Operation; Media Compatibility; Figure 19 Commission And Operation Schematic - Edwards nHT10 Instruction Manual

7. Operation

7.1 Media compatibility

The pump is not suitable for handling oxygen above normal atmospheric concentration.
Consult us before specifying pumps for use with high hydrogen content. Refer to
Installation

Figure 19 Commission and operation schematic

pumps P1 and P2
Valve V2 opens
P < 5 x 10
nHT is started
P < 5 x 10
Valve V2 closes
Valve V3 opens
pressure chamber
<5 x 10
Valve V2 opens
Valve V3 closes
Valve V1 opens
evacuation with nHT
Valve V1 closes
nHT is switched-off
Temperature
Valve V2 closes
End of process
B31430880_C
B31430880_C - Operation
on page 30.
Backing
are started
mbar
-1
Pump
fluid = T &
Backing pump
max
mbar
-2 P3 is started
Valve V4 opens
Delivery
Evacuation of nHT
mbar
-2
Valve V4 closes
Application
Valve V4 opens
Valve V2 closes
nHT is switched-off
Temperature
< 100 °C
Valve V4 closes
Backing pumps P1 and P2 are started by the customer
Evacuation of nHT
A pressure of 5 x 10
nHT is started + pump fluid is getting heated
Max. temperature of the pump fluid
+ pressure of 5 x 10
evacuation of the chamber up to delivery pressure
With a Backing pump P3 present:
nHT pressure will be maintained
Evacuation of customer's chamber up to
nHT's delivery pressure
Evacuation of customer's chamber via nHT
Application end of process:
valve V1 (valve to chamber) is closed
+ nHT is switched-off
Evacuation of nHT via backing pumps P1 + P2 optional
maintaining support pump P3 + switching-off the nHT
Temperature of nHT < 100
valves V2 + V4 are closed, nHT remains evacuated
< 100 °C
Backing pumps P1, P2, (P3) are switched-off
Page 41
mbar present:
-1
mbar present:
-2
C:
o
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