ASME VIII UG-34 Cover with radial hole for lifting 2

[jennin77]

There are already previous threads abiut that but no real answer, I try again!

Design ASME VIII Div.1 UG-34 , Blind cover type j or k: Can I add a radial treaded blind hole to assembly on the outer cylindrical surface a male lifting eyebolt? It is intended for cover handling and lifting during fabrication and assembly, vessel will have no lifting eye assembled during operation (but hole will remain in the cover of course).

I see that standard practice is weld lifting plates, but I do not understand if additional holes shall verified with Div.2 as mandatory requirement or if UG-34 can still fully comply with this geometry.

Any help appreciated!

 

[SnTMan]

No problem, ignore it for UG-34, assuming it is not "too large". I'd suggest you plug it with a setscrew though.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[r6155]

I never saw during assembly the need for any permanent fixture on a blind flange.
Installers use flange holes.

Regards

 

[SnTMan]

Lift lugs or threaded holes for eyebolts are pretty much universal on channels, channel covers, shell covers and other removable parts of shell & tube HX's.

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[r6155]

A davitless lifting lug is not suitable for the blind flange.
It may happen that the lifting lug on a blind cover on the heat exchanger is used to lift the equipment: be careful
The lifting lug on the blind flange must be designed with an appropriate impact factor.
A load test must be performed.
See TEMA 10th 2019 G-7.2 Lifting device.

Regards

 

[SnTMan]

Lugs without davits are supplied all the time. Load tests are rarely if ever performed. No need to quote TEMA to me.

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[r6155]

A lifting lug on a blind flange without a davit is not a good design.

“Load tests are rarely if ever performed”. It means this is good engineering practice for you !!

Regards

 

[SnTMan]

r1655, no offense intended, but I'd note you made no effort to address OP, UG-34 yes / no. I see no need for any further response on my part.

Regards

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[r6155]

Please refer to ASME B16.36 Orifice Flanges and you can use it properly.
Avoid UG-34
Regards