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SAFETY PRECAUTIONS 55-9
<br /> _ Chapter 6 Compressed Gas Cylinders 7-2 Fire Protection and Detection Systems.
<br /> r 7-2.1 Separate rooms and areas of buildings for 'use o?stor-
<br /> 6-1 Design and Construction. Cylinders shall be designed, age of toxic or pyrophoric gases shall be protected by an
<br /> fabricated, tested,and marked (stamped) in accordance with automatic fire extinguishing system in accordance with NFPA
<br /> regulations of DOT,TC, or the "Rules for the Construction 13, Standard far the Installation of Sprinkler Systems,or NFPA 15,
<br /> of Unfired Pressure Vessels," Section VIII, ASME Boiler & Standard for Water Spray Fixed Systems for Fire Protection.
<br /> Pressure Vessel Code.
<br /> 7-2.2 A fire alarm activation station or approved emergency
<br /> 6-2 Defective Cylinders. Defective cylinders shall be re- signal device shall be installed adjacent to exit doors of build=
<br /> turned to the supplier. Suppliers shall repair the cylinder, ings and outside of rooms or areas where the toxic,pyrophoric,
<br /> remove it from service,or dispose of it in an approved manner. or flammable gases are used or stored.Activation of the system
<br /> 6-3 Cylinders Containing Residual Gas. Compressed gas cyl- shall sound a local alarm.
<br /> inders having residual product shall be treated as full except 7-2.3 Smoke Detection. An approved,supervised smoke de-
<br /> when being examined,serviced,or refilled by a gas manufac- tection system shall be provided in rooms or areas where
<br /> Curer or distributor. flammable, pyrophoric, and toxic gases are stored indoors.
<br /> C6-4 Valve Protective Caps. Where compressed gas cylinders Activation of the detection system shall sound a local alarm.
<br /> are designed to accept valve protective caps, the user shall 7-2.4 Manual alarm, emergency signal, detection, or keep such caps on compressed gas cylinders at all times except auto-
<br /> matic fire extinguishing systems shall be supervisgc( by,an
<br /> when being filled or connected for use.
<br /> approved central or remote station service qr.shall initiate
<br /> 6-5 Valve Outlet Caps or Plugs. Where gastight valve outlet an audible or visual signal at a constantly,attended,on-site
<br /> caps or plugs are provided, the user shall keep such devices location.
<br /> on the valve outlet at all times except when compressed gas
<br /> cylinders are being filled or connected for use. 7-3* Standby Power. Where mechanical ventilation,'treat-
<br /> ment systems, temperature control,manual alarm,detection,
<br /> 6-6 Securing Cylinders. Compressed or liquefied gas cylin- or other electrically operated systems are required by other
<br /> ders in use or in storage shall be secured to prevent them provisions of this standard, such systems shall be conneFted
<br /> from falling or being knocked over. to a standby source of power to automatically'suPply electrical
<br /> Exception No. 1: .Compressed gas cylinders in the process of exanzina- power in the event of loss of power from the'primary source.
<br /> tion, servicing, and refilling.
<br /> 74 Compressed Gas Cabinets. Compressed gas cabinets
<br /> Exception No. 2: At cylinder-filling plants and distributors'ware- shall be designed in accordance with this section. Cabinets
<br /> houses, the nesting of cylinders shall be permitted to secure cylinders. shall meet the following requirements.
<br /> C6-7 Cylinder Orientation. Compressed gas cylinders shall be 7-4,1 They shall be labeled on the front of the cabinet in
<br /> permitted to be stored and used in the horizontal position. red letters a minimum of 1 in. (25.4 mm) high on contrasting
<br /> 6-8 Cylinders` Exposed to Fire. Compressed gas cylinders background:
<br /> exposed to fire shall not be used until they are requalified in HAZARDOUS—KEEP FIRE AWAY
<br /> accordance with the pressure vessel code under,which they !
<br /> were glanufactured. 7-4.2 They shall be operated at negative pressure in relation
<br /> to the surrounding area.
<br /> 6-9 Exposure to Electrical Circuits. Compressed gas cylin-
<br /> ders shall not be placed where they could become a part of 74.3 They shall be provided with self-closing limited access
<br /> an electrical circuit. ports or noncombustible windows to give access to gquipment
<br /> controls. The average velocity of ventilation •at,the face of
<br /> 6-10 Temperature Limits. Compressed gas cylinders shall access ports or windows shall be not less than 200 ft/min
<br /> not be exposed to temperatures exceeding 125°F(52'C).Cyl- (60.7 m/min) with a minimum of 150 ft/min (45.7 m/min)
<br /> inders shall not be subjected to direct heating to increase at any point of the access port or window.
<br /> vapor pressure.
<br /> 17-4.4* They shall be provided with a treatment system to
<br /> Exception: When cylinders are being refilled. process all exhausted ventilation from the gas cabinet such
<br /> ( that emissions are not a hazard to life. The system shall be
<br /> Chapter 7 Safety Precautions sized to treat the total capacity•of the largest toxic gas cylinder
<br /> at the maximum flow rate based on controls in place.
<br /> 7-1 Ignition Source Control. 7-4.5 They shall be provided with self-closing doors,
<br /> 7-1.1 ' Smoking or open flames shall not be permitted within 74.6 They shall be constructed of not less than,12-g4uge;
<br /> 20 ft (61 m) of any area where flammable, oxidizing, gyro- steel,which shall be permitted to be coated to prevent corro-
<br /> phoric, or toxic compressed gasps are stored. Sion.
<br /> 17-1.2* Where ignition of a flammable gas by static electricity 74.7 They shall be internally sprinklered.
<br /> is Possible, means shall be provided to prevent a static dis-
<br /> charge. 7-5 Emergency Equipment.
<br /> 7-1.3 Electrical equipment and wiring in areas where fl'ain 17-5.1* Breathing Apparatus. .;When toxic compressed, gasps
<br /> mable gases are produced, stored, handled, or used shall be are produced, handled, stored, or used, a minimum of two
<br /> y installed in accordance with the provisions of NFPA 70, Na- self-contained breathing apparatus shall be, provided. The
<br /> l tio4al flec(ical Code®. breathing apparatus shall be suitable for use with the material
<br /> 1998 Edition
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