Lifting Lugs

[aiwa7777]

Client has ordered a U stamped pressure vessel with -29C MDMT.
Client specification also states that lifting lugs shall be designed for -45C MDMT.

Question:
How do you establish the MDMT of lifting lug
which design code can be used for MDMT

Thanks in advance.

 

[metengr]

Look at Section VIII, Div 1 and select an appropriate lug material based on UCS-66.

 

[aiwa7777]

Dear Metengr

Thanks for a quick response.

Is ASME code applicable to design of lifting lugs ?

Thanks

 

[Duwe6]

Nope -- lifting lugs are a structural appurtnance that is not addressed by Sect VIII.

 

[jamesl]

Impact test of lifting lugs is not required by ASME code. However you can apply impact test requirements in Section VIII to lifting lugs.

 

[gr2vessels]

aiwa,
It is really simple. Your Client requested you to provide welded lifting lugs of material compatible with the equipment material, impact tested at -45C (does not seem they asked your opinion on what the MDMT should be). Regardless of your opinion over the sanity of this request, they are paying you to give them what they ask for. Also, the welding of the attachment has to comply with the code and Client specification, ie qualified for -45C if the Client wants that. Tha ASME VIII code allows in some cases a reduction in the testing temperature, you have to read the code to see if you qualify for that reduction. Alternatively, give us details of the design conditions and the forum will advise you the appropriate MDMT.
Cheers,
gr2vessels

 

[racookpe1978]

"That ASME VIII code allows in some cases a reduction in the testing temperature, you have to read the code to see if you qualify for that reduction."

Seems you'd want the waiver to be an "increase" in measuring temperature, since he didn't want to go "down" to -45C

 

[jbeckhou]

see DNV 2.7-1.

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