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

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5. Steam-heating boilers, hot-water heating boilers, and hot-water supply boilers, except those owned by municipalities or
located in school buildings, or those used as process boilers.
6. Pressure vessels used for the transportation and storage of compressed or liquified gases when constructed in compliance
with specifications of the US Department of Transportation.
7. Pressure vessels installed on the right-of-way of railroads and used directly in the operation of trains.
8. Pressure vessels located on vehicles operating under the rules of other state authorities and used for carrying passengers
or freight.
9. Pressure vessels located in private residences and apartment buildings with fewer than six apartments.
10. Pressure vessels having an internal or external operating pressure not exceeding 15 psi.
11. Vessels containing water under pressure, including those containing air, the compression of which serves only as a cushion,
when none of the following limitations is exceeded:
a. A design pressure of 300 psi;
b. A design temperature of 210°F.
12. Pressure vessels containing water heated by steam or any other direct or indirect means when none of the following
limitations is exceeded:
a. A heat input of 200,000 BTU per hour;
b. A water temperature of 200°F;
c. A nominal water-containing capacity of 120 gallons.
13. Pressure vessels not exceeding:
a. 5 cubic feet in volume and 250 psig;
b. 1-1/2 cubic feet in volume and 600 psig;
c. An inside diameter of 6 inches with no limitation on pressure.
14. Pressure vessels used as an integral part of a circuit breaker or transformer.
ObJeCtS SUbJeCt tO rUleS FOr FIelD InSpeCtIOn
Same as OBJECTS SUBJECT TO RULES FOR CONSTRUCTION AND STAMPING.
InSpeCtIOnS reQUIreD
1. High-pressure boilers:
a. One annual internal certificate inspection;
b. One annual external inspection, in operation, approximately six months from the certificate inspection.
2. Miniature boilers:
a. One annual certificate inspection;
b. One biennial internal inspection.
3. Cast-iron boilers: one annual certificate inspection while unit is in operation.
4. Low-pressure steel steam heating boilers (owned by municipalities or located in school buildings) or process boilers:
one annual certificate inspection, which shall be an internal inspection every third year, with an external or internal
inspection at the discretion of the inspector on the two intervening years.
5. Low-pressure steel hot-water supply boilers (owned by municipalities or located in school buildings) or process boilers:
one annual certificate inspection, which shall be an internal inspection where possible, every third year, with an external
or internal inspection at the discretion of the inspector during the two intervening years.
6. Low-pressure steel hot-water heating boilers (owned by municipalities or located in school buildings) or process boilers:
one annual certificate inspection, which shall be an internal inspection every third year, with an external inspection
during the two intervening years.
7. Low-pressure process boilers (owned by municipalities or located in school buildings) or process boilers: one annual
certificate inspection, which shall be an internal inspection every third year, with an external inspection during the two
intervening years.
2013 National Board Synopsis of Boiler and Pressure Vessel Laws, Rules and Regulations