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Can vent or drain holes be drilled larger than 1/4" in handrails on floating structure?
asked
Aug 18, 2014
in
Material
by
cuchiang
(
2,310
points)
vent
drain
hole
handrail
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1 Answer
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answered
Aug 19, 2014
by
Tadd Pham
(
5,620
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|
selected
Aug 19, 2014
by
cuchiang
Best answer
No, vent or drain holes in handrails should not be drilled larger than 1/4" during fabrication on the underside of all handrail chords.
Burning is also not recommended.
commented
Aug 19, 2014
by
cuchiang
(
2,310
points)
Thanks for your input. I have another related question on this subject. Can vent or drain holes (ballast area) be dipped galvanized after drilling or cutting?
commented
Aug 19, 2014
by
Tadd Pham
(
5,620
points)
No, that is not recommended. You should not cut or drill vent or drain holes in any of the items to be hot dipped galvanized. Vent and drain holes on items to be installed in the ballast and coated fluid storage tanks should be sealed. However, it does not apply to sounding tubes.
All fabrication, welding, NDE and forming should be completed prior to galvanizing.
Field welding is typically exercised on galvanized pipe only in special circumstances such as welding flanges where the weld damage can be internally repaired from the open end.
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