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Temperature Limitation to Liquid and Gas piping

Temperature Limitation to Liquid and Gas piping

Temperature Limitation to Liquid and Gas piping

(OP)
I would like to apologise before I start my question again. I had asked this question in my other post in a different section. Please pardon me if this is a violation.

The temperature derating factor provided for ASME B31.8 stops at 450'F.

Does this mean that gas piping ( B31.8)can be designed only upto 450'F ?

Is there is temperature limitation to liquid and gas piping design ?

RE: Temperature Limitation to Liquid and Gas piping

B31.8 IS FOR TRANSMISSION LINES -- SELLING GAS TO SOMEONE ELSE.

RE: Temperature Limitation to Liquid and Gas piping

(OP)
Duwe6,
Misquoting was not my intention. I was just trying to cheat. I am from the manufacturing world. We have set out own boundaries where B31.4 and B31.8 have common guidelines. YOur statement has provided answer to the part that I was trying to cheat. Thank you.

But, my primary question remains unanswered.

The temperature derating factor provided for ASME B31.8 stops at 450'F.

Does this mean that gas piping ( B31.8)can be designed only upto 450'F ?

RE: Temperature Limitation to Liquid and Gas piping

That seems to be a reasonable presumption. I doubt if the writers of B31.8 envisioned that anyone would want to send anything that hot off-site. "Transmission" means shipping it beyond the limits of a facility. and usually involves 'change of custody' -- buying & selling. Why not switch to B31.3 [or 31.1] when your design temp goes above 450°F?

RE: Temperature Limitation to Liquid and Gas piping

Section 802 of B31.8 covers scope and intent

Section 802.1 (b) This Code does not apply to

(1)

(2) piping with metal temperatures above 450F or below -20F.

RE: Temperature Limitation to Liquid and Gas piping

(OP)
Thanks Guys. I am aware of ASME B31.3 Table A-1 , ASME II - D, ASME B31.8 Scope ..802..., ASME B31.4 ..400.1.2..(c) 2..I wanted to see if I missed anything. But again, now that I have more confidence due to your opinion, thank you again.

I am trying to understand the scope for some piping components (adapters and housings for hot tapping). I do not design pipe lines. But, I have to assume that if a code allows something, there could be someone out there who may want to do it. However, I have to let my customers know of the specified limitations, when I deny manufacturing, when I feel the need and provide them the proper reference of my standing ground.

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