Dear All;
Kindly guide me to decide what is the correct stand in the following issue?
For our new Chlor Alkali plant we are installed chlorine compressor of M/s Siemens make
940KW,10088 Rpm, 10048 nm3/hr flow 3 stage centrifugal compressor driven by electrical motor.
Oil system main oil pump shaft driven 188l/min and pressure of 5 kg/cm2
Auxilary oil pump same capacity as main oil pump but motor driven.
My concerns:-
1.In case of stopping of compressor if auxilary lube oil system malfunction wheteher lead to bearing failure.
The answer from the vendor is coast down time will be taken care by the shaft driven pump if auxilary lube oil system malfunctions.
Whether the main oil pump will supply oil till stand still? Whether this is checked any stage or how can we rely on that?
2. Incase total lube oil sytem failure as per API 614? how the failure is taken care.
Vendor says the double failure is not taken care in their design and that ocuurance is unlikely and our preference for run down tank/ emergency pump they are not accepting
What shoul be our stand?
3. how reliability of auxilary system can be ensured while compressor running since logic is that if main ol header pressur falls below 2.3 kg/cm2 auxilary lube oil pump starts and if falls below 1.7 kg/cm2 compressor trips.
4.Quote from API
When specified, an emergency oil pump shall be furnished to allow safe shutdown without damage to the equipment in the event that both the main and standby pumps fail.
The purchaser will define the requirements for safe shutdown.
Can we follow this stand?
5.“ Definition of emergency oil pump: A separate oil pump that provides adequate pressure and capacity to permit safe shutdown of the equipment when the main and standby pumps are
inoperable.”
API doesn’t says electrical failure/main oil pump shaft driven; regardless of condition this is arrangement for safe shutdown of the equipment when the main and standby pumps are
inoperable.
What is the justification for the deviation emergency oil pump is not applicable or not needed?
6.Lube-Oil Rundown Tanks
1.9.2.1 When specified, a separately mounted emergency lube-oil rundown tank (either atmospheric or pressurized) shall provide oil for the coast-down period specified by the
Purchaser.
Kindly guide
Kindly guide me to decide what is the correct stand in the following issue?
For our new Chlor Alkali plant we are installed chlorine compressor of M/s Siemens make
940KW,10088 Rpm, 10048 nm3/hr flow 3 stage centrifugal compressor driven by electrical motor.
Oil system main oil pump shaft driven 188l/min and pressure of 5 kg/cm2
Auxilary oil pump same capacity as main oil pump but motor driven.
My concerns:-
1.In case of stopping of compressor if auxilary lube oil system malfunction wheteher lead to bearing failure.
The answer from the vendor is coast down time will be taken care by the shaft driven pump if auxilary lube oil system malfunctions.
Whether the main oil pump will supply oil till stand still? Whether this is checked any stage or how can we rely on that?
2. Incase total lube oil sytem failure as per API 614? how the failure is taken care.
Vendor says the double failure is not taken care in their design and that ocuurance is unlikely and our preference for run down tank/ emergency pump they are not accepting
What shoul be our stand?
3. how reliability of auxilary system can be ensured while compressor running since logic is that if main ol header pressur falls below 2.3 kg/cm2 auxilary lube oil pump starts and if falls below 1.7 kg/cm2 compressor trips.
4.Quote from API
When specified, an emergency oil pump shall be furnished to allow safe shutdown without damage to the equipment in the event that both the main and standby pumps fail.
The purchaser will define the requirements for safe shutdown.
Can we follow this stand?
5.“ Definition of emergency oil pump: A separate oil pump that provides adequate pressure and capacity to permit safe shutdown of the equipment when the main and standby pumps are
inoperable.”
API doesn’t says electrical failure/main oil pump shaft driven; regardless of condition this is arrangement for safe shutdown of the equipment when the main and standby pumps are
inoperable.
What is the justification for the deviation emergency oil pump is not applicable or not needed?
6.Lube-Oil Rundown Tanks
1.9.2.1 When specified, a separately mounted emergency lube-oil rundown tank (either atmospheric or pressurized) shall provide oil for the coast-down period specified by the
Purchaser.
Kindly guide
