Find a pressure vessel design firm
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What are the pressure vessel design firms in Zhejiang that can stamp drawings?
Currently, manufacturing companies can only design the equipment they produce!
Manufacturers with an outstanding design certificate can still engage in external design work.
It is estimated that the pressure vessel design firms do not dare to stamp the drawings officially unless they have reviewed them themselves
Don’t the drawings stamped by the design firm for external use need to go through design, verification, and review? And just stamp on the drawing where someone has already signed it!
So this is not about looking for something like “the drawings stamped by the pressure vessel design unit”.
The design firm can only stamp the drawings designed by its own team; if drawings from another firm are to be stamped by a certain design firm, those drawings must be created in the name of that stamping firm； The issuing entity must conduct reviews and calculations regarding the rationality, legality, validity, and strength of this drawing, and produce relevant strength calculation reports and other documents.
What the original poster means is to commission a design
It doesn’t matter where it’s stamped; you just draw the diagram, prepare the calculation documents, send them in electronic form to the design agency, have them processed and printed, stamped, and then sent to you. That’s all there is to it
There are plenty, but they won’t stamp the drawings for you.