Hawaii Administrative Rules
Title 12 - DEPARTMENT OF LABOR AND INDUSTRIAL RELATIONS
Subtitle 8 - HAWAII OCCUPATIONAL SAFETY AND HEALTH DIVISION
Part 10 - PRESSURE RETAINING ITEMS
Chapter 222.1 - POWER BOILERS
Section 12-222.1-13 - Controls and heat-generating apparatus
Current through January, 2025
(a) Oil and gas-fired and electrically heated boilers shall be equipped with suitable primary (flame safe-guard) safety controls, safety limit switches and controls, and burners or electric elements as required by a nationally or internationally recognized standard.
(b) The symbol of the certifying organization that has approved such equipment as having complied with a nationally recognized standard shall be affixed to the equipment and shall be considered as evidence that the unit was manufactured in accordance with that standard.
(c) These devices shall be installed in accordance with departmental, environmental requirements, manufacturer's recommendations, and industry standards, as applicable.
(d) Each automatically fired steam boiler shall be protected from overpressure by two pressure operated controls.
(e) Each individual steam boiler or each system of commonly connected steam boilers shall have a control that will cut off the fuel supply when the steam pressure reaches an operating limit, which shall be less than the maximum allowable working pressure.
(f) Each individual automatically fired steam boiler shall have a safety limit control, with a manual reset, that will cut off the fuel supply to prevent steam pressure from exceeding the maximum allowable working pressure of the boiler. Each control shall be constructed to prevent a pressure setting above the maximum allowable working pressure of the boiler.
(g) Shutoff valves of any type shall not be placed in the steam pressure connection between the boiler and the controls described in subsections (e) and (f). These controls shall be protected with a siphon or equivalent means of maintaining a water seal that will prevent steam from entering the control. The connections to the boiler shall not be less than NPS 1/4 (DN 8) for lengths up to and including five (5) feet (1.5 meters), and not less than NPS 1/2 (DN 15) for lengths over five (5) feet (1.5 meters), but where steel or wrought iron pipe or tubing is used, they shall not be less than NPS 1/2 (DN 15) for lengths up to and including five (5) feet (1.5 meters), and not less than NPS 1 (DN 25) for lengths over five (5) feet (1.5 meters). The minimum size of an external siphon shall be NPS 1/4 (DN 8) or 3/8 inch (10 milimeters) outside diameter nonferrous tubing.
