When selecting API 5L line pipe for oil, gas, water, or slurry transmission projects, understanding pipe sizes and schedule classifications is one of the most critical steps in the procurement process. Pipe size and schedule directly affect pressure rating, wall thickness, mechanical strength, welding performance, and overall project safety. Here's an overview of API 5L pipe sizes and schedule chart.
|
Outside Diameter
O.D. (in)
|
NPS
(in)
|
Pipe Schedule
|
|
SCH 10
|
SCH 20
|
SCH 30
|
SCH STD
|
SCH 40
|
SCH 60
|
SCH XS
|
SCH 80
|
SCH 100
|
SCH 120
|
SCH 140
|
SCH 160
|
SCH XXS
|
|
Wall Thickness (in)
|
|
0.405
|
1/8
|
|
|
|
0.068
|
0.068
|
|
0.095
|
0.095
|
|
|
|
|
|
|
0.540
|
1/4
|
|
|
|
0.088
|
0.088
|
|
0.119
|
0.119
|
|
|
|
|
|
|
0.675
|
3/8
|
|
|
|
0.091
|
0.091
|
|
0.126
|
0.126
|
|
|
|
|
|
|
0.840
|
1/2
|
|
|
|
0.109
|
0.109
|
|
0.147
|
0.147
|
|
|
|
0.187
|
0.294
|
|
1.050
|
3/4
|
|
|
|
0.113
|
0.113
|
|
0.154
|
0.154
|
|
|
|
0.219
|
0.308
|
|
1.315
|
1
|
|
|
|
0.133
|
0.133
|
|
0.179
|
0.179
|
|
|
|
0.250
|
0.358
|
|
1.660
|
1 1/4
|
|
|
|
0.140
|
0.140
|
|
0.191
|
0.191
|
|
|
|
0.250
|
0.382
|
|
1.900
|
1 1/2
|
|
|
|
0.145
|
0.145
|
|
0.200
|
0.200
|
|
|
|
0.281
|
0.400
|
|
2.375
|
2
|
|
|
|
0.154
|
0.154
|
|
0.218
|
0.218
|
|
|
|
0.344
|
0.436
|
|
2.875
|
2 1/2
|
|
|
|
0.203
|
0.203
|
|
0.276
|
0.276
|
|
|
|
0.375
|
0.552
|
|
3.500
|
3
|
|
|
|
0.216
|
0.216
|
|
0.300
|
0.300
|
|
|
|
0.438
|
0.600
|
|
4.000
|
3 1/2
|
|
|
|
0.226
|
0.226
|
|
0.318
|
0.318
|
|
|
|
|
|
|
4.500
|
4
|
|
|
|
0.237
|
0.237
|
|
0.337
|
0.337
|
|
0.438
|
|
0.531
|
0.674
|
|
5.563
|
5
|
|
|
|
0.258
|
0.258
|
|
0.375
|
0.375
|
|
0.500
|
|
0.625
|
0.750
|
|
6.625
|
6
|
|
|
|
0.280
|
0.280
|
|
0.432
|
0.432
|
|
0.562
|
|
0.719
|
0.864
|
|
8.625
|
8
|
|
0.250
|
0.277
|
0.322
|
0.322
|
0.406
|
0.500
|
0.500
|
0.594
|
0.719
|
0.812
|
0.906
|
0.875
|
|
10.750
|
10
|
|
0.250
|
0.307
|
0.365
|
0.365
|
0.500
|
0.500
|
0.594
|
0.719
|
0.844
|
1.000
|
1.125
|
1.000
|
|
12.750
|
12
|
|
0.250
|
0.330
|
0.375
|
0.406
|
0.562
|
0.500
|
0.688
|
0.844
|
1.000
|
1.125
|
1.312
|
1.000
|
|
14.000
|
14
|
0.250
|
0.312
|
0.375
|
0.375
|
0.438
|
0.594
|
0.500
|
0.750
|
0.938
|
1.094
|
1.250
|
1.406
|
|
|
16.000
|
16
|
0.250
|
0.312
|
0.375
|
0.375
|
0.500
|
0.656
|
0.500
|
0.844
|
1.031
|
1.219
|
1.438
|
1.594
|
|
|
18.000
|
18
|
0.250
|
0.312
|
0.438
|
0.375
|
0.562
|
0.750
|
0.500
|
0.938
|
1.156
|
1.375
|
1.562
|
1.781
|
|
|
20.000
|
20
|
0.250
|
0.375
|
0.500
|
0.375
|
0.594
|
0.812
|
0.500
|
1.031
|
1.281
|
1.500
|
1.750
|
1.969
|
|
|
22.000
|
22
|
0.250
|
0.375
|
0.500
|
0.375
|
|
0.875
|
0.500
|
1.125
|
1.375
|
1.625
|
1.875
|
2.125
|
|
|
24.000
|
24
|
0.250
|
0.375
|
0.562
|
0.375
|
0.688
|
0.969
|
0.500
|
1.219
|
1.531
|
1.812
|
2.062
|
2.344
|
|
|
30.000
|
30
|
0.312
|
0.500
|
0.625
|
0.375
|
|
|
0.500
|
|
|
|
|
|
|
|
32.000
|
32
|
0.312
|
0.500
|
0.625
|
0.375
|
0.688
|
|
|
|
|
|
|
|
|
|
34.000
|
34
|
0.312
|
0.500
|
0.625
|
0.375
|
0.688
|
|
|
|
|
|
|
|
|
|
36.000
|
36
|
0.312
|
0.500
|
0.625
|
0.375
|
0.750
|
|
|
|
|
|
|
|
|
|
42.000
|
42
|
|
0.500
|
0.625
|
0.375
|
0.750
|
|
|
|
|
|
|
|
|
|
Pipe NPS
|
Schedule No
|
Outside Diameter, Inches
|
Wall Thickness, inches
|
Plain End Weight, lb/ft
|
Outside Diameter, mm
|
Wall Thickness, mm
|
Plain End Mass, Kg/m
|
|
1/8
|
40/STD
|
0.405 Inches
|
0.068 Inches
|
0.24
|
10.3 mm
|
1.73 mm
|
0.37 Kg/m
|
|
1⁄4
|
40/STD
|
0.540 Inches
|
0.088 Inches
|
0.43
|
13.7 mm
|
2.24 mm
|
0.63 Kg/m
|
|
3⁄8
|
40/STD
|
0.675 Inches
|
0.091 Inches
|
0.57
|
17.1 mm
|
2.31 mm
|
0.84 Kg/m
|
|
1⁄2
|
40/STD
|
0.840 Inches
|
0.109 Inches
|
0.85
|
21.3 mm
|
2.77 mm
|
1.27 Kg/m
|
|
3⁄4
|
40/STD
|
1.050 Inches
|
0.113 Inches
|
1.13
|
26.7 mm
|
2.87 mm
|
1.69 Kg/m
|
|
1
|
40/STD
|
1.315 Inches
|
0.133 Inches
|
1.68
|
33.4 mm
|
3.38 mm
|
2.50 Kg/m
|
|
1-1⁄4
|
40/STD
|
1.660 Inches
|
0.140 Inches
|
2.27
|
42.2 mm
|
3.56 mm
|
3.39 Kg/m
|
|
1-1⁄2
|
40/STD
|
1.900 Inches
|
0.145 Inches
|
2.72
|
48.3 mm
|
3.68 mm
|
4.05 Kg/m
|
|
2
|
40/STD
|
2.375 Inches
|
0.154 Inches
|
3.66
|
60.3 mm
|
3.91 mm
|
5.44 Kg/m
|
|
2-1⁄2
|
40/STD
|
2.875 Inches
|
0.203 Inches
|
5.80
|
73.0 mm
|
5.16 mm
|
8.63 Kg/m
|
|
3
|
40/STD
|
3.500 Inches
|
0.216 Inches
|
7.58
|
88.9 mm
|
5.49 mm
|
11.29 Kg/m
|
|
4
|
40/STD
|
4.500 Inches
|
0.237 Inches
|
10.80
|
114.3 mm
|
6.02 mm
|
16.08 Kg/m
|
|
5
|
40/STD
|
5.563 Inches
|
0.258 Inches
|
14.63
|
141.3 mm
|
6.55 mm
|
21.77 Kg/m
|
|
6
|
40/STD
|
6.625 Inches
|
0.280 Inches
|
18.99
|
168.3 mm
|
7.11 mm
|
28.26 Kg/m
|
|
8
|
40/STD
|
8.625 Inches
|
0.322 Inches
|
28.58
|
219.1 mm
|
8.18 mm
|
42.55 Kg/m
|
|
10
|
40/STD
|
10.750 Inches
|
0.365 Inches
|
40.52
|
273.0 mm
|
9.27 mm
|
60.29 Kg/m
|
|
12
|
40
|
12.750 Inches
|
0.406 Inches
|
53.57
|
323.8 mm
|
10.31 mm
|
79.71 Kg/m
|
|
14
|
40
|
14.000 Inches
|
0.438 Inches
|
63.50
|
355.6 mm
|
11.13 mm
|
94.55 Kg/m
|
|
16
|
40
|
16.000 Inches
|
0.500 Inches
|
82.85
|
406.4 mm
|
12.70 mm
|
123.31 Kg/m
|
|
18
|
40
|
18.000 Inches
|
0.562 Inches
|
104.76
|
457 mm
|
14.27 mm
|
155.81 Kg/m
|
|
20
|
40
|
20.000 Inches
|
0.594 Inches
|
123.23
|
508 mm
|
15.09 mm
|
183.43 Kg/m
|
|
24
|
40
|
24.000 Inches
|
0.688 Inches
|
171.45
|
610 mm
|
17.48 mm
|
255.43 Kg/m
|
|
32
|
40
|
32.000 Inches
|
0.688 Inches
|
230.29
|
813 mm
|
17.48 mm
|
342.94 Kg/m
|
|
34
|
40
|
34.000 Inches
|
0.688 Inches
|
245.00
|
864 mm
|
17.48 mm
|
364.92 Kg/m
|
|
36
|
40
|
36.000 Inches
|
0.750 Inches
|
282.62
|
914 mm
|
19.05 mm
|
420.45 Kg/m
|
FAQ – API 5L Pipe Sizes and Schedule Chart
1. What does “schedule” mean in API 5L pipes?
Schedule (SCH) refers to the wall thickness classification of the pipe. A higher schedule number indicates a thicker wall and higher pressure-bearing capacity, while the outside diameter remains constant for the same NPS.
2. What are the most commonly used schedules for API 5L line pipes?
For most oil and gas transmission projects, commonly used schedules include SCH 10, SCH 20, SCH 30, SCH 40, SCH 60, and SCH 80. Heavier schedules such as SCH 100 or SCH 160 are used for high-pressure or special service conditions.
3. Is API 5L pipe size measured by outside diameter or nominal size?
API 5L pipes are specified by Nominal Pipe Size (NPS), which is a standardized designation. The actual outside diameter is fixed for each NPS, while the wall thickness varies by schedule.
4. Does API 5L define pipe schedules directly?
API 5L focuses on material grades, manufacturing processes, mechanical properties, and quality requirements. Pipe schedules and wall thickness dimensions are typically referenced from ASME B36.10M or ASME B36.19M, which are used alongside API 5L.
5. How do I choose the right schedule for an API 5L pipeline project?
Schedule selection depends on several factors, including design pressure, operating temperature, transported medium, corrosion allowance, installation environment, and applicable design codes. Engineering calculations should always be performed to confirm the minimum required wall thickness.
6. Are pipe sizes and schedules the same for seamless and welded API 5L pipes?
Yes, NPS and schedule dimensions are standardized and apply to both seamless and welded API 5L pipes. However, availability and maximum wall thickness may vary depending on the manufacturing method.
English
Español
Tel : +86-18565811709
Email : 
News
