Procedure for exemption from hydrostatic testing
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This post was last edited by realben on 2010-3-16 at 14:33. A high tower in a factory is being modified, with its openings enlarged to meet the needs of capacity expansion. Given the large height and volume of the tower, it is inconvenient and risky to conduct hydraulic tests on-site; therefore, it is desired to waive the pressure resistance test (as well as the gas-liquid combined test). What procedures are required to do this? Which standard regulations have their origins? Please answer relevant to the topic, thank you!
It shall be carried out in accordance with the provisions of 3.8 and 3.9 of GB150-1998.
It is stipulated in Clause 4.7.7 of the tolerance regulations.
Per clause 4.7.7 of the standards, or clause 4.7.8 may also be used.
This post was last edited by realben on 2010-3-16 at 14:35. The answers from the people above aren’t very relevant; neither the standards nor clause 150 specify how a user can be exempted from the voltage withstand test, and note that this doesn’t apply even in the case of gas-liquid combinations. The current situation is that the user can decide for themselves whether to carry out the renovation, and the designer’s approval has also been obtained. Is my understanding that an application should be submitted to the Ad Hoc Bureau, and then experts should be convened for a review?
Can Article 7.8 of the new regulatory requirements, “risk-based inspection,” be applied in this case? Please continue the discussion; no decision has been reached yet.
Article 3.9 of GB150-1998 \"Steel Pressure Vessels\": \"For vessels that cannot undergo pressure testing in accordance with the provisions of 3.8, the design unit shall propose measures to ensure the safe operation of the vessel and indicate these measures on the drawings.\" ” It is necessary to determine: 1. The conditions for exemption. 2. Measures taken after the exemption. General measures: 1. Materials – improve chemical composition, performance, and inspection requirements ； 2 Improve structural requirements: strive for full penetration in welding and avoid severe geometric discontinuities ； 3 Increase the safety margin of the overpressure relief device ； 4 Increase the proportion and level of non-destructive testing. It’s unclear what procedures are required.