Page 570 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

The Post-Shipment Phase: Installation, Pre-Commissioning, Commissioning and Start-up Best Practices Best Practice 1 0.7
Maintaining a flushing log is important to ensure that all Final inspection and start-up checks
flushing procedure requirements are carried out. In addition,
periodic inspection of flushing screens is suggested to ensure The contractor and the customer must mutually agree on an
the job is proceeding smoothly. It is a common occurrence that acceptable hand over and sign off procedure. As a minimum the
the length of a flushing cycle frequently exceeds its predicted following items should be completed:
time. The procedure provided in the appendix and the guide-
lines presented in this section will ensure that flushing will be - All installation and long term storage requirements
accomplished in the minimum amount of time. However ef- - All auxiliary piping, installation, insulation and painting
fective a procedure is, it is only as effective as its imple- - All instrument and electrical loop checks complete and
mentation. Therefore, monitoring the flushing operation is proven operable
imperative. - All spare parts received and equipment documentation
Figure 10.7.2 presents additional considerations regarding available
flushing.
One final word regarding flushing: it has come to our at- First start, run-in and initial operation
tention that in an effort to ensure totally clean systems, too
many flushing screens are employed, resulting in excessive
flushing times. A common example of this practice is the After the equipment has been handed over, first start, run-in and
initial operation should be performed in accordance with proven
installation of flushing screens in drain lines. Since drain lines
are designed to operate only half full, a flushing screen will start-up procedures and planned operation procedures.
Figure 10.7.3 provides these considerations.
eventually become partially plugged. When it does, the level
Included at the end of this section are the following addi-
of the oil in the affected drain line will rise and will very tional documents that contain valuable guidelines for site pre-
effectively clean the top of the pipe. Since this is an abnor-
mal occurrence, and since one function of the reservoir is to commissioning and commissioning:
contain the sludge and prevent it from re-entering the - Site pre-commissioning best practice list for your use
system, excessive use of screens in drain lines should be - Functional lube/seal system test procedure outline
discouraged. - Electro-hydraulic governor functional test procedure outline
A practical recommendation would be to install one screen - Steam turbine solo run functional test procedure outline
in the main return to the reservoir for only the initial phases of
flushing. A convenient way to ensure that this screen is not
becoming plugged is to connect a temporary piece of plastic Auxiliary system flushing procedure
tubing to the bottom of the drain line close to the flushing
screen and monitor the level of the oil. When the level begins This information is provided courtesy of M.E. Crane, Consultant.
to rise in the plastic tube, shut down and clean the screen The following procedure is presented as a guide for field
before the level becomes excessive. Once the debris on the flushing of lube and seal systems. In order to be fully productive,
screen has leveled out, it is suggested that the screen be it is recommended that all requirements noted herein be strictly
removed. followed.

1. General
1.1 Flushing operation will be carried out by the designated
party (contractor or owner).
1.2 Cleanliness of oil console, equipment skid, overhead
seal oil tanks, piping systems and screens shall be
determined by mutual agreement between equipment
vendor, contractor and owner.
1.3 Owner and vendor shall keep a log for general review of
flushing progress. Master flow sheets shall be kept by
owner and updated to progress. An entry shall be made
during each shift.

1. Final inspection and hand-over accepted (all work complete,
all punch list items complete, loop checks complete)
2. Start-up procedure (optional) approved
3. Air run (compressors) optional
Procedure
Safety considerations
Limits of operations
Fig 10.7.2 Cleaning of equipment and associated piping e flushing
of lube and seal oil systems (cont.) Fig 10.7.3 First start, run-in and initial operation

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