Hawaii Administrative Rules › Title 12 - DEPARTMENT OF LABOR AND INDUSTRIAL RELATIONS › Subtitle 8 - HAWAII OCCUPATIONAL SAFETY AND HEALTH DIVISION › Part 10 - BOILER AND PRESSURE VESSEL › Chapter 222.1 - POWER BOILERS › Section 12-222.1-6 - Pressure relief valves for power boilers

Current through June,
				  2024
(a) General
				  requirements. The following shall apply to all power boilers:
(1) Each power boiler, miniature boiler,
				  electric boiler, and high-temperature water boiler shall have at least one ASME
				  and NB certified pressure relief valve marked with the ASME certification mark
				  and "V" designator, and National Board NB symbols;
(2) When a new boiler is installed, ASME Form
				  P-7 Manufacturer's Data Report for Pressure Relief Valves, or ASME Form P-8
				  Manufacturer's or Assembler's Certificate of Conformance for Pressure Relief
				  Valves, as required by the ASME BPVC, shall be submitted along with the
				  manufacturer's data on the power boiler;
(3) Only direct spring-loaded pressure relief
				  valves or pilot operated pressure relief valves designed to relieve steam shall
				  be used for steam service;
(4)
				  Safety relief valves are valves designed to relieve either steam or water,
				  depending on the application;
(5)
				  Deadweight or weighted-lever pressure relief valves shall not be
				  used;
(6) For high-temperature
				  water boilers, safety relief valves shall have a closed bonnet, and valve
				  bodies shall not be constructed of cast iron;
(7) At least one NB capacity certified
				  pressure relief valve shall be installed on the boiler. If the boiler has more
				  than 500 square feet of heating surface, or if an electric boiler has a power
				  input of more than 1,100 kilowatts, two or more NB capacity certified pressure
				  relief valves shall be installed;
(8) The pressure relief valve capacity for
				  each boiler shall be so that the valve or valves will discharge all the steam
				  that can be generated by the boiler without allowing the pressure to rise more
				  than six per cent (6%) above the highest pressure to which any valve is set,
				  and in no case to more than six per cent (6%) above the maximum allowable
				  working pressure of the boiler. In no case shall the minimum relieving capacity
				  be less than the maximum designed steaming capacity as determined by the
				  manufacturer;
(9) One or more
				  pressure relief valves on the boiler proper shall be set at or below the
				  maximum allowable working pressure. If additional valves are used, the highest
				  pressure setting shall not exceed the maximum allowable working pressure by
				  more than three per cent (3%). The complete range of pressure settings of all
				  the pressure relief valves on a boiler shall not exceed ten per cent (10%) of
				  the highest pressure to which any valve is set;
(10) Adjustments, repairs, and reconditioning
				  of pressure relief valves shall be done by a National Board authorized "VR"
				  repair company. The "VR" repair company shall affix a "VR" nameplate to the
				  valve and provide repair documentation and the owner and user shall ensure that
				  the nameplate identification plates remain legible; and
(11) The owner and user shall maintain all
				  pressure relieving devices in good operating condition. When the valves cannot
				  be tested in service, the user shall maintain and make available to the
				  inspector records showing the test dates and set pressure for the
				  valves.