ADOPTS WITH AMENDMENTS:

International Mechanical Code 2018 (IMC 2018)

Heads up: There are no amended sections in this chapter.

1001.1 Scope

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The purpose of this chapter is to establish and provide minimum standards for the protection of the public welfare, health, safety and property by regulating and controlling the installation of steam and hot water boilers, water heaters, pressure vessels and their related piping that are not regulated by the Boiler Code or the Plumbing Code.

1002.1 General

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Potable water heaters and hot water storage tanks shall be listed and labeled and installed in accordance with the manufacturer's instructions, the Plumbing Code and, where applicable, this code. Water heaters shall be capable of being removed without first removing a permanent portion of the building structure. The potable water connections and relief valves for all water heaters shall conform to the requirements of the Plumbing Code.

1002.2 Water Heaters Utilized for Space Heating

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Water heaters utilized both to supply potable hot water and provide hot water for space-heating applications shall be listed and labeled for such applications by the manufacturer and shall be installed in accordance with the manufacturer's instructions and the Plumbing Code.
Water heaters utilized for both potable water heating and space-heating applications shall be sized to prevent the space-heating load from diminishing the required potable water-heating capacity.
Where a combination potable water-heating and space-heating system requires water for space heating at temperatures higher than 140°F (60°C), a temperature-actuated mixing valve that conforms to ASSE 1017 shall be provided to temper the water supplied to the potable hot water distribution system to a temperature of 140°F (60°C) or less.

1002.3 Supplemental Water-Heating Devices

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Potable water-heating devices that utilize refrigerant-to-water heat exchangers shall be approved and installed in accordance with the Plumbing Code and the manufacturer's instructions.

Section 1003 Boilers and Pressure Vessels

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1003.1 General

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The requirements of this section shall apply to the boiler rooms, combustion air, chimneys, vents and fuel piping related to the construction, installation, repair and alteration of rooms for the installation of boilers and pressure vessels.

1003.2 Piping

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1003.2 Standards

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Boilers and pressure vessels that are not regulated by the Boiler Code shall be designed and constructed in accordance with the requirements of their listing and labeling or the applicable standards for their use.

1003.3 Welding

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1003.3 Installation

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In addition to the requirements of this code, the installation of boilers and pressure vessels that are not regulated by the Boiler Code shall conform to the manufacturer's instructions. Operating instructions of a permanent type shall be attached to the boiler. Boilers shall have all controls set, adjusted and tested by the installer. The manufacturer's rating data and the nameplate shall be attached to the boiler.

1003.4 Workmanship

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All equipment, appurtenances, devices and piping shall be installed in a workmanlike manner conforming to the provisions and intent of this chapter.

Section 1004 Boilers

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Section 1004 Permits Required

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1004.1 Permits

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It shall be unlawful to install any boiler or pressure vessel regulated by this code or the Boiler Code without first obtaining a permit from the local municipality and an installation permit from the Oregon Building Codes Division, Boiler and Pressure Vessel Program. Permits obtained from the local municipality shall apply to the boiler rooms, combustion air, chimneys, vents, and fuel and hydronic piping related to the construction, repair and alteration of rooms for the installation of boilers and pressure vessels and the installation of any boiler or pressure vessel regulated by this code.

1004.1 Standards

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1004.2 Installation

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1004.3 Working Clearance

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1004.3.1 Top Clearance

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1004.4 Mounting

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1004.5 Floors

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1004.6 Boiler Rooms and Enclosures

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1004.7 Operating Adjustments and Instructions

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Section 1005 Boiler Connections

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Section 1005 Detailed Requirements

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1005.1 Safety Requirements

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The installation of all boilers and pressure vessels not regulated by the Boiler Code shall conform to the minimum requirements for safety established by this code.

1005.1.1 Safety Relief Valves for Hot Water Boilers

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Hot water boilers shall be protected with a safety relief valve.

1005.1.2 Pressure Relief for Pressure Vessels

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All pressure vessels shall be protected with a pressure relief valve or pressure-limiting device as required by the manufacturer's installation instructions for the pressure vessel.

1005.2 Stack Dampers

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Stack dampers on boilers fired with oil or solid fuel that are not regulated by the Boiler Code shall not close more than 80 percent of the stack area when closed, except on automatic boilers with prepurge, automatic draft control and interlock. Operative dampers shall not be placed within any stack, flue or vent of a gas-fired boiler, except on an automatic boiler with prepurge, automatic draft control and interlock.

1005.1 Valves

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1005.2 Potable Water Supply

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Section 1006 Safety and Pressure Relief Valves and Controls

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Section 1006 Expansion Tanks

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1006.1 Expansion Tanks

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Expansion tanks shall be securely fastened to the structure; supports shall be adequate to carry twice the weight of the tank filled with water without placing any strain on connecting piping.

     All water heating systems incorporating hot water tanks or fluid relief columns shall be installed to prevent freezing under normal operating conditions.

     An expansion tank shall be installed in every hot water system. For multiple boiler installations, not less than one expansion tank is required. Expansion tanks shall be of the closed or open type. Tanks shall be rated for the pressure of the hot water system.

1006.1 Safety Valves for Steam Boilers

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1006.2 Safety Relief Valves for Hot Water Boilers

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1006.3 Pressure Relief for Pressure Vessels

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1006.4 Approval of Safety and Safety Relief Valves

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1006.5 Installation

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1006.6 Safety and Relief Valve Discharge

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1006.7 Boiler Safety Devices

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1006.8 Electrical Requirements

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Section 1007 Boiler Low-Water Cutoff

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Section 1007 Safety or Relief Valve Discharge

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1007.1 General

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The discharge from relief valves for water heaters and boilers not regulated by the Boiler Code shall be piped to within 18 inches (457 mm) of the floor or to an open receptacle, and when the operating temperature is in excess of 212°F (100°C), shall be equipped with a splash shield or centrifugal separator. Where the discharge from safety valves would result in a hazardous discharge of steam inside the boiler room, such discharge shall be extended outside the boiler room. Valves are prohibited between the safety valve and the atmosphere.

1007.1 General

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1007.2 Operation

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Section 1008 Bottom Blowoff Valve

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Section 1008 Gas Pressure Regulators

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1008.1 General

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An approved gas pressure regulator shall be installed on gas-fired boilers not regulated by the Boiler Code where the gas supply pressure is higher than that at which the main burner is designed to operate. A separate approved gas pressure regulator shall be installed to regulate the gas pressure to the pilot or pilots. A separate regulator shall not be required for the pilot or pilots on manufacturer-assembled boiler-burner units that have been approved by the building official and on gas-fired boilers in Group R occupancies of less than six units and in Group U occupancies.

1008.1 General

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1008.2 Discharge

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Section 1009 Hot Water Boiler Expansion Tank

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Section 1009 Clearance for Access

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1009.1 Access

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Where boilers not regulated by the Boiler Code are installed or replaced, clearance shall be provided to allow access for inspection, maintenance and repair, and passageways shall have an unobstructed width of not less than 18 inches (457 mm). Clearance for repair and cleaning may be provided through a door or access panel into another area, provided the opening is of sufficient size. Package boilers, miniature boilers, low-pressure boilers and hot water supply boilers with no manhole on top of shell shall have a minimum clearance of 2 feet (610 mm) from the ceiling.

1009.1 Where Required

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1009.2 Closed-Type Expansion Tanks

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1009.3 Open-Type Expansion Tanks

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Section 1010 Gauges

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Section 1010 Boiler Room Enclosures

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1010.1 Boiler Rooms

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Boiler rooms and enclosures and access thereto shall comply with Chapter 3 and the Building Code.

1010.1 Hot Water Boiler Gauges

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1010.2 Steam Boiler Gauges

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1010.2.1 Water-Gauge Glass

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Section 1011 Tests

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1011.1 Tests

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1011.2 Test Gauges

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Section 1011 Floors

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1011.1 General

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Boilers shall be mounted on floors of noncombustible construction unless listed for mounting on combustible floors. The floor and related structural supports shall be designed as required in the Building Code to carry the loads imposed by the boiler and appurtenances.

Section 1012 Chimneys or Vents

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1012.1 General

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Where required, boilers shall be connected to a chimney or vent in accordance with Chapter 8 for oil or wood and Appendix C for fuel gas installations.

Section 1013 Drainage

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1013.1 Drains

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The boiler room shall have an approved floor drain or equivalent means for disposing of accumulation of liquid wastes incidental to cleaning or recharging.

Section 1014 Fuel Supply Piping

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1014.1 Piping

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Fuel supply piping shall conform to Chapter 13, Appendix C or the standards cited in Chapter 15.

Section 1015 Air for Combustion and Ventilation

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1015.1 General

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Air for combustion and ventilation shall be installed in accordance with Chapter 7 or Appendix C.

Section 1016 Steam and Hot Water Piping

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Note: Boilers and pressure vessels and related piping are regulated by the Boiler Code. See ORS 480.510 to 480.670.

1016.1 General

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Steam piping is regulated under the jurisdiction of the Oregon Boiler and Pressure Vessel Law and related administrative rules and is under the jurisdiction of the Building Codes Division, Boiler and Pressure Vessel Program.

1016.1.1 Hot Water Piping Systems

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Water piping used for hot water heating systems and hydronics shall be installed in accordance with Chapter 12.
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