Can the equipment flanges be cut and welded on-site?
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I would like to ask everyone: if the flange does not fit after the equipment arrives and needs to be replaced, can we simply cut off the existing flange and then weld a new one in its place? I mainly want to know if the equipment is delivered as a complete unit, having undergone the corresponding factory tests – is that acceptable? If it’s a pressure vessel, isn’t it not allowed to make modifications on site?
Communicate with the design department and obtain permission from the supervision and inspection department!
There are many inconveniences associated with on-site welding. For example, after welding, if radiographic testing, hydrostatic testing, or heat treatment is required, how can these tests be carried out? Do the on-site climate conditions permit welding? Whether welding is to be carried out on-site or in a factory is not within the scope of responsibility of the design engineer; it is necessary to submit the matter to the regulatory authorities at the location of use, and execution is only permitted after approval is granted.
It is best to make changes to the container docking flanges; this is something that the manufacturer needs to handle. For reference.
A design modification notice is required, as well as the original design drawings. The construction party on site must possess the necessary qualifications for manufacturing such pressure vessels, and supervision of equipment repair and modification is also needed, among other things.
For the maintenance of on-site equipment, in the case of pressure vessels falling into the aforementioned category, it is necessary to submit an application for supervision and inspection; moreover, a qualified construction unit is required to carry out tasks such as flaw detection and pressure testing based on the design documents
If it is a **unregulated device, it can be handled arbitrarily according to the factory’s rules……
It depends on whether the flange is under pressure and whether its diameter is not greater than 250 mm
No. It is generally a modified pipe flange
We still need to see what the device looks like before making a decision
“\"Inappropriate back flange\" encompasses various situations: mismatched pressure ratings, mismatched diameters, mismatched standards (sealing surfaces and bolt holes that do not fit together)…… The solutions for each situation vary. This is why the supply interface flanges for general equipment are required to be equipped with matching flanges.