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A301-51-880 Issue T
5. If the direction of rotation of the coupling was incorrect:
Switch off the backing pump and vent the system; isolate the EH pump from the electrical supply; reverse
any two of the phase-wires in the motor terminal-box.
Repeat the check from Step 2 to ensure that the direction of rotation is now correct.
3.8
Connect the hydrokinetic drive/gearbox purge nitrogen supply
(chemical and ATEX compliant EH pumps only)
WARNING
Your nitrogen supply pressure must comply with the requirements of
Section
2.7. If it does not,
the purge pipelines may become over-pressurised and may explode.
WARNING
If your system incorporates an isolation valve between the chemical EH pump and your backing
pump, ensure that the purge nitrogen supply is switched off when the isolation valve is closed.
WARNING
If your booster pump is part of an ATEX system you have to connect the gearbox purge and
guarantee the Nitrogen supply.
1
Use a rigid metal (such as stainless steel) pipeline with an outside diameter of
/
inch for your nitrogen supply.
4
We recommend that you install an automatically operated isolation-valve in your nitrogen supply pipeline, configured
so that:
The hydrokinetic drive/gearbox purge nitrogen supply is on whenever the chemical or ATEX compliant EH
pump is on.
The hydrokinetic drive/gearbox purge nitrogen supply is off whenever the chemical or ATEX compliant EH
pump is off.
If your system incorporates an isolation valve between the chemical or ATEX compliant EH pump and the backing
pump, you must configure your system so that the purge nitrogen supply is switched off whenever the isolation valve
is closed. If you do not, and the purge supply is left on when the isolation valve is closed, the system upstream of the
isolation valve will become pressurised.
Refer to
Figure 2
and use the following procedure to connect your purge nitrogen supply:
1
1. Remove the
/
inch blanking plug from the hydrokinetic drive/gearbox oil filler-plug and purge connector
4
(Figure 2
item 4).
1
2. Fit a suitable
/
inch compression fitting connector to the purge connector.
4
3. Fit your nitrogen supply pipeline into the compression fitting and tighten to secure the connection.
© Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
A301-51-880 Issue T
3.10
External evacuation of hydrokinetic drive/gearbox (optional)
The hydrokinetic drive/gearbox may be evacuated using an external pump. A description of the connections required
is beyond the scope of this manual.
Contact your supplier or your nearest Edwards company for advice if you wish to use this facility.
© Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 39
Page 41
A301-51-880 Issue T
3.9
Connect the pump-inlet and outlet
WARNING
Do not exceed the load limits on the pump-inlet and outlet flanges as specified in
Figure
do, there will be a risk of leakage of process gases from the EH pump, or of damage to the EH pump.
WARNING
The ATEX compliant EH pumps rely on constructional safety for safe operation. If you will use the
ATEX compliant EH pump in a process in which dust or particles could enter and damage the ATEX
compliant EH pump, you must fit a suitable inlet filter.
WARNING
If particles, debris or loose components could enter the EH pump during commissioning, you must
fit a suitable inlet filter which you can remove before operating the EH pump on process duties.
WARNING
If you fit an isolation valve between a chemical or ATEX compliant EH pump and the backing pump,
you must interlock the operation of the valve with the operation of the chemical or ATEX compliant
EH pump, so that closure of the valve results in shut-down of the chemical or ATEX compliant EH
pump.
WARNING
If you will pump flammable gases, ensure that your backing pump and exhaust-extraction/
abatement systems comply with the critical backing pressure requirements of
Section
do not, there will be a risk of explosion during operation.
You must connect the inlet of the EH pump to your vacuum system, and connect the outlet of the EH pump to your
backing pump and exhaust-extraction/abatement systems, as required.
Pump-inlet and outlet connections are made with standard ISO flanges, Edwards trapped 'O' rings and (on the EH250
pumps only) a Edwards Co-Seal.
All of the EH2600 and EH4200 model pumps have two alternative outlet positions: on the underside of the EH pump,
and at the side of the EH pump.
As supplied, these EH pumps are configured to use the outlet at the side of the EH pump and the flange on the
underside of the EH pump is blanked off. If you do not wish to use the side outlet, remove the blanking-plate and 'O'
ring from the outlet on the underside of the EH pump and refit the blanking-plate with a new 'O' ring over the side
outlet-flange.
Take note of the following when you connect your EH pump to the vacuum system.
Move the EH pump to the required location and ensure that it is level and secure.
For optimum pumping speeds, ensure that the pipeline connected to the pump-inlet is as short as possible
and has a bore size not less than the inlet port diameter.
Use a flexible connection in the pipeline from the vacuum system to the EH pump to reduce vibration and
stress in the system pipelines (see
Section
3.2).
On very dusty applications, use a low-impedance inlet-filter to minimise abrasion in the EH pump.
Page 40
© Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
A301-51-880 Issue T
Figure 22 - Flange loading limits
Note:
EH250 pump shown. The flange
loading limits apply to all EH pumps.
Maximum force
Pump-inlet
Pump-outlet
FX
±1000 N
±224 lbf
±750 N
±168 lbf
1. Pump-inlet
FY
±1000 N
±224 lbf
±750 N
±168 lbf
2. Pump-outlet
FZ
±2000 N
±449 lbf
±1500 N
±337 lbf
F
Force
FR
±2400 N
±539 lbf
±1800 N
±404 lbf
M Moment
Maximum moment
Pump-inlet
Pump-outlet
R Resultant
X Load orientation
MX
±500 N m
±112 lbf ft
300 N m
± 67 lbf ft
Y Load orientation
MY
±500 N m
±112 lbf ft
300 N m
± 67 lbf ft
MZ
±500 N m
±112 lbf ft
300 N m
± 67 lbf ft
Z Load orientation
MR
±870 N m
±195 lbf ft
520 N m
±116 lbf ft
Page 42
© Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
22. If you
2.2. If you
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