6.6
Coalescing bed-type oily
water separators
6.6 Coalescing bed-type oily
water separators
? The coalesce is capable of forming oil globules
up to l2 mm diameter and the heavier fuel oils
usually form long 'stalagmites' which grow to a
considerable size before they are released.
Because of the 1ow velocities employed the
collected oil can flow past the water screen
without becoming re-entrained and carried
through into the outlet.
6.6 Coalescing bed-type oily
water separators
? The separators can be arranged for manual or automatic
operation,Four test corks are fitted,two to each zone
with the internal pipes arranged so that the high and low
levels of oil can be monitored.
? When oil reaches the high oil level test cock a manual
discharge valve on the collection zone being monitored is
opened to allow the oil to discharge to the oil collection
tank,The low oil level test cock is then opened and when
water appears the oil discharge valve is closed.
? The separator pressure valve is maintained at 1 bar either
by having a high level overboard discharge or a spring
loaded or manual discharge valve in the clean water outlet.
6.6 Coalescing bed-type oily
water separators
? It is advisable to fit a high capacity basket strainer with a
20 mesh screen between the oily water pump and the
separator to prevent dirt and debris from fouling the
underside of the coalescing bed.
? With a suitable strainer the bed will operate almost
indefinitely without servicing and does not normally
require cleaning by back flushing or renewal but without
adequate filtration the bed is liable to become partially
blocked resulting in a fall-off of effluent quality and a
significant rise in back-pressure,In the event of this
occurring the bed should be backwashed.
6.6 Coalescing bed-type oily
water separators
? This can be done by opening the drain valve in the bottom
of the unit and allowing the contents to run to the bilge.
? For satisfactory operation it is essential that the bed is
well charged with oil at all times; new separators are
supplied with the bed already charged,When operating
the separator for the first time it should be filled with
clean water before use.
6.6 Coalescing bed-type oily
water separators
? The separator is designed so that it is only necessary to
lift the top section 75 mm to gain access to the interior
and for full examination,the top half can be moved
sideways,This facility enables the separator to be
installed between the decks where the headroom is low.
? Steam coils or electric heaters may be fitted to reduce
the specific gravity of the oil to aid collection and
discharge,Drain and steaming out connections are
provided so that the separator can be drained and
steamed out before opening up for survey.
6.6 Coalescing bed-type oily
water separators
? This design of separator produces an effluent
quality of better than 20 mg/litre,Figures of 15
mg/litre with 25% oil concentration and 6
mg/litre with 5% oil concentration have been
recorded during tests on board ship.
? When fitted with a clean water discharge valve
which closes when the oil discharge valves are
open,the separator can function adequately when
handling 100% oil as for instance when the bilge
water has been stripped off and only the oil is left.
Coalescing bed-type oily
water separators
6.6 Coalescing bed-type oily
water separators
? The coalesce is capable of forming oil globules
up to l2 mm diameter and the heavier fuel oils
usually form long 'stalagmites' which grow to a
considerable size before they are released.
Because of the 1ow velocities employed the
collected oil can flow past the water screen
without becoming re-entrained and carried
through into the outlet.
6.6 Coalescing bed-type oily
water separators
? The separators can be arranged for manual or automatic
operation,Four test corks are fitted,two to each zone
with the internal pipes arranged so that the high and low
levels of oil can be monitored.
? When oil reaches the high oil level test cock a manual
discharge valve on the collection zone being monitored is
opened to allow the oil to discharge to the oil collection
tank,The low oil level test cock is then opened and when
water appears the oil discharge valve is closed.
? The separator pressure valve is maintained at 1 bar either
by having a high level overboard discharge or a spring
loaded or manual discharge valve in the clean water outlet.
6.6 Coalescing bed-type oily
water separators
? It is advisable to fit a high capacity basket strainer with a
20 mesh screen between the oily water pump and the
separator to prevent dirt and debris from fouling the
underside of the coalescing bed.
? With a suitable strainer the bed will operate almost
indefinitely without servicing and does not normally
require cleaning by back flushing or renewal but without
adequate filtration the bed is liable to become partially
blocked resulting in a fall-off of effluent quality and a
significant rise in back-pressure,In the event of this
occurring the bed should be backwashed.
6.6 Coalescing bed-type oily
water separators
? This can be done by opening the drain valve in the bottom
of the unit and allowing the contents to run to the bilge.
? For satisfactory operation it is essential that the bed is
well charged with oil at all times; new separators are
supplied with the bed already charged,When operating
the separator for the first time it should be filled with
clean water before use.
6.6 Coalescing bed-type oily
water separators
? The separator is designed so that it is only necessary to
lift the top section 75 mm to gain access to the interior
and for full examination,the top half can be moved
sideways,This facility enables the separator to be
installed between the decks where the headroom is low.
? Steam coils or electric heaters may be fitted to reduce
the specific gravity of the oil to aid collection and
discharge,Drain and steaming out connections are
provided so that the separator can be drained and
steamed out before opening up for survey.
6.6 Coalescing bed-type oily
water separators
? This design of separator produces an effluent
quality of better than 20 mg/litre,Figures of 15
mg/litre with 25% oil concentration and 6
mg/litre with 5% oil concentration have been
recorded during tests on board ship.
? When fitted with a clean water discharge valve
which closes when the oil discharge valves are
open,the separator can function adequately when
handling 100% oil as for instance when the bilge
water has been stripped off and only the oil is left.
