CMS LEWA LDE1/M500
CO2 pumps
N° 574851-011.001
N° 574851-011.002
Order
LEWA offer N°SLL-27000370
from the 04/12/2013
DAI N°5514368 Created on the 13/12/2013 by Andrea d’Auria
Order N°CA 5514368 (1) sent to LEWA on the 16/12/2013
Pumps received at CERN on the 02/05/2014 and 13/05/2014
LEWA Pump N° 574851011.002
Hydraulic oil leak history
20/04/2015 – 30/03/2016
April 2015
First hydraulic oil leak detected in April 2015,
after few hours of operations
Bolts that we
have tried to
tighten more
but didn’t
move…
Suspected
gaskets
Mail sent to LEWA on the 20/04/2015
Oil droplets
June 2015
5
First intervention of a LEWA technician on the
18/06/2015:
6
Disassembly of the pump head and
replacement of the damaged piston seal
Problems during intervention:
1
◦ Gear box oil in hydraulic circuit
◦ Seal installed in wrong position
3
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JÉRÔME DAGUIN - EP/DT/FS
2
4
5
August 2015
Second intervention of a LEWA technician on the 05/08/2015:
Disassembly of the pump head and replacement of the damaged piston seal Same intervention
as on the 18/06/2015
Problems during intervention:
◦ Hydraulic oil spilled on the floor
Leak still present after few hours of operations…
Mail sent to LEWA on the 07/09/2015
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JÉRÔME DAGUIN - EP/DT/FS
6
September 2015
Scratch on the piston
Third intervention of a LEWA technician on the
16/09/2015:
Disassembly of the pump head and
replacement of the damaged piston seal
Scratch spotted on the piston. Polished with
sand-paper
Polished piston
Damaged seal
Leak still present after few hours of
operations…
Mail sent to LEWA on the 25/09/2015
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7
December 2015
Forth intervention of a LEWA technician on the
04/12/2015:
Disassembly of the pump head and
replacement of the damaged piston and piston
seal
Oil in the small
reservoir
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Discharge pressure
Pump speed
March 2016
Mass flow
Suction Pressure
After the intervention of the 04/12/2015, the pump was
running with no leaks until the 14/12/2015 when it was
stopped because of winter shutdown maintenance.
Suction temperature
Pump restarted on the 14/03/2016 and ran continuously
until the 29/03/2016
On the 28/03/2016 around 17h00 the flow delivered by
the pump (blue line) and the discharge pressure (yellow
line) started to decrease with no apparent reason. Nothing
was changed on the system at this time
A visit on site on the 29/03/2016 revealed a new oil leak
coming from the junction in between the head and the
pipe connecting to the remote head
The pump was stopped on the 29/03/2016 around 11:00.
Oil leak
location
After consultation with LEWA technician all bolts were retightened and operation restarted…
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9
LEWA Pump N° 574851011.001
Membrane spikes history
02/06/2015 – 30/03/2016
June 2015
First pressure spike in between the membrane
spotted on the 02/06/2015
After discussion on the phone with LEWA, we
inspected the head to check the presence of
oil in between the two membranes (report
from the 03/06/2015). No oil was found.
On that date the head was found not properly
tightened (4 out of 6 bolts not at the nominal
85 Nm torque).
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11
18/11/2015
November 2015
Pressure spikes reappeared in November and
became problematic (pressure stayed high in
between the two membranes) after
30/11/2015
20/11/2015
Mail sent to LEWA on the 01/12/2015
30/11/2015
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December 2015
Operation not possible after the 01/12/2015:
pressure in between the membranes rises
after few minutes of operations…
Pump flow (g/s)
Membrane pressure (bar)
Pump speed (rpm)
Mail sent to LEWA on the 02/12/2015
Pump suction
temperature (°C)
∆P across the pump
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JÉRÔME DAGUIN - EP/DT/FS
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December 2015
On the 04/12/2015, a technician from LEWA came to work on the other pump
Describing our problem on this pump, he decided to replace the membrane
(using our spare kit)
During the intervention the ring that holds the membrane was found
damaged
Since no spare part was available on that day it was decided to reassemble
the membrane with that ring and to change it in a later stage when available
from the factory
Damaged
membrane
ring
No pressure spikes were observed since the membrane replacement
The pump was running from 04/12/2015 until 14/12/2015 and is now back in
operations since 14/03/2016
On the 29/03/2016 we inspected the pump head (at the same time we
inspected the other pump) and found some oil drops at the bottom of the
head and few cm3 in the bucket placed under the head
This pump however does not show any signs of performances degradation
and is still running up to now
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