North Dakota Administrative Code

1. The minimum safety valve or safety relief valve relieving capacity for all high-pressure boilers other than steam traction engines must be determined by the edition of the American Society of Mechanical Engineers Code, section 1, referenced in this article or by the requiremen…

The mounting of safety valves and safety relief valves must meet the requirements of the edition of the American Society of Mechanical Engineers Code, section 1, referenced in this article or by the requirements of the edition of the American Society of Mechanical Engineers Code,…

1. The operation of safety valves and safety relief valves must meet the requirements of the edition of the American Society of Mechanical Engineers Code, section 1, referenced in this article or by the requirements of the edition of the American Society of Mechanical Engineers C…

1. Each discharge outlet, except safety valve, safety relief valves, reheater inlet and outlet, or superheater inlet connections, must be fitted with a stop valve located at an accessible point in the steam-delivery line and as near the boiler nozzle as is convenient and practica…

1. Except for high-temperature water boilers, the feed piping must be provided with a check valve near the boiler and a valve or cock between the check valve and the boiler. When two or more boilers are fed from a common source, there also must be a globe or regulating valve on t…

1. A "blowoff" means a pipe connection provided with valves through which the water in the boiler may be blown out under pressure, excepting drains such as are used on water columns, gauge glasses, or piping of feedwater regulators, etc., used for the purpose of determining the o…

The minimum factor of safety may not be less than four for existing installations. The director authorizes an inspector to increase the factor of safety if the condition of the boiler or pressure vessel warrants it. If the owner or user does not concur with the inspector's decisi…

If in the opinion of the inspector, as the result of conditions disclosed at the time of inspection, it is advisable to remove the interior or exterior lining, covering, or brickwork to expose certain parts of the vessel not normally visible, the owner or user shall remove such m…

Whenever repairs are made to fittings and appliances or it becomes necessary to replace them, the work must comply with the requirements for new installations. History: Effective July 1, 2020. General Authority: NDCC 23.1-16-07 Law Implemented: NDCC 23.1-16-07

1. Fire-actuated fusible plugs, if used, must conform to the requirements of the American Society of Mechanical Engineers Code for power boilers. 8 2. They may be replaced by steel plugs if the boiler is gas-fired or oil-fired and is equipped with a low water fuel cutoff. History…

1. Outlet connections (except for damper regulator, feedwater regulator, low-water fuel cutoff, drains, steam gauges, or such apparatus that does not permit the escape of an appreciable amount of steam or water therefrom) may not be placed on the piping that connects the water co…

1. Each steam boiler must have a steam gauge, with dial range not less than one and one-half times the pressure at which the safety valve is set, connected to the steam space or to the steam connection to the water column. The steam gauge must be connected to a siphon or equivale…

All steam traction engines that are of nonstandard boiler construction are limited to a maximum allowable working pressure of one hundred pounds per square inch [690 kilopascals], unless a thorough ultrasonic thickness survey, engineering analysis, and other inspections, approved…

1. It is the duty of the owner or user of any steam traction engine on wheels to notify the chief boiler inspector of sale or other disposition of steam traction engines. 2. Within ten days of purchase, any person purchasing any steam traction engine shall notify the chief boiler…

The National Board Inspection Code referenced in this article must be used for the inspection and repair of all steam traction engines unless otherwise noted in this article. History: Effective July 1, 2020. General Authority: NDCC 23.1-16-05 Law Implemented: NDCC 23.1-16-05 10…

1. All new boilers, except those exempt by law, to be installed in North Dakota must be reported to the chief boiler inspector by the owner or user and by the installer. 2. A miniature boiler, except one exempt by law, may not be installed in North Dakota unless it has been const…

The rules adopted for power boilers applying to strength of materials and calculations to determine maximum allowable working pressure must be used for miniature boilers unless a special rule is stated in those rules. History: Effective July 1, 2020. General Authority: NDCC 23.1-…

The maximum allowable working pressure for standard boilers on the shell of a boiler or drum must be determined by section 33.1-14-05-01. History: Effective July 1, 2020. General Authority: NDCC 23.1-16-07 Law Implemented: NDCC 23.1-16-07

Nonstandard miniature boilers: 1. Must conform to all requirements of this chapter. 2. Must have a factor of safety as given in subsection 5 of section 33.1-14-05-02. 3. Must be given an initial inspection that must include a hydrostatic pressure test. 4. May not have solder or s…

1. Each miniature boiler must be equipped with an American society of mechanical engineers approved safety valve set at or below the maximum allowable working pressure. 2. The safety valve must be plainly marked by the manufacturer showing name or identifying trademark, nominal d…

1. Each miniature boiler must be equipped with a water gauge glass for determination of water level. 2. The lowest permissible water level must be at a point one-third of the height of the shell, except where the boiler is equipped with internal furnace in which case it may not b…

1. Every miniature boiler must be provided with at least one feed pump or other mechanical feeding device except if the following conditions exist: a. If the boiler is connected to a water main or system having sufficient pressure to feed the boiler at any time while under pressu…

1. Each miniature boiler must be provided with a blowoff connection not less than one-half inch [12.7 millimeter] iron pipe size, directly connected with the lowest water space. 2. Blowoff piping may not be galvanized and must be provided with a valve or cock. History: Effective …

Each miniature boiler must be equipped with a steam gauge having a dial range not less than one and one-half times the safety valve setting. The gauge must be connected to the steam space or to the steam connection to the gauge glass by a brass or bronze composition siphon tube, …

The steam piping from a miniature boiler must be provided with a stop valve located as close to the boiler shell or drum as is practicable, except in those cases where the boiler and steam receiver are operated as a closed system. 3 History: Effective July 1, 2020. General Author…

Each gas-fired boiler must be equipped with a four inch [10.16 centimeter] vent pipe or flue extended to an approved location outside the building or connected to a chimney flue. If the horizontal run is more than ten feet [3.05 meters], the vent must be increased to six inches […

1. The owner and user of any steam traction engine or boiler on wheels shall notify the chief boiler inspector of sale or other disposition of steam traction engines. 2. Within ten days of purchase, any person purchasing any steam traction engine shall notify the chief boiler ins…

The steam pressure gauge must show the pressure at which the boiler is actually being operated. Adjustments to the gauge to show a lesser pressure are prohibited, and if any gauge has been so adjusted, such act will be considered a willful violation of this section. History: Effe…

1. Unless exempt by this article, a heating or low-pressure boiler may not be installed in this state unless it has been constructed, inspected, and stamped to conform with section IV of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code and is approved,…

The maximum allowable working pressure of a boiler built in accordance with the American Society of Mechanical Engineers Code may not exceed the pressure indicated by the manufacturer's identification stamped or cast upon the boiler or upon a plate secured to it. History: Effecti…

The maximum allowable working pressure on the shell of a noncode riveted heating boiler must be determined in accordance with section 33.1-14-05-01 except that the maximum allowable working pressure of a steam heating boiler may not exceed fifteen pounds [103 kilopascals] and a h…

The maximum allowable working pressure of a noncode steel or wrought iron heating boiler of welding construction may not exceed fifteen pounds [103 kilopascals]. For other than steam service, the maximum allowable working pressure must be calculated in accordance with section IV …

1. The maximum allowable working pressure of a noncode boiler composed principally of cast iron may not exceed fifteen pounds [103 kilopascals] for steam service or thirty pounds [206.85 kilopascals] for hot water service. 2. The maximum allowable working pressure of a nonstandar…

A radiator in which steam pressure is generated at a pressure of fifteen pounds [103 kilopascals] or less is considered a low-pressure boiler. History: Effective July 1, 2020. General Authority: NDCC 23.1-16-05 Law Implemented: NDCC 23.1-16-05

If in the judgment of the inspector, a boiler is unsafe for operation at the pressure previously approved, the pressure must be reduced, proper repair made, or the boiler retired from service. History: Effective July 1, 2020. General Authority: NDCC 23.1-16-05 Law Implemented: ND…

1. Safety valve requirements for steam boilers are: a. Each steam boiler must have one or more American Society of Mechanical Engineers approved safety valves of the spring-pop type adjusted and sealed to discharge at a pressure not to exceed fifteen pounds per square inch [103 k…

1. Each steam boiler must have a steam gauge or a compound steam gauge connected to its steam space or to its water column or to its steam connections. The gauge or connection must contain a siphon or equivalent device that will develop and maintain a water seal that will prevent…

1. Each steam boiler must have one or more water gauge glasses attached to the water column or boiler by means of valved fittings not less than one-half inch [12.70 millimeter] pipe size, with the lower fitting provided with a drain valve of the straight type with opening not les…

1. If a steam boiler may be closed off from the heating system by closing a steam stop valve, there must be a check valve in the condensate return line between the boiler and the system. 2. If any part of a steam heating system may be closed off from the remainder of the system b…

1. Feedwater connections must be independent of any water gauge connections and be made to the condensate return pipe or reservoir of the condensate return tank. 2. Alternatively, makeup water or water treatment may be introduced through an independent connection. The water flow …

1. Each hot water boiler must have a pressure or altitude gauge connected to it or to its flow connection in such a manner that it cannot be shut off from the boiler except by a cock with tee or lever handle placed on the pipe near the gauge. The handle of the cock must be parall…

Each hot water boiler must have a thermometer located and connected so that it is easily readable when observing the water pressure or altitude. The thermometer must be located so that it will at all times indicate the temperature in degrees Fahrenheit [Celsius] of the water in t…

Each automatically fired hot water boiler must be protected from over temperature by two temperature-operated controls. 1. Each individual automatically fired water boiler must have a safety limit control that will cut off the fuel supply to prevent water temperature from exceedi…

Each automatically fired steam boiler must be protected from over pressure by two pressure-operated controls. 1. Each automatically fired steam boiler must have a safety limit control that will cut off the fuel supply to prevent steam pressure from exceeding the fifteen pounds pe…

1. All hot water heating systems incorporating hot water tanks or fluid relief columns must be so installed as to prevent freezing under normal operating conditions. 2. Systems with open expansion tank. If the system is equipped with an open expansion tank, an indoor overflow fro…

Each condensate return pump where practicable must be provided with an automatic water level control set to maintain the water level within the limits of two gauge cocks. History: Effective July 1, 2020. General Authority: NDCC 23.1-16-07 Law Implemented: NDCC 23.1-16-07

Whenever repairs are made to fittings or appliances or it becomes necessary to replace them, all work must comply with all requirements for new installations. History: Effective July 1, 2020. General Authority: NDCC 23.1-16-07 Law Implemented: NDCC 23.1-16-07