Are welding procedures specified for both the welded joints of stressed components and those of unstressed components?
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The last edit to this post was made by fjfhsn on 2018-10-26 at 11:15. The Pressure Vessel Certification and Review Guidelines specify a requirement: welding procedures must be established for the welds of both pressure-bearing components and non-pressure-bearing components. What is included in this item? ①Welds between the supports and lugs and the shell: ②; Welds between the partition plates and the tube boxes: ③; Welds between the pipe strainers and the pipes as well as the shell: ④; Welds between the lifting lugs of the floating head cover and the domed head: ⑤; Welds between the rotation lugs of the manhole and the manhole flange: ⑥; Welds between the anti-loosening lugs and the movable sheet metal: ⑦; Gasket welds for pipe flanges and vessel flanges: ⑧; Sleeve welds for vessel flanges and manhole flanges. So far, only the welding process for ① has been carried out; the others have not been done, as some of them seem unnecessary. However, there is concern that review experts might raise issues. What do you think should be done to address this?
GB/T 150 stipulates that all welds connected to pressure-bearing components must be supported by weld assessment; such welds are classified as Class E welds.
But just like the swivel brackets on manholes, does it have to be replaced every time it gets damaged? Is this really too unnecessary?
Refer to clause 7.2.1 of 150.4； Clause 4.2.1.1 of the Solid Content Regulations
Clause 3.4.1 of the NB/T47015 standard also specifies the same requirement.
I mean, then it will be a bit more troublesome to do it, as that will result in more welds.
According to GB150, the relevant code for large capacity vessels, and 47015, these tests are all required; however, you can also follow the detailed requirements specified in NB/T47014. There isn’t a large number of tests to carry out, as the quantity depends on the scope of coverage
Classes A to E all require evaluation
Welding evaluations are available, but is it still necessary to create welding procedure cards or welding procedure specifications for everything?