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

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3. Air tanks installed on the right-of-way of railroads and used directly in the operation of trains.
4. Air tanks located on vehicles operating under the rules of other state authorities and used for carrying passengers or
freight.
5. Pressure vessels operating at a working pressure not exceeding 15 psig. Vessels for 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.
6. Hot-water supply boilers directly fired with oil, gas, or electricity when none of the following limitations is exceeded:
a. A heat input of 200,000 BTU per hour;
b. A water temperature of 210°F;
c. A nominal water-containing capacity of 120 gallons.
7. 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.
8. Mechanical devices of the following types:
a. Pumps;
b. Compressors;
c. Turbines;
d. Generators;
e. Hydraulic and pneumatic cylinders.
9. Water-containing part of air conditioning or refrigeration system condensers or evaporators:
a. Using halo carbon refrigerant;
b. Constructed in accordance with the requirements of ANSI/ASH RAE Standard 15 in effect at the time of construction;
c. If neither of the following limitations is exceeded:
i. Design pressure of 300 psig;
ii. Design temperature of 210°F.
ObJeCtS SUbJeCt tO rUleS FOr FIelD InSpeCtIOn
Same as OBJECTS SUBJECT TO RULES FOR CONSTRUCTION AND STAMPING, except:
1. Boilers or pressure vessels located on farms and used solely for agricultural purposes.
2. Heating boilers which are located in private residences or in apartment houses of fewer than six family units.
3. 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 system, when located in private residences or in apartment
houses of fewer than six family units.
InSpeCtIOn reQUIrementS
1. Power boilers and high-pressure, high-temperature boilers:
a. Annual internal inspection when construction permits; otherwise, as complete an inspection as possible;
b. Annual external inspection while under pressure, if possible.
2. Low-pressure boilers: a biennial certificate inspection.
3. Pressure vessels: a biennial certificate inspection.
4. Amusement attractions with low-pressure boiler and pressure vessel parts: annual certificate inspection.
2013 National Board Synopsis of Boiler and Pressure Vessel Laws, Rules and Regulations