from Machinery's Handbook, 1924

Bursting and Working Pressures for Pipes

Bursting pressure of pipes may be determined approximately with Barlow's formula:
P = 2 (T x S) / O

where P is pressure in pounds per square inch, T is thickness of wall in inches, O is outside diameter in inches, and S is tensile strength of material in pounds per square inch (40,000 psi for butt-welded steel pipe, and 50,000 psi for lap-welded steel pipe). The table below gives bursting and working pressures for pipes, given with safety factors of 6, 8, and 10 for the working pressures.

Yes, I noticed the jumps. My deduction is that different ranges of pipe sizes use different thicknesses of steel.


size
inches		Bursting
Pressure 		Working Pressure
Safety Factor
6810
1/4"13032217216291303
3/8"10784179713481078
1/2"10384173112981038
3/4"860814341076860
1"808813481011808
1-1/467441124843674
1-1/261041017763610
25184864648518
2-1/25648941706564
34936823617493
3-1/25610935701561
45266877658526
4-1/24940823618494
54630772579463
64220703528422
73940657493394
83730622466373
93550591444355
103390656424339
122940490368294
extra strong
1/417624293722031762
3/814928248818661492
1/214000233317501400
3/411728195417161172
110888181416111088
1-1/4920015331150920
1-1/2841614031052841
273361223917733
2-1/276801280960768
368561142857685
3-1/279501325994795
474801246935748
4-1/271001183887710
567401123842674
665501091819655
765201086815652
85780963722578
95190865649519
104650775581465
123920653490392
double extra strong
1/228000466635002800
3/423464391029332346
121776362927222177
1-1/418408306823011840
1-1/216840280721051684
215360256019201536
2-1/214680244718351468
313714228517141371
3-1/215900265019871590
414970249518711497
4-1/214200236717751420
513480224716851348
613040217316301304
711470191214341147
810140169012671014

Comments: ebear@zianet.com

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