30 CFR § 57.13015
Inspection of compressed-air receivers and other unfired pressure vessels.
(a) Compressed-air receivers and other unfired pressure vessels shall
be inspected by inspectors holding a valid National Board Commission and in
accordance with the applicable chapters of the National Board Inspection
Code, a Manual for Boiler and Pressure Vessel Inspectors, 1979. This code is
incorporated by reference and made a part of this standard. It may be
examined at any Metal and Nonmetal Mine Safety and Health District Office of
the Mine Safety and Health Administration, and may be obtained from the
publisher, the National Board of Boiler and Pressure Vessel Inspectors, 1055
Crupper Avenue, Columbus, Ohio 43229.
(b) Records of inspections shall be kept in accordance with
requirements of the National Board Inspection Code, and the records shall be
made available to the Secretary or his authorized representative.