Davit Arm Eyebolt for Low Temperature Service (-50°F) 1

[marty007]

Hello,

A customer has asked us to design a davit arm assembly for an outdoor manway, and want all materials certified for -50°F MDMT.

The design is per PIP VEFV1117 (manway on side of vertical tower).

I am having a tough time specifying the eyebolt material. Normally for warmer temperatures we would specify a galvanized 1030 eyebolt, but as far as I've found, this should only be good to +30°F per ASME specs.

Can anyone recommend a suitable material for an eyebolt with a certified low temperature of -50°F for outdoor operation?

Thanks all,
Marty

 

[SnTMan]

marty007, could use stainless / non-ferrous, or take a reduction per UCS-66(b)?

I personally find applying MDMT requirements to non-pressure parts going a bit beyond the intent.

Regards,

Mike

 

[Duwe6]

304 or 316 stainless both are rated down to liquid nitrogen boiling point; (-)320°F, IIRC. No 'certification' required, ASME recognizes this as an inherent property of these materials.