The emergency control station shall receive signals from emergency equipment and alarm and detection systems. Such emergency equipment and alarm and detection systems shall include, but not be limited to, the following where such equipment or systems are required to be provided either in this chapter or elsewhere in this code:
- Automatic sprinkler system alarm and monitoring systems.
- Manual fire alarm systems.
- Emergency alarm systems.
- Continuous gas detection systems.
- Smoke detection systems.
- Emergency power system.
- Automatic detection and alarm systems for pyrophoric liquids and Class 3 water-reactive liquids required by Section 2705.2.3.4.
- Exhaust ventilation flow alarm devices for pyrophoric liquids and Class 3 water-reactive liquids cabinet exhaust ventilation systems required by Section 2705.2.3.4.
Electrical equipment and devices within 5 feet (1524 mm) of workstations in which flammable or pyrophoric gases or flammable liquids are used shall comply with NFPA 70 for Class I, Division 2 hazardous locations. Workstations shall not be energized without adequate exhaust ventilation in accordance with Section 2703.14.
Exception: Class I, Division 2 hazardous electrical equipment is not required when the air removal from the workstation or dilution will prevent the accumulation of flammable vapors and fumes on a continuous basis.
A sprinkler head shall be installed within each branch exhaust connection or individual plenums of workstations of combustible construction. The sprinkler head in the exhaust connection or plenum shall be located not more than 2 feet (610 mm) from the point of the duct connection or the connection to the plenum. When necessary to prevent corrosion, the sprinkler head and connecting piping in the duct shall be coated with approved or listed corrosion-resistant materials. The sprinkler head shall be accessible for periodic inspection.
- Approved alternative automatic fire-extinguishing systems are allowed. Activation of such systems shall deactivate the related processing equipment.
- Process equipment which operates at temperatures exceeding 932°F (500°C) and is provided with automatic shutdown capabilities for hazardous materials.
- Exhaust ducts 10 inches (254 mm) or less in diameter from flammable gas storage cabinets that are part of a workstation.
- Ducts listed or approved for use without internal automatic sprinkler protection.
- An automatic gaseous fire-extinguishing local surface application system shall be allowed as an alternative to sprinklers. Gaseous-extinguishing systems shall be actuated by infrared (IR) or ultraviolet/infrared (UV/IR) optical detectors.
- Tools constructed of materials that are listed as Class 1 or Class 2 in accordance with UL 2360 or approved for use without internal fire-extinguishing system protection.
- When the largest cross-sectional diameter is equal to or greater than 10 inches (254 mm).
- The ducts are within the building.
- The ducts are conveying flammable gases, vapors or fumes.
When gases are transported in piping placed within the space defined by the walls of a corridor and the floor or roof above the corridor, a continuous gas detection system shall be provided where piping is located and in the corridor.
Exception: A continuous gas detection system is not required for occasional transverse crossings of the corridors by supply piping which is enclosed in a ferrous pipe or tube for the width of the corridor.
The continuous gas detection system shall be capable of monitoring the room, area or equipment in which the gas is located at or below all the following gas concentrations:
- Immediately dangerous to life and health (IDLH) values when the monitoring point is within an exhausted enclosure, ventilated enclosure or gas cabinet.
- Permissible exposure limit (PEL) levels when the monitoring point is in an area outside an exhausted enclosure, ventilated enclosure or gas cabinet.
- For flammable gases, the monitoring detection threshold level shall be vapor concentrations in excess of 25 percent of the lower flammable limit (LFL) when the monitoring is within or outside an exhausted enclosure, ventilated enclosure or gas cabinet.
- Except as noted in this section, monitoring for highly toxic and toxic gases shall also comply with Chapter 60.
The gas detection system shall automatically close the shutoff valve at the source on gas supply piping and tubing related to the system being monitored for which gas is detected when a short-term hazard condition is detected. Automatic closure of shutoff valves shall comply with the following:
- Where the gas-detection sampling point initiating the gas detection system alarm is within a gas cabinet or exhausted enclosure, the shutoff valve in the gas cabinet or exhausted enclosure for the specific gas detected shall automatically close.
- Where the gas-detection sampling point initiating the gas detection system alarm is within a room and compressed gas containers are not in gas cabinets or exhausted enclosure, the shutoff valves on all gas lines for the specific gas detected shall automatically close.
- Where the gas-detection sampling point initiating the gas detection system alarm is within a piping distribution manifold enclosure, the shutoff valve supplying the manifold for the compressed gas container of the specific gas detected shall automatically close.
Exception: Where the gas-detection sampling point initiating the gas detection system alarm is at the use location or within a gas valve enclosure of a branch line downstream of a piping distribution manifold, the shutoff valve for the branch line located in the piping distribution manifold enclosure shall automatically close.
- Fabrication areas: Exhaust ventilation for fabrication areas shall comply with the International Building Code. The fire code official is authorized to require additional manual control switches.
- Workstations: A ventilation system shall be provided to capture and exhaust gases, fumes and vapors at workstations.
- Liquid storage rooms: Exhaust ventilation for liquid storage rooms shall comply with Section 5004.3.1 and the International Building Code.
- HPM rooms: Exhaust ventilation for HPM rooms shall comply with Section 5004.3.1 and the International Building Code.
- Gas cabinets: Exhaust ventilation for gas cabinets shall comply with Section 5003.8.6.2. The gas cabinet ventilation system is allowed to connect to a workstation ventilation system. Exhaust ventilation for gas cabinets containing highly toxic or toxic gases shall also comply with Chapter 60.
- Exhausted enclosures: Exhaust ventilation for exhausted enclosures shall comply with Section 5003.8.5.2. Exhaust ventilation for exhausted enclosures containing highly toxic or toxic gases shall also comply with Chapter 60.
- Gas rooms: Exhaust ventilation for gas rooms shall comply with Section 5003.8.4.2. Exhaust ventilation for gas rooms containing highly toxic or toxic gases shall also comply with Chapter 60.
- Cabinets containing pyrophoric liquids or Class 3 water-reactive liquids: Exhaust ventilation for cabinets in fabrication areas containing pyrophoric liquids or Class 3 water-reactive liquids shall be as required in Section 2705.2.3.4.
Emergency power shall be provided for electrically operated equipment and connected control circuits for the following systems:
- HPM exhaust ventilation systems.
- HPM gas cabinet ventilation systems.
- HPM exhausted enclosure ventilation systems.
- HPM gas room ventilation systems.
- HPM gas detection systems.
- Emergency alarm systems.
- Manual fire alarm systems.
- Automatic sprinkler system monitoring and alarm systems.
- Automatic alarm and detection systems for pyrophoric liquids and Class 3 water-reactive liquids required in Section 2705.2.3.4.
- Flow alarm switches for pyrophoric liquids and Class 3 water-reactive liquids cabinet exhaust ventilation systems required in Section 2705.2.3.4.
- Electrically operated systems required elsewhere in this code or in the International Building Code applicable to the use, storage or handling of HPM.
- Flammable and combustible liquid storage cabinets shall comply with Section 5704.3.2.
- Hazardous materials storage cabinets shall comply with Section 5003.8.7.
- Gas cabinets shall comply with Section 5003.8.6. Gas cabinets for highly toxic or toxic gases shall also comply with Section 6004.1.2.
- Exhausted enclosures shall comply with Section 5003.8.5. Exhausted enclosures for highly toxic or toxic gases shall also comply with Section 6004.1.3.
- Workstations shall comply with Section 2705.2.3.
|HAZARD CATEGORY||SOLIDS |
(cubic feet @ NTP/square foot)
|Combustible dust||Note b||Not Applicable||Not Applicable|
|Combustible fiber||Not Applicable||Not Applicable|
|Baled||Notes b, c|
|Combustible liquid||Not Applicable||Not Applicable|
|Class IIIB||Not Limited|
|Combination Class I, II and IIIA||0.04|
|Cryogenic gas||Not Applicable||Not Applicable|
|Explosives||Note b||Note b||Note b|
|Flammable gas||Not Applicable||Not Applicable|
|Flammable liquid||Not Applicable||Not Applicable|
|Combination Class IA, IB and IC||0.025|
|Combination Class I, II and IIIA||0.04|
|Flammable solid||0.001||Not Applicable||Not Applicable|
|Organic peroxide||Not Applicable||Not Applicable|
|Unclassified detonable||Note b|
|Class I||Note b|
|Class IV||Not Limited|
|Class V||Not Limited|
|Oxidizing gas||Not Applicable||Not Applicable|
|Combination of Gaseous and Liquefied||1.25|
|Class 4||Note b|
|Class 3||0.003||Note b|
|Combination oxidizer Class 1, 2, 3||0.003||0.03|
|Pyrophoric||0.01||0.00125||Notes d and e|
|Class 4||Note b||Note b||Note b|
|Class 3||0.025||0.0025||Note b|
|Class 2||0.1||0.01||Note b|
|Class 1||Not Limited||Not Limited||Not Limited|
|Water reactive||Not Applicable|
|Class 3||Note b||0.00125|
|Class 1||Not Limited||Not Limited|
|Corrosives||Not Limited||Not Limited||Not Limited|
|Highly toxics||Not Limited||Not Limited||Note d|
|Toxics||Not Limited||Not Limited||Note d|
For SI: 1 pound per square foot = 4.882 kg/m2, 1 gallon per square foot = 40.7 L/m2, 1 cubic foot @ NTP/square foot = 0.305 m3 @ NTP/m2, 1 cubic foot = 0.02832 m3.
- Hazardous materials within piping shall not be included in the calculated quantities.
- Quantity of hazardous materials in a single fabrication area shall not exceed the maximum allowable quantities per control area in Tables 5003.1.1(1) and 5003.1.1(2).
- Densely packed baled cotton that complies with the packing requirements of ISO 8115 shall not be included in this material class.
- The aggregate quantity of flammable, pyrophoric, toxic and highly toxic gases shall not exceed 9,000 cubic feet at NTP.
- The aggregate quantity of pyrophoric gases in the building shall not exceed the amounts set forth in Table 5003.8.2.
The aggregate quantities of hazardous materials in a single fabrication area shall comply with Section 2704.2.2, and Table 2704.2.2.1. The quantity of HPM in use at a workstation shall not exceed the quantities listed in Table 2705.2.2.
|HPM CLASSIFICATION||STATE||MAXIMUM QUANTITY|
|Flammable, highly toxic,||Gas||Combined aggregate volume of|
|Flammable||Liquid||15 gallonsa, b|
|Solid||5 poundsa, b|
|Corrosive||Gas||Combined aggregate volume of|
|Liquid||Use-open system: 25 gallonsb|
|Solid||20 poundsa, b|
|Highly toxic||Liquid||15 gallonsa|
|Oxidizer||Gas||Combined aggregate volume of|
|Liquid||Use-open system: 12 gallonsb|
|Solid||20 poundsa, b|
|Pyrophoric||Liquid||0.5 gallonc, f|
|Solid||4.4 poundsc, f|
|Toxic||Liquid||Use-open system: 15 gallonsb|
|Solid||5 poundsa, b|
|Unstable reactive Class 3||Liquid||0.5 gallona, b|
|Solid||5 poundsa, b|
|Water-reactive Class 3||Liquid||0.5 gallonc, f|
|Solid||See Table 2704.2.2.1|
For SI: 1 pound = 0.454 kg, 1 gallon = 3.785 L.
- Maximum allowable quantities shall be increased 100 percent for closed system operations. When Note b also applies, the increase for both notes shall be allowed.
- Quantities shall be allowed to be increased 100 percent when workstations are internally protected with an approved automatic fire-extinguishing or suppression system complying with Chapter 9. When Note b also applies, the increase for both notes shall be allowed. When Note e also applies, the maximum increase allowed for both Notes b and e shall not exceed 100 percent.
- Allowed only in workstations that are internally protected with an approved automatic fire-extinguishing or fire protection system complying with Chapter 9 and compatible with the reactivity of materials in use at the workstation.
- The quantity limits apply only to materials classified as HPM.
- Quantities shall be allowed to be increased 100 percent for nonflammable, noncombustible corrosive liquids when the materials of construction for workstations are listed or approved for use without internal fireextinguishing or suppression system protection. When Note b also applies, the maximum increase allowed for both Notes b and e shall not exceed 100 percent.
- A maximum quantity of 5.3 gallons of liquids and 44 pounds of total liquids and solids shall be allowed at a workstation when conditions are in accordance with Section 2705.2.3.5.
- HPM: Vessels containing HPM shall be protected from physical damage and shall not project from the workstation.
- Hazardous cryogenic fluids, gases and liquids: Hazardous cryogenic fluid, gas and liquid vessels located within a workstation shall be protected from seismic forces in an approved manner in accordance with the International Building Code.
- Compressed gases: Protection for compressed gas vessels shall also comply with Section 5303.5.
- Cryogenic fluids: Protection for cryogenic fluid vessels shall also comply with Section 5503.5.
- Drainage piping systems connected to a compatible system for disposition of such liquids;
- The work surface provided with a slope or other means for directing spilled materials to the containment or drainage system; and
- An approved means of containing or directing spilled or leaked liquids to the drainage system.
Pyrophoric liquids and Class 3 water-reactive liquids in containers greater than 0.5-gallon (2 L) but not exceeding 5.3-gallon (20 L) capacity and pyrophoric solids in containers greater than 4.4 pounds (2 kg) but not exceeding 44 pounds (20 kg) shall be allowed at workstations when located inside cabinets and the following conditions are met:
- Maximum amount per cabinet: The maximum amount per cabinet shall be limited to 5.3 gallons (20 L) of liquids and 44 pounds (20 kg) of total liquids and solids.
- 2.1. Cabinets shall be constructed of not less than 0.097-inch (2.5 mm) (12 gage) steel.
- 2.2. Cabinets shall be permitted to have self-closing limited access ports or noncombustible windows that provide access to equipment controls.
- 2.3. Cabinets shall be provided with self- or manual-closing doors. Manual-closing doors shall be equipped with a door switch that will initiate local audible and visual alarms when the door is in the open position.
- 3.1. The system shall be designed to operate at a negative pressure in relation to the surrounding area.
- 3.2. The system shall be equipped with monitoring equipment to ensure that required exhaust flow or static pressure is provided.
- 3.3. Low-flow or static pressure conditions shall send an alarm to the on-site emergency control station. The alarm shall be both visual and audible.
- Cabinet spill containment: Spill containment shall be provided in each cabinet, with the spill containment capable of holding the contents of the aggregate amount of liquids in containers in each cabinet.
- Valves: Valves in supply piping between the product containers in the cabinet and the workstation served by the containers shall fail in the closed position upon power failure, loss of exhaust ventilation and upon actuation of the fire control system.
- 6.1. Automatic detection system: UV/IR, high-sensitivity smoke detection (HSSD) or other approved detection systems shall be provided inside each cabinet.
- 6.2. Automatic shutoff: Activation of the detection system shall automatically close the shutoff valves at the source on the liquid supply.
- 6.3. Alarms and signals: Activation of the detection system shall initiate a local alarm within the fabrication area and transmit a signal to the emergency control station. The alarms and signals shall be both visual and audible.