Hypertherm HyIntensity Fiber Laser Rev.3 - Manual (Page 21)

safety
H ypertherm Fiber Laser Instruction Manual – 807090 Revision 3 S-11
Oxygen gas distribution for laser cutting
Oxygen distribution system including connections and valves shall be approved by the regulatory authority having
jurisdiction.
• Each outlet on the service piping from which oxygen is withdrawn to supply a portable outlet header shall be
equipped with a readily accessible shutoff valve.
• Each service outlet on portable outlet headers shall be provided with a check valve, a readily accessible shutoff
valve, and a detachable outlet seal cap that is chained or otherwise attached to the body of the valve.
• Master shutoff valves for oxygen shall be provided at the entry end of the portable outlet header.
• Portable outlet headers for fuel gas service shall be provided with an approved hydraulic backpressure valve
installed at the inlet and preceding the service outlets, unless an approved pressure-reducing regulator, an
approved backflow check valve, or an approved hydraulic backpressure valve is installed at each outlet. Outlets
provided on headers for oxygen service may be fitted for use with pressure-reducing regulators or for direct
hose connection.
• Hose for oxygen-fuel gas service shall meet the requirements of RMA IP-7 and CGA E-1.
• Cylinder manifolds, shutoff valves, pressure-reducing regulators, backpressure valves, hoses and connections
shall be installed under the supervision of someone properly trained in their assembly and use.
In North America, hose diameters of 19 mm (3/4 in) or smaller are color-coded green for oxygen and red for fuel
gases (acetylene, liquefied petroleum gases (LPG), natural gas, hydrogen, etc.). Black hose is used for inert gases,
compressed air, and water services.
Note: ISO standard colors are blue for oxygen hose and orange for LPG hose.
Public exhibitions and demonstrations
Safety precautions specific to welding and cutting performed at public demonstrations and exhibits shall protect
viewers, demonstrators, and the public. Installation and operation of welding, cutting, and related equipment shall
be under the supervision of a competent person designated to ensure the safety of the public. The site shall be
so constructed, equipped, and operated as to minimize the possibility of injury to viewers at the site. Materials and
equipment on-site shall be located so as not to interfere with evacuation of people during an emergency. Sites shall be
provided with an appropriate type of portable fire extinguisher. Combustible materials at the site shall be shielded from
flames, sparks, and molten metal or moved to a safe distance, i.e., 15 m (50 ft). The fire department shall be notified in
advance of the public exhibition and demonstration. The public shall be shielded from flames, flying sparks, molten metal,
harmful laser radiation, inhalation of hazardous concentrations of fumes and gases and contact with live electrical arts.
Large area viewing
For large area viewing, such as training, demonstrations, shows, and certain automatic laser welding and cutting
operations, a large filter window or curtain may be used rather than individual helmets, hand shields, or goggles. It is
important to specifically check both the wavelength and optical density for a large filter window or curtain. A combination
of windows or curtains and laser safety eye wear (LSE) may be used.