Copper – Internal Working Pressure Type K*

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

1074913877860 1130960923904 891758728713 736626601589 852724696682 655557535524 532452434425 494420404396 435370355348 398338325319 385328315308 366311299293 360306294288 345293281276 346295283277 369314301295 369314301295 370314302296

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
1/2
5/8
3/4
1
1-1/4
1-1/2
2
2-1/2
3
3-1/2
4
5
6
8
10
12

842716537 885753565 698594446 577491368 668568426 513437327 416354266 387330247 341290217 312265199 302257193 286244183 282240180 270230172 271231173 289246184 289246184 290247185

Nominal or standard size, in inches	Annealed***
	S= 4700 psi 300F	S= 4000 psi 350F	S= 3000 psi 400F
1/4
3/8
1/2
5/8
3/4
1
1-1/4
1-1/2
2
2-1/2
3
3-1/2
4
5
6
8
10
12

1850185018501850 1946194619461946 1534153415341534 1266126612661266 1466146614661466 1126112611261126 914914914914 850850850850 747747747747 684684684684 662662662662 628628628628 618618618618 592592592592 595595595595 634634634634 634634634634 635635635635

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
1/2
5/8
3/4
1
1-1/4
1-1/2
2
2-1/2
3
3-1/2
4
5
6
8
10
12

179617421688 188918331776 149014451400 122911931156 142413811338 109310611028 888861834 825801776 726704682 664644624 643624604 610592573 600582564 575557540 578560543 615597578 615597578 617598580

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
1/2
5/8
3/4
1
1-1/4
1-1/2
2
2-1/2
3
3-1/2
4
5
6
8
10
12

* 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.