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TECH SHEET -
PROPER PIPE SIZING

Selecting the proper wall thickness is critical for safety. No longer is ultimate burst strength sufficient for determining the suitability of the pipe.

Below you will find a chart of safe working pressures for the common sizes from 0.375" through 4.00" in the different grades and schedules which are available. Please note that there are various conditions such as bending, threading, etc. that will downrate the safe working pressure. The formula for downrating pipe is found in A.S.M.E. B 31.1. Article Safe Working Pressure Using ASME. Also keep in mind that allowances for mechanical wear and erosion may be necessary, depending on operating conditions oultined in this article.

A.S.M.E. B31. 1. Safe Working Pressures
A.S.T.M. A106 Grades B & C Seamless Pipe

Nominal Size
(inches)
Pressure (P.S.I.) Flow in Gallons / Mi @
A106B A106C 15'/sec 20'/sec 25'/sec
0.375 SCH 40 3907 4464 8 11 14
SCH 80 5636 6574 6 8 10
0.50 SCH 40 3746 4370 14 18 23
SCH 80 5235 6106 10 14 18
SCH 160 6922 8075 7 10 13
SCH XXH 12168 14195 2 3 3
0.75 SCH 40 3055 3563 24 33 41
SCH 80 4290 5005 20 26 33
SCH 160 6376 7439 13 18 23
SCH XXH 9689 11303 6 9 11
1.00 SCH 40 2857 3333 40 53 67
SCH 80 3949 4607 33 44 56
SCH 160 5756 6715 24 32 40
SCH XXH 8828 10299 13 17 21
1.25 SCH 40 2352 2744 69 93 116
SCH 80 3284 3833 60 80 100
SCH 160 4419 5155 49 65 82
SCH XXH 7200 8400 29 39 49
1.50 SCH 40 2116 2468 95 126 158
SCH 80 2982 3480 82 110 137
SCH 160 4330 5051 65 87 109
SCH XXH 6481 7561 44 59 74
2.00 SCH 40 1783 2080 155 207 259
SCH 80 2574 3004 137 183 229
SCH 160 4217 4920 104 139 174
SCH XXH 5529 6450 82 110 138
2.50 SCH 40 1949 2274 223 298 372
SCH 80 2701 3151 198 264 330
SCH 160 3767 4395 165 220 276
SCH XXH 5822 6792 129 173 216
3.00 SCH 40 1693 1975 345 460 575
SCH 80 2393 2792 308 411 514
SCH 160 3591 4189 253 337 421
SCH XXH 5113 5965 194 258 323
3.50 SCH 40 1544 1801 461 615 769
SCH 80 2209 2577 415 553 692
SCH XXH 4696 5479 273 364 455
4.00 SCH 40 1435 1674 594 793 991
SCH 80 2074 2420 537 716 895
SCH 160 3376 3938 433 578 722
SCH XXH 4392 5124 364 486 607

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