A312 TP304 Pipe MAWP Calculator

ASTM A312 TP304 SS Pipe Smls 18Cr-8Ni

Pressure Ratings > Pipe MAWP > A312 TP304

Material Properties

Specification

A312 TP304

Description

ASTM A312 TP304 SS Pipe Smls 18Cr-8Ni

Tensile Strength

75 ksi

Yield Strength

30 ksi

B16.5 Flange Group

Group 2.1 — Austenitic SS 18Cr-8Ni

Min Design Temperature

-425 °F

Y Coefficient

Ref 4 — Austenitic 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 °F1250 °F1300 °F1350 °F1400 °F1450 °F1500 °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	6,659	6,659	6,193	5,827	5,527	5,261	5,061
1/4	0.54	6,438	6,438	6,438	5,987	5,633	5,344	5,086	4,893
3/8	0.675	5,210	5,210	5,210	4,845	4,559	4,324	4,116	3,960
1/2	0.84	4,995	4,995	4,995	4,646	4,371	4,146	3,946	3,797
3/4	1.05	4,074	4,074	4,074	3,788	3,564	3,381	3,218	3,096
1	1.315	3,810	3,810	3,810	3,543	3,333	3,162	3,010	2,895
1 1/4	1.66	3,137	3,137	3,137	2,917	2,745	2,604	2,478	2,384
1 1/2	1.9	2,822	2,822	2,822	2,624	2,469	2,342	2,229	2,145
2	2.375	2,377	2,377	2,377	2,211	2,080	1,973	1,878	1,807
2 1/2	2.875	2,600	2,600	2,600	2,418	2,275	2,158	2,054	1,976
3	3.5	2,258	2,258	2,258	2,099	1,975	1,874	1,783	1,716
3.5	4	2,059	2,059	2,059	1,915	1,802	1,709	1,627	1,565
4	4.5	1,914	1,914	1,914	1,780	1,675	1,589	1,512	1,455
5	5.563	1,678	1,678	1,678	1,560	1,468	1,392	1,325	1,275
6	6.625	1,524	1,524	1,524	1,418	1,334	1,265	1,204	1,159
7	7.625	1,421	1,421	1,421	1,321	1,243	1,179	1,123	1,080
8	8.625	1,342	1,342	1,342	1,248	1,174	1,114	1,060	1,020
9	9.625	1,275	1,275	1,275	1,186	1,116	1,059	1,008	969
10	10.75	1,217	1,217	1,217	1,132	1,065	1,010	962	925
12	12.75	1,051	1,051	1,051	977	920	872	830	799
14	14	955	955	955	889	836	793	755	726
16	16	834	834	834	776	730	692	659	634
18	18	740	740	740	688	647	614	585	562
20	20	665	665	665	618	582	552	525	505
22	22	604	604	604	562	528	501	477	459
24	24	553	553	553	514	484	459	437	420
26	26	510	510	510	474	446	423	403	388
28	28	473	473	473	440	414	393	374	360
30	30	441	441	441	410	386	366	349	335
36	36	367	367	367	342	321	305	290	279
42	42	314	314	314	292	275	261	248	239
44	44	300	300	300	279	263	249	237	228
46	46	287	287	287	267	251	238	227	218
48	48	275	275	275	256	241	228	217	209

Custom Wall Thickness

NPS

Wall Thickness (in)

Allowable Stress vs Temperature

Matching Flange Group

Group 2.1 — Austenitic SS 18Cr-8Ni(A182 F304/F304H, A351 CF3/CF8, A240-304/304H)

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.