2. Desmi Pumps in operation at LHCA P4 & P6
TE/CRG-me
Steffen Junker
OMP May 2017

3. History of Desmi oil pumps presentations
OMP
OMP Oil pumps
MEOMP Desmi
MEOMP critical spare-parts
CPMA
MECPMA

4. Introduction : Desmi QSCA-4/6
Main task:
In order to control the compressor temperature, oil is injected into the compressor press room by the Desmi pump which provides the required oil pressure
Main issues:
No spare DESMI oil pumps;
No identical oil pump can be bought;
Oil pumps working point close to cavitation zone;
Several bearings and shaft seal issues noted;
All low stage compressors may run without DESMI oil pump,
But operation of high stage compressors is significant reduced.

5. Proposal Actually installed pump type Alternative pump type Costs for
Kral vertical in-line volumetric pump with magnetic coupling
Advantages.
No additional space needed;
Minor pipe modification required;
Thanks to magnetic coupling no shaft seal issue;
Constant flow independent of pressure drop
no cavitation issue
Dis-advantage:
- Soft-starter required
Desmi vertical in-line centrifugal pump
Costs for
alternative Kral pump type KV-550 to replace Desmi NSL80 (Booster)
12kCH without soft-starter
alternative Kral pump type CGV-1101 to replace Desmi SL125 oil pump (High stage)
26kCH without soft-starter

6. Conclusion
Proposal based according to the good experience coming from Atlas MR compressor station where the centrifugal pump was replaced by a volumetric pump including a magnetic coupling.
CRG-ME suggests to replace during YETS at one compressor station (P4 or P6) the Desmi pumps with Kral pumps.
Advantages:
Desmi spare pumps would be available;
Only insert Kral pump is required to fulfill spare part request
(Spare motor to be checked with CE).
01/09/2014
TE/CRG-me SJ

7. Many thanks for your attention