After the hydraulic testing of the equipment, under what circumstances is it necessary to conduct non-destructive testing again?
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After the newly manufactured container passes the hydraulic test, under what circumstances is it necessary to conduct non-destructive testing again? Where are such regulations specified? Please someone knowledgeable answer this, thank you
It was probably due to leakage after pressure testing, which led to repairs
If there is leakage after the pressure test, it does not fall under the category of \"successful hydraulic testing\" as required by the specifications; how can leakage during a pressure test be considered \"successful hydraulic testing\"?
As stated in the title, when the material of such newly manufactured pressure vessel is low-alloy steel with Rm≥540 MPa, surface non-destructive testing of the welded joints shall also be carried out after the pressure test is successful. See the screenshot for details.
It is specified in the last sentence of item (4), under surface non-destructive testing, in 3.2.10.2.2.4 of TSG 21-2016 \"Safety Technical Inspection Regulations for Fixed Pressure Vessels\".
Low-alloy steel containers with a minimum standard tensile strength of greater than 540 MPa.
Thank you for the replies from those above; I’ve learned* from it
After passing the hydraulic test, if the equipment is damaged, non-destructive and hydraulic tests must be conducted again in accordance with the original requirements after repair. Such abnormal situations do exist. :) Normal conditions are shown in 4#
After the pressure test, repairs are carried out; if the extent of these repairs exceeds half of the wall thickness, another pressure test must be conducted.
After the container passes the hydraulic test, conducting non-destructive testing again is mainly determined by the material of the equipment; both 150 and relevant regulatory standards require this, and attention must also be paid to the timing of performing the non-destructive testing