B777-00-880 Issue E
Page 6
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Technical Data
2.6
Materials exposed to gases pumped
The following materials and component types are exposed to the gases pumped: aluminium alloys, stainless steels,
fluoroelastomer and nitrile 'O' rings, hydrocarbon lubricant, rare earth magnets, silicon nitride, phenolic resin and
carbon fibre epoxy resin.
Table 5 - Technical data
Parameter
EXT555H
Notes
Mass EXT555H ISO160
13.4 kg
Mass EXT555H DN160CF
21.2 kg
Main inlet flange
DN160ISO-K/DN160CF
Outlet flange
DN25NW
Interstage port (Hi variants)
DN25NW
Vent port
1/8 inch BSP
Purge port
1/8 inch BSP
Inlet pumping speed
*
N
2
540 l s
-1
He
580 l s
-1
H
2
500 l s
-1
Ar
510 l s
-1
Interstage pumping speed
*
N
2
8 l s
-1
He
6 l s
-1
H
2
8 l s
-1
Ar
10 l s
-1
Inlet compression ratio
†
N
2
>10
10
Pb < 20 mbar
He
10
8
Pb < 12 mbar
H
2
10
6
Pb < 7 mbar
Ar
>10
10
Pb < 20 mbar
Critical backing pressure
‡
N
2
> 20 mbar
He
20 mbar
H
2
9 mbar
Ar
> 20 mbar
Ultimate pressure
CF
<10
-10
mbar
ISO
<2 x 10
-9
mbar
Minimum backing pump
displacement
12 m
3
h
-1
Recommended backing pump
RV12
