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

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ObJeCtS SUbJeCt tO rUleS FOr COnStrUCtIOn anD StampInG
All boilers, except the following:
1. Those under federal control.
2. Swimming pool heaters and open car-wash heaters. Similar type equipment with no intervening valves on the return
or discharge piping, and having no reduction in pipe size in the return or discharge piping (not generating more than
normal circulating pump pressure).
3. Miniature steam or marine engines for hobby usage.
4. Those used in power plants of self-propelled vehicles designed primarily for the transportation of persons or property
upon a highway, except vehicles used exclusively upon stationary rails or tracks.
5. Boilers used on mint farms for mint processing.
6. A nonvaporizing, organic-fluid boiler, if the boiler meets all of the following criteria:
a. The system is vented and does not have valves or restrictions in the pipe between the boiler and vent;
b. The vent pipe is sized so that the thermal expansion of the fluid will not result in an increase in pressure on the
system, which is verifiable with engineering data;
c. The owner/user provides the Boiler Division with calculations performed by an engineer which verify that pressure
due to thermal expansion cannot exist in the boiler as installed.
7. Coil type Hot Water Boiler:
As referenced in ASME Section I PG-2
8. A low-pressure steam boiler that has a volume of less than 5 cubic feet and that does not have piped feed connections.
9. A water tube or coil-type hot water heating boiler requiring forced circulation not exceeding any one of the following:
a. Maximum water design temperature of 200 degrees Fahrenheit.
b. Relief valve set pressure of 30 psi.
c. Heat input of 200,000 BTU/hr.
Exception: Modular or multiple boiler installations exceeding 1,000,000 BTU/hr input are not exempt.
10. Those on Tribal Land.
ObJeCtS SUbJeCt tO rUleS FOr FIelD InSpeCtIOn
Same as OBJECTS SUBJECT TO RULES FOR CONSTRUCTION AND STAMPING, except:
1. Boilers used solely for agricultural purposes.
2. Steam or vapor boilers not exceeding 15 psi and hot-water boilers not exceeding 160 psi or a temperature of 250°F
(located in private residences or apartment or condo buildings of fewer than six families).
InSpeCtIOnS reQUIreD
1. A power boiler, process boiler, or high-pressure, high-temperature water boiler shall receive a certificate inspection
annually and shall also be externally inspected annually, while under pressure, within six months from the date of the
internal inspection.
2. A low-pressure steam or vapor heating boiler shall receive a certificate inspection biennially.
3. Hot-water heating and hot-water supply boilers shall receive a certificate inspection triennially.
4. A nonvaporizing, organic-fluid boiler that is not exempt under these rules shall receive an external certificate inspection
triennially.
5. A miniature hobby locomotive boiler shall receive a certificate inspection annually.
6. Antique traction boilers: triennial inspection for noncommercial, and annual inspection for commercial.
All inspections of newly installed and secondhand boilers must be made by a department inspector.
InSUranCe InSpeCtIOn reQUIrementS
1. Inspections, except first inspections and inspections of secondhand boilers, made by inspectors employed by insurance
companies and licensed by the department are accepted in lieu of inspections made by a department inspector.
2013 National Board Synopsis of Boiler and Pressure Vessel Laws, Rules and Regulations