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Technical data
B722-20-880 Issue D
2.4 Purge gas specification (EXT255H 24 V and EXT255Hi 24 V only)
2.5 Cooling-water
The following cooling-water specification corresponds to a typical high-quality drinking water specification. Check
with your water supply authority if you are in doubt about the quality of your supply.
2.6 Materials exposed to gases pumped
The following materials and component types are exposed to the gases pumped: aluminium alloys, stainless steels,
PEEK (polyether- etherketone) 450G, fluoroelastomer and nitrile ‘O’-rings, hydrocarbon lubricant, felt, rare earth
magnets, silicon nitride, phenolic resin and carbon- fibre reinforced epoxy resin.
Purge gas Dry nitrogen, argon or other inert gases
Maximum dew point at atmospheric pressure -22 °C
Maximum size of particulates 1
µm
Maximum concentration of oil 0.1 parts per million
Allowable purge gas flow (when required) 20 to 100 sccm (0.33 to 1.67 mbar l s
-1
, 33 to
167 Pa l s
-1
)
Recommended purge gas flow 25 sccm (0.42 mbar l s
-1
, 42 Pa l s
-1
)
Maximum allowable purge gas supply pressure 2 bar (gauge); 29 psi, 3 x 10
5
Pa
Quality Mechanically clean and optically clear with no
deposits or turbidity.
pH value 6.0 to 8.0
Maximum calcium carbonate concentration 75 parts per million
Maximum chloride concentration 100 parts per million
Minimum oxygen concentration 4 parts per million
Minimum water-cooling flow rate (at 15 °C) 15 l h
-1
Water temperature See Ta b l e 1 and 2
Maximum water pressure 5 bar (gauge), 73.5 psig, 6 x 10
5
Pa
Materials exposed to cooling water Nickel plated brass
Table 1 - EXT 70H 24 V / EXT 70Hi 24 V technical data
Parameter
EXT70H/ISO63
24 V
EXT70H/
ISO100 24 V
EXT70H/63CF
24 V
EXT70H/NW40
24 V
Notes
Mass 2.8 kg 2.8 kg 4.7 kg 2.8 kg
Inlet-flange DN63ISO-K DN100ISO-K DN63CF DN40NW
Outlet-flange DN16NW DN16NW DN16NW DN16NW
Vent-port 1/8 inch BSP 1/8 inch BSP1/8 inch BSP1/8 inch BSP
Interstage-port DN25NW
*
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Purge-flange----
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