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"Technical Conditions for Delivery of Steel Pipes for Oil and Gas Industry" Part I: Steel grade comparison table specified in Grade A steel pipe ( GB/T9711.1 ) and ANSI/API Spec 5L[1] :
Steel grade ( GB/T9711.1 )
L175 (Class I, II)
L210
L245
L290
L320
L360
L390
L415
L450
L485
L555
Steel grade ( ANSI/API Spec 5L[1] )
A25 (Class I, II)
A
B
X42
X46
X52
X56
X60
X65
X70
X80
Specifies the total elongation stress Rt0.5 ( min ) Mpa
175
210
245
290
320
360
390
415
450
485
555
tensile strength ( min ) Mpa
315
335
415
415
435
460
490
520
535
570
625
Second, the steel pipe size weight
Calculation formula for the weight of unthreaded steel pipe:
M = 0.024 661 5 ( DT ) T
Where: M - unthreaded steel pipe unit length weight kg / m ;
D —outer diameter mm ;
T — steel pipe wall thickness mm ;
The density used in the coefficients is 7.85 kg/dm3 .
Weight per unit length ( kg/m )
Third, the determination of wall thickness
Wall thickness
( mm )
5
6
7
8
Wall thickness tolerance
+15
5.75
6.9
8.05
9.2
-12.5
4.375
5.25
6.125
7
Outer diameter
( mm )
219
26.39
31.52
36.60
41.63
273
33.05
39.51
45.92
52.28
325
39.46
47.20
54.90
62.54
426
51.91
62.15
72.33
82.47
The gas pipeline is calculated by the following formula:
Where: d ─ steel pipe calculation wall thickness (mm);
P ─ design pressure (MPa);
D ─ outer diameter of steel pipe (mm);
s s - the minimum yield strength of the steel pipe (MPa);
F ─ strength design factor;
j ─ weld coefficient, take 1.0;
t ─ temperature reduction factor, taken as 1.0;
Wall thickness calculation table (mm)
Regional category
Pipe outer diameter
( mm )
design pressure
( MPa )
Town lighting design specification
Gas pipeline engineering design specification
Pipe steel grade
Pipe steel grade
X42
X52
X42
X52
Three types of areas
325
2.5
3.50
2.82
3.0
4.20
3.81
3.36
2.71
4.0
5.60
4.51
426
2.5
4.59
3.70
3.0
5.51
4.44
4.41
3.55
4.0
7.34
5.92
508
2.5
5.47
4.41
3.0
6.57
5.29
5.26
4.23
4.0
8.76
7.06
7.01
5.65
Four types of areas
325
2.5
4.67
3.76
3.50
2.82
3.0
5.60
4.51
4.20
3.39
4.0
7.47
6.02
5.60
4.51
426
2.5
6.12
4.93
4.59
3.70
3.0
7.34
5.92
5.51
4.44
4.0
9.79
7.89
7.34
5.92
508
2.5
7.30
5.88
5.47
4.41
3.0
8.76
7.06
6.57
5.29
4.0
11.68
9.41
8.76
7.06
Note: 1. The design code for urban gas design stipulates that the strength design coefficient of the three types of areas is 0.4, and that of the four types of areas is 0.3;
2. The gas pipeline engineering design specification stipulates that the strength design coefficient of the three types of areas is 0.5, and that of the four types of areas is 0.4. 