| • | "Condemned boiler or unfired pressure vessel" shall mean a boiler or unfired pressure vessel that has been inspected and declared unsafe or disqualified for further use by legal requirements and appropriately marked by an inspector. |
| • | "Expansion tank" shall mean a tank used to absorb excess water pressure. Expansion tanks installed in closed water heating systems and hot water supply systems shall meet the requirements of ASME Section IV, HG-709. |
| • | "Hot water heater" shall mean a closed vessel designed to supply hot water for external use to the system. All vessels must be listed by a nationally recognized testing agency and shall be protected with an approved temperature and pressure safety relief valve and shall not exceed any of the following limits: |
| * | Pressure of 160 psi (1100 kpa); |
| * | Temperature of 210 degrees F (99°C); |
| * | Capacity of 120 U.S. gallons (454 liters); |
| * | Input of 200,000 BTU/hr (58.58 kw). Note that if input exceeds 200,000 BTU/hr (58.58 kw), other terms defined in this section may apply. |
| * | Hot water heaters exceeding 200,000 BTU/hr (58.58 kw) must be ASME code stamped. |
| • | "Low pressure heating boiler" shall mean a steam or vapor boiler operating at a pressure not exceeding 15 psig or a boiler in which water or other fluid is heated and intended for operation at pressures not exceeding 160 psig or temperatures not exceeding 250 degrees F by the direct application of energy from the combustion of fuels or from electricity, solar or nuclear energy, excluding lined hot water heaters supplying potable hot water for external use to the system. |
| • | "Nonstandard boiler or unfired pressure vessel" shall mean a boiler or unfired pressure vessel that does not bear marking of the codes adopted in WAC 296-104-200. |
| • | "Power boiler" shall mean a boiler in which steam or other vapor is generated at a pressure of more than 15 psig for use external to itself or a boiler in which water is heated and intended for operation at pressures in excess of 160 psig and/or temperatures in excess of 250 degrees F by the direct application of energy from the combustion of fuels or from electricity, solar or nuclear energy. |
| • | "Reinstalled boiler or unfired pressure vessel" shall mean a boiler or unfired pressure vessel removed from its original setting and reset at the same location or at a new location without change of ownership. |
| • | "Rental boiler" shall mean any power or low pressure heating boiler that is under a rental contract between owner and user. |
| • | "Second hand boiler or unfired pressure vessel" shall mean a boiler or unfired pressure vessel of which both the location and ownership have changed after primary use. |
| • | "Standard boiler or unfired pressure vessel" shall mean a boiler or unfired pressure vessel which bears the marking of the codes adopted in WAC 296-104-200. |
| • | "Unfired pressure vessel" shall mean a closed vessel under pressure excluding: |
| * | Fired process tubular heaters; |
| * | Pressure containers which are integral parts of components of rotating or reciprocating mechanical devices where the primary design considerations and/or stresses are derived from the functional requirements of the device; |
| * | Piping whose primary function is to transport fluids from one location to another; |
| * | Those vessels defined as low pressure heating boilers or power boilers. |
| • | "Unfired steam boiler" shall mean a pressure vessel in which steam is generated by an indirect application of heat. It shall not include pressure vessels known as evaporators, heat exchangers, or vessels in which steam is generated by the use of heat resulting from the operation of a processing system containing a number of pressure vessels, such as used in the manufacture of chemical and petroleum products, which will be classed as unfired pressure vessels. |
| • | "Chief inspector" shall mean the inspector appointed under RCW 70.79.100 who serves as the secretary to the board without a vote. |
| • | "Deputy inspector" shall mean an inspector appointed under RCW 70.79.120. |
| • | "Special inspector" shall mean an inspector holding a Washington commission identified under RCW 70.79.130. |