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

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6. Unfired pressure vessels having an external or internal working pressure not exceeding 15 psig.
7. Unfired pressure vessels that do not exceed 6 inches inside diameter.
8. Unfired pressure vessels containing water heated by steam or other indirect means, and directly fired hot-water supply
boilers or heaters, when none of the following is exceeded:
a. Heat input of 200,000 BTU per hour;
b. Water temperature of 210°F;
c. Normal water-containing capacity of 120 gallons.
9. Boilers and pressure vessels operated and maintained by public utility.
ObJeCtS SUbJeCt tO rUleS FOr FIelD InSpeCtIOn
Same as OBJECTS SUBJECT TO RULES FOR CONSTRUCTION AND STAMPING, except the following:
1. Boilers and pressure vessels located on farms and used solely for agricultural or horticultural purposes.
2. Heating boilers or pressure vessels which are located in private residences or in apartment houses of fewer than six family
units.
3. Any pressure vessels used as an external part of an electrical circuit breaker or transformer.
4. Pressure vessels on remote oil or gas production lease locations that have fewer than 10 buildings intended for human
occupancy per 0.25 square miles and where the closest building is at least 220 yards from any vessel.
5. Pressure vessels used for the storage of liquid propane gas under the jurisdiction of the state fire marshal, except for pressure
vessels used for storage of liquid propane gas that are 2,000 gallons or above and have been modified or altered.
6. Air storage tanks not exceeding 16 cubic feet (120 gallons) in size and under 250 psig pressure.
InSpeCtIOnS reQUIreD
1. Power and high-temperature water boilers shall receive a certificate inspection annually, internal inspection where
construction permits, otherwise it shall be as complete an inspection as possible. Such boilers shall also be inspected
externally while under operation pressure.
2. Low-pressure steam and vapor boilers shall receive a certificate inspection biennially with an internal inspection quadrennially
where construction permits.
3. Hot-water heating and hot-water supply boilers shall receive a certificate inspection biennially with an internal inspection
at the discretion of the inspector.
4. Hot-water heaters over 200,000 BTU per hour or 120 gallon capacity.
5. Pressure vessels subject to internal corrosion shall receive a certificate inspection quadrennially with an internal inspection
at the discretion of the inspector. All other pressure vessels shall be inspected at intervals set by the board, with at least
a quadrennial certificate inspection. Pressure vessels that are fired with gas, oil, or other means, such as electricity, are
considered boilers and inspected as required above.
InSUranCe InSpeCtIOn reQUIrementS
1. Inspections made by inspectors employed by insurance companies and commissioned by the department are accepted
in lieu of inspections made by the department. Reports of inspections must be filed with the department within 30 days
following each inspection on forms as promulgated by the commissioner.
2. The department must be notified of new business or discontinuance of insurance within 30 days. Suspension of insurance or
refusal to issue an operating permit due to unsafe conditions requires immediate notification of the chief engineer with a copy
of the inspection report.
CertIFICate OF InSpeCtIOn
1. Certificate of Inspection is issued by the department. This inspection certificate is valid for not more than 12 months for
high-pressure power boilers; 24 months for low-pressure heating boilers, hot-water supply boilers, and heaters; and 48
months for pressure vessels. Each certificate has a 60-day grace period.
2013 National Board Synopsis of Boiler and Pressure Vessel Laws, Rules and Regulations