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Oklahoma Statutes - Title 40. Labor Page 221 internal inspection where construction permits; otherwise it shall be as complete an inspection as possible. Such boilers shall also be externally inspected annually preferably while under pressure; 2. Low pressure steam or vapor heating boilers shall receive an external inspection annually with an internal inspection at least every two (2) years where construction permits; 3. Hot water heating and hot water supply boilers shall receive an external inspection annually with an internal inspection at the discretion of the inspector; 4. Hot water supply heaters shall receive a certificate inspection annually, if possible, but biennially as a minimum; 5. Pressure vessels, excluding those within the scope of the American Petroleum Institute Pressure Vessel Inspection Code, subject to internal corrosion and waste heat steam generators shall receive an internal inspection triennially where construction permits. Pressure vessels not subject to internal corrosion shall receive an inspection at intervals set by the Commissioner. Frequency of external inspections of pressure vessels shall be set by the Commissioner; 6. A grace period of two (2) months beyond the periods specified in paragraphs 1, 2, 3, 4 and 5 of this subsection is permitted between inspections; however, the inspection due date shall not be affected; provided, however, for an entity with two or more boilers or pressure vessels, the Commissioner may allow all inspections of the boilers or pressure vessels to be conducted at that location at the same time; 7. The Commissioner of Labor may provide for longer periods between inspections in the rules for specific boilers and pressure vessels; and 8. Under the provisions of the Boiler and Pressure Vessel Safety Act, the Commissioner of Labor is responsible to provide rules for the safety of life, limb and property and therefore has jurisdiction over the interpretation and application of the inspection requirements as provided for in the rules. Inspection during construction and installation shall certify as to the minimum requirement for safety as defined in the American Society of Mechanical Engineers Code or other construction standards acceptable to the Commissioner of Labor. Inspection requirements of operating equipment shall be in accordance with generally accepted practice and compatible with the actual service condition, such as: a. previous experience, based on records of inspection, performance and maintenance, b. location, with respect to personnel hazard, c. quality of inspection and operating personnel, d. provision for related safe operating controls, and e. interrelation with other operations outside the scope of the Boiler and Pressure Vessel Safety Act.