Welding Procedure Qualifications for Low Temperature Applica
Welding Procedure Qualifications for Low Temperature Applications (1995)-The ammonia industry needs to ensure that all ammonia refrigeration systems are installed and tested safely. Every system needs to be in compliance with all national, state, and local governing codes. End users should require their installing contractors to have correct, qualified welding procedures before any work begins. There are two commonly accepted welding codes in use in this industry. They are Section IX of the Boiler and Pressure Vessel (BPV) Code published by the American Society of Mechanical Engineers (ASME) and the D10.9 Pipe Welding Code published by the American Welding Society (AWS). In most areas of the United States, compliance with the AWS Pipe Welding Code is acceptable, but some states require compliance with Section IX of the BPV code. The major difference between the two codes is that the AWS Pipe Welding Code allows the use of pre-qualified procedures while the BPV does not. In addition, chapter III, paragraph 523.1 of ASME B31.5, Refrigeration Piping Code, dictates how materials for low temperature refrigeration piping shall be tested. This paper deals specifically with low temperature refrigeration welding procedure qualifications .
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