Page 389 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer
P. 389
Be st Practice 7 .5 Lube, Seal and Control Oil System Best Practices
A. Pump selection Main Auxiliary
Positive Centrifugal ) 9. Driver starting time
displacement main/aux 10. RPM-rated speed ______________ ______________
Main/aux
Note: Confirm sufficient steam is available at minimum energy
1. Pump type ________________ ________________ )
conditions. Calculated for minimum energy conditions (minimum
2. Make ________________ ________________
steam energy or motor minimum starting voltage) and pump rated
3. Model ________________ ________________ conditions. If greater than three (3) seconds, accumulator(s) should
)
4. Speed ________________ ________________ be used.
5. Disch. press @ 10 ________________ ________________
centistokes (60 SSU [rated])
D. Relief valve selection (Positive displacement
6. Disch. press @ max. ________________ ________________
pumps only)
centistokes (SSU)
7. Rated flow @ 10 centistokes ________________ ________________ 1. Pump max. discharge pressure at max. viscosity ¼ ______________
(60 SSU)
2. Relief valve pressure ¼ 1.1 D1 or 172 kPa ______________
8. Flow @ max. SSU ________________ ________________
(25 PSI) greater, whichever is higher.
9. Flow @ relief valve press ________________ ________________ Relief valve type (modulating preferred) ¼ ___________
(positive displacement
Model ¼ ___________
pump only)
10. Rated kW (BHP) ________________ ________________ Set pressure ¼ ___________
Overpressure (pressure to pass full flow)-kPA (PSI) ¼ ___________
11. Max. kW (BHP [@R.V. and ________________ ________________
max. viscosity]) Normal leakage (valve closed) ¼ ___________
12. NPSH available-m (ft) ________________ ________________
13. NPSH required-m (ft) ________________ ________________
14. Suction lift (if pumps are ________________ ________________ E. Reservoir sizing (based on rectangular tank)
Per API 614
mounted above fluid level-m
[ft])
1. Normal flow liters/min (GPM) ¼ ______________
)
If steam turbine driver is used, it is recommended that speed should be 2 pole 2. Retention time (minutes) ¼ ______________
(3600/3000 RPM) motor speed to minimize steam rate. 2A Capacity ¼ (1) (2) (Refer to ______________
Figure 7.5.9)
B. Coupling selection Confirm size
3. Reservoir length width mm (inches) ¼ ______________
Main Auxiliary
4. Capacity cm (inch) of height ¼ ð3Þ
3
1. Pump ________________ ________________ 231 in: =gal
2. Coupling model ________________ ________________ ¼ ______ liter/cm (gal/
3. Size ________________ ________________ inch)
4. Driver max. ________________ ________________ 5. Level E (pump suction level) ¼ ______ cm (in) above
power-kW (HP) grade
5. kW (HP)/100 RPM ________________ ________________ 6. Level D (suction loss level) ¼ (5) þ level required
6. Coupling kW ________________ ________________ to
(HP)/100 RPM ¼ maintain prime
¼ ______________
Note: Confirm appropriate coupling service factor is used. Rotary 7. Level C ¼ (6) þ 5 (minutes) (1)
(PD) pumps require a higher service factor.
Note: 5 minutes ¼ Working time
Working capacity (volume between levels C & D) or level C
C. Driver selection
Main Auxiliary ¼ 8ðminÞ ð1Þ þ tank bottom height above grade
ð4Þ
1. Service ______________ ______________
2. Type ______________ ______________ Note: 8 minutes ¼ retention time
3. Speed ______________ ______________ Retention capacity ¼ volume between bottom of tank and
4. Pump max. power kW (HP) ______________ ______________ level C.
5. Driver rated power kW (HP) ______________ ______________ 8. Level B ¼ Highest level of oil during operation
( ¼ 1.1 pump max. kW (approximately 1 minute retention time)
or HP) 9. Level A ¼ Highest level oil can reach
6. Driver normal power (@ 10 ______________ ______________ ¼ Level B þ capacity contained in all
centistokes [60 SSU])
components that drain back to the
7. Turbine steam rate kg/kW-HR ______________ ______________
reservoir O (4)
(lb/HP-HR [max/rated])
Note: This quantity should also include
8. Steam quantity @ minimum ______________ ______________
steam energy condition kg/HR allowance for interconnecting piping and
(lb/HR) any overhead tanks.
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