Weld repairs and alterations of pressure vessels and piping built to ASME codes may require pressure testing to prove the integrity of the weld and/or design. In recent years, several designs were developed to employ bolted devices when performing local pressure testing of flange-to-nozzle, flange-to-pipe and nozzle-to-shell attachment welds. Due to the cost and equipment down time associated with performing a full conventional pressure test and the desire to reduce repair costs, several petrochemical companies adopted the use of such devices. The purpose of this paper is to compare the stress values and stress distribution associated with both techniques. The advantages and disadvantages of both approaches are discussed and the conclusions are supported by a practical example.

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