Copper – Internal Working Pressure Type K*

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

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	1074	913	877	860
3/8	1130	960	923	904
1/2	891	758	728	713
5/8	736	626	601	589
3/4	852	724	696	682
1	655	557	535	524
1-1/4	532	452	434	425
1-1/2	494	420	404	396
2	435	370	355	348
2-1/2	398	338	325	319
3	385	328	315	308
3-1/2	366	311	299	293
4	360	306	294	288
5	345	293	281	276
6	346	295	283	277
8	369	314	301	295
10	369	314	301	295
12	370	314	302	296

Nominal or standard size, in inches	Annealed***
	S= 4700 psi 300F	S= 4000 psi 350F	S= 3000 psi 400F
1/4	842	716	537
3/8	885	753	565
1/2	698	594	446
5/8	577	491	368
3/4	668	568	426
1	513	437	327
1-1/4	416	354	266
1-1/2	387	330	247
2	341	290	217
2-1/2	312	265	199
3	302	257	193
3-1/2	286	244	183
4	282	240	180
5	270	230	172
6	271	231	173
8	289	246	184
10	289	246	184
12	290	247	185

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	1850	1850	1850	1850
3/8	1946	1946	1946	1946
1/2	1534	1534	1534	1534
5/8	1266	1266	1266	1266
3/4	1466	1466	1466	1466
1	1126	1126	1126	1126
1-1/4	914	914	914	914
1-1/2	850	850	850	850
2	747	747	747	747
2-1/2	684	684	684	684
3	662	662	662	662
3-1/2	628	628	628	628
4	618	618	618	618
5	592	592	592	592
6	595	595	595	595
8	634	634	634	634
10	634	634	634	634
12	635	635	635	635

Nominal or standard size, in inches	Drawn**
	S= 10,000 psi 300F	S= 9,700 psi 350F	S= 9,400 psi 400F
1/4	1796	1742	1688
3/8	1889	1833	1776
1/2	1490	1445	1400
5/8	1229	1193	1156
3/4	1424	1381	1338
1	1093	1061	1028
1-1/4	888	861	834
1-1/2	825	801	776
2	726	704	682
2-1/2	664	644	624
3	643	624	604
3-1/2	610	592	573
4	600	582	564
5	575	557	540
6	578	560	543
8	615	597	578
10	615	597	578
12	617	598	580

* 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.