API 5L X80

API-5L-X80-LINE-PIPE

API 5L X80

API 5L X80 is a type of pipeline steel used in the transportation of petroleum, oil & gas. This type of pipe is mostly used to transfer fluids, including crude oil, natural gas, and petroleum products, from one site to another. 

This sort of pipe is often constructed from high-strength steel, which enables it to survive the high pressures and temperatures that are common in these sectors. In addition, API 5L X80 line pipe is typically coated with a layer of corrosion-resistant material, such as FBE, 3LPE, or 3LPP, to protect it from the harsh environment in which it is used.

Why choose tuspipe?

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Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.

With over 500,000 tons annual production capacity, the company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.

TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality,  the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.

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Application of API 5L X80 Line Pipe

API 5L X80 line pipe is a commonly used pipeline in the petroleum and oil and gas industries. The main advantage of using API 5L X80 materials is its high strength. This allows it to transport large volumes of petroleum and oil without fear of rupturing or leaking. Additionally, its resistance to corrosion means that it can be used in a wide range of environments without fear of degradation. 

As a result, API 5L X80 pipe is an essential component of the petroleum and oil and gas industries, and its applications are varied and essential

Equivalent Steel Grade of X80 Material

Steel GradeEquivalent Grade
API 5L X80 PSL-1
API 5L X80 PSL-2L555Q or X80Q
L555M or X80M

Chemical Composition of API 5L X80 Pipe with t ≤ 0.984”

Steel Grade Mass fraction, % based on heat and product analyses Carbon Equiv a
C Si Mn P S V Nb Ti Other CE IIW CE Pcm
max b max max b max max max max max max max
Seamless and Welded Pipe
X80Q 0.18f 0.45f 1.90f 0.025 0.015 g g g i,j As agreed
Welded Pipe
X80M 0.12f 0.45f 1.85f 0.025 0.015 g g g i,j .043f 0.25

a. SMLS t>0.787”, CE limits shall be as agreed. The CEIIW limits applied fi C > 0.12% and the CEPcm limits apply if C ≤ 0.12%,
b. For each reduction of 0.01% below the specified maximum for C, an increase of 0.05% above the specified maximum for Mn is permissible, up to a maximum of 1.65% for grades ≥ L245 or B, but ≤ L360 or X52; up to a maximum of 1.75% for grades > L360 or X52, but < L485 or X70; up to a maximum of 2.00% for grades ≥ L485 or X70, but ≤ L555 or X80; and up to a maximum of 2.20% for grades > L555 or X80.,
c. Unless otherwise agreed Nb = V ≤ 0.06%,
d. Nb = V = Ti ≤ 0.15%,
e. Unless otherwise agreed, Cu ≤ 0.50%; Ni ≤ 0.30% Cr ≤ 0.30% and Mo ≤ 0.15%,
f. Unless otherwise agreed,
g. Unless otherwise agreed, Nb + V + Ti ≤ 0.15%,
h. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 0.50% Cr ≤ 0.50% and MO ≤ 0.50%,
i. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 1.00% Cr ≤ 0.50% and MO ≤ 0.50%,
j. B ≤ 0.004%,
k. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 1.00% Cr ≤ 0.55% and MO ≤ 0.80%,
l. For all PSL 2 pipe grades except those grades with footnotes j noted, the following applies. Unless otherwise agreed no intentional addition of B is permitted and residual B ≤ 0.001%.

API 5L X80 Mechanical Properties

Pipe Grade Tensile Properties – Pipe Body of SMLS and Welded Pipes PSL 2 Seam of Welded Pipe
Yield Strength a Tensile Strength a Ratio a,c Elongation Tensile Strength d
Rt0,5 PSI Min Rm PSI Min R10,5IRm (in 2in) Af % Rm (psi)
Minimum Maximum Minimum Maximum Maximum Minimum Minimum
X80Q,X80M 80,.500 102,300 90,600 119,700 0.93 f 90,600
a. For intermediate grade, refer to the full API 5L X80 specification.
b. for grades > X90 refer to the full API5L specification.
c. This limit applies for pies with D> 12.750 in
d. 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 foot a.
e. for pipe requiring longitudinal testing, the maximum yield strength shall be ≤ 71,800 psi
f. The specified minimum elongation, Af, expressed in percent and rounded to the nearest percent, shall be determined using the following equation:
equation-formula
Where C is 1 940 for calculation using Si units and 625 000 for calculation using USC units
Axc   is the applicable tensile test piece cross-sectional area, expressed in square millimeters (square inches) , as follows
– For circular cross-section test pieces, 130mm2 (0.20 in2) for 12.7 mm (0.500 in) and 8.9 mm (.350 in) diameter test pieces; and 65 mm2 (0.10 in2) for 6.4 mm (0.250in) diameter test pieces.
–  For full-section test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified outside diameter and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.10in2)
–  For strip test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified width of the test piece and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.10in2)
   U is the specified minimum tensile strength, expressed in megapascals (pounds per square inch
g. Lower values fo R10,5IRm may be specified by agreement
h. for grades > x90 refer to the full API5L specification.

Dimensions and Sizes of API 5L X80

Before buying an API 5L X80 pipe, check its size and dimensions to meet required API 5L X80 standards. Refer to ISO 4200 and ASME B36.10M, which specify dimensions and masses. These standards offer size guides and wall thickness details. Verify compliance by consulting the tables in these standards to ensure the right diameter and correct wall thickness. Purchasing pipes outside these standards may cause installation or usage problems, underscoring the importance of knowing dimensions and tolerances before making a purchase.

NPS O. D. W. T.
DN Inch mm SCH5S SCH10S SCH10 SCH20 SCH30 SCH40 SCH60 SCH80 SCH100 SCH120 SCH140 SCH160 Sth XS XXS
50 2″ 60.3 1.65 2.77 3.91 5.54 8.74 3.91 5.54 11.07
65 2 1/2″ 73 2.11 3.05 5.16 7.01 9.53 5.16 7.01 14.02
80 3″ 88.9 2.11 3.05 5.49 7.62 11.13 5.49 7.52 15.24
90 3 1/2″ 101.6 2.11 3.05 5.74 8.08 5.74 8.08
100 4″ 114.3 2.11 3.05 6.02 8.58 11.13 13.49 6.02 8.56 17.12
125 5″ 141.3 2.77 3.4 6.55 9.53 12.7 15.88 6.55 9.53 18.05
150 6″ 168.3 2.77 3.4 7.11 10.97 14.27 18.26 7.11 10.97 21.95
200 8″ 219.1 2.77 3.76 6.35 7.04 8.18 10.31 12.7 15.09 18.26 20.62 23.01 8.18 12.7 22.23
250 10″ 273.1 3.4 4.19 6.35 7.8 9.27 12.7 15.09 18.26 21.44 25.4 28.58 9.27 12.7 25.4
300 12″ 323.9 3.96 4.57 6.35 8.38 10.31 14.27 17.48 21.44 25.4 28.58 33.32 9.53 12.7 25.4
350 14″ 355.5 3.96 4.78 6.35 7.92 9.53 11.13 15.09 19.05 23.83 27.79 31.75 35.71 9.53 12.7
400 16″ 406.4 4.19 4.78 6.35 7.92 9.53 12.7 16.66 21.44 26.19 30.96 36.53 40.49 9.53 12.7
450 18″ 457.2 4.19 4.78 6.35 7.92 11.13 14.27 19.05 23.83 39.36 34.93 39.67 45.24
500 20″ 508 4.78 5.54 6.35 9.53 12.7 15.09 20.62 26.19 32.54 38.1 44.45 50.01
550 22″ 558.8 4.78 5.54 6.35 9.53 12.7 22.23 28.58 34.93 41.28 47.63 53.98
600 24″ 609.6 5.54 6.35 6.35 9.53 14.27 17.48 24.61 30.96 38.89 46.02 52.37 59.54

API 5L X80 Pipe Tolerance

O.D. Tolerance W.T. Tolerance
X80
D < 60.3mm +0.41/-0.40mm D < 73mm +15%/-12.5%
D ≥ 60.3m +0.75/-0.40mm D ≥ 73mm +15%/-12.5%

Test and inspection of API 5L X80

- Hydrostatic Test

The hydrostatic test is a crucial step in API 5L line pipe production. It involves using water to check for leaks in the weld seam or pipe body. Water pressure is gradually increased until it reaches the specified value.

- Bend Test

The bending test is a vital quality check in API 5L X80 line pipe production. It entails applying force to a steel pipe sample until it cracks, ensuring it won’t fracture under stress during service. Typically performed on welded samples, where failures are common, the test also assesses unwelded samples to verify material quality. Bend test results guide adjustments in the manufacturing process to meet required standards and produce a reliable final product.

- Flattening Test

The flattening test is a crucial mechanical assessment in steel pipe manufacturing, ensuring the quality of the final product and preventing potential issues like cracks. By applying force to a pipe sample until it deforms, the test measures the amount of deformation, offering insights into the pipe’s strength and resistance to cracking.

- CVN Impact Test

Companies producing API 5L X80 must undergo an impact test, evaluating the pipe body, weld seam, and heat-affected zone. This test ensures the line pipe’s ability to withstand abrupt changes in temperature and pressure without shattering. Failure in any of these areas results in non-certification and disallows sale. The impact test is one of several assessments a line pipe undergoes for API certification.

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