Abstract

MULLER, A.M.  and  HEYNS, M.. Technical Note: Does the spring setting of a safety relief valve really deviate after being in operation?. R&D j. (Matieland, Online) [online]. 1998, vol.14, pp.56-61. ISSN 2309-8988.

According to statistics from SASOL, set pressures of safety relief valves (SRVs) tend to deviate more than the allowable deviation margin of 10%. This was determined by doing a Leak test on the valves when they were removed from the plant to be overhauled. Tests were done at different stages to determine when the deviation actually occurs. The different stages are discussed in this paper and results are given. Another series of tests was done to determine if there is any correlation between the set pressures quantified by Leak testing and Trevi testing, which is an in-situ calibration method. This was done because only Leak-test values of set pressures were available on the valves and these values had to be compared with Trevi values after certain stages. It was also determined if SASOL's Leak tests were done according to Dresser's (valve supplier and manufacturer) specifications. The tests showed that SASOL's Leak tests gave approximately the same results as Dresser's calibration method.

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