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I should have made my question more clear. Sorry for the misleading. :) For my case the hot-tap location will be at the bottom shell course not on the roof. Hot-tapping on the deck of floating roof is a No-No. This is clearly stated in API-RP 2201. In this case will the weight of floating roof...

Duwe6 - thanks for the BIG warning here. Can you please advise why with a floating roof the 3 feet liquid level above hot-tap location cannot be achieved? If OPS can control the roof level way higher than hot-tap location is there still a concern of trapping gas?

Is there any requirements or precautions change on hot-tapping a floating roof tank versus fixed roof tank? I did not see any special notes in API-653 Par. 9.14 for Hot Tap. Please share your experiences. Thank you.

Thank you all for contributing experiences and engineering inputs in the conversation above. I truly appreciate it.

Thanks for your sharing above. Finally hear from API on the RFI submitted. Posted below for your reference. No helpful answer though... RFI: In API-653 the table 9.1 only lists hot-tap up to NPS18. Is this for a specific reason? For hot-tap over NPS18 which code/standard shall be followed to...

Thank you, IFRs. Yes multiple 18" hot-taps is an option. This is a specific request from client for us to design the 24" hot-tap. I will use the link provided to send out a technical inquiry.

Hi All, For performing hot-tapping on API-650 storage tanks, API-653 Table 9.1 only list nozzle size up to NPS18. Does it limit the hot-tap nozzle size up to NPS18? For certain cases if larger size hot-tap is needed, which code/standard shall be followed to validate the design? Thank you!