Page 32 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Be st Practice 1 .4 Project Best Practices
The decision not to use a certain vendor may be difficult,
because of past associations, but it is in the end user’s interest to Risk classification Action
only select the vendors that have the most design and
Prototype Design and manufacturing pre-screening
manufacturing experience for a specific application. Vendors not in pre-FEED phase
having the required level of experience for this application Multi-component Design audit in bid phase* *
should be informed immediately, to save them the high costs inexperience
of quoting. It should be explained that the decision taken is not an Single-component Design audit at coordination meeting* *
expression of the quality of their design and manufacturing, inexperience
but of their relative experience level for this specific application, * *= Manufacturing audit may be required based on design
and this will definitely not impact future business opportunities.
After the potential vendors are determined, the degree of risk
for this application must be defined to determine when and if Fig 1.3.2 Risk classifications and action
audits are required. Figure 1.3.2 presents these considerations
for critical un-spared machinery.

Best Practice 1.4Practice 1.4
Best
Select and design each equipment item in the train for Not considering the proper selection and design of each train
optimum safety and reliability. component can reduce safety and reliability and revenue by:
The safety and reliability of the equipment train is directly affected Driven equipment experience, mis-application and design issues
by each item in the train (unit). Driver experience, mis-application, insufficient power and design
Consider the proper design and selection of each train item. Devote issues
the same attention to design and experience review for each train item. Coupling and/or gear experience, insufficient torque capability, and
The equipment items contained in any train are: design issues
The driver Auxiliary system experience, improper component selection and
The driven equipment sizing
The transmission devices (couplings, gears and clutches)
The auxiliary systems (lube, control, seal, cooling, etc.) Benchmarks
The majority of factors that reduce reliability are contained in the This best practice has been used, especially for critical (un-spared)
auxiliary systems. They should be carefully reviewed in the pre-bid trains since the 1970s, and ensures optimum safety and reliability and
phase and design audited for proper selection and sizing early in the maximum revenue over the life of the process. It has been incorporated
design phase. globally in all upstream and downstream projects.
Optimum machinery train reliability has resulted from this Best
Lessons Learned Practice, saving upwards of $2m (minimum) per year for plants with
Failure to consider the proper selection and design of each daily revenues of $1m.
item in the equipment train will lower train (unit) safety,
reliability and revenue.

B.P. 1.4. Supporting Material Each machinery train or unit is made up of all of the four
classifications. The safety and reliability of the train is directly
related to the proper selection and design of each of these
Classifications of rotating equipment classifications. Failure to consider the proper experience, se-
lection and design of each train component will result in lower
There are four basic function classifications of rotating equip- train safety and reliability. Table 1.4.1 is a partial listing of some
ment. Refer to Figure 1.4.1 for a definition. rotating equipment types, grouped according to their classifi-
cation (function).

Driven
Drivers or prime movers (provide power) Site equipment examples
Transmission devices
Auxiliary equipment
Shown below are examples of typical site rotating equipment.
Figures 1.4.2 to 1.4.5 show examples of each rotating
Fig 1.4.1 Classifications of rotating equipment equipment classification.

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