Pressure Ratings of Steel Pipe
Based on ASTM A53 Grade B or A106 Grade B Seamless
ANSI 831.1, 1977 with allowances for connections and fittings
reduces
HAMMER
HAMMERthese working pressures approx. 25%
WORKING
FACTOR
FACTOR
PIPE
WORKING
7900
3500
BURST
NO.
BURST
1870
810
8463~
3000
1800
XXS
7200
9500
2070
XXS
XXS
6900
4780
6100
5300
4660
3560
2700
2100
2800
2000
1900
2090
2600
1600
160
80
40
1SCH.
20865PRESSURE-PSI
2500
1500
40
169
NO.
80
26.8
40
3850
22.3
4400
1100
160
3760
6A.3
*80
18.2
12.9
15.0
1.02
.738
.519
3800
4350
12300
10000
2300
4100
4800
1700
4500
6300
1500
2400
1030
2300
4200
3700
4100
3300
1800
4.0212
H80
XXS
36.1
160
2.60
10.9
80
1.67
40
2.08
2.92
12
1400
9.46
30.5
1.51
.422
160
8500
5700
1210
1300
3740
5.7410
36.9
.960
.666
.340
4600
160
8.60
SCH.
1.32
PRESSURE-PSI
4000
44.5
63.4
40
80
2.17
13.7
1.94
4.54
3.56
5.43
.244
.239
33~
2~
7300
.529
20.3
2.47
7.82
4.64
.385
1.49
.912
6.52
15,900
13,500
27,700
12,600
9,100
6,900
XXS
25,300
13,900
18,100
18,000
12,200
13,000
9,400
22,1
12,600
17,700
11,200
15,700
14,200
8,100
9,000
00
3452~·
25,000
22,300'
11,000
12,500
7,800
17,500
12,100
32,700
10,100
23,000
20,500
16,200
6,600
4,500
7,800
J40
.06
22,500
16,200
20,200
21,000
26,400
11,500
17,600
28,000
12,900
19,500
15,600
15,000
12,300
10,300
8,500
35,000
42,100
6,500
6,800
7,400
9,500
26,700
6,300
5,500
5,100
@40
1000
3,800
4,\00
PIPE
INCHES
NOM.
SIZE WATER
The allowable pressures were calculated by the formula
in the Code for Pressure Piping, ASA B31.1-1955, Section
3, par. 324(a),
25(t-C)
P=
D-2y(t-C)
where P = allowable.pressure in lb per sq in. (gauge)
S = allowable working stress in lb per sq ip..
D = outside diameter in inches
t= design thickness in inches, or 121/2% less than
the nominal thickness shown in the table
C = allowance in inches for corrosion ~d/ or
mechanical strength (C==O.05"hasbeen used above
for all pipe sizes)
y = a coefficient having values for feirriticsteels, as
follows:
0.4 up to and including 9000P
0.5 for 9500P
0.7 for 10000P and above
The allowable working stresses were obtained
from the Code for Pressure Piping, ASA B31.1.1-1955,
Table 12.
Hydraulic machinery piping is not covered by the
Code for Pressure Piping, but it is current practice to use
stresses comparable with those given for Refinery and
Oil TransportationPiping, Div. A. Theallowableworking
pressures at 1000P tabulated above accordingly may be
used, provided that water hammer or shock conditions
are considered by reducing these values by the product of
the flow rate in gallons per minute and the Water Hammer
Pactor tabulated above.
Thus if the flowrateis 100 gpmina 2"extra strong
line, the shock pressure created by water hammer is 100
x 6.52 = 652Ibs. per sq. in.; by deducting this from the
value of 2500 lb per sq in. shown in the table the allowable.
statiC'working pressure is found to be 1848lb per sq in.
Burst pressures for pipe were calculated using
formula
P=
Where
P
S
OD
t
25t
OD
=
=
=
=
internal burst pressure, psig
allowable stress (60,000 psi
outside diameter of tube in inches
nominal wall thickness
NOTES: ·Not extra strong. Schedule 60 is extra strong in this
size.
•• Notshedulenumberin
extra strong. Extra
this size!
stron!L
(lDof12"XSis
does not have
11.75
a
Inches)
@ Not standard weight. Standard wei~t does not
have a schedule number in this size! (lD of 12"
Standard is 12.00 Inches).
PE
Steel Pipe- ;S,ize, Schedule and Flow Rates
Standard Pipe - Schedule 40
00
1.315
31.9
41.8
61.9
159
2.718
155
117
26
5.4
FPS
5.563
4.000
12.0
3.0
.OBB
.B9
1.6
46.3
.35
1.2
15.0
250
300
7.625
627
2B.55
1B1
.301
GPM@
GPM@
GPM@
ID
13.5
2.B75
2.375
5.000
4.500
1.660
2GPM@
1.132
10
1.679
52.5
4.B
12.0
8.4
6FPS
310
263
23.8
12.7
63.7
79.7
1.9
67.7
210
21.0
199
997
797
2.273
93.7
.852
33.4
774
20
54.1
9.109
619
3.548
105
.133
40.6
157·
127
95.6
598
FPS
9.4
3.3
.533
.864
.304
FT
FPS
1249
.06B
.493
.091
.269
99.9
.B40
499
232
579
.567
.65
.540
12.54
6.0
116
463
B.1
6.5
.245
.057
.191
l.B
4.4
3.5
998
9.0
4.9
2.7
749
347
.258
1753
3.500
···3.068
75.0
3506
30.0
7012
5.793
8765
150
701
5259
225
·10.02
7.9B1
1235
6.625
10.75
B.625
1253
1567
452
607
783
1357
50.03
3033
2427
3134
28.89
1567
2262
40.48
3917
18.97
23.54
14.62
494
243
313
1~5
940
.322
1820
2350
38.74
WTI
AREA
WAll
..6.065
4.026
..23.4
1.049
2.067
1.050
399
1.495
46.8
622
16
27.0
3.653
9.5
B24
10.79
19.0
.203
.113
.154
.237··
70.3
25.1
FPS
.364
.405
.425
3.2
.675
.104
11.94
·.216
53.56
375
.406
7.393
·7.023
1213
313
6175
1810
2470
4940
904
20.01
3705
.280
1;610
1.380
.140
111.9
.365
78.85
1.900
9.886
12.73
15.95
.109
4.788
12.75
3.356
2.036
7.575
46~
2.469
.145
..16.7
247
2.26.
4.506
PIPE5.047
INT
WALL
.095
.432
.355
.318
.21B
.337
.147
.594
.500
.688
.191
.276
.200
.375
.300
.154
.179
.119
.126
Extra Strong Pipe - XS - Schedule 80
34.47
1225
360
55.3
310
83.0
11.50
26.07
679
855
720
138
696
139
180
11.1
114
13.6
1.087
7.3
1&
1.1
B.B
1/2
.88
1430
1080
9.562
6.625
7.625
2249
1591
64.40
71.81
38.05
43.39
45.66
2145
4774
3374
540
6365
2861
4498
2160
88.57
2699
636
450
216
286
12
10
207
278
453
570
1.278
1.500
22.5
92.5
2.900
3.364
816
3.826
4.290
4.813
11/2
1.939
20.0
21/2
31/2
1140
11.3
2.996
3.631
60.2
5.022
2.953
33.8
4.238
8.888
418
28.57
20.78
199
1.767
7.661
10.25
12.50
14.9B
540
1B.19
1132
41/2
27.7
46.2
66.4
905
265
80.3
45.0
185
414
557
408
1633
285
139
110
332
231
517
2041
900
103
226
41.4
55.7
72.0
90.5
26.5
18.5
163
4.5
234FPS
1.473
.433
20.3
.957
.742
6.B
3/4
.7
GPM@
GPM@
GPM@
PIPE
11.0
2FPS
1.1
2.2
4.4
10
.036
.535
3.4
6.6
11.0
.234
1.7
2&
3.7
20
.215
.57
2.3
1/8
.302
1/4
.423
2.2
.546
14.7
5.6
2.8
18.3
FT
3/8
.45
FPS
18.0
FPS
101.61
3182
1125
1620
715
5623
3576
7956
8'
40.1
11/4
2.323
5.761
133
1.283
6.605
17.61
14.45
56.3
1425
100
1765.5
.719'
27.1
33.9
WTI
AREA
.314
.072
.141
.738
&FPS
4.5
10
SIZE,
.23
11.37
2.171
INT
Double Extra Strong Pipe
Schedule 160 Pipe
.
5.563
10.75
6.625
1325
6.815
229
662
FPS
1.050
2.850
4.500
175
88.1
66.1
111
00
6.813
5.189
AREA
12.75
8.625
115.64
1.940
1144
1142
1777
331
4.24
2.67
10
.587
1.125
.271
1.70
45.30
5.34
8.49
17.0
458
915
1.71
14.61
3555
1656
6306
5045
21.15
4443
132
230
12.7
686
994
2666
.625
.718
33.0
ID
FT
504
355
PS
GPM@
1.315
1.660
1.900
8.17
.522
32.7·
6.62
33.1
16.3
66.2
40.8
82.8
.281
. 2FPS
2.125
2.375.343
3.500
2.875
22.0
55.5
35.1
7.450
58.2
22.2
5.416
339
145
424
9.283
8.81
44.0
70.2
140
291
582
14.30
22.52
14.0
170
.437
254
2;241
110
.375
436
105
20
WALL
1261
10.126
91.5
160.33
1.310
571
26
8.500
BB9
.466
1.312
.840
56.75
1.07
21.2
74.70
36.44
13.4
2384
10.7
2855
3784
.906
1713
8.01
FPS
80.53
FPS
GPM@
1.160
1.338
16.6
3.27
3.764
1.060
.250
24.5
49.7
2.626
1.689
3.438
.11.410
33.9
3.542
278
22~
10.01\
.531
167
4.313
.1B7
2623
.218
GPM@
WTI
84.8
727
4.862
INT
.552
.436
.864
.382
.308
.358
,600
.674
.750
1.000
.875
1.000
.•.400
294
WALL
2FPS
638.6
SIZE
GPM@
PIPE
1.714
55.6
14.9
9.029
6.9
83.4
9.2
2.3
116
2.300
195
260
4.897
4.063
·581
942
'22.1
203
81.2
295
233
377
118
568..
10.75
569
AREA
10
15
20
26
10
FT
FPS
FPS
FPS
GPM@
GPM@
GPM@
19.8
3.659
6.408
13.3
2.440
4.6
1.100
29.8
1.6
1.503
21/2
1.771
8.8
77.1
.282
29.6
2.4
.148
11/4
.599
4.4
.896
3.1
.434
17.7
9.9
39.5
.79
1/2
27.9
154
49.4
74.4
139
193
3.9
111
3/4
15.4
11.1
1.8
1"
4.0
.93
6.0
2.32
3.152
244
367
4.154
27.54
130
48B
122
26.0
3412
1883
6.875
5!lO
406
8.750
1180
38.55
609
53.16
72.42
104.1
60.13
2825
1015
18.83
37.12
2325
3767
1475
1421
90.76
4264
125.5
5686
7107
WTI
5.214
.630
44.6
.050
13.70
2.463
11.6
11/2
1.774
59.5
.950
.252
18.58
7.803
65.1
325
611
48.9
1163
885
1744
12.97
812
2907
4709
10
2843
INT