25 mm, +3.7mm or +0.1t (if larger) and -3.0 mm (0.120 in) or -0.1t (if larger).
t for thickness;
4. For straightness, max for full length, tolerance maximum 0.15% of length.
5. Straightness, max deviation for pipe end, shall be ≤ 0.3 mm /m.
6. Length +/- 200 mm for general, +/- 25.4 mm for special.

Source: China Steel Pipes Manufacturer – Yaang Pipe Industry Co., Limited (www.steeljrv.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@steeljrv.com

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  • The standard and application of stainless steel seamless pipe and welded pipe

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  • API 5L Specification for Line Pipe

References:

  • https://www.yaang.com

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