Laws, Rules and Regulations - The National Board of Boiler and ...

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4. Air tanks installed on the right-of-way of railroads and used directly in the operation of trains.
5. Pressure vessels that do not exceed:
a. 5 cubic feet in volume and 250 psig pressure;
b. 1-1/2 cubic feet in volume and 600 psig pressure;
c. An inside diameter of 6 inches with no limitation on pressure.
6. Pressure vessels operating at a working pressure not exceeding 15 psig.
7. Vessels with a nominal water-containing capacity of 120 gallons or less for containing water under pressure, including
those also containing air, the compression of which serves only as a cushion.
8. Boilers and pressure vessels constructed and operated under licenses and permits granted by the Nuclear Regulatory
Commission.
9. Boilers and pressure vessels used in connection with the production, treatment, processing, storage, or transportation
of oil or gas, when located in remote areas. The department will determine remote areas on a case-by-case basis.
ObJeCtS SUbJeCt tO rUleS FOr FIelD InSpeCtIOn
Same as OBJECTS SUBJECT TO RULES FOR CONSTRUCTION AND STAMPING, except:
1. Heating boilers located in private residences or apartment houses of fewer than six family units.
2. Pressure vessels containing only water under pressure for domestic supply purposes, including those containing air,
the compression of which serves only as a cushion, or airlift pumping systems when located in private residences or in
apartment houses of fewer than six family units, or those serving rural water systems.
3. Pressure vessels covered under the Liquified Compressed Gas Equipment Inspection Law of Mississippi (Sections 75-57-1
through 75-57-63), Mississippi Code of 1972.
4. Air-receiving tanks and attached tanks used in connection with automobile filling stations that do not exceed 15 cubic
feet in volume and 250 psig pressure and used primarily to increase pressure in automobile tires.
InSpeCtIOnS reQUIreD
1. Power boilers and high-pressure, high-temperature water boilers shall receive a certificate inspection annually (or as the
board may require) and shall receive an annual external inspection while under pressure, if possible.
2. Heating boilers shall receive a certificate inspection biennially.
3. Pressure vessels subject to internal corrosion shall receive a certificate inspection biennially.
4. Pressure vessels not subject to internal corrosion shall receive a certificate inspection at intervals set by the board. But
internal inspection shall not be required of pressure vessels, the contents of which are known to be noncorrosive to
the material of which the shell, heads, or fittings are constructed, either from the chemical composition of the contents
or from evidence that the contents are adequately treated with a corrosion inhibitor, or from evidence that the vessel
parts are isolated from the contents with a corrosion resistant lining, provided that such vessels are constructed in accordance
with the rules and regulations of the board, and provided further that evidence proving noncorrosiveness is
approved by the board.
5. Vessels in nuclear installations other than those licensed by National Regulatory Commission shall be inspected and
reported in such form and with such appropriate information as the board shall designate.
6. A grace period of two months beyond the periods specified in paragraphs (a), (b), (c), and (d) of the rules and regulations
may elapse between certificate inspections.
7. The board may, at its discretion, permit longer periods between certificate inspections.
InSUranCe InSpeCtIOn reQUIrementS
1. Inspections made by insurance company inspectors commissioned by the board are accepted in lieu of inspections
made by a department inspector.
2. Insurance companies shall notify the chief inspector within 30 days of all boilers or pressure vessels on which insurance
is written, canceled, or renewed. Insurance companies shall notify the chief inspector immediately if insurance is refused
or suspended because of unsafe conditions and submit a report of the defects. Inspection reports shall be submitted to the
chief inspector within 30 days from date of inspection on standard forms for states operating under the ASME Code.
When hazardous conditions affecting the safety of a boiler or pressure vessel are found to exist at the time of any
inspection, the inspector shall report such conditions immediately to the chief inspector.
2013 National Board Synopsis of Boiler and Pressure Vessel Laws, Rules and Regulations