One of the B31.3 material notes indicates that if brazing is used on B88
Type K copper tube, the stress values must be for the annealed condition.
B31.3 lists: light annealed (050 temper), soft annealed (060 temper), and
hard drawn (H temper). The ASTM material specification indicates the
material as "copper water tube." It is used in many applications. Stress
values are listed from -452 to 500 degrees F.
Calculations show that all sizes of this tube (nominal 1/4 thru 12 inch) have allowable pressures much higher than 100 psig.
Ben
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From: <a href="/group/PipingDesign/post?postID=vaJbwtxj_55K1FikFuMA0EZTpUxMSYogJLzYzSQ7NBNh2aTZjpAzM7-6-c62GUW3yntHyopXMH-MQfP8X6snnEQofmY">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=vaJbwtxj_55K1FikFuMA0EZTpUxMSYogJLzYzSQ7NBNh2aTZjpAzM7-6-c62GUW3yntHyopXMH-MQfP8X6snnEQofmY">PipingDesign@yahoogroups.com</a>] On
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Sent: Saturday, July 02, 2005 11:23 PM
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Subject: Re: reply to copper for High pressure relief vent piping
[PipingDesign]
On Jul 2, 2005, at 5:13 PM, Al wrote:
> brazing is legal under the welding codes but this is not the issue.
> the issue is whether the material is code rated
I've only seen the 'type K' designation used for domestic fuel gas
piping. It's fairly common there, but the applicable pressures are only
a few psi. ASTM B88 (Seamless Copper Water Tube) uses (or did use in
1966) the K, L, and M type designations for various tempers of
substantially pure copper (99.90% min Cu). The material isn't permitted
for ASME PV Code use, so I'd say it's not permitted for piping code
construction. Whatever material you end up using for ASME Code piping
work has to be (1) permitted by the Code in the sizes you need and your
service conditions (2) covered by a qualified brazing specification.
Rules for qualification are found in the code.
Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=3r2XwwZSLJjSibdR3OhFYb6gl9IT4i4rU3S-0Zb9qeFnCxKxW2Yu45jwgYW0vS4-E1ymulpMlBLYGumXqA">chrisw@skypoint.com</a> | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania1864)
Yahoo! Groups Links Received on Sun Jul 03 01:49:00 2005
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