Page 389 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer
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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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