Acid cleaning and oil flushing of LUBRICATION
oil line of BFP
OBJECTIVE:-
To obtain clean lubrication oil and dirt free lubrication oil tank at Hydraulic coupling.
The pipelines shall be disassembled from flange joints after
initial layout and welding completion.
Each pipeline shall be acid cleaned by soaking method.
After neutralization and passivation of each pipeline, the
pipelines shall be reassembled for oil
Flushing .
Oil flushing for working oil and lub. oil circuits shall be done
separately. Necessary temporary
connections shall be done for this purpose. Necessary temporary
connection can be done during
erection stage and after flushing temporary connection can be
removed and can be used in other
units.
During oil flushing of lub. oil circuit bearings shall be
initially kept bypassed using temporary loops.
Subsequently bearings shall also be included in the flushing
circuit.
After completion of oil flushing the oil used for flushing shall
be drained. Bearings shall be inspected
and cleaned.
Recommended fresh oil shall be topped up in the tank as per OEM
manual.
Following inputs required for acid cleaning and subsequent oil
flushing.
Availability
of DM Water and Service Water.
Availability
of following chemicals:
Hydrochloric Acid 30% Min ( IS : 265 : 1993 )
Rodine 213 SPL as inhibitor
Sodium Nitrite
Liquor
Ammonia 25% ( IS : 799 – 1990 )
Lime Powder
( IS : 1540 : 1990 -Part II )
Availability
of adequate number of wooden plugs
Availability
of Service Air
Availability
of required grade and quantity of lub. oil
Availability
of L.T. Power Supply
Availability
of Lab service for efficiency test of inhibitor and for testing of Moisture
& Mechanical
impurities
in oil .
Availability
of adequate lighting and telephone facility in lub oil flushing area
Availability
of manpower with tools and consumables like cloth etc
Availability
of portable centrifuge / Electrostatic Oil Filtration unit.
Precaution
to be taken for fire safety .
Requirement
of cooling water if thermal shock is
necessary.
ACID
CLEANING ( Soaking method ) -BHEL
The
dissembled pipeline pieces are filled with DM water and flushed few times. It
is ensured that
there is no
leakage through the wooden plug provided at one end of the pipe.
5%
Hydrochloric acid with 0.2% inhibitor ( Rodine 213 SPL ) is filled in the
pipes. Efficiency test of
the
inhibitor is done prior to its use as per NACE procedure.
The solution
is allowed to soak in the pipes for 4 (four) hours and then drained in a safe
place and
neutralized.
This is then disposed of with plenty of service water.
The pipes
are flushed with DM water for 5 to 10 minutes.
The pipes are again filled with 2.0% Sodium
Nitrite & 5.0% liquor ammonia solution. The solution is
allowed to
soak for 30 minutes and then drained.
The pipe is
rinsed with DM water till pH of discharged water is between 6.5 and 7.5.
The internal
surface of the pipes is dried with dry compressed air.
The lines
are filled with lub. oil and uniform oil film is achieved through out the
internal surface of
the pipe.
The ends of the pipes are kept properly capped till the pipes are reassembled.
XXX- All the
operation is done at water treatment plant because acid handling facilities
will be better
There. If
that facilities are not there then temporary facility to be developed at site
as acid mixture
Cannot be
discharged in the drain.
continued to part -v
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