Hypertherm HPR800XD Auto Gas Rev.2 - Manual (Page 103)

InstallatIon
HPR800XD Auto Gas – 806500 3-63
Supply gas plumbing
Rigid copper plumbing or suitable flexible hose may be used for all gas supplies. Do not use steel or aluminum pipe.
After installation, pressurize the entire system and check for leaks.
Recommended hose diameters are 9.5 mm (3/8 in) for lengths < 23 m (75 ft) and 12.5 mm (1/2 in) for
lengths > 23 m (75 ft).
For flexible-hose systems, use a hose designed for inert gas to carry air, nitrogen or argon-hydrogen. See the last page
of this section for hose part numbers.
Note: When cutting with oxygen as the plasma gas, air must also be connected to the selection console to
achieve the proper mixtures in the preflow and cutflow modes.
caution: when connecting the selection console to the supply gases, make sure that
all hoses, hose connections and fittings are acceptable for use with oxygen
and argon-hydrogen. Installation must be made in accordance with national
and local codes.
wARNINg
cUttINg wItH oXygEN cAN cAUSE FIRE oR EXPloSIoN
c utting with oxygen as the plasma gas can cause a potential fire hazard due to the oxygen-enriched
atmosphere that it creates. As a precaution, Hypertherm recommends that an exhaust ventilation
system be installed when cutting with oxygen.
Flashback arrestors are required (unless not available for specific gases or required pressures)
to prevent fire from propagating back to supply gas.
caution: Never use PtFE tape on any joint preparation.