The NB represents the enforcement agency who assures adherence to provisions of the ASME boiler and pressure vessel codes. National Board of Boiler & Pressure Vessel Inspectors (NB) – Lifting lever for water (>140✯ ), air or steam service – Nameplate showing rated capacity in SCFM air, US-GPM water or lb/hr steam 6 | Ma| Proprietary © Curtiss-Wright – Set pressure tolerance: – Pset 70 psig – Blowdown requirements: – Pset 250 and ≤ 375 psi – Pset > 375 psiĤ psi 6% of set pressure 15 psi 4% of set pressure – 3% maximum overpressure at rated capacity. This is a construction code covering power, electric and miniature boilers and high temperature boilers used in stationary service above 15 psig. – ASME Code Section II – ASME Code Section III The ASME establishes rules of safety governing the design, the fabrication and the inspection during construction of boilers and unfired pressure vessels, and interprets these rules when questions arise regarding their intent.ĭifferent Sections of ASME Code deal with the manufacture of safety valves: The aim of this presentation is to discuss the Codes & Standards which apply to pressure relief valves.Ģ | Ma| Proprietary © 2014 Curtiss-WrightĪmerican Society of Mechanical Engineers 1 | Ma| Proprietary © 2014 Curtiss-Wright
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