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

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Stamping:
Where appropriate, the following National Board stamps or ASME Code symbol stamps are required:
1. National Board: R, VR.
2. ASME Code: A, E, H, HLW, HV, M, PP, S, U, UM, UV, V.
ObJeCtS SUbJeCt tO rUleS FOr COnStrUCtIOn anD StampInG
All boilers and pressure vessels, except the following:
1. Boilers and pressure vessels under federal inspection and control.
2. Unfired pressure vessels meeting the requirements of the US Department of Transportation for the shipment of liquids
or gases under pressure.
3. Containers for storage of liquified compressed flammable gases under the jurisdiction of other agencies.
4. Unfired pressure vessels with a nominal water-containing capacity of 120 gallons or less for containing liquid under
pressure, including those containing air, the compression of which serves as a cushion.
5. Hot-water supply boilers and hot-water heating boilers which are directly fired with oil, gas, or electricity, when none of
the following limitations is exceeded:
a. Heat input of 200,000 BTU per hour;
b. Water temperature of 200°F;
c. A nominal water-containing capacity of 120 gallons, except that such hot-water supply boilers shall be equipped
with a proper size, type and capacity safety relief valve as set forth in Section IV of the ASME Boiler and Pressure
Vessel Code;
d. An operating pressure not exceeding 160 psi.
6. Unfired pressure vessels designed for a pressure not exceeding 15 psig.
7. Pressure vessels not exceeding:
a. 5 cubic feet in volume and 250 psi design 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;
d. 3 cubic feet in volume and 350 psi design pressure.
8. Unfired pressure vessels containing water and filtering material for use in irrigation of land.
9. Unfired pressure vessels for the storage of cold water.
10. Electrically heated sterilizers or steam cookers when neither of the following limitations is exceeded:
a. Heat input of 3 kilowatts;
b. Volume of 1-1/2 cubic feet.
ObJeCtS SUbJeCt tO rUleS FOr FIelD InSpeCtIOn
Same as OBJECTS SUBJECT TO RULES FOR CONSTRUCTION AND STAMPING, except the following:
1. A steam or vapor boiler used for heating purposes, carrying a pressure of not more than 15 psig, which is installed in a
private residence or in an apartment house with fewer than six family units.
2. A hot-water heating boiler or a hot-water supply boiler, operated at pressures not exceeding 160 psig or temperatures
not exceeding 250°F, which is installed in a private residence or in an apartment house with fewer than six family units.
3. A pressure vessel operating entirely full of water or other liquid not materially more hazardous than water with
temperature not exceeding 185°F and including those containing air, the compression of which serves only as a cushion,
or airlift pumping system.
4. Pressure vessels, the contents of which are known to be noncorrosive to the materials of which the shell, head 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; except those used to contain lethal substances or compressed air.
2013 National Board Synopsis of Boiler and Pressure Vessel Laws, Rules and Regulations