Transcription of Pressure Relief Device Inspection
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Pressure Relief Device Inspection
Pressure Relief Device Inspection Review of NBIC Part 2, par. Prepared by: J. F. Ball, P. E. Updated November 2016 1 Purpose of Pressure Relief Devices Last line of defense against overpressure condition Overpressure could lead to failure of the boiler or Pressure vessel (PRI) Protection for both persons and property PRDs are not designed as Pressure control devices! 2 Keys to In-service Inspection Safety considerations Pressure Relief Device and PRI data Device condition Installation condition Testing and Operational Inspection 3 Safety Considerations High Pressure discharge may have considerable energy released High temperatures may be involved (steam) High levels of noise encountered during testing 4 PRI Data First look at application and PRI nameplate Determine MAWP and design temperature Determine steaming capacity or heating surface for boilers What is the service fluid? 5 Device Data Correct Code Stamp for application Power and heating boilers Low Pressure steam heating boilers, hot water heating boilers, hot water heaters Unfired Pressure vessel service 6 ASME Certification Mark with Designator New ASME Certification Mark Replaced previous Code stamps after 2013 Designator gives service V, HV, UV, or UD for Pressure Relief devices X 7 Device Data Set Pressure Inspect Pressure Relief Device nameplate data Set Pressure for single Device cannot exceed MAWP Set Pressure of high s
Inspection • Does the valve actually work? • Lift lever test • !t least it’s not stuck shut… • Test at 75% of set pressure for boiler or pressure vessel valves • Section IV valves can be checked without pressure • Section VIII: Test lever required for …
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