<P> Proper protection such as welding goggles should be worn at all times, including to protect the eyes against glare and flying sparks . Special safety eyewear must be used--both to protect the welder and to provide a clear view through the yellow - orange flare given off by the incandescing flux . In the 1940s cobalt melters' glasses were borrowed from steel foundries and were still available until the 1980s . However, the lack of protection from impact, ultra-violet, infrared and blue light caused severe eyestrain and eye damage . Didymium eyewear, developed for glassblowers in the 1960s, was also borrowed--until many complained of eye problems from excessive infrared, blue light, and insufficient shading . Today very good eye protection can be found designed especially for gas - welding aluminum that cuts the sodium orange flare completely and provides the necessary protection from ultraviolet, infrared, blue light and impact, according to ANSI Z87 - 1989 safety standards for a Special Purpose Lens . </P> <P> Fuel gases that are denser than air (Propane, Propylene, MAPP, Butane, etc ...), may collect in low areas if allowed to escape . To avoid an ignition hazard, special care should be taken when using these gases over areas such as basements, sinks, storm drains, etc . In addition, leaking fittings may catch fire during use and pose a risk to personnel as well as property . </P> <P> When using fuel and oxygen tanks they should be fastened securely upright to a wall or a post or a portable cart . An oxygen tank is especially dangerous for the reason that the oxygen is at a pressure of 21 MPa (3000 lbf / in2 = 200 atmospheres) when full, and if the tank falls over and its valve strikes something and is knocked off, the tank will effectively become an extremely deadly flying missile propelled by the compressed oxygen, capable of even breaking through a brick wall . For this reason, never move an oxygen tank around without its valve cap screwed in place . </P> <P> On an oxyacetylene torch system there will be three types of valves, the tank valve, the regulator valve, and the torch valve . There will be a set of these three valves for each gas . The gas in the tanks or cylinders is at high pressure . Oxygen cylinders are generally filled to approximately 2200 psi . The regulator converts the high pressure gas to a low pressure stream suitable for welding . Acetylene cylinders must be maintained in an upright position to prevent the internal acetone and acetylene from separating in the filler material . </P>

What type of fuel gas regulator is used for a cutting station