A:LOn completing this section you should have a good understanding of the
operation of the ALCAP lubricating oil system pre-start checks starting
sequence
separation sequence discharge sequence stopping procedure
the pre-start checks check that the EPC is correctly programmed check that the
separator is correctly assembled check that the system valves are in the
correct position check the power supply with new installations particularly pay
attention to the supply is the voltage and frequency correct switch the power
on click the isolator on the starter box open EPC door by clicking on the door
handle click on power button top left check the
air supply it should be six bar check the water supplies I slashed low
pressure no if they required for ello px systems check the brake is it off all L
o PX separators have a break check the lubricating oil for the drive
starting the elk app system start the feed pump from the pump starter start
the heater from the epc 400 start off the separator listen and observe ensure
the separator is at full speed you can now click the alarm accept button and
step through the list indications now the process should be started push the
start separation button to make the EPC enter the start sequence start of
process sequence
the EPC enters the start sequence the first stage of this is parameter 50 the
closing of the bowl closing water is applied to the bowl MV 16 is activated
if the alarm except button is pressed once at this time the display should
show the timer parameter 50 counting down according to the parameter setting
parameter 90 has been set to 1 for this indication to be active the oil is still
recirculating through the heater start off process sequence
the next stage of the start of the process parameter 52 is where the oil
feed valve changes position and oil is fed to the bowl this is a stabilizing
period for the transducer the bowl fills with oil and cleaned oil is discharged
by the pairing disk a back pressure is established in the clean oil outlet the
minimum value of this back pressure will be dependent upon the delivery height
which is usually quite low from lube oil systems the operating back pressure is
set by the regulating valve midway between the delivery height pressure and
the pressure required to overflow the bowl the transducer reference is stored
by the EPC 400 at the end of this timer this timer runs for 120 seconds the next
stage is the addition of conditioning water parameter 53 which helps to keep
the sludge moist and thus helps with the discharge the aim is to add a
predetermined volume of water to the ball periphery this timer runs for a
time determined by parameter 12 times parameter 70 parameter 12 equals number
of conditioning water pulses parameter 70 equals the length of each pulse for
conditioning and displacement water this is longer or shorter time depending on
the size of your bowl in combination with the water flow rate from solenoid
MV 10 a volume of water will be added to the bowl MV 10 opens MV 10 a closes and
water goes into the center of the bowl under the distributing cone keeping the
water and oil segregated as long as possible helps to minimize the risk of
emulsification check discharge it is considered good practice to check
that the separator dance discharged this is done by pressing the discharge button
on the EPC this will be described in the discharge sequence
discharge sequence
p60 is the time to the first discharge thereafter it forms part of the total
time between discharges this is normally set to 10 minutes specific circumstances
may dictate otherwise our primary objectives are no oil losses no water in
the oil complete discharge of accumulated sludge and water
you remember that with the fuel oil our cap the plant discharged after parameter
1 thumbs out is initiated by displacement water being added until the
trigger point is reached with a lubricating oil our cap this is not the
case a predetermined quantity of water is added to displace the oil but not
enough so as to push the water into the disk stack and cause the trigger range
to reach 100 percent after the startup that first discharge takes place when
the timer parameter 60 runs count thereafter when parameter 1 parameter 60
plus parameter 61 runs out during parameter 60 and parameter 61 the
trigger level left side of the normal display in the EPC 400 changes by units
of one during parameter 62 and the addition of displacement water it
changes by units of five the timer runs for 60 seconds
the object here is to prepare the water detection system at a time when we know
water is about to be added to achieve this sensitivity the trigger level is
multiplied by 5 at the beginning of parameter 62 this times 5 is not
activated if the alarm for high water in the oil has been activated a 7 12 if
there had not been a change in the trigger level since the last reference
was stored then its value would be zero which when multiplied by 5 is still zero
say there had been a small change in the trigger level since the last reference
was stored for example to evaluate for multiplying by 5 the trigger level
display would then show 20 remember but if at any time the trigger level
reaches 100% the discharge is initiated and bowl opening water applied say there
had been a larger change in the trigger level since the last reference was
stored and the display was showing 20 when multiplying by five the trigger
level would be at 100 and the discharge takes place immediately there is one
other parameter I have to mention at this point parameter 19 this is normally
set to zero there may be circumstances when this factory set constant will have
to be changed this should only be changed by an alfa laval representative
when parameter 19 is set to one the trigger level is forced to be zero at
the beginning of parameter 62 the times five functions still applies and the
value of the trigger level goes up as the displacement water is detected
displacement water now go to the next page to see in detail displacement water
at the beginning of every time discharge that is when there is extremely low free
water in the oil displacement water is added to economize on oil losses this
stage is determined initially by the values of parameter thirteen and
fourteen factory set at ten pulses and two pulses the number of pulses is
adapted by the controller depending on specific conditions this adaptive nature
will be described later the bowl has a small quantity of conditioning water at
the periphery this water should fill in relation to the addition of the
discharge water passes there are two conditions for the initiation of a
discharge the trigger point is reached due to water reaching the disk stack
just the same as with the fuel oil our cap system this condition is now assumed
to be understood it will not be described here link back to discharge
sequence if required the predetermined quantity of displacement water has been
added after the series of water pulses and forces have taken place this will be
described here the controller waits after
some of the displacement water to see if this is enough to make the water reach
the disk stack this timer runs for 3.0 seconds reference time the new storm of
reference value can be higher or lower than the previous reference if at any
time the actual value of the transducer moves below the stored reference then
the reference moves down with it and stays there this timer runs for 30
seconds a small amount of conditioning water is added to help with the next
discharge this timer runs for a period determined by parameter 70 times
parameter 12 for a ello px 710 using factory settings this equates to 50
seconds now go to the next page to see the details a small amount of
conditioning water is added to help with the next discharge this timer runs for a
period determined by parameter 70 times parameter 12 for a hello P X 710 using
factory settings this equates to 50 seconds in the following pages we will
see discharge sequence in the following conditions normal condition flow water
content in the oil high water content in the oil adaptive adjustment of
displacement water the maximum time between sludge discharge depends on
process conditions and parameter 1 the time between discharge should be set
accordingly the factory setting of this time is 30 minutes P 1 equals P 60 Plus
P 61 when this condition exists which we would hope is most of the time
separation sequence follows discharge sequence and this situation continues
the rolling repetition of separation 30 minutes followed by discharge sequence
continues 10 times discharges which occur during the separation sequence
parameter 60 parameter 61 parameter 62 are not counted as part of the
accumulation towards the tenth discharge it is necessary to test the system to
ensure that the water which is added for displacement is actually detected by the
you sir that the 10th discharged the trigger level must increase by a minimum
of 30% this is an extra condition applied to the 10th discharge the
displacement water at the tenth discharge is added continuously as
pulses equal to the number of pulses at the last discharge in this case 10 per
pores of 30 seconds two more pulses added together if this was enough to
achieve the extra condition of an increase of 30% in the trigger level
display then the system is still functioning and displacement water is
still getting into the bowl if not then the tenth discharge is repeated a second
time this time the discharge water is added continuously for 12 pulses per
pause of 30 seconds two more pulses added together
if this was still not enough then the increase is repeated again if not then
the tenth discharge is repeated a third time this time that discharge water is
added continuously for fourteen pulses a pause of thirty seconds two more pulses
added together if this was still not enough then the increase is repeated
again if not then the tenth discharge is repeated a fourth time this time the
discharge water is added continuously for 16 pulses a pause of 30 seconds two
more pulses added together if this was still not enough then the increase is
repeated again the number of times this discharged water is increased before
alarm is determined by parameter 44 when parameter 44 has been achieved then
alarm a seven-eleven is activated the discharge counter is set to zero if the
trigger level change is detected or a seven-eleven is activated high water
content in the oil if a certain amount of free water is present in the oil
approximately equal to 0.5 percent it will be separated out in the bowl the
level moving towards the disc stack to be detected by the transducer in the
inlet a discharge will be triggered by the EPC 400 a new reference value is
then stored if this triggering occurs before the
maximum time between discharge has elapsed parameter 1 he was parameter 60
plus parameter 61 five times in a row then the alarm for high water is
activated a 712 this alarm can be accepted there is no automatic action
and a 712 continues to alternate in the display conditioning water is not added
when a 712 has been activated as it is not necessary to add any more water
click button to accept alarm action should be taken to identify and rectify
the source of the water increases if the maximum time between discharge collapses
without the trigger point being reached a normal discharge will take place the
total number of displacement water pulses will be the same as there was of
the last planned normal discharge unless it is the tenth plant normal discharge
in which case total pulses will be increased by two the a 712 alarm will be
cleared if the number of pulses added is greater than P 13/2 this is an L cap
separator that can only remove water from the system by discharge repeated
frequent discharging due to high water content in the oil is considered an
unsatisfactory situation and should not be allowed to persist for long periods
adaptive adjustment of displacement water remember our primary objectives no
water in the oil no oil losses for improved separation efficiency the
interface should be outside the disk stack to avoid oil losses the interface
should be displaced to near the disk stack before discharge but never into
the disks the adaptive nature of the displacement water makes it possible for
the system to adjust itself to changing process conditions such as increased
water content in the oil or restricted flow of displacement water the number of
pulses at the previous discharge can be seen by stepping the alarm accept button
to position 5 provided the system is not in the
discharge sequence the number of displacement water
is every increased at the tenth discharge discharges which occurred
during the separation sequence parameter 60 parameter 61 parameter 62 are not
counted as part of the accumulation towards the tenth discharge the number
of displacement water pulses is decreased when the following criteria is
fulfilled the trigger point was reached during the addition of displacement
water parameter 70 or during the pauses parameter 71 at the previous discharge
what the controller has determined is that enough displacement water was added
at the previous discharge the total number of pulses will be reduced by one
if the trigger point was reached to discharges in a row then the total
number of pulses will be reduced by two if the trigger point was reached three
discharges in a row then the total number of pulses will be reduced by
three the number of pulses which are added together
without pauses is always two less than the total pulses actually added at the
previous discharge for example if five pulses had been added at the previous
discharge and triggering was not reached then the continuous pulses of this
discharge would be three we will now see the last three steps for other
situations click tenth discharge stopping sequence
this is a sequence of events which safely stops the separator the stopping
sequence is initiated by pressing the second button from the top once the
controller enters the beginning of the discharge sequence this has already been
described unless the discharge sequence is already running the only difference
at this time is that the third led from the top flashes yellow this yellow LED
is steady when the sludge discharge sequence is complete displacement water
is added this timer runs for 70 seconds the recirculation valve has changed
position oil is no longer supply to the separator displacement water is fed into
the bowl it pushes out the oil remaining in the bowl the separator motor is
stopped this time it runs for 180 seconds stop
the heater from the EPC make sure that the oil temperature drops the brake
should be applied once the EPC displays off stop the feed pump at the starter
when the separator has stopped release the brake restart the separator for 20
seconds to empty the bowl of remaining liquid closed system valves as necessary