ASME PVHO-2–2019 pdf download.Safety Standard for Pressure Vessels for Human Occupancy: In-Service Guidelines.
1-1 INTRODUCTION AND SCOPE (a) This Standard provides technical requirements and guidelines for the operation and maintenance of PVHOs and PVHO systems that were designed, constructed, tested, and certified in accordance with ASME PVHO-1, Safety Standard for Pressure Vessels for Human Occu- pancy. (b) This Standard provides technical criteria for the user to establish the serviceability of a PVHO acrylic window under its specific environmental service condi- tions. Windows in protected environments as well as those in severe environments are addressed. Judicious use of this Standard will allow the user and/or the juris- dictional authority to determine when a PVHO acrylic window requires replacement.
1-2 RESPONSIBILITIES AND JURISDICTIONAL CONSIDERATIONS 1-2.1 User’s Responsibilities The PVHO and PVHO systems user shall provide the designer with information regarding the service condi- tions that the PVHO and PVHO systems may encounter during their service life. The user shall protect the PVHO and its systems from hazards, and ensure they are used within their design limitations. It is the user, and not the designer or fabricator, who is responsible for determining the safe service life in accordance with the technical criteria and guidelines herein. The user is responsible for retaining all documentation for each PVHO and its associated systems, and shall establish a program of periodic inspection to determine the need for repair or replacement of any part, in accordance with the requirements listed in this Standard. For window repair and replacement requirements, refer to Section 2, Viewports.
1-3 IN-SERVICE EVALUATIONS, REPAIRS, AND MODIFICATION OF PVHOs 1-3.1 In-Service PVHO Evaluation and Testing 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.ASME PVHO-2 pdf download.