reglab/statecodes huggingface dataset:
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Safety Requirements › Section 455C.212 - Doors, latches and fastenings

Current through June 11, 2024
1. A watertube
				boiler must have firing doors which open inward, unless the doors are provided
				with substantial and effective latching or fastening devices or are so
				constructed as to prevent them from being blown open by pressure on the furnace
				side.
2. Latches or fastenings must
				be of the positive self-locking type. Friction contacts, latches or bolts
				actuated by springs must not be used. The requirements for latches or
				fastenings do not apply to coal openings of down-draft or similar
				furnaces.
3. All other doors except
				explosion doors not used in the firing of the boiler may be provided with bolts
				or fastenings in lieu of self-locking latching devices. Explosion doors, if
				used and if located in the setting walls within 7 feet of the firing floor or
				operating platform, must be provided with substantial deflectors to divert the
				blast.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Safety Requirements › Section 455C.214 - Backflow prevention devices

Current through June 11, 2024
Except as otherwise provided in this section, the pipe that
				  is used to feed water into a boiler or pressure vessel must not be installed or
				  connected to any domestic water supply unless a backflow prevention device that
				  is certified by the manufacturer as being approved pursuant to the code is
				  installed to prevent contamination or pollution of the water supply. A backflow
				  prevention device is not required to be installed on a hot water supply boiler
				  that is used only for domestic water use. The certification for the backflow
				  prevention device must be available to the inspector or special inspector, upon
				  request, at the time of installation and annually thereafter.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Safety Requirements › Section 455C.216 - Repairs and alterations

Current through June 11, 2024
1. Repairs and
				alterations to all boilers and pressure vessels must conform to the applicable
				provisions of the code.
2. If a
				repair or alteration to a boiler or pressure vessel is necessary, an inspector
				or special inspector who holds an "R" endorsement issued by the National Board
				must be consulted about the appropriate method of making the repair or
				alteration. After the repair or alteration is made, the inspector or special
				inspector shall inspect the boiler or pressure vessel in the manner set forth
				in the code. The person who makes the repairs or alterations shall submit the
				"R" form, prescribed by the National Board, to the Mechanical Compliance
				Section within 30 days after completion of the repair or alteration.
3. The person who makes repairs or
				alterations must be qualified pursuant to the applicable provisions of the
				code.
Added to NAC by Div. of
				  Industrial Relations by R101-02, eff. 12-15-2004; A by
				  R045-20A,
				  eff. 10/26/2020; A
				  by
				  R034-21A,
				  eff. 7/26/2023
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Safety Requirements › Section 455C.218 - Repair of safety valves

Current through June 11, 2024
A person who is in the business of repairing safety valves
				  must hold a certificate of authorization from the National Board for the use of
				  a National Board Pressure Relief Valve Repair stamp, designated by the National
				  Board as a "VR" stamp.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Safety Requirements › Section 455C.220 - Lap-seam crack

Current through June 11, 2024
1. The shell or
				drum of a boiler or pressure vessel with a lap-seam crack along a longitudinal
				riveted joint must be immediately discontinued from use. The crack may not be
				repaired.
2. As used in this
				section, "lap-seam crack" means a crack found in lap seams, extending parallel
				to the longitudinal joint and located between or adjacent to rivet
				holes.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Safety Requirements › Section 455C.222 - Automatically controlled boilers; repair or replacement of fittings or appliances

Current through June 11, 2024
1. Each
				automatically controlled boiler must be provided with a control for water level
				that automatically maintains the water level in the boiler within the range
				designated by the applicable provisions of the code.
2. Whenever repairs are made to fittings or
				appliances or it becomes necessary to replace them, the replacement or repairs
				must comply with the applicable provisions of the code.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Safety Requirements › Section 455C.224 - Repair or replacement of fitting or appliance

Current through June 11, 2024
The replacement or repair of a fitting or appliance must be
				  made in compliance with the requirements for the initial installation of a
				  fitting or appliance.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Safety Requirements › Section 455C.226 - Capacity ratings of certain valves

Current through June 11, 2024
The capacity rating of:
1. A safety valve that is designed primarily
				for use in steam or vapor service must be rated in pounds per hour.
2. A relief valve that is designed primarily
				for use in liquid service must be rated in British thermal units per
				hour.
3. A safety relief valve that
				is designed primarily for use in:
(a) Steam or
				vapor service must be rated in pounds per hour.
(b) Heated liquid service must be rated in
				British thermal units per hour.
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Safety Requirements › Section 455C.230 - Steam heating boilers: Safety valves

Current through June 11, 2024
1. Each
				low-pressure steam boiler must have one or more safety valves certified by the
				American Society of Mechanical Engineers or the National Board which is of the
				spring-pop type, adjusted and sealed to discharge at a pressure not to exceed
				15 PSIG. Seals must be attached in a manner to prevent the valve from being
				taken apart without breaking the seal. The safety valves must be arranged so
				that they cannot be reset to relieve at a higher pressure than the maximum
				allowable working pressure of the low-pressure steam boiler. A body drain that
				is below seat level must be provided by the manufacturer for all safety valves
				and safety relief valves and must not be plugged during or after field
				installation. For safety valves exceeding a 2 1/2-inch pipe size, the drain
				hole must be tapped not less than 3/8-inch pipe size. For safety valves which
				are equal to or less than 2 1/2-inch pipe size, the drain hole may not be less
				than one-quarter of an inch in diameter.
2. A safety valve for a low-pressure steam
				boiler must not be smaller than three-quarters of an inch. The safety valve
				must not be larger than 4 1/2 inches. The inlet opening must have an inside
				diameter equal to or greater than the seat diameter.
3. The minimum relieving capacity of the
				valve must be determined by the marking of the capacity on the
				boiler.
4. The minimum valve
				capacity in pounds per hour must be the greater figure determined:
(a) By dividing the maximum output in British
				thermal units at the boiler nozzle obtained by the firing of any fuel for which
				the unit is installed by 1,000; or
(b) On the basis of the pounds of steam
				generated per hour per square foot of heating surface as set forth in the
				following table:
Minimum Pounds of Steam Per Hour Per
							 Square Foot of Heating Surface
Boiler Heating Surface:
Firetube Boilers
Watertube Boilers
Hand
							 fired.........................................................................................
.................... 5
6
Stoker
							 fired........................................................................................
.................... 7
8
Oil, gas or pulverized fuel
							 fired.........................................................
.................... 8
10
Waterwall Heating Surface:
Hand
							 fired.........................................................................................
.................... 8
8
Stoker
							 fired........................................................................................
.................. 10
12
Oil, gas or pulverized fuel
							 fired.........................................................
.................. 14
16
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Safety Requirements › Section 455C.234 - Lined potable water heaters: Relief valves

Current through June 11, 2024
1. A potable water
				heater must have at least one pressure and temperature relief valve that is:
(a) Not smaller than three-fourths of an inch
				standard pipe size; and
(b) Marked
				with the symbol V or HV to ensure compliance with the construction and rating
				requirements of the code.
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Safety Requirements › Section 455C.236 - Discharge piping

Current through June 11, 2024
The discharge of safety valves, blowoff pipes and other
				  outlets of a boiler or pressure vessel must be full sized to the point of
				  discharge and be piped to a safe point of discharge.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.240 - Period of operation for nonstandard boiler

Current through June 11, 2024
1. A boiler
				having a longitudinal joint that is other than lap-riveted may be continued in
				operation beyond 30 years at the working pressure determined by the formula set
				forth in NAC
				455C.242 if it is thoroughly
				inspected, by an internal inspection and an external inspection, and is given a
				hydrostatic pressure test of 1 1/2 times the maximum allowable working pressure
				and held for at least 30 minutes, during which no distress or leakage
				develops.
2. The maximum age at
				which any nonstandard boiler having longitudinal joints that are lap-riveted
				and operating at a pressure in excess of 50 PSIG may be operated is 20 years.
				If such a boiler is removed from its existing setting, it may not be
				reinstalled for a pressure that is in excess of 15 PSIG.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.244 - Working pressure for boiler made of cast iron

Current through June 11, 2024
The maximum allowable working pressure for any boiler made of
				  cast iron, except a hot water boiler, is 15 PSIG.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.246 - Working pressure for watertube boiler

Current through June 11, 2024
The maximum allowable working pressure on a watertube boiler
				  which has:
1. Tubes secured in headers
				made of cast iron or malleable iron; or
2. Mud drums made of cast iron, must not
				exceed 160 PSIG.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.248 - Maximum age

Current through June 11, 2024
The maximum age at which a standard boiler may be operated is
				  the age determined pursuant to the code in effect when the boiler was
				  constructed and stamped, if it is thoroughly inspected, by an internal
				  inspection and an external inspection, and is given a hydrostatic pressure test
				  of 1 1/2 times the maximum allowable working pressure with water that is at a
				  temperature of at least 70 degrees Fahrenheit but not more than 120 degrees
				  Fahrenheit.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.250 - Clearance: Generally

Current through June 11, 2024
Except as otherwise provided in this section and NAC
				  455C.252 and
				  455C.254, if boilers are
				  replaced or new boilers are installed in existing or new buildings, a minimum
				  height of at least 3 feet must be provided between the top of the boiler,
				  excluding appurtenances, and the ceiling and at least 3 feet between any side
				  of the boiler and any adjacent wall or other structure. Boilers which are
				  designed to be mounted on a wall are not required to maintain a distance of 3
				  feet from the wall on which they are mounted. Boilers and pressure vessels
				  having manholes must have a 5-foot clearance from the opening of the manhole to
				  any wall, ceiling or piping that will prevent a person from entering the boiler
				  or pressure vessel. All boilers and pressure vessels must be located so that
				  adequate space will be provided for the proper operation of the boilers and
				  pressure vessels and their appurtenances, for the inspection of all surfaces,
				  tubes, waterwalls, economizers, piping, valves and other equipment, and for the
				  necessary maintenance and repair and the replacement of tubes. If pressure
				  vessels are installed or replaced, there must be an area of unobstructed
				  clearance which is at least 18 inches wide and provides access for inspection,
				  maintenance and repair. Clearance for repairs and cleaning may be provided
				  through a door or access panel into another area if the door or access panel is
				  large enough to allow the repairs and cleaning to be performed
				  adequately.
Added to NAC by Div. of
				  Industrial Relations by R101-02, eff. 12-15-2004; A by
				  R034-21A,
				  eff. 7/26/2023
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.252 - Clearance: Fired storage and fired coil water heater

Current through June 11, 2024
The clearance between a wall or other structure and a fired
				  storage and fired coil water heater must be not less than the clearance
				  specified by the manufacturer.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.254 - Clearance and access: Copper watertube boilers

Current through June 11, 2024
1. A copper
				watertube boiler that is used for domestic hot water or comfort heating must
				have a clearance of not less than the clearance recommended by the manufacturer
				of the boiler between each side or end of the boiler from which maintenance,
				operation of the controls, or repairs may be required, and any wall, column,
				equipment or other structure.
2.
				Each side or end of a copper watertube boiler that is used for domestic hot
				water or comfort heating must have a clearance of not less than 6 inches or the
				clearance recommended by the manufacturer of the boiler, whichever is greater,
				between each side or end of the boiler from which maintenance, operation of the
				controls, or repairs will not be required, and any wall, column, equipment or
				other structure.
3. A copper
				watertube boiler must be installed in a manner that allows a person access to
				the boiler to maintain, repair or operate the boiler.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.256 - Feeding

Current through June 11, 2024
1. Each boiler must have a supply of feed
				water that will allow it to be fed at any time while under pressure.
2. A boiler having more than 500 square feet
				of water heating surface must have at least two means of feeding water, one of
				which must be a feed pump. A source of feed directly from water mains at a
				pressure of 6 percent greater than the set pressure of the safety valve with
				the highest setting may be used as one of the means of feeding water. Boilers
				fired by gaseous, liquid or solid fuel in suspension may be equipped with a
				single means of feeding water if means are furnished for the shutoff of heat
				before the level of water reaches the lowest safe level.
3. The feed water must be introduced into the
				boiler in such a manner that it will not be discharged close to riveted joints
				of the shell or furnace sheets, directly against the surfaces exposed to
				products of combustion or to direct radiation from the fire. The feed piping to
				the boiler must be provided with a check valve near the boiler and a stop valve
				or cock between the check valve and the boiler. If two or more boilers are fed
				from a common source, there must also be a stop valve on the branch to each
				boiler between the check valve and source of supply. If a globe valve is used
				on feed piping, the inlet must be under the disc of the valve.
4. In all cases where returns are fed back to
				the boiler by gravity, there must be a check valve and stop valve in each
				return line. The stop valve must be placed between the boiler and the check
				valve, and both must be located as close to the boiler as is
				practicable.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.258 - Feed water connections

Current through June 11, 2024
1. Feed water,
				make-up water or water treatment must be introduced into a boiler through the
				return piping system or through an independent feed water connection which does
				not discharge against the parts of the boiler exposed to direct radiant heat
				from the fire. Feed water, make-up water or water treatment must not be
				introduced through openings or connections provided for inspection or cleaning,
				a safety valve, safety relief valve, surface blowoff, water column, water gauge
				glass, pressure gauge or temperature gauge.
2. The feed water pipe must be provided with
				a check valve near the boiler and a stop valve or cock between the check valve
				and the boiler or return pipe system.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.260 - Return pipe loop connections

Current through June 11, 2024
The return water connections to all low-pressure steam
				  heating boilers supplying a gravity return heating system must be arranged to
				  form what is known as the "return pipe loop connection," so that the water
				  cannot be forced out of the boiler below the safe water level. This connection
				  is illustrated in section IV of the
ASME Boiler and Pressure Vessel
				  Code
, as adopted by reference in NAC
				  455C.108.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.262 - Steam gauges

Current through June 11, 2024
1. Each steam
				boiler must have a steam gauge connected to the steam space or to the steam
				connection to the water column. The steam gauge must have a dial range that is
				graduated to approximately double the pressure at which the safety valve is
				set, but in no case to less than 1 1/2 times this pressure. The steam gauge
				must be connected to a siphon or equivalent device of sufficient capacity to
				keep the gauge tube filled with water and arranged so that the gauge cannot be
				shut off from the boiler except by a cock placed near the gauge and provided
				with a tee or lever handle arranged to be parallel to the pipe in which it is
				located when the cock is open.
2.
				If a steam gauge connection which is longer than 8 feet is necessary, a shutoff
				valve may be used near the boiler if the valve is of the outside-screw-and-yoke
				type and is locked open. The line must be of ample size with provision for free
				blowing. Each boiler must be provided with a 1/4-inch nipple and globe valve
				connected to the steam space for the exclusive purpose of attaching a test
				gauge when the boiler is in service so that the accuracy of the boiler steam
				gauge may be determined.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.264 - Stop valves and check valves

Current through June 11, 2024
1. Each outlet for
				steam from a boiler, except connections for a safety valve and water column,
				must be fitted with a stop valve that is located as close as practicable to the
				boiler.
2. If a stop valve is so
				located that water can accumulate, ample drains must be provided. The drainage
				must be piped to a safe location and must not be discharged on the top of the
				boiler or its setting.
3. If
				boilers provided with manholes are connected to a common steam main, the
				connection for steam from each boiler must be fitted with two stop valves
				having an ample free-blow drain between them. The discharge of the drain must
				be visible to the operator while manipulating the valves and must be piped
				clear of the boiler setting. The stop valves must consist of one automatic
				nonreturn valve set next to the boiler and a second valve of the
				outside-screw-and-yoke type.
4. If
				any part of a heating system may be closed off from the remainder of the system
				by closing a steam stop valve, there must be a check valve in the condensate
				return line from that part of the system.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.266 - Water level indicators

Current through June 11, 2024
1. Outlet
				connections, except for damper regulators, feed water regulators, low-water
				fuel cutouts, drains, steam gauges or such apparatus that does not permit the
				escape of an appreciable amount of steam or water therefrom, must not be placed
				on the piping that connects the water column to the boiler. The water column
				must be provided with a valved drain of at least 3/4-inch pipe size, the drain
				to be piped to a safe location.
2.
				A boiler is not required to be installed with a gauge cock.
3. For all installations where the water
				gauge glass or glasses are more than 30 feet above the boiler operating floor,
				remote water level indicating or recording gauges must be installed at eye
				level above the operating floor.
4.
				Each steam boiler must have one or more water gauge glasses attached to the
				water column or boiler by means of valved fittings. The lower fitting must be
				provided with a drain valve of the straightway type with an opening not less
				than 1/4-inch diameter to facilitate cleaning. The replacement of the gauge
				glass must be possible while the boiler is under pressure.
5. Transparent materials other than glass may
				be used for the water gauge if the material has proved suitable for the
				pressure, temperature and corrosive conditions encountered in
				service.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.268 - Qualifications of attendant

Current through June 11, 2024
A person is qualified to attend a power boiler or a
				  high-pressure, high-temperature water boiler, where such attendance is required
				  pursuant to NAC
				  455C.274, if the person
				  has:
1. The technical training,
				experience and knowledge necessary to start, operate and shut down the boiler;
				and
2. A high school diploma or the
				equivalent and at least the following number of days or equivalent hours of
				documented experience in the operation of boilers for the size of the boiler
				being operated:
(a) For up to 299 boiler
				horsepower, 182 days.
(b) For 300
				to 499, inclusive, boiler horsepower, 365 days.
(c) For 500 to 1,000, inclusive, boiler
				horsepower, 547 days.
(d) For more
				than 1,000 boiler horsepower, 1,095 days.
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.270 - Air and ventilation

Current through June 11, 2024
1. A permanent
				source of outside air must be provided for the room in which the boiler is
				located to allow satisfactory combustion of the fuel as well as proper
				ventilation of the room under normal operating conditions. Air used for
				combustion must not be taken from a room that contains equipment for
				refrigeration.
2. The total input
				of British thermal units of the burners for all fired pressure vessels in the
				room for the boiler must be used to determine the size of the louver, whether
				the boilers are fired by coal, oil or gas in compliance with the applicable
				provisions of
Controls and Safety Devices for Automatically Fired
				Boilers
, as adopted by reference in NAC
				455C.108.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.272 - Exits

Current through June 11, 2024
Any room for a boiler exceeding 500 square feet in floor area
				  and containing one or more boilers having a capacity to burn fuel of 1,000,000
				  British thermal units per hour, or the equivalent electrical input of heat,
				  must have at least two means of exit, remotely located from one another. If
				  such a room has more than one elevation, each elevation must have two means of
				  exit, remotely located from one another.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.274 - Supervision

Current through June 11, 2024
1. Except as otherwise provided in subsection
				4, a high-pressure, high-temperature water boiler and a power boiler must be
				attended by an operator who meets the qualifications set forth in NAC
				455C.268.
2. The operator shall personally check the
				operation of the boiler, the necessary auxiliaries and the level of water in
				the boiler at intervals necessary to ensure the boiler's safe operation. The
				boiler and its auxiliaries must be checked at least once every 60 minutes and
				must not be left unattended for periods in excess of the time required to
				evaporate the water from the normal operating level to the lowest water level
				permissible if the feed water is shut off or the boiler is forced to its
				maximum capacity. A log noting the time of all checks and observations must be
				kept in the boiler room.
3. If the
				attendance of the boiler is required pursuant to this section, a clock to start
				or stop automatically the operation of the boiler must not be used, unless the
				timing mechanism is a device or system which has been approved by the
				Mechanical Compliance Section.
4.
				High-pressure, high-temperature water boilers and power boilers are not
				required to be attended, if the boiler is equipped with the following
				functioning protective devices, as required by the applicable provisions of
				Controls and Safety Devices for
Automatically Fired Boilers
,
				CSD-1, as adopted by reference in NAC
				455C.108:
(a) If the boiler is operated at less than
				supercritical pressure:
(1) A low water fuel
				cutoff;
(2) An automatic feed
				regulator;
(3) Fireside regulators
				and controls;
(4) An audible alarm
				to indicate low water;
(5) A
				pressure control; and
(6) A
				programmed flame safeguard system with an audible alarm on burners equipped
				with spark ignition.
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.276 - Hot water heating boilers: Pressure or altitude gauge

Current through June 11, 2024
1.
				Each hot water heating 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 a tee or lever handle, placed on the pipe
				near the gauge. The handle of the cock must be parallel to the pipe in which it
				is located when the cock is open.
2. The scale on the dial of the pressure or
				altitude gauge must be graduated to not less than 1 1/2 or more than 3 times
				the pressure at which the safety valve is set.
3. Piping or tubing for pressure or altitude
				gauge connections must be made of nonferrous metal if the size of the piping or
				tubing is smaller than 1 inch.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.278 - Hot water boilers: Thermometer; operating control and secondary high limit control; stop valve

Current through June 11, 2024
1. Each hot water
				boiler must have a thermometer so located and connected that it is easily
				readable when observing the burner of the boiler. The thermometer must be so
				located and connected that it will at all times indicate, in degrees
				Fahrenheit, the temperature of the water in the boiler at or near the
				outlet.
2. In addition to
				satisfying the requirements set forth in subsection 1, each hot water boiler
				must be equipped with:
(a) An operating
				control and a secondary high limit control that automatically interrupts the
				fuel supply to the boiler if the boiler reaches its designed maximum operating
				temperature; and
(b) A stop valve
				and a drain valve that have been installed in accordance with:
(1) The applicable construction code, if any;
				or
(2) Controls and Safety Devices
				for Automatically Fired Boilers, CSD-1, as adopted by reference in NAC
				455C.108.
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.280 - Device for feeding water; automatic cutoff for fuel

Current through June 11, 2024
1.
				Except as otherwise provided in subsections 4 and 5, each automatically fired
				steam, vapor system or hot water heating boiler with an input of fuel in excess
				of 199,999 British thermal units per hour must be equipped with an automatic
				cutoff for fuel if water is low that is located in such a manner as to cut off
				automatically the supply of fuel when the surface of the water falls to the
				lowest safe water line. If a device for feeding water is installed, it must be
				so constructed that the inlet valve for water cannot feed water into the boiler
				through the float chamber and so located as to supply requisite water for
				feeding. For steam boilers, the lowest safe water line must be not lower than
				the lowest visible part of the water glass.
2. A device for controlling the feeding of
				water or fuel may be attached directly to a boiler or for low-pressure steam
				and hot water boilers, to the tapped opening provided for attaching a water
				glass directly to the boiler. The water glass must be attached as close as
				possible to the boiler. The ends of the nipples must be reamed to full-size
				diameter. The connection from the boiler must be a nonferrous "T" or "Y" joint
				at least 1/2-inch pipe size between the boiler and the water glass. The
				straightway tapping of the "T" or "Y" must take the fittings for the water
				glass. The side outlet of the "T" or "Y" must take the fittings for the fuel
				cutoff or device for feeding water.
3. Designs embodying a float and float bowl
				must have a vertical drain pipe and adequate valving for the straightway valve
				at the lowest point in the water-equalizing pipe connections by which the bowl
				and the equalizing pipe can be flushed and the device tested. The straightway
				valve must be at least 3/4-inch national pipe size.
4. The cutoff for fuel, if water is low on a
				hot water heating boiler, may be located anywhere above the lowest safe
				permissible water level established by the manufacturer of the
				boiler.
5. A coil-type or a
				watertube boiler for hot water which requires forced circulation of water to
				prevent overheating of the coils or tubes must have a device to sense the flow
				of water installed in the outlet pipes in place of the cutoff for fuel if water
				is low. The device must automatically cut off the supply of fuel if the
				circulating flow of water is interrupted.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.282 - Pressure-reducing valves

Current through June 11, 2024
1. Where
				pressure-reducing valves are used, at least one relief or safety valve must be
				provided on the low-pressure side of the reducing valve if the piping or
				equipment on the low-pressure side does not meet the requirements for the full
				initial pressure. The relief or safety valve must be located downstream and as
				close as possible to the reducing valve. Proper protection must be provided to
				prevent injury or damage caused by any fluid escaping from the discharge or
				relief or safety valve if vented to the atmosphere. The combined discharged
				capacity of the relief or safety valve must be such that the pressure rating of
				the lower pressure piping or equipment is not exceeded if the reducing valve
				fails when it is in the open position.
2. Hand-controlled bypasses around reducing
				valves may be used. If a bypass is used around the reducing valve, the safety
				valve on the low-pressure side must be of sufficient capacity to relieve all
				the fluid that can pass through the bypass without overpressuring the
				low-pressure side. A pressure gauge must be installed on the low-pressure side
				of a reducing valve downstream of the safety relief valve.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.284 - Blowoff piping and fittings

Current through June 11, 2024
1. The construction
				of the setting around each blowoff pipe must allow free expansion and
				contraction. The openings for the setting must be sealed without restricting
				the movement of the blowoff piping.
2. All blowoff piping, when exposed to heat
				from a furnace, must be protected by firebrick or other heat-resisting material
				so constructed that the piping may be inspected readily. Each boiler must have
				a blowoff pipe, fitted with a valve or cock, in direct connection with the
				lowest water space. Cocks must be of the gland or guard type and suitable for
				the pressure allowed. The use of globe valves must meet the requirements
				established by the American Society of Mechanical Engineers. If the maximum
				allowable working pressure exceeds 100 PSIG:
(a) Each blowoff pipe must be provided with
				two valves or a valve and cock, and the valves and cocks must be made of
				extra-heavy steel, or bronze when listed as acceptable in table 126.1 of
Power Piping
, as adopted by reference in NAC
				455C.108, and must not be
				galvanized; and
(b) The blowoff
				piping must be at least extra-heavy steel from the boiler to each valve and
				must be run full size without reducers or bushings.
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Boilers › Section 455C.286 - Blowoff equipment

Current through June 11, 2024
1. A blowdown from
				a boiler that enters a sanitary sewer system or a blowdown which is considered
				by an inspector or special inspector to be a hazard to life or property must
				pass through blowoff equipment that will reduce pressure and
				temperature.
2. The temperature of
				the water leaving the blowoff equipment must not exceed 140 degrees
				Fahrenheit.
3. The pressure of the
				blowdown leaving any type of blowoff equipment must not exceed 5
				PSIG.
4. The blowoff piping and
				fittings between the boiler and the blowoff tank must comply with the
				applicable provisions of the code.
5. All blowoff equipment must be fitted with
				openings to facilitate cleaning and inspection.
6. Blowoff equipment must conform to the
				applicable provisions of the code.
7. A blowoff tank, when required pursuant to
				the code, must:
(a) Be constructed in
				accordance with division 1 of section VIII of the
ASME Boiler and
				Pressure Vessel Code
, as adopted by reference in NAC
				455C.108; and
(b) Have a minimum design pressure of 50
				pounds per square inch or the maximum allowable working pressure of the boiler,
				whichever is greater.
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Pressure Vessels › Section 455C.290 - Working pressure for formed heads and nonstandard pressure vessels

Current through June 11, 2024
The maximum allowable working pressure allowed for:
1. Formed heads and their tensile strength
				and factors of safety; and
2.
				Nonstandard pressure vessels subjected to external pressure, must be determined
				by the applicable provisions set forth in division 1 of section VIII of the
ASME Boiler and Pressure Vessel Code
, as adopted by reference
				in NAC 455C.108.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Pressure Vessels › Section 455C.292 - Working pressure for nonstamped pressure vessels

Current through June 11, 2024
If a pressure vessel is not stamped with a symbol of the
				  American Society of Mechanical Engineers but the pressure vessel satisfies the
				  requirements of the code, the maximum allowable working pressure of the
				  pressure vessel is the maximum allowable working pressure as determined by the
				  designer of the pressure vessel and stamped on the pressure vessel.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Pressure Vessels › Section 455C.294 - Maximum allowable working pressure and minimum factor of safety

Current through June 11, 2024
1. The maximum allowable working pressure for
				standard pressure vessels must be determined in accordance with the applicable
				provisions of the edition of the code under which they were constructed and
				stamped.
2. The maximum allowable
				working pressure on the shell of a nonstandard pressure vessel must be
				determined by the following formula:
TStE
- -
=
maximum allowable working pressure, in PSIG
RFS
where:
TS =
ultimate tensile strength of shell plate, in PSIG. If
							 the tensile strength of a carbon steel plate is not known, it shall be deemed
							 to be 55,000 PSIG for temperatures not exceeding 650 degrees Fahrenheit. For
							 all other materials, the lowest stress values for that material designated in
							 division 1 of section VIII of the
ASME Boiler and Pressure Vessel
							 Code
, as adopted by reference in NAC
							 455C.108, must be used.
t =
minimum thickness of shell plate of weakest course, in
							 inches.
E =
efficiency of longitudinal joint, depending upon
							 construction. The following values must be used:
For riveted joints, calculated riveted
							 efficiency.
For fusion-welded and brazed joints:
Single lap weld 40 percent
Double lap weld 50 percent
Single butt weld 60 percent
Double butt weld 70 percent
Forge weld 70 percent
Brazed steel 80 percent
R =
inside radius of weakest course of shell, in inches,
							 if the thickness does not exceed 10 percent of the radius. If the thickness is
							 more than 10 percent of the radius, the outer radius must be used.
FS =
factor of safety.
3.
				The maximum allowable working pressure for nonstandard pressure vessels
				subjected to external pressure will be determined by the applicable provisions
				in division 1 of section VIII of the
ASME Boiler and Pressure Vessel
				Code
, as adopted by reference in NAC
				455C.108.
4. The minimum factor of safety may not be
				less than the factor set forth in the edition of the code that was applicable
				at the time of construction. The maximum allowable working pressure may be
				decreased if deemed necessary by the inspector or special inspector to ensure
				the operation of the vessel within safe limits. The inspector or special
				inspector shall consider the condition of the vessel and the particular service
				to which it is subjected.
5. The
				maximum allowable working pressure permitted for formed heads under pressure
				will be determined by using the appropriate formulas set forth in:
(a) Division 1 of section VIII of the
ASME Boiler and Pressure Vessel Code
, as adopted by reference
				in NAC 455C.108; and
(b) Subsections 3 and 4.
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Pressure Vessels › Section 455C.296 - Safety and relief valves and indicating and controlling devices

Current through June 11, 2024
Each pressure vessel must be protected by safety or relief
				  valves and indicating and controlling devices which will ensure its safe
				  operation. These valves and devices must be so constructed, located and
				  installed that they cannot readily be rendered inoperative. The relieving
				  capacity of safety valves must be sufficient to prevent a rise of pressure in
				  the vessel of more than 10 percent above the highest pressure to which any
				  device to relieve pressure is set but in no case more than 6 percent above the
				  maximum allowable working pressure. The opening pressure of the device to
				  relieve pressure must not be greater than the maximum allowable working
				  pressure of the vessel.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Pressure Vessels › Section 455C.298 - Hydrostatic tests for pressure; use of other testing media

Current through June 11, 2024
1.
				A hydrostatic pressure test, when applied to pressure vessels, must not exceed
				1 1/2 times the maximum allowable working pressure. The pressure must be under
				proper control so that the required test pressure will not be exceeded by more
				than 2 percent.
2. During a
				hydrostatic test, the safety valve must be removed or each valve disc must be
				held to its seat by means of a testing clamp or plugging device and not by
				screwing down the compression screw upon the spring.
3. The temperature of the water used to apply
				a hydrostatic test must be not less than 70 degrees Fahrenheit or more than 120
				degrees Fahrenheit.
4. When a
				hydrostatic test is applied, the pressure must be equal to:
(a) The normal operating pressure of the
				pressure vessel but need not exceed the release pressure of the safety valve
				having the lowest release setting if tightness is in question.
(b) One and one-half times the maximum
				allowable working pressure if safety is in question.
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › BOILERS AND PRESSURE VESSELS › Miscellaneous Provisions › Section 455C.300 - Contractor's license required for certain activities; exemption from requirement

Current through June 11, 2024
1. Except as
				otherwise provided in subsections 2 and 3, a person shall not undertake to, or
				offer to undertake to, install, construct, add to, subtract from, improve or
				move any boiler or pressure vessel unless the person holds a contractor's
				license issued pursuant to chapter 624 of NRS which authorizes him or her to
				install boilers or pressure vessels.
2. A person who performs an act described in
				subsection 1 as the employee of another is not required to hold a contractor's
				license that meets the requirements of subsection 1 if:
(a) The person's only compensation for the
				act is wages paid by his or her employer; and
(b) The person's employer holds a license
				that meets the requirements of subsection 1.
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › ELEVATORS › General Provisions › Section 455C.400 - Definitions

Current through June 11, 2024
As used in NAC 455C.400 to
				  455C.530, inclusive, and section
				  1 of this regulation, unless the context otherwise requires, the words and
				  terms defined in NAC
				  455C.402 to
				  455C.444, inclusive, have the
				  meanings ascribed to them in those sections.
Added to NAC by Div. of
				  Industrial Relations by R101-02, eff. 12-15-2004; A by R077-14, 1-16-2015; A by
				  R045-20A,
				  eff. 10/26/2020
NRS
				  455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › ELEVATORS › General Provisions › Section 455C.402 - "Alteration" defined

Current through June 11, 2024
"Alteration" means any change, other than maintenance, repair
				  or replacement to the equipment of an elevator, including its parts, components
				  and subsystems.
Added to NAC by Div. of Industrial Relations by R101-02,
					 eff. 12-15-2004
NRS 455C.110
Nevada Administrative Code › Chapter 455C - Boilers, Elevators and Pressure Vessels › ELEVATORS › General Provisions › Section 455C.403 - "Authorized inspection agency" defined

Current through June 11, 2024
"Authorized inspection agency" means a person who holds a
				  certificate of accreditation as an authorized inspection agency issued by the
				  Mechanical Compliance Section pursuant to NAC 455C.480.
Added to NAC by Div. of Industrial Relations by R077-14,
					 eff. 1-16-2015
NRS 455C.110