BOC Edwards 18B4B, Instruction Manual, Page: 13 / 62

Feb 04 Issue A
18B4B Vapour Booster Pumps
PAGE
7
7
TECHNIC
A
L
D
A
TA
2 TECHNICAL DATA
2.1 Operating and storage conditions
2.2 Performance
Notes: The performance data in Table 2 and in Figure 2 is for use of the pump with Apiezon AP201 fluid.
The pumping speeds and throughput specified below and shown in Figure 2 were calculated from
measurements made with partial pressure gauges. If total pressure gauges are used, the calculated
values for pumping speeds are approximately 10% lower. This is because partial pressure gauges do
not measure the pressure added to the system by condensable gases.
We do not give absolute values for the ultimate pressure of the pump. The ultimate pressure depends
on the fluid used in the pump, the leak tightness of the system, outgassing from surfaces, and the use
of cold traps.
Maximum ambient operating temperature
Typical surface temperature during operation
Jet stage cone
Boiler
Maximum surface temperature during operation
Jet stage cone
Under covers/below the pump
Minimum backing pump displacement
Recommended BOC Edwards backing pump
40
o
C
30
o
C
200
o
C
55
o
C
250
o
C
190 m
3
h
-1
GV260M, E1M275
Table 1 - Operating and storage conditions
Performance curves
Maximum system pressure (absolute)
Critical backing pressure
Pumping speed (ISO)
Air
Hydrogen
Maximum throughput (air)
Backstreaming rate at ultimate vacuum
Fluid loss at 1 x 10
-1
mbar, 10 Pa
Warm-up time to maximum throughput
Cool-down time (to approximately 100
o
C)
See Figure 2
1.3 bar absolute, 1.3 x 10
5
Pa
2 to 2.6 mbar, 2 to 2.6 x 10
2
Pa
4000 l s
-1
6000 l s
-1
100 mbar l s
-1
, 1 x 10
4
Pa l s
-1
0.7 mg cm
-2
min
-1
10 g h
-1
60 min
120 min
Table 2 - Performance data