External attachment welding for high temperature or cyclic service
External attachment welding for high temperature or cyclic service
(OP)
Dear all,
I have a project with the following requirements:
Clips or brackets for platforms, ladders, davits and pipe supports shall not be welded to the vessel shell or heads if any of the following conditions are presented:
a) Vessel design temperature of 1000°F (537 °C) or more
b) Vessel is in cyclic service
Based on your EPC experience, do you agree with a) and/or b) ?
I have a project with the following requirements:
Clips or brackets for platforms, ladders, davits and pipe supports shall not be welded to the vessel shell or heads if any of the following conditions are presented:
a) Vessel design temperature of 1000°F (537 °C) or more
b) Vessel is in cyclic service
Based on your EPC experience, do you agree with a) and/or b) ?





RE: External attachment welding for high temperature or cyclic service
RE: External attachment welding for high temperature or cyclic service
RE: External attachment welding for high temperature or cyclic service
RE: External attachment welding for high temperature or cyclic service
RE: External attachment welding for high temperature or cyclic service
RE: External attachment welding for high temperature or cyclic service
RE: External attachment welding for high temperature or cyclic service
RE: External attachment welding for high temperature or cyclic service
We normally do full penetration weld and grind fillet weld to a smooth concave curvature for internal and external attachment for cyclic service. As for high temperature, we may allow to weld external pipe support such that piping from the vessel will grow at the same rate as the vessel.
Internal attachments can have all kinds of shape based on process and mechanical purpose, are unavoidable, and can be a large quantity, such in reactor. By that I see no reason why external attachment is prohibited. The above a) and b) requirements are from our client and I am seeking if anyone does have that experience applying both criteria, or they are overfilled.
The cost to comply with these requirements is huge, since we have to build a structure around each vessel to serve as platforms as well as pipe support.
RE: External attachment welding for high temperature or cyclic service