Regarding the base metal test plates for heat treatment of pressure vessels
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Premise: Two pressure vessels are produced from a set of drawings; the vessel cylinders require normalizing heat treatment, and the steel plates for the cylinders of the two vessels come from the same furnace and batch. Question: If two containers can undergo normalizing heat treatment in the same furnace, how many base metal test plates are required? Is one piece required for each container, or can two containers share one heat treatment test plate made from the base material? ； If two containers cannot be heat-treated in the same furnace but use the same heat treatment process, how many base metal test plates are required?
You can communicate with the on-site inspection team from the Special Inspection Institute that can work with your company, and apply for batch test samples of the equipment.
Well, this will ensure approval during the inspection, but I want to clarify this matter; it would be best to find a standard basis for it
Based on the conditions stated by the poster, if welding is done in the same furnace, only one heat-treatment specimen for the base material is required per furnace (while for product welding specimens, one is needed per furnace); it’s harder to say anything if welding is done in different furnaces.
If processed in the same furnace, only one piece is needed; if in different furnaces, two pieces are required. If preparation is done together with product test plates, then each must be made separately
Why is it necessary to make a base material heat treatment test plate for each unit when combining it with the product test plate?
You’re right, but I’m talking about the base metal test plate
The last edit to this post was made by Seawater sky ice on 2022-7-18 at 09:11. Product test pieces cannot be produced in batches as substitutes for actual products; the base material, however, can be used in such a way. It is also possible to combine one unit for use as a product test piece while using another unit separately, but this is only feasible if both units are processed in the same furnace