Copper – Internal Working Pressure Type M*

Calculated Rated Internal Working Pressure for Copper Tube: Type M*

Nominal or standard size, in inches	Annealed***
	S= 6000 psi 100F	S= 5100 psi 150F	S= 4900 psi 200F	S= 4800 psi 250F
1/4	—	—	—	—
3/8	570	485	466	456
1/2	494	420	403	395
5/8	—	—	—	—
3/4	407	346	332	326
1	337	286	275	270
1-1/4	338	287	276	271
1-1/2	331	282	270	265
2	299	254	244	239
2-1/2	274	233	224	219
3	253	215	207	203
3-1/2	252	214	206	202
4	251	213	205	201
5	233	198	190	186
6	218	186	178	175
8	229	195	187	183
10	230	195	188	184
12	230	195	188	184

Nominal or standard size, in inches	Annealed***
	S= 4700 psi 300F	S= 4000 psi 350F	S= 3000 psi 400F
1/4	—	—	—
3/8	447	380	285
1/2	387	329	247
5/8	—	—	—
3/4	319	271	204
1	264	225	169
1-1/4	265	225	169
1-1/2	259	221	166
2	234	199	149
2-1/2	215	183	137
3	199	169	127
3-1/2	197	168	126
4	197	167	126
5	182	155	116
6	171	146	109
8	180	153	115
10	180	153	115
12	180	153	115

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Nominal or standard size, in inches	Drawn**
	S= 10,300 psi 100F	S= 10,300 psi 150F	S= 10,300 psi 200F	S= 10,300 psi 250F
1/4	—	—	—	—
3/8	982	982	982	982
1/2	850	850	850	850
5/8	—	—	—	—
3/4	701	701	701	701
1	580	580	580	580
1-1/4	582	582	582	582
1-1/2	569	569	569	569
2	514	514	514	514
2-1/2	471	471	471	471
3	435	435	435	435
3-1/2	433	433	433	433
4	431	431	431	431
5	400	400	400	400
6	375	375	375	375
8	394	394	394	394
10	394	394	394	394
12	395	395	395	395

Nominal or standard size, in inches	Drawn**
	S= 10,000 psi 300F	S= 9,700 psi 350F	S= 9,400 psi 400F
1/4	—	—	—
3/8	953	925	896
1/2	825	800	776
5/8	—	—	—
3/4	680	660	639
1	563	546	529
1-1/4	565	548	531
1-1/2	553	536	520
2	499	484	469
2-1/2	457	444	430
3	423	410	397
3-1/2	421	408	395
4	419	406	394
5	388	377	365
6	364	353	342
8	382	371	359
10	383	371	360
12	383	372	360

* Based on maximum allowable stress in tension (psi) for the indicated temperatures (F).

** When brazing or welding is used to join drawn tube, the corresponding annealed rating must be used.

*** Types M and DWV are not normally available in the annealed temper. Shaded values are provided for guidance when drawn temper tube is brazed or welded. For more information, see Pressure Ratings and Burst Strength.