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Floating roof tank underside Welding

Floating roof tank underside Welding

(OP)
How to interpret it
Code: API 650
Annex C
C.3.3.3: Deck plates shall be joined by continuous full-fillet welds on the top side. On the bottom side, where flexure
can be anticipated adjacent to girders, support legs, or other relatively rigid members, full-fillet welds not less than
50 mm (2 in.) long on 250 mm (10 in.) centers shall be used on any plate laps that occur within 300 mm (12 in.) of any
such members. A minimum of three fillet welds shall be made..

Is stitch weld is required on roof bottom sides Or leave it with No weld.

RE: Floating roof tank underside Welding

This section is very clear. 2" in 10" stitch welds within 12" of objects where flexure is anticipated. No weld is not an option in these areas.

RE: Floating roof tank underside Welding

(OP)
Thanks IFRS
Is stitch weld is required on ENTIRE roof bottom sides Or leave it with No weld except the locations where flexure is anticipated.

RE: Floating roof tank underside Welding

Underside welding is required where flexure is anticipated. The code does not require underside welding in other areas. If the underside of the IFC is to be painted, underside welding will be needed, but that is not because of the API code.

RE: Floating roof tank underside Welding

(OP)
thanks ,IFRs this is what i want to know .Thanks a lot

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