API RP 576-2017 pdf free download
API RP 576-2017 pdf free download.Inspection of Pressure-relieving Oevices.
1 Scope This recommended practice (RP) describes the inspection and repair practices for self-actuated pressure-relieving devices commonly used in the oil/gas and petrochemical industries. As a guide to the inspection and repair of these devices in the user’s plant , it is intended to ensure their proper pertormance. This pub lication covers self-actuated devices such as direct-acting spring-Ioaded valves , pilot-operated pressure-relief valves , rupture disks , pin-actuated devices , and weight-Ioaded pressure vacuum vents. The recommendations in this publication are not intended to supersede requirements established by regulatory bodies. This publication excludes tank weak seams and/or sections or tank thief hatches , explosion doors , fusible plugs , control valves , pressure-regulating devices , integral rotating equipment components , other devices that either depend on an external source of power for operation or are manually operated , or devices not designed to be inspected or recertified. Inspections and tests made at manufacturers’ plants , which are usually covered by codes or purchase specifications , are not covered by this publication. This publication does not cover training requirements for personnel involved in the inspection and repair of pressure-relieving devices. Those seeking these requirements should see API 51 0 and API 570 , which give the requirements for a quality control system and specify that the repair organization maintain and document a training program ensuring that personnel are qualified. 2 Normative References The following referenced documents are indispensable for the application of this documen t. For dated references , only the edition cited applies. For undated references , the latest edition of the referenced document (including any amendments) applies.
3.10 d es ign pr ess ur e The pressure , together with the design temperature , used to determine the minimum permissible thickness or physical characteristic of each vessel component as determined by the vessel design rules. The design pressure is selected by the user to provide a suitable margin above the most severe pressure expected during normal operation at a coincident temperature. It is the pressure specified on the purchase order. This pressure may be used in place of the MAWP in all cases where the MAWP has not been established. The design pressure is equal to or less than the MAWP. 3. 11 galling A condition whereby excessive friction between high spots results in localized welding with subsequent splitting and a further roughening of rubbing surfaces of one or both of two mating parts 3.12 huddling chamb er An annular chamber located downstream of the seat of a pressure-relief valve for the purpose of assisting the valve to achieve lif t. 3.13 lift The actual travel of the disc away from the closed position when a pressure-relief valve is relieving. 3.14 lifting lever A device on the relief valve that applies external force to the stem of the relief valve , which can be used to manually operate the valve. 3.15 manufacturing design range The pressure range at which the rupture disk shall be marked. Manufacturing design ranges are usually catalogued by the manufacturer as a percentage of the specified burst pressure. Catalogued manufacturing ranges may be modified by agreement between the user and the manufacturer. 3.16 ma rked bu rs t pr ess ur e The burst pressure established by tests for the specified temperature and marked on the disk tag by the manufacturer. The marked burst pressure may be any pressure within the manufacturing design range unless otherwise specified by the customer. The marked burst pressure is applied to all of the rupture disks of the same lo t.
