ASME PVHO-2–2019 pdf download
ASME PVHO-2–2019 pdf download.Safety Standard for Pressure Vessels for Human Occupancy: In-Service Guidelines.
The owner shall be responsible for performing period- icalpressuretestingofthePVHOpressureboundary,pres- surized systems, and PVHO operational systems. Test pressures shall be at maximum operating pressure and not exceed the maximum allowable working pressure of the components/systems being tested. These tests shallbeperformedanddocumentedataperiodicityestab- lished by the user, manufacturer, and/or applicable juris- diction. Pressuretestingshallbeperformedonanyvalve,fitting, and/or piping/tubing that penetrate the PVHO pressure boundary following reassembly or replacement. The test boundary shall include the first stop valve both upstream and downstream of the reassembled or replaced compo- nent. Pressure testing after pressure vessel or piping weld repairs shall be a hydrostatic or pneumatic test and shall follow the applicable pressure vessel or system component code or standard. Newpressure boundarycomponents (i.e., valve, piping, and windows) shall be hydrostatically or pneumatically tested in accordance with the applicable pressure vessel or system component code or standard. 1-3.2 PVHO Windows and Viewports The owner shall be responsible for ensuring that in- service viewport evaluations, window replacements, and inspections are performed in accordance with this Standard. (a) PVHO acrylic windows shall be evaluated and, if necessary, repaired per subsections 2-4 through 2-6 of this Standard.When evidence ofa flawis detected ora modification of a PVHO pressure boundary is planned, the owner shall be responsible for ensuring that the PVHO is evaluated and repaired, replaced, or modified in accordance with the re- quirements ofthis Standard, applicable codes, and appro- priate jurisdictional authorities. (a) In-service flaw evaluation techniques, such as non- destructive examination, shall be applied to assess the potential impact to the structural integrity against the PVHO’s original design specification and code. Alterna- tively, the PVHO can be evaluated to the current code provided it is applied to the entire PVHO. (1) PVHOs designed, fabricated, and tested to ASME Boiler and Pressure Vessel Code (BPVC), Section VIII, or certified to ASME PVHO-1 alternative design rules, that show signs of flaws or damage may be evaluated using API 579-1/ASME FFS-1. (2) PVHOs thatare designed and fabricated to ASME PVHO-1 Code Cases shall be evaluated and repaired in accordance with requirements stated in the case. (b) Pressure boundary repairs shall include a plan and repair and test procedures consistent with the applicable code.Repairs thatdo notbringthePVHO totheoriginal“as designed” condition are considered a modification. (1) ForPVHOsstampedperASME BPVC, SectionVIII, the National Board Inspection Code (ANSI/NBBI NB-23) provides applicable weld repair and modification proce- dures. (2) All other repairs shall be certified by a qualified Professional Engineer or Authorized Inspector to be in compliance with this Standard and applicable code(s). (c) Pressure boundary modifications shall be performed in accordance with the most recent code regardless of the original year of fabrication. A Profes- sional Engineer shall be responsible for the modification design and compliance with applicable code require- ments. (d) All pressure boundary parts that are replaced shall meet original manufacturer specifications.
Allrepair, replacement, and modificationdocumen- tation shallNo checklists or logs, other than those required by an operatorlocated inside the PVHO, are to remain inside the PVHO during operations. All checklists and logs shall be completed by a qualified person(s). Allchecklists andlogs mustbecompletelyfilled out,signed, anddatedbythe person(s) who completedthe task. 1-7.1 Checklists Before commencingoperations, all preoperationcheck- lists, including those for support equipment, shall be reviewed, signed, and dated by the person responsible for the operation of the PVHO, thereby confirming the PVHO and its support equipment are acceptable for the anticipated operational activities. 1-7.1.1 Preoperation Checklists. These are detailed listair,breathinggases,batterystatus,consumables,etc.,shall be recorded. 1-7.1.2 Post-Operation Checklists. These are detailed list(s) of systems, subsystems, components, support equipment, control systems, monitors, and indicator systemthatshall be checkedatthe conclusionofanopera- tion. 1-7.1.3 PrestorageChecklists. IfthePVHO is to beshut down for an extended period oftime, a detailed checklist shall be preparedto coverstorage requirements including items that can be adversely affected during storage.
