Welding Platform Knee Brace Backer Plates Over Vessel Weldments
Welding Platform Knee Brace Backer Plates Over Vessel Weldments
(OP)
(Re: Pressure Vessels or Non-Pressure Vessels)
Can anyone tell me if an ASME Code or another applicable code exists for the retro-fit design/installation of a circular platform with knee braces that DOES NOT ALLOW weldment of the new platform's connector brackets OVER an existing horizontal or vertical weld on the vessel.
I have, over the years, always heard that this is not an acceptable practice and tend to agree, for obvious reasons. But, is there a code that restricts the placement and weldment of these connection brackets over the vessel's welds?
Or has it only become an accepted industry practice over the years?
Thank you, in advance, for any assistance in this area.
TBell47
Can anyone tell me if an ASME Code or another applicable code exists for the retro-fit design/installation of a circular platform with knee braces that DOES NOT ALLOW weldment of the new platform's connector brackets OVER an existing horizontal or vertical weld on the vessel.
I have, over the years, always heard that this is not an acceptable practice and tend to agree, for obvious reasons. But, is there a code that restricts the placement and weldment of these connection brackets over the vessel's welds?
Or has it only become an accepted industry practice over the years?
Thank you, in advance, for any assistance in this area.
TBell47





RE: Welding Platform Knee Brace Backer Plates Over Vessel Weldments
ASME VIII is so lax on weld spacing I do not believe that you will find a specific prohibition. However, there is a nozzle repad requirement. If the shell weld will be covered by the repad, one must RT the area before it is covered.
Steve Braune
Tank Industry Consultants
www.tankindustry.com
RE: Welding Platform Knee Brace Backer Plates Over Vessel Weldments
Remember depending on the jurisdiction this may need an "R" stamp. Suggest you contact them.
RE: Welding Platform Knee Brace Backer Plates Over Vessel Weldments
Our solution when crossing welds was to weld brackets/hangers to the column and bolt the bracing to the hangers. This way we could essentially clear all the welds.
RE: Welding Platform Knee Brace Backer Plates Over Vessel Weldments
BS2654 Code [A Code for Vertical Stoage Tanks] in clause 11.15.2 prohibits placing vertical attachemnts 150mm away from any vertical seam and horizontal attachments 150mm away from horizontal seams.
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