- (a) All unfired pressure vessels for use with compressed air or subject to internal corrosion shall be provided with suitable manhole, handhole, or other inspection openings for examination and cleaning, except that such openings may be omitted from vessels containing compressed air when the actual service conditions or other material stored in them are such that the vessel is not subject to internal corrosion.
- (b) All access and inspection openings in a shell or unstayed head shall be designed in accordance with Section VIII Division 1 of the ASME Boiler and Pressure Vessel Code, as adopted by 20 CAR § 880-701.