A335 P9 Pipe MAWP Calculator

ASTM A335 -P9 Alloy Steel Pipe SMLS 9Cr-1Mo

Pressure Ratings > Pipe MAWP > A335 P9

Material Properties

Specification

A335 P9

Description

ASTM A335 -P9 Alloy Steel Pipe SMLS 9Cr-1Mo

Tensile Strength

60 ksi

Yield Strength

30 ksi

B16.5 Flange Group

Group 1.14 — Alloy Steel 9Cr-1Mo

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	6,027	5,794	5,727	5,694	5,594	5,427	5,128
1/4	0.54	6,438	5,827	5,601	5,537	5,505	5,408	5,247	4,957
3/8	0.675	5,210	4,715	4,533	4,481	4,455	4,377	4,246	4,012
1/2	0.84	4,995	4,521	4,346	4,296	4,271	4,196	4,071	3,846
3/4	1.05	4,074	3,687	3,544	3,503	3,483	3,422	3,320	3,137
1	1.315	3,810	3,448	3,314	3,276	3,257	3,200	3,105	2,933
1 1/4	1.66	3,137	2,839	2,729	2,698	2,682	2,635	2,557	2,415
1 1/2	1.9	2,822	2,554	2,455	2,427	2,413	2,370	2,300	2,173
2	2.375	2,377	2,152	2,068	2,045	2,033	1,997	1,938	1,831
2 1/2	2.875	2,600	2,353	2,262	2,236	2,223	2,184	2,119	2,002
3	3.5	2,258	2,043	1,964	1,941	1,930	1,896	1,840	1,738
3.5	4	2,059	1,863	1,791	1,771	1,760	1,730	1,678	1,585
4	4.5	1,914	1,732	1,665	1,646	1,636	1,608	1,560	1,474
5	5.563	1,678	1,518	1,460	1,443	1,434	1,409	1,367	1,292
6	6.625	1,524	1,380	1,326	1,311	1,303	1,280	1,242	1,174
7	7.625	1,421	1,286	1,236	1,222	1,215	1,194	1,158	1,094
8	8.625	1,342	1,214	1,167	1,154	1,147	1,127	1,094	1,033
9	9.625	1,275	1,154	1,110	1,097	1,090	1,071	1,039	982
10	10.75	1,217	1,102	1,059	1,047	1,041	1,023	992	937
12	12.75	1,051	951	914	904	899	883	857	809
14	14	955	865	831	822	817	803	779	736
16	16	834	755	726	717	713	701	680	642
18	18	740	670	644	636	633	622	603	570
20	20	665	602	579	572	569	559	542	512
22	22	604	546	525	519	516	507	492	465
24	24	553	500	481	476	473	464	451	426
26	26	510	462	444	439	436	428	416	393
28	28	473	428	412	407	405	397	386	364
30	30	441	399	384	380	377	371	360	340
36	36	367	332	320	316	314	308	299	283
42	42	314	285	274	270	269	264	256	242
44	44	300	272	261	258	257	252	245	231
46	46	287	260	250	247	245	241	234	221
48	48	275	249	239	236	235	231	224	212

Custom Wall Thickness

NPS

Wall Thickness (in)

Allowable Stress vs Temperature

Matching Flange Group

Group 1.14 — Alloy Steel 9Cr-1Mo(A182 F9, A217 C12)

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.