FRAMO Submerged Cargo Pump

The trade name trauma is located in
Bergen a city in the west coast of norway with long traditions in shipping
and maritime business from all is today the leading supplier of submerged cargo
pumping systems to the world tanker market in year 2000 more than 1400 cargo
tankers equipped with from or cargo pumps a daily crossing the seven seas
and safely and efficiently carry and handle all types of liquefied cargoes in
this video we will highlight correct operation of Rommel cargo pumping
systems during loading discharging stripping and tank cleaning the fram-o
system can also incorporate heating cooling and circulation of the cargo all
up to the owners requirements sequence number one loading the cargo tanks
correct operation of pumps and valves is essential to avoid pressure shocks in
the cargo pipeline system during loading pressure shocks may cause severe damage
to pipelines hoses loading arms and cargo pumps to avoid pressure shocks
start the loading slowly and don’t open or close the cargo valve in the system
too quickly especially where long pipelines and high flow rates are
involved frommel recommend installing a separate cargo drop line to obtain a
satisfactory loading rate and to make it possible to bypass the cargo pump during
loading this is a recommended cargo pipe layout
in the fromel system if bypassing is not possible due to valve arrangement use
the following procedures to avoid pressure peaks in the cargo piping
during loading keep manifold valve closed until the cargo reaches the
manifold open the manifold valve partly to fill cargo line on deck open the
cargo drop line valve and pump discharge valve slowly until you reach maximum
capacity remember maximum loading pressure is 8 bar measured at the top of
the pump continue to load through the drop line and the cargo pump if the ship
is not equipped with a drop line follow the same procedure except for operation
of the drop line valve most ships today have an integrated computer system which
takes care of control and monitoring of all activities within the cargo tank
section such as pump capacity control valve control temperature and alleged
control if the loading has been stopped and the cargo valves are closed it’s
important to restart the loading by following the same procedure as
described earlier finally some small differences in the
loading procedure may apply for a chemical carrier a product carrier OBO
and crude tanker but the main rule is the same all valves which control the
liquid flow should be opened slowly the time taken for the power operated valve
to move from open to shut and from shut to open must be checked regularly at
their normal operating temperatures sequence number 2 discharging of parcel
cargoes start the hydraulic power pack can increase the hydraulic system
pressure if the hydraulic oil temperature is below 20 degrees
centigrade circulate the oil through the heating valve at maximum 100 bar prior
to raising the hydraulics and pressure to approximately 150 bar
start the car go pumped slowly and let it run with hydraulic pressure forty to
fifty bar for approximately one to two minutes with closed cargo pump valve
raise the pumps discharge pressure above manifold pressure to avoid backflow over
pumping and then open the cargo pump discharge valve increase the hydraulic
motor pressure until required this charge pressure or capacity is achieved
if required increase the hydraulic system pressure follow the same
procedure for the next parcel ensure that enough hydraulic power is available
if not the hydraulic pressure will drop and the capacity head will be reduced
the hydraulic system pressure must be slightly above the highest consumer
pressure discharging of homogeneous car goes parallel pumping running
centrifugal pumps in parallel is for example when discharging the same type
of cargo with a number of cargo pumps through a common shoreline with Fram or
cargo pumps this is easy as the frommel system gives the operator maximum
flexibility and stepless speed and capacity control of each individual
cargo pump nevertheless in some cases we’ve seen that small misunderstandings
in the important relationship between the pump speed number of pumps running
Ilitch a number of size of shorelines may delay the discharge drastically for
optimal understanding from all training courses in operation and maintenance are
arranged worldwide all year round by the professional trommel training team and
there’s no doubt the professional training is a good investment for the
ship the ship’s crew and the ship owner the capacity of all centrifugal pumps
Berry’s very much with the head or the pumps back pressure if the head is very
low for example when pumping just over the rail the capacity is very large but
if the head is very high in goes to maximum the pump capacity goes to zero
in order to have a successful discharge of homogeneous cargo try to avoid too
many bends and tee pieces and never use valves and pipe diameters that are too
small start the cargo pump using the same
procedure as for parcel cargoes always start the cargo pumps with the discharge
valve closed raise the cargo pump pressure above the shoreline pressure
before opening the cargo valve to avoid backflow over pumping the hydraulic
system pressure should be maximum 15 bar above the highest consumer pressure
cargo pump in order to minimize energy consumption maintenance and wear and
tear cargo pump capacity should be controlled
by the pump speed and not by throttle in the cargo discharge valve or any other
valve in the cargo piping system this can be achieved easily by keeping all
cargo controllers in maximum position and regulating the main hydraulic system
pressure until required discharge rate is achieved if necessary
each cargo pump must be balanced individually by decreasing or increasing
cargo pump hydraulic pressure generally we recommend to run as many pumps in
parallel as practical at a reduced hydraulic pressure rather than just a
few pumps at maximum hydraulic pressure remember two pumps at a hundred percent
capacity give the same discharge rate as four pumps at 50% capacity the advantage
is reduced hydraulic system pressure reduced speed and sound level and
increased life time however in some cases for example when discharging cargo
with low specific gravity and very long shorelines we may have to run the cargo
pump with full speed to meet the discharge pressure at the rail reduced
the cargo pump hydraulic pressure to approximately a hundred bar at the end
of discharging or when the pump starts to lose suction indicated by vibration
and hydraulic pressure pulsation this is to avoid hunting and dry running of the
cargo pump sequence number three stripping at the end of the discharging
when the cargo tank is nearly empty we’re in the stripping condition to
obtain a best possible stripping result with a minimum wear and tear on the pump
we recommend the following procedure empty the cargo tank it reduced cargo
pump capacity the pump capacity in other words the hydraulic pressure has to be
adjusted according to what type of cargo you’re pumping the cargo specific
gravity and viscosity when the cargo tank is empty close the cargo valve and
stop the pump the best stripping result is obtained with lowest possible back
pressure purge and empty the cargo deck line on this ship the stripping valve
for the cargo pump is remotely operated for easier operation start the cargo
pump locally and increase the pressure to
approximately eighty to a hundred bar open the valve on the stripping line
regulate the air inert gas pressure with the inlet valve and strip the remaining
cargo into the deck line until the cargo tank and cargo pump is empty close the
stripping valve stop the purging and stop the cargo pump repeat the stripping sequence if
necessary to sum it all up we will highlight the four main steps
schematically step one end of the discharging the cargo pump is running at
reduced speed cargo valve and manifold valve are open until the cargo tank is
empty step 2 purging of the cargo deck line when the
cargo tank is empty close the cargo valve and stop the pump empty the cargo
deck line by purging with inert gas close the manifold valve step 3
relieving the pressure in the cargo deck line open the small stripping valves on
cargo Punk deck line to minimize back pressure in the line step 4 stripping
start the cargo pump locally and increase the pressure to approximately
80 to 100 bar connect the air in a gas supply to the cargo pipe and strip out
the cargo through the small stripping pipe purge until the cargo tank and pipe
stack is empty close the stripping valve and stop the pump by following this
procedure you will achieve an excellent stripping results and remember when the
discharge and stripping operation are completed purge the cargos pump
cofferdam sequence number four tank cleaning
to keep a dry tank top and still avoid dry running during tank cleaning the
tank cleaning machines capacity flow into tank and the cargo pumps capacity
flow out a tank must be equal reduce the cargo pomp hydraulic pressure until the
capacities are balanced before tank cleaning is finished closed the pumps
discharge valve and open the stripping valve to allow an increase in water
level run the pump at approximately a hundred and ten bar against the closed
cargo pump discharge valve for one to two minutes to clean the cargo pump
remember to flush the pump and tank with fresh water if sea water has been used
for tank cleaning by following these instructions you will achieve an energy
efficient discharge no pressure shocks during loading and minimal wear and tear
on the cargo pumps during stripping and tank cleaning
in other words lower operation and maintenance costs for the ships as well
as for the owners

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