Is surface inspection required for the joint between the flange and the head of this equipment?
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There is a heat exchanger with a diameter of DN300, using tubes with an outer diameter of 325 as the shell. The tube sheet flanges are of the PL type in accordance with the HG/T20592 standard, the flange material is Q235B, and the shell material is 20. Is surface inspection required for the Class C joints between this shell and the tube sheet?
This standard is not mandatory and is determined by the design itself.
Can Q235B be used as the flange material? There seem to be many restrictions on the use of Q235B at 150.
It’s necessary, right? This device doesn’t seem to have many welds either
Q235B specified in Appendix D of GB150.2 can be used for flanges with a thickness of not more than 30 mm
If it is considered as a pipe flange, surface inspection may not be necessary, but in this equipment, this flange should be regarded as a main flange; therefore, I think it is better to carry out surface inspection. There is another scenario: if the flange does not conform to either the pipe flange standards or the vessel flange standards, would anyone carry out welding on this joint?
It depends on the pressure and medium; it is determined by the designer, with no fixed rules.
The requirements for non-destructive testing of the welded joints of pressure vessels are clearly specified in 3.2.10.2.2.4 of the Pressure Vessel Code, and are also clearly outlined in 10.4 of that same code; the person in question can follow these standard specifications. The original poster did not specify the relevant design parameters and the properties of the materials used. Based on what was stated, I suspect that the requirements of the codes and standards may not be met. However, the Code for Fixed Containers states in Article 9 that \"welded joints for which the designer deems surface inspection necessary\" are required, and Article J of 150 specifies that \"fitting fillet welds that require inspection as per the design documents\" must be addressed. The weld mentioned by the poster is the fillet weld between the equipment flange and the cylinder; in my opinion, it’s still a good idea to conduct a surface inspection.
The question concerns the flange for 20592. Is surface inspection required for flanges made using the standard NBT47021 equipment? Is it necessary for non-standard flanges as well?
The question concerns the flange for 20592. Is surface inspection required for flanges made using the standard NBT47021 equipment? Is it necessary for non-standard flanges as well?