Metal Expansion Joint use via ASME B31.1 1

[PwrPlntGuy]

Trying to determine if the use of an expansion joint is acceptable based on configuration and ASME B31.1. It would be beneficial in reducing thermal expansion problems. I have parallel firetube paths feeding a steam drum. I would like to know if I can put the expansion joints on the inlet and outlet sides of the steam drum on the firetube paths or if that is not accepted. My guidance I have thus far is from 101.7.2 which states "However, flexible metal hose assemblies, and expansion joints of the corrugated bellows, slip or sleeve type shall not be used in any piping system connecting the boiler and the first stop valve in that system.

Appreciate any assistance with this.

 

[rmw]

Why may I ask are you wishing to put an EJ between a boiler and the first stop valve? I haven't back checked B31.1 on what you stated, but actually , the territory between the boiler and the first stop valve comes under the boiler code, not B31.1 although I don't faul B31.1 for mentioning it. If you are truly wanting to do something inside the first stop valve, get a copy of the boiler code to tell you what to do. If you are outside the first stop valve, B31.1 is your guide.

rmw

 

[Mr168]

rmw - would that not be B31.1 jurisdiction for design and fabrication after the first circumferential weld off the drum?

 

[PwrPlntGuy]

Sorry for the delay in response, I did not get the e-mail notification of the first reply. I believed that this was an applicable spec to apply to this scenario due to location and associated variables. If I am incorrect in using this as a pseudo governing document on design, I can look at BPVC instead.

Thanks for your time and input. I do read this as a non-allowance of the ej in that area though.

 

[metengr]

B31.1 has technical jurisdiction under Section I, and this would not be permitted.

 

[Fizza453]

Pwrplntguy,
The following restriction has been removed in Edition 2012 of B31.1 because para. 101.7.2 has been revised, its last sentence has been deleted.

"However, flexible metal hose assemblies, and expansion joints of the corrugated bellows, slip or sleeve type shall not be used in any piping system connecting the boiler and the first stop valve in that system."


Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN

 

[Fizza453]

Pwrplntguy,

The above sentence has been removed from 101.7.2 but has been added in the form of a new sub-paragraph 122.1.1(I) that is more logical to put it under master para. 122.1 that is design requirements pertaining to BEP.
Sorry for my statement in my very last comment. Now I have same opinion as Metengr has.

Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN