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A301-51-880 Issue T
4
Operation
4.1
Operational safety
WARNING
Ensure that the cooling-air flow around the EH pump and pump motor is not restricted. If the air
flow is restricted, the pump and/or motor will get hotter than normal during pump operation:
This may result in reduced reliability or the risk of an explosion.
If the EH pump is part of an ATEX system, the high operating temperature may cause the motor
thermistors to shut down the system as required by the ATEX safety interlock circuit (refer to
Section 7 of the ATEX Instruction manual).
WARNING
During operation, parts of the EH pump can become very hot. Ensure that you do not touch the EH
pump.
WARNING
Do not operate the EH pump with the inlet or outlet open to atmosphere. If you do, your fingers
of other parts of your body may get trapped and you may be injured by the rotating pump
mechanism.
Ensure that the cooling-air flow around the EH pump and pump-motor is not restricted. (Refer to the ambient
temperature specification in
Section
2.1). Take all necessary precautions to avoid accidental contact with the EH
pump.
4.2
Start-up procedure
4.2.1
Pre-start checks
1. Check that the EH pump oil-levels are correct (see
Section
3.4).
2. If the EH pump is part of an ATEX system, ensure that the gearbox purge is connected and the Nitrogen supply is
on.
3. Check that the EH pump is correctly installed, especially after initial installation and maintenance.
© Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
A301-51-880 Issue T
5
Maintenance
5.1
Safety information
WARNING
Obey the safety instructions given below and take note of appropriate precautions. If you do not,
you can cause injury to people and damage to equipment.
A suitably trained and supervised technician must maintain the EH pump.
Dismantle the EH pump in a clean workshop environment, with the correct tools and safety facilities
available.
Ensure that the maintenance technician is familiar with the safety procedures which relate to the products
pumped. Wear the appropriate safety-clothing when you come into contact with contaminated components.
Dismantle and clean contaminated components inside a fume-cupboard.
Allow the EH pump to cool for at least three hours before you start maintenance work.
Vent and purge the pumping system with nitrogen before you start maintenance work.
Check that all the required parts are available and of the correct type before starting work.
Isolate the EH pump and other components from the electrical supply so that they cannot be operated
accidentally.
Re-check the EH pump rotation direction if the electrical supply has been disconnected.
Do not reuse 'O' rings and Co-Seals.
Dispose of components and waste oil safely (see
Section
6.2).
Take care to protect sealing-faces from damage.
Do not touch or inhale the thermal breakdown products of fluorinated materials which may be present if the
EH pump has been overheated to 260 ºC and above. These breakdown products are very dangerous.
Fluorinated materials in the EH pump may include oils, greases and seals. The EH pump may have overheated
if it was misused, if it malfunctioned or if it was in a fire. Edwards Material Safety Data Sheets for fluorinated
materials used in the EH pump are available on request: contact your supplier or Edwards.
Leak-test your system after installation and maintenance to prevent leakage of dangerous substances out of
the system and leakage of air into the system.
The EH pump will be contaminated with the process chemicals that have been pumped. Ensure that you take
adequate precautions to protect people from the effects of dangerous substances if contamination has occurred.
Table 21 - Maintenance plan
Operation
Frequency
Refer to Section
*
†
Check the oil-levels
Daily
or Weekly
5.3
Inspect the pump connections
Monthly
5.4
Change the pump oil
12 monthly
5.5
Lubricate the rear bearing
12 monthly
5.6
Overhaul the pump
6 yearly
5.7
*
Flammable materials pumped.
†
Non-flammable materials pumped.
© Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 43
Page 45
A301-51-880 Issue T
4.2.2
Start-up
Start-up the EH pump as described in the procedure below. This procedure assumes that the EH pump and the vacuum
system are at atmospheric pressure.
1. On all of the EH1200, EH2600 and EH4200 model pumps only:
Switch on the cooling-water supply and check that there is an adequate flow of cooling-water at the correct
pressure (see
Section
2.8).
If the EH pump is part of an ATEX system, ensure that the water flow rate is adequate, and that the flow-
switch indicates this.
Check the water connections for leaks.
Refer to
Section 2.8
for the cooling-water requirements.
2. Close all valves to atmospheric pressure and ensure that all other openings are closed.
3. Switch on the backing pump and open the backing valve (if fitted).
4. Switch on the EH pump.
5. Allow the EH pump to run for approximately fifteen minutes to achieve normal operating temperature.
6. Slowly open the pump-inlet isolation-valve (if fitted).
4.3
Shut-down
CAUTION
If the pump is to be shut down for a long period or is due to be shipped on, refer to
Section 6.1
for the storage
instructions.
1. Close the pump-inlet isolation-valve (if fitted).
2. Leave the pump operating for sufficient time such that the pump is thoroughly purged of any hazardous
substances.
3. Switch off the EH pump.
4. Open the backing pump air-admittance valve (if fitted) and switch off the backing pump.
5. On all of the EH1200, EH2600 and EH4200 model pumps only: turn off the cooling-water supply.
Page 44
© Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
A301-51-880 Issue T
5.2
Maintenance plan
WARNING
Constructional safety ensures that ATEX compliant EH pumps can safely pump flammable gases.
To ensure that the constructional safety of the ATEX compliant EH pump is not compromised, you
must maintain the ATEX compliant EH pump in accordance with the schedule given in
Table 21
using the procedures described in
Section 5.3
to
5.7
in this manual. If you do not, there may be a
risk of explosion and, if the pump is part of an ATEX certified system, the ATEX certification may
be invalidated.
Table 21
details the maintenance operations necessary to maintain EH pumps in normal use. Instructions for each
operation are given in the section shown.
More frequent maintenance may be required if the EH pump is used to pump corrosive or abrasive gases and vapours.
If necessary, adjust the maintenance plan according to your experience.
5.3
Check the oil-levels
WARNING
Ensure that the correct grade of oil is used and that the oil-levels in the pump are correct. If an
incorrect oil is used or if an oil-level is incorrect, EH pump performance may be affected and the
EH pump may be damaged, which will compromise its constructional safety.
Note:
If there is a loss of oil from the shaft-seal reservoir, the shaft-seal may have failed. Contact your supplier
or a Edwards Service Centre for advice.
Use the following procedure to check the oil-levels in the sight-glasses. Refer to
Figure 1
and
2
for the location of
the filler-plugs and sight-glasses. During normal operation, the hydrokinetic drive/gearbox sight-glass
(Figure
item 3) may appear empty or show a froth because the oil is in circulation around the coupling.
1. Shut down the EH pump, vent it to atmospheric pressure and allow it to cool.
2. Refer to
Figure
11. Check the shaft-seal oil-level. If the oil-level is below the bottom of the reflector plate (6),
refer to
Section 3.4
and refill the shaft-seal reservoir.
3. Check the hydrokinetic drive/gearbox oil-level. If the oil-level is below the top of the reflector plate, refer to
Section 3.4
and refill the hydrokinetic drive/gearbox oil reservoir.
4. On all EH1200, EH2600 and EH4200 model pumps only, check the gear-cover oil-level. If the oil-level is below the
middle of the reflector plate, refer to
Section 3.4
and refill the gear-cover.
5.4
Inspect the pump connections
1. Check that the cooling-water connections are secure.
2. Inspect the cooling-water pipelines and connections for corrosion, leaks and damage.
3. Check that the electrical connections are secure.
4. Check the electrical supply cables for damage.
5. Inspect all the vacuum pipelines for corrosion and damage. Check that all the vacuum connections are secure.
6. On chemical and ATEX compliant EH pumps only:
Inspect the hydrokinetic drive/gearbox purge nitrogen supply pipeline for corrosion and damage.
Check that the pipeline connection to the hydrokinetic drive/gearbox is secure.
Page 46
© Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
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