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API 653 Lap Patch Hole Size

thread809-490934

API 653 Lap Patch Hole Size

API 653 Lap Patch Hole Size

(OP)
API 653 sec 9.3.2.1 states that minimum hole diameter for use of lap patch is 2". Do you all agree that if I have a 1/2" corroded hole, that it would need to be cut/drilled out to 2" diameter for a lap patch to be used?

RE: API 653 Lap Patch Hole Size

Quote (iangineer


API 653 sec 9.3.2.1 states that minimum hole diameter for use of lap patch is 2". Do you all agree that if I have a 1/2" corroded hole, that it would need to be cut/drilled out to 2" diameter for a lap patch to be used?)


TRUE!!

9.3.2.1 The welding shall be continuous on the outer perimeter of the repair plate and the inner perimeter of the hole
in the shell plate. The minimum hole diameter is 2 in. Shell openings due to plate removal shall have a minimum
corner radius of 2 in.

Pls look Figure 9.1— Acceptable Details for Replacement of Shell Plate Material for weld spacing requirements etc..

RE: API 653 Lap Patch Hole Size

(OP)
@HTURKAK, I forgot to thank you for your response. Thank you!

RE: API 653 Lap Patch Hole Size

How thick is the shell plate? Have you checked the lap patch thickness using the appropriate lap joint efficiency? You might need a butt patch...

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