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 223.1 - HEATING BOILERS - STEAM HEATING BOILERS, HOT-WATER HEATING BOILERS, HOT-WATER SUPPLY BOILERS, AND POTABLE WATER HEATERS
Section 12-223.1-8 - Modular steam heating, modular hot-water heating boilers, and modular water heaters

Universal Citation: HI Admin Rules 12-223.1-8

Current through November, 2024

(a) Individual modules. The following shall apply to individual modules:

(1) The individual modules shall comply with all the requirements of the code of construction and this subsection. The individual modules shall be limited to a maximum input of 400,000 Btu per hour (117 kw/hr) for gas, 3 gallons/hour (11.4 l/hr) for oil, or 117 kw for electricity;

(2) Each module of a modular steam heating boiler shall be equipped with a:

(A) Safety valve, see section 12-223.1-9(a)(1);

(B) Blowoff valve, see section 12-223.1-13(o)(1); and

(3) Each module of a modular hot-water heating boiler shall be equipped with a:

(A) Safety relief valve, see section 12-223.1-9(a)(2); and

(B) Drain valve, see section 12-223.1-13(o)(2).

(b) Assembled Modular Heating boilers. The following shall apply to assembled modular heating boilers:

(1) The individual modules shall be manifolded together at the job site without any intervening valves;

(2) The assembled modular steam heating boiler shall also be equipped with a:

(A) Feedwater connection, see Exhibit 5, titled, "Steam Boilers in Battery -Pumped Return Acceptable Piping Installation", dated October 1, 2023, which is made a part of this chapter and located at the end of this chapter, and Exhibit 6, titled, "Steam Boilers in Battery - Gravity Return Acceptable Piping Installation", dated October 1, 2023, which is made a part of this chapter and located at the end of this chapter; and

(B) Return pipe connection, see Exhibit 5, titled, "Steam Boilers in Battery -Pumped Return Acceptable Piping Installation", dated October 1, 2023, which is made a part of this chapter and located at the end of this chapter, and 6, titled, "Steam Boilers in Battery -Gravity Return Acceptable Piping Installation", dated October 1, 2023, which is made a part of this chapter and located at the end of this chapter; and

(3) The assembled modular hot-water boiler shall also be equipped with a:

(A) Makeup water connection, see Exhibit 7, titled, "Hot Water Boilers in Battery Acceptable Piping Installation", dated October 1, 2023, which is made a part of this chapter and located at the end of this chapter;

(B) Provision for thermal expansion, see Exhibit 7, titled, "Hot Water Boilers in Battery Acceptable Piping Installation", dated October 1, 2023, which is made a part of this chapter and located at the end of this chapter, and Exhibit 8, titled, "Expansion Tank Capacities for Gravity Hot-Water Systems", dated October 1, 2023, which is made a part of this chapter and located at the end of this chapter; and

(C) Stop valves (treating the assembled modular boiler as a single unit), see Exhibit 7, titled, "Hot Water Boilers in Battery Acceptable Piping Installation", dated October 1, 2023, which is made a part of this chapter and located at the end of this chapter.

(1) Each module of a modular hot-water heating boiler shall be equipped with a:

(A) Pressure or altitude gage, see section 12-223.1-7(b)(1);

(B) Thermometer, see section 12-223.1-7(b)(2); and

(2) The assembled modular hot-water heating boiler shall be equipped with a:

(A) Temperature control, see 12-223.1-7(b)(3)(B); and

(B) Low-water fuel cutoff, see 12-223.1-7(b)(4).

(d) Modular steam heating boilers. The following shall apply to modular steam heating boilers:

(1) Each module of a modular steam boiler shall be equipped with a:

(A) Steam gage, see section 12-223.1-7(a)(1);

(B) Water-gage glass, see section 12-223.1-7(a)(2);

(D) Low-water cutoff, see section 12-223.1-7(a)(5); and

(2) The assembled modular steam heating boiler shall also be equipped with a pressure control, see section 12-223.1-7(a)(4)(B).

(e) Modular water heaters. The individual modules shall comply with all the requirements of the code of construction and this paragraph. Each module of a modular water heater shall be equipped with a:

(1) Safety relief valve, see section 12-223.1-9(a)(3);

(2) Drain valve, see section 12-223.1-13(o)(2);

(3) Pressure or altitude gage, see section 12-223.1-7(c)(2);

(4) Thermometer, see section 12-223.1-7(c)(3);

(5) Temperature control, see section 12-223.1-7(c)(1); and

(6) Flow-sensing device, see section 12-223.1-7(c)(4).

(f) Assembled modular water heaters having an aggregate input value greater than 200,000 Btu per hour or aggregate water containing capacity greater than 120 gallons. The individual modules shall be manifolded together at the job site with or without any intervening valves. The assembled modular potable water heater shall be equipped with a:

(1) Safety relief valve, see section 12-223.1-9(a)(3);

(2) Drain valve, see section 12-223.1-13(o)(2);

(3) Pressure/altitude gage, see 12-223.1-7(c)(2);

(4) Thermometer, see section 12-223.1-7(c)(3);

(5) Temperature control, see section 12-223.1-7(c)(1); and

(6) Flow-sensing device, see 12-223.1-7(c)(4).

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