Page 433 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Be st Practice 7 .16 Lube, Seal and Control Oil System Best Practices
K. Simulate maximum control oil transient flow requirement
(if applicable) and confirm auxiliary pump does not start. G. Temporary piping (jumpers)
L. Start auxiliary pump, with main pump operating, and 1. All temporary piping used must have all particles such as
weld slag or splatter, sand, grit, etc., removed and piping
confirm control valve and/or relief valve stability.
must be cleaned and pickled. The use of clean flexible
Note: Some systems are designed to not lift relief valves hose is permissible.
during two pump operation. 2. Temporary connections into the system reservoir must be
sealed against ingress of dirt.
III. Corrective action
3. Temporary return lines should be elevated such that the
A. Failure to meet any requirements in Section II requires filters will remain full when pumps are turned off rather
corrective action and re-test. than allowing them to empty by gravity. This will greatly
B. Specifically note corrective action. reduce possibility of filter damage when starting pumps
C. Sign off procedure as acceptable to operate. and may eliminate need to continually vent filters on
start-up during flushing operations.
H. Flushing procedure
Typical oil console test agenda (Courtesy of 1. GJO QC inspector to verify carbon steel pipe has been
G.J. Oliver, Inc.) cleaned and pickled prior to flushing system.
I. 2. Remove all shop test orifices from oil supply lines if
present and remove transfer valve plug(s), clean valve if
A. Flushing oil necessary.
1. Viscosity e 150e185 SSU @ 100 F 3. Install GJO filter elements if necessary and install screen

2. Flash point e 385 F @ reservoir return flange only.

3. Oil soluble e yes 4. Inspect reservoir for cleanliness and clean if necessary.
4. Rust inhibiting e yes 5. Fill reservoir with specified flushing oil through a 10
5. Cleanliness e 10 microns maximum nominal micron filter, seal all reservoir openings.
6. Close valves in valved orificed bleed lines that return to
Reuse of oil should only be done if purified and tested after
each use to determine if the properties are still satisfactory. reservoir from instruments, etc.
7. Specified flow conditions, oil temperature should be
B. Flushing oil temperature increasing toward design during initial flushing.
1. The flushing oil in the system must be brought up to a. Flush all supply lines; be sure to include each side of
temperature (120e130 F) as soon as possible. The oil a cooler or filter set and control valve hand bypass

temperature must be maintained at this range after the piping. Flush each line for one hour. The total flushing
initial flush. Be careful not to exceed safe limits for system time will vary depending on number of sections to be
components, paying particular attention to pumps. isolated to obtain maximum flow.
C. Flushing flow b. At one-half hour intervals the pumps are to be turned
1. Initial flushing flow in lines should be equal to or more off and left idle for at least five (5) minutes after coast
than the contract design oil flow for the lines. This can be down. Flowing pipes must be vigorously hammered
accomplished if two pump operation is used. In no case while pumps are running. Check flushing screen at
should the initial flushing flow in a line be less than the reservoir return, clean if necessary.
line’s design flow. 8. Install flushing screens at all oil supply points.
2. Subsequent flushing flow in screened lines shall be at 9. Flush systems (screens installed) at specified flow and
maximum design flow only since greater flows could temperature conditions for one hour. After one-half hour
damage screen. switch all transfer valves to catch both sides of cooler and
D. Flow measurement filter sets (if applicable). The piping must be hammered
1. Oil flow at oil supply connections shall be measured with continuously.
flow meters. 10. Shut down pumps, remove and inspect screens;
E. Filtration contamination levels on screens may indicate areas
1. Flushing oil shall be filtered to 10 micron nominal where extra flushing efforts might be directed or if
maximum before entering system or system reservoir. pipe recleaning might be necessary before
2. G.J.O. standard filters shall be used while flushing. After continuing.
flushing, contract elements must be installed. 11. Flush system with no screens in oil supply lines at
3. Flushing screens shall be flat or cone SS 100 mesh screens specified flow and temperature conditions for 8 to 24
(plain weave, .004" wire dia. with 0.0059" square hours as required. Include the following:
openings) at each oil supply connection. a. Hammer all pipes at one hour intervals while pumps
F. System filter delta p delta p are operating.
1. The filter 6P must always be observed whenever starting b. Turn off pumps at two hour intervals and let set
a pump or switching a transfer valve. An excessive 6P idle for five (5) minutes after down before
spike would require checking for filter element damage restarting.
and modifying pump start-up procedure to avoid c. Switch cooler and filter transfer valves every two hours
excessive spikes. (if applicable).

404