Page 571 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Be st Practice 1 0.7 The Post-Shipment Phase: Installation, Pre-Commissioning, Commissioning and Start-up Best Practices
1.4 In general the oil flush shall be performed using back up screens will be installed at the main oil return,
selected permanent auxiliary equipment which is part degassing tank inlet and return and reservoir oil fill
of the vendor supply package. This will include the connection. These screens will be in place during all
following: flushing operations. A drain should be fitted at lower
- Auxiliary oil pump (electrical) and main oil pump if point of return lines ahead of screen in order to deal
possible. with a blocked screen. Also, a pressure device
- Main oil filter to be in position for all flushing. (manometer e i.e: simple length of plastic tubing) is to
- Main oil reservoir, degassing tank, overhead seal oil be installed at this point to monitor any pressure build-
tanks and seal oil traps. up due to blockage.
- Skid piping. 2.6 The reservoir shall be filled with the lube oil specified
- Selected instruments and controls. for permanent plant operation unless directed
2. Preparation otherwise by the owner.
2.1 Any residual oil from factory testing must be removed 2.7 Lube oil flush should not occur until the compressor
from the reservoir and filters. Relief valves must have skid has been fully grouted.
been checked prior to flushing. 2.8 The compressor rear bearing port cover and the load
2.2 The reservoirs, degassing tanks and filter casing must be coupling guard must be installed in order to minimize
wiped clean, inspected and approved by the owner. All any oil spill during flushing.
cleaning must be carried out using a lint free cloth. 2.9 The vent piping must be checked out for mechanical
When filters are open for cleaning, special care should completeness.
be taken to avoid contaminates falling into ‘clean’ side of 2.10 Check for correct operation of the auxiliary lube oil
filter housing. pump on/off/auto switch and the oil high temperature
2.3 The filters must be verified to be in place and alarm before commencing flushing.
satisfactory for flushing. Examination of filters will 2.11 The instruments required for the flushing operation
include checks for bypassing, inside or outside of filter shall be identified on a P&ID mark-up for flushing and
housing. will be calibrated for normal operation prior to starting
2.4 All lube and seal oil interconnecting piping will be the oil system.
installed consistent with normal operating conditions in 2.12 Add nitrogen bottles or instrument air connections at
accordance with bypass piping arrangements as suitable tapping points downstream of lube and seal oil
mutually agreed upon between vendor and owner. filters.
- All equipment supply and drain piping is required to 2.13 Water to oil coolers shall be provided.
be flushed during entire flushing operation. Location 2.14 An auxiliary boiler will be provided to heat the oil to
of all valves, bypasses and screens shall be in approximately 82 C (180 F).

accordance with marked-up P&IDs of lube oil, seal 3. Flushing procedure
oil and control oil system. 3.1 The range of temperatures for the hot oil circulation
- Add hand valves suitable to meet the operating flush shall be 50 C e 82 C (120 F e 180 F). Before

requirements during flushing to all piping supply initial circulation the oil should be heated to
points. approximately 50 C (120 F).

- All lines to the steam turbine throttle valve, servo 3.2 The following parameters shall be documented in the
motors and dump devices will be flushed in log on an hourly basis:
accordance with a manufacturer’s requirements. - Pump discharge pressure
- Overhead seal oil tanks will be flushed by jumpering - Bearing header pressure
to compressor reference gas lines between - Oil reservoir temperature
compressor, overhead tanks and drainers are - Bearing header temperature
required to be flushed. - Oil filter differential pressure
2.5 Stainless steel 100-mesh screens with back-up 60-mesh - Filter in use
screens with a number of spares must be fabricated with - Sections of piping being flushed
retaining gaskets and installed at selected lube oil piping - Start time
flanges. This fabrication involves cutting and fitting the 3.3 The drain oil sight flow gauges shall be continually
screen to the gaskets. Screens must be clearly and monitored for flow at all places. The complete filling of
permanently tagged for ease of identification. Location the sight glass indicates a flow blockage. Immediate
for screens must be agreed with by vendor and owner. action shall be taken to stop circulation and clean filter
Basically, they should be positioned at all inlets to the screens. The debris obtained on the screen shall be
machine. Locations immediately after risers must be collected into plastic bags, identified by screen location,
avoided. Additionally, 100-mesh screens with 60-mesh machine number and time.

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