Application of standards - Repairs

These rules apply only to new construction, except as noted below: 1. Reinstalled pressure vessels must meet the rules for new construction. Exception: national board registration is required only for those vessels ordered and constructed after November 1, 1987. 2. Repairs to unfired pressure vessels and to safety and safety relief valves for those vessels: a. Repairs to safety valves and safety relief valves must be such that valve function is not impaired and the repaired valve will perform to the standards for which it was originally constructed. It is recommended that these repairs be made by a firm in possession of a valid "VR" certificate of authorization from the national board of boiler and pressure vessel inspectors. b. Repairs to unfired pressure vessels must be such that vessels repaired will be returned to a safe and satisfactory operating condition, provided there is not deviation from the original design. It is recommended that these repairs be made by a firm in possession of a valid "R" certificate of authorization from the national board of boiler and pressure vessel inspectors. c. The National Board Inspection Code and the American Petroleum Institute Code (ANSI/API-510, 2006 edition) cover repair and alteration procedures. The American Petroleum Institute Code ANSI/API-510 may be used to cover the maintenance inspection, repair, alteration, and rerating procedure for pressure vessels used by the petroleum and chemical process industries. It is intended that ANSI/NB-23 cover installations other than those covered by ANSI/API-510. 3. Alterations to unfired pressure vessels: a. Alterations, as defined in ANSI/NB-23, must be made by a national board "R" certificate holder. b. Alterations may also be made by an organization operating under the provisions of ANSI/API-510, provided the alteration is within the scope of ANSI/API-510.