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P11 Pipe Specification

This document provides pressure and temperature ratings for plain end seamless chromium-molybdenum alloy steel pipe that meets ASTM A335 Grade P11 specifications. It lists allowable stresses and maximum working pressures for various pipe sizes, schedules, and wall thicknesses at temperatures ranging from 20 to 1050 degrees Fahrenheit. The note indicates that economics generally limit use to a maximum temperature of 1050F and that test pressures for inspection may differ from maximum working pressures.

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663 views2 pages

P11 Pipe Specification

This document provides pressure and temperature ratings for plain end seamless chromium-molybdenum alloy steel pipe that meets ASTM A335 Grade P11 specifications. It lists allowable stresses and maximum working pressures for various pipe sizes, schedules, and wall thicknesses at temperatures ranging from 20 to 1050 degrees Fahrenheit. The note indicates that economics generally limit use to a maximum temperature of 1050F and that test pressures for inspection may differ from maximum working pressures.

Uploaded by

S.KAMBAN
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Pressure – Temperature Ratings of Plain End

Seamless chromium – Molybdenum Alloy Steel Pipe


to ASTM A335 Grade P11
(1 ¼ % CHROMIUM – ½% MOLYBDENUM)
TEMPERATURE, DEGREES F. 20 to 850 900 950 1,000 1,050
800
ALLOWABLE STRESS “S” PSI 15,000 14,400 13,100 11,000 6,600 4,100
PIPE SCHEDU WALL WALL
SIZE LE DESIG- THICK-
MAXIMUM WORKING PRESSURE, PSI
INCHES NUMBER NATION NESS
INCHES
½ 40 STD 0.109 3730 3581 3258 2805 1774 1102
80 XS 0.147 5252 5042 4587 3992 2582 1604
(0.840) 160 – 0.188 6920 6643 6043 5378 3576 2222
- XXS 0.294 11073 10630 9670 9698 7065 4389
¾ 40 STD 0.113 3059 2937 2672 2290 1434 891
80 XS 0.154 4299 4127 3755 3246 2070 1286
(1.050) 160 - 0.219 6393 6137 5583 4923 3244 2015
- XXS 0.308 9273 8903 8099 7615 5304 3295
40 STD 0.133 2847 2733 2487 2128 1328 825
1 80 XS 0.179 3960 3802 3458 2983 1892 1175
(1.315) 160 - 0.250 5764 5534 5034 4396 2867 1781
- XXS 0.358 8538 8197 7457 6872 4712 2927
40 STD 0.140 2363 2268 2064 1761 1091 678
1¼ 80 XS 0.191 3282 3151 2866 2461 1546 960
(1.660) 160 - 0.250 4425 4248 3864 3344 2136 1327
- XXS 0.382 7106 6821 6206 5541 3697 2297
40 STD 0.145 2119 2034 1850 1576 973 605
1½ 80 XS 0.200 2983 2864 2605 2232 1396 867
(1.900) 160 - 0.281 4333 4160 3784 3272 2087 1297
- XXS 0.400 6446 6188 5629 4968 3277 2035
40 STD 0.154 1787 1715 1560 1326 815 506
2 80 XS 0.218 2579 2475 2252 1924 1196 743
(2.375) 160 - 0.344 4231 4062 3695 3193 2034 1263
- XXS 0.436 5538 5316 4836 4217 2740 1702
40 STD 0.203 1954 1876 1707 1452 895 556
2½ 80 XS 0.276 2708 2599 2365 2022 1260 782
(2.875) 160 - 0.375 3766 3616 3289 2833 1792 1113
- XXS 0.552 5820 5588 5083 4442 2900 1801
40 STD 0.216 1693 1625 1479 1256 771 479
3 80 XS 0.300 2398 2303 2095 1787 1108 689
(3.500) 160 - 0.438 3598 3454 3142 2703 1706 1060
- XXS 0.600 5114 4909 4466 3882 2506 1157
3½ 40 STD 0.226 1546 1484 1350 1146 702 436
(4.000) 80 XS 0.138 2208 2119 1928 1643 1016 631
40 STD 0.237 1433 1375 1251 1061 649 403
80 XS 0.337 2076 1992 1813 1543 953 592
4 120 - 0.438 2740 2630 2393 2047 1275 792
(4.500) 160 - 0.531 3379 3244 2951 2535 1595 991
- XXS 0.674 4394 4218 3838 3320 2120 1317

NOTE :
1. Economics and general practice dictate a maximum temperature range of 1050F.
2. Max working pressure refered in the table need not be considered for testing the pipes during inspection at supplier works. Refer ASTM
standards for more details regarding test pressure.

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