Page 22 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

List of Lessons Learned

Chapter 1 Project Lessons Learned 2.8: Critical centrifugal pumps and ‘bad actor’ pumps
require operator surveillance.
1.1: Failure to incorporate ‘Lessons Learned’ during the pre- 2.9: Centrifugal pump flow is determined by the head
FEED phase of the project. required by the process.
1.2: Failure to establish project team support early in the 2.10: Failure to install discharge orifices in high speed pumps
project. reduces MTBF.
1.3: Not screening vendors for experience for the project. 2.11: Pump NPSH margins are traditionally set for only the
1.4: Failure to consider the proper selection and design of rated operating point.
each item in the equipment train. 2.12: Selecting a pump for NPSH required without
1.5: Excessive specs and incomplete data sheets reduces considering suction specific speed.
2.13: Pump bearings with a DN number above 350,000 are
safety, reliability and plant revenue.
1.6: Absence or lack of ITB vendor instructions results in prone to low bearing MTBF.
endless meetings and emails. 2.14: Optimum MTBFs for high DN pumps is not possible
1.7: 80% of machinery failures are due to process changes without continuous lubrication.
not considered in the design phase. 2.15: Many pump failures have been caused by poorly
1.8: Failure to have pre-bid meetings will reduce critical designed temporary suction strainers.
machinery safety and reliability. 2.16: EP&Cs and end users do not have guidelines for the use
1.9: Using the EP&C typical bid tabulation format extends of min. flow bypass valves.
the bid cycle time. 2.17: Low centrifugal pump flow results in pump damage and
1.10: Poorly planned pre-award meetings will affect project exposure to safety issues.
schedule and result in cost adders. 2.18: Internal type bypass valves can fail to open at the
minimum flow set point.
1.11: Poorly planned VCMs will result in cost adders and
delivery schedule extensions. 2.19: Centrifugal pumps operating in parallel are prone to
damage from liquid vaporization.
1.12: Failure to conduct timely design audits affects
machinery safety and/or reliability. 2.20: Excessive pump flange and foundation forces will lead
1.13: Inefficient vendor and EP&C document reviews will to low bearing MTBF.
cause delivery delays. 2.21: Many pumps have impellers that are too large for field
1.14: Failure to conduct an effective FAT will expose the end operation parameters.
user to future reliability issues. 2.22: Lack of a plant spare changeover philosophy reduces
pump MTBFs.
2.23: Impeller diameter increases have resulted in driver and/
or coupling overloads.
2.24: Controlling centrifugal pumps with control valves is not
Chapter 2 Pump Lessons Learned energy efficient.
2.25: Operators need to understand the use of centrifugal
2.1: Not using lessons learned to select the pump will lead to pump test curves.
lower pump reliability.
2.2: Letting the EP&C select pumps can lead to lower pump
reliability.
2.3: Changes in operating conditions will cause lower pump
reliability. Chapter 3 Compressor Lessons
2.4: Leaving pump case design to the EP& C can lead to field Learned
safety and reliability issues.
2.5: Double suction pumps have the greatest amount of field 3.1: Improper compressor selection will reduce safety and
reliability problems. reliability.
2.6: Operating an inducer pump outside its BEP by more 3.2: Inaccurate process conditions cause project scope
than +/- 10% lowers reliability. changes and increase delivery time.
2.7: Failure to establish EROE limits will lead to low MTBF 3.3: Failure to use the proper case design and number of
of centrifugal pumps. impellers reduces reliability.

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