Tubesheet blind tapped hole for pulling out bundle
Tubesheet blind tapped hole for pulling out bundle
(OP)
Dear Experts,
If we drill tubesheet for blind tapped hole for pulling out bundle. Should we plug with bolt this blind tapped hole.
ASME Section VIII UG-43(d) states "The distance from the inside sur-face of the vessel to the bottom of a drilled hole to be tapped shall not be less than the corrosion allowance plus
one‐fourth of the minimum required wall thickness."
and UG-43(g)states details of studs. It is unclear that can we leave this tapped hole without plugging?
Thanks,
If we drill tubesheet for blind tapped hole for pulling out bundle. Should we plug with bolt this blind tapped hole.
ASME Section VIII UG-43(d) states "The distance from the inside sur-face of the vessel to the bottom of a drilled hole to be tapped shall not be less than the corrosion allowance plus
one‐fourth of the minimum required wall thickness."
and UG-43(g)states details of studs. It is unclear that can we leave this tapped hole without plugging?
Thanks,
RE: Tubesheet blind tapped hole for pulling out bundle
Regards
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Tubesheet blind tapped hole for pulling out bundle
https://www.eng-tips.com/viewthread.cfm?qid=479055
Regards
RE: Tubesheet blind tapped hole for pulling out bundle
I don't see how UG-43(d) applies because it covers attaching pipe/nozzle necks to vessel walls. I also don't see how the thread linked above is relevant here as that thread is about drilled and tapped holes for collar bolts on the bolt circle of the tubesheet.
-Christine
RE: Tubesheet blind tapped hole for pulling out bundle
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P.E. Metallurgy, consulting work welcomed
RE: Tubesheet blind tapped hole for pulling out bundle
Actually i wanted to know that how much we can drill tubesheet and after drilling and completion of pulling and putting bundle in service, do we need plug hole that we drilled for prevent decrease tubesheet strength and preventing any leak?
RE: Tubesheet blind tapped hole for pulling out bundle
Properly you can use the actual threaded hole in the top of the tubesheet.
Regards
RE: Tubesheet blind tapped hole for pulling out bundle
RE: Tubesheet blind tapped hole for pulling out bundle
Plug with a couple of plugs of suitable metallurgy. Use anti-seize.
Might be able to go smaller, 7/16 or even 3/8 depending on bundle weight and service. Consult published eyebolt data.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Tubesheet blind tapped hole for pulling out bundle
Be practical.
Eyebolts are frequently lost.
Regards