A335 P11 Pipe MAWP Calculator

ASTM A335 -P11 Alloy Steel Pipe SMLS 1 1/4Cr-1/2Mo-Si

Pressure Ratings > Pipe MAWP > A335 P11

Material Properties

Specification

A335 P11

Description

ASTM A335 -P11 Alloy Steel Pipe SMLS 1 1/4Cr-1/2Mo-Si

Tensile Strength

60 ksi

Yield Strength

30 ksi

B16.5 Flange Group

Group 1.9 — Alloy Steel 1¼Cr-½Mo

Min Design Temperature

-20 °F

Y Coefficient

Ref 3 — Ferritic steels

Calculator Settings

Corrosion Allowance (in)

Mill Tolerance (%)

Units

Schedule Selection

STDXSXXS10S40S80S2030406080120140160

Temperature Selection

100 °F150 °F200 °F250 °F300 °F350 °F400 °F450 °F500 °F550 °F600 °F650 °F700 °F750 °F800 °F850 °F900 °F950 °F1000 °F1050 °F1100 °F1150 °F1200 °F

Maximum Allowable Working Pressure (psig)

NPS	OD (in)	100 °F	200 °F	300 °F	400 °F	500 °F	600 °F	700 °F	800 °F
1/8	0.405	6,659	6,160	5,860	5,594	5,394	5,227	5,028	4,795
1/4	0.54	6,438	5,955	5,666	5,408	5,215	5,054	4,861	4,635
3/8	0.675	5,210	4,819	4,585	4,377	4,220	4,090	3,934	3,751
1/2	0.84	4,995	4,621	4,396	4,196	4,046	3,921	3,772	3,597
3/4	1.05	4,074	3,768	3,585	3,422	3,300	3,198	3,076	2,933
1	1.315	3,810	3,524	3,352	3,200	3,086	2,991	2,876	2,743
1 1/4	1.66	3,137	2,902	2,761	2,635	2,541	2,463	2,368	2,259
1 1/2	1.9	2,822	2,610	2,483	2,370	2,286	2,215	2,130	2,032
2	2.375	2,377	2,199	2,092	1,997	1,926	1,866	1,795	1,712
2 1/2	2.875	2,600	2,405	2,288	2,184	2,106	2,041	1,963	1,872
3	3.5	2,258	2,088	1,987	1,896	1,829	1,772	1,704	1,625
3.5	4	2,059	1,905	1,812	1,730	1,668	1,616	1,554	1,482
4	4.5	1,914	1,770	1,684	1,608	1,550	1,502	1,445	1,378
5	5.563	1,678	1,552	1,476	1,409	1,359	1,317	1,267	1,208
6	6.625	1,524	1,410	1,341	1,280	1,235	1,197	1,151	1,098
7	7.625	1,421	1,314	1,250	1,194	1,151	1,115	1,073	1,023
8	8.625	1,342	1,241	1,181	1,127	1,087	1,053	1,013	966
9	9.625	1,275	1,180	1,122	1,071	1,033	1,001	963	918
10	10.75	1,217	1,126	1,071	1,023	986	956	919	876
12	12.75	1,051	972	925	883	851	825	794	757
14	14	955	884	841	803	774	750	721	688
16	16	834	771	734	701	676	655	630	600
18	18	740	684	651	622	599	581	559	533
20	20	665	615	585	559	539	522	502	479
22	22	604	559	531	507	489	474	456	435
24	24	553	511	487	464	448	434	417	398
26	26	510	472	449	428	413	400	385	367
28	28	473	438	416	397	383	371	357	341
30	30	441	408	388	371	358	346	333	318
36	36	367	340	323	308	297	288	277	264
42	42	314	291	277	264	255	247	237	226
44	44	300	278	264	252	243	236	227	216
46	46	287	265	253	241	232	225	217	207
48	48	275	254	242	231	223	216	208	198

Custom Wall Thickness

NPS

Wall Thickness (in)

Allowable Stress vs Temperature

Matching Flange Group

Group 1.9 — Alloy Steel 1¼Cr-½Mo(A182 F11 Cl.2, A217 WC6, A387-11)

Disclaimer: This calculator is for guidance only. Results are based on ASME B31.3-2024 allowable stresses for seamless pipe (Ej=1.0, W=1.0). Always verify against the current edition of the standard. The engineer of record is responsible for all design decisions.