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Chapter 1

Work during Outward Voyage

§§§§ Work during outward voyage

The work mentioned below should be performed in principle, during the outward voyage. Note

however, that some of the tasks below may not be limited only to the outward voyage and should be

judged according to the conditions.

1. Disposal of oil remaining in the cargo tanks (P.1-2 to P.1-4)

Generally, the Dry Certificate is obtained after discharging is completed and after the dryness in the

cargo tanks is confirmed. Usually, the remaining oil in the lines used for final discharge is drained to

3P or 3S. With the passage of time, some oil does remain in the tanks because of phenomena such as

rise in temperature within the tanks or dissolution of sludge. This oil should be monitored by sounding.

The oil remaining in the cargo tanks should be stripped in order to avoid unnecessary problems at the

loading port. Tank stripping requires about three to five hours.

2. Disposal of AUS tank drains (P.1-5)

During discharging of cargo, especially cargo with high vapor pressure using AUS, a large amount of

gas is expelled to the seal water tank of the vacuum pump. The liquid that overflows (fresh water or

crude oil) is stored in the drain tank. This tank should be cleaned.

3. Functional test of ODM (P1-6 to P1-14)

Two types of ODM are available: one manufactured by Heishin Pump Co., Ltd. and the other by

Sumitomo Precision Products Co., Ltd. ODM cannot be used as long as tank cleaning has not been carried out using sea water during

inspections/repairs and dry-docking. However, this monitor should be checked to confirm that it works

satisfactorily at all times. For this purpose, functional tests at sea should be conducted.

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1. Disposal of oil remaining in cargo tanks

1.1 Objectives of disposal of remaining oil

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Oil remaining in the cargo tanks should be disposed of before the ship reaches the loading port so as to

maintain conditions conducive to loading cargo. Disposal of the remaining oil before loading is a

standing instruction from the charterer. The Dry Certificate is obtained at the discharging port during normal voyages of SBT ships, which

means that no oil exists in cargo tanks, pipelines and pumps if the dry condition is maintained. In

practice however, oil in lines used for final discharge is drained to 3P or 3S and with the passage of

time, a small quantity of oil exists because of phenomena such as rise in temperature within cargo tanks

or dissolution of oil in sludge. This remaining oil is monitored by sounding. The oil remaining in the

cargo tanks is to be stripped in order to avoid unnecessary problems at the loading port.

1.2 Area for disposal of oil remaining in tanks

The capacity of the stripping pump is small moreover, ship motions make the stripping work difficult,

therefore this work is generally performed in an area where the sea conditions are calm.

1.3 Equipment for disposal of oil remaining in tanks

Equipment that can be used for stripping the cargo tanks when the ship is underway are as given below.

1) Stripping pump 2) Vacuum pump in AUS-equipped ships

1.4 Preparations for disposal of oil remaining in tanks

Preparations mentioned below should be made before disposing of the oil remaining in tanks.

1) Perform sounding of all the tanks and determine the quantity of oil (OBQ) remaining in each tank. 2) Notify the Engine Department beforehand to make preparations to run the stripping pump. 3) If necessary, adjust the trim and list (heel) using ballast. Adjust the list so that the ship heels slightly toward the side where the bell mouth is installed. 4) Station personnel in the pump room and make preparations to start the stripping pump or vacuum

pump.

1.5 Procedure for disposing of the remaining liquid

The stripping pump is generally used to shift the remaining oil to the slop tank. The procedure for

doing so is described below.

1.5.1 Stripping the remaining oil

(Refer to "Fig. N-1-1 Line Diagram" on P2-46, "Fig. N-1-2 Line Diagram" on P2-47 and "Fig.

N-1-3 Line Diagram" on P2-48 all in the "Documents Section.") The procedure for stripping the remaining oil is described below. However, when cargo with high vapor pressure has been finally discharged, care is necessary to ensure

that negative pressure does not build up when the stripping pump is operated.

1) Perform valve lineup. Strip the oil remaining in the tanks and pump it in the tank main line by the method given below.

An example of sea area where such work can be performed in a short time is the area after passing the ONE

FATHOM BANK of the Malacca Strait

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a) Open valves V180, V161 and V164 to fill oil in the stripping pump. The oil remaining in the MARPOL line used during the final discharge should be used for this

purpose.

Eductor-associated valves V180, V161, V164 Open

b) Confirm that V165, V166, V141 and V142 are fully closed.

Valves associated with the stripping line V165, V166, V141, V142 Confirm fully closed

c) Open V168, V167 and V183 (port side slop tank).

Valves associated with the stripping line V168, V167, V183 Open

d) Perform valve lineup in this sequence: V 180→V161→V164→V168→V167→V183 V180 is the suction valve of the stripping pump and is also connected to V167 and V183 on the

discharge side. The No. 1 eductor is at the bottom of the pump room. The discharge line to the slop tank through

V183 is at a high location at the intermediate stage of discharge line for the eductor driving oil in the

pump room. If suction pressure of the stripping pump is risen, the oil transferred through V183 may

lead to suction line of the stripping pump through V180. 2) Start the stripping pump. 3) If the stripping pump works normally, close V180.

Eductor suction valve V180 Close

Negative pressure occurs at the suction of the stripping pump.

4) Open V141.

Valves associated with the stripping line V141 Open

Gas enters the stripping pump and the stroke rises abruptly.

5) Fully close V141.

Valves associated with the stripping line V141 Fully closed

6) Deliver oil to the stripping pump by opening V180 and prime it again.

Eductor suction valve V180 Open

7) When the stripping pump operation is restored, fully close V180 and again open V141.

Eductor-associated valves V180 Fully closed

Valves associated with the stripping line V141 Open Negative pressure gradually builds up in the tank stripping line, but in a short while, gas enters the line.

8) If the operations in 4) to 7) are repeated two or more times, the pressure in the tank stripping line

drops below -26 kPa (about -200 mmHg). When this condition occurs, open the tank stripping valve of the tank with the most big quantity of

remaining oil (generally 3P or 3S), and start stripping. 9) When gas enters the suction line, the stripping of the tank is completed. However, in ships with no

well equipped below the bell mouth, shall repeat the procedure after 4) and perform actual

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measurements to confirm that the tank is dry. Continue with the procedure mentioned above to obtain negative pressure in the tank stripping line,

and strip the oil remaining in other tanks. When the disposal of the remaining oil is completed, perform sounding of all the cargo tanks and

determine the OBQ. If necessary, perform sounding of tanks scheduled to be loaded before starting

the loading operation and calculate the OBQ. Deduct this quantity from the loadable quantity and try

to calculate the actual loadable quantity of the ship accurately.

1.5.2 Disposal of gathered oil (Refer to "Fig. N-1-4 Line Diagram" on P2-49 of the "Documents

Section.") Two methods are available to dispose of the oil gathered in the port side slop tank.

1) Method of pumping the oil in the tank main line 2) Method of pumping the oil in the pump delivery line

The sequence of valve lineup for the method of pumping oil in the tank main line is as given below. Port side slop tank � V162 � V164� stripping pump � V168 � V167 � V180 � V180 � V188

� V187 � No. 3 tank main line � gas flow V313 � V333 � V388 � V389 � 3C.

1.5.3 Precautions when disposing of the gathered oil

The precautions mentioned below are to be taken when disposing of the gathered oil.

1) The functional test of the valve should be carried out before pumping the oil into the line. At least

the testing of valve in the line into which the oil will enter should be performed beforehand. 2) Generally one line is enough for disposal of gathered oil but other lines may be used without any

problems. The number of lines should be selected after studying the quantity of remaining oil.

1.6 Controlling liquid-sealed condition after disposing of the remaining oil

Management for the pumping oil into the tank main line should be considered with following points.

1) The liquid-sealed condition may be controlled until the start of loading in the method of pumping

oil into the tank main line. . 2) All cargo valves are to be performed functional test untill before loading cargo.However, it is

impossible if the method of pumping oil into the pump discharge line. There is merit for the method

of pumping oil into the pump discharge line, so that It is not necessary to test valves where delivery

side of the pump untill loading However, in this method, if no action is taken until the line pressure test on the homeward voyage, oil

remains in the line and the liquid-sealed condition occurs.

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2. Disposal of drain in the AUS drain tank

2.1 Procedure for disposal of drain in the seal water tank

The gas and seal water discharged from the vacuum pump are segregated in the AUS seal water tank.

Seal water tank have function of seal from slop tank which is discharged gas from vaccum pump

through the seal water tank and have also function of storage seal water which is used for vaccum

pump activity. To maintain the proper activity of the seal water tank, the water level should be

maintained properly and should be supplied it if necessary.Thus, the storage of seal water is an

important tank for vacuum pump operation. During discharging of cargo , seal water tank becomes

contaminated not only with gas but also with crude oil that has liquefied. The sight glass of the level gauge should be cleaned since it may become dirty from crude oil and the

gauge may not be visible. The contamination in seal water tank is conspicuousness in discharging of

high vapour pressure cargo. Adequate care should be taken against contamination with hydrogen

sulfide gas, as in the case of Qatar Land. The draining of water from the seal water tank, its cleaning

and restoration should be performed according to the procedure given below.

1) Close the stop valve in the line from the seal water tank to the slop tank. 2) Close the suction valve of the vacuum pump. 3) Open the drain valve of the seal water tank and drain the liquid to the drain tank. To drain water from the U-shaped seal pipe, open the drain valve of the U-shaped seal pipe in parallel

with the draining out of water from the seal water tank. 4) Open up the seal water tank. Take adequate care against gas in the tank and leak in the stop valve in the line to the slop tank. Take

precautions to avoid inhaling gas until safety in the seal water tank has been confirmed. 5) Remove the sight glass of the level gauge and clean it. 6) After cleaning the level gauge, close up and restore the original condition of the seal water tank. 7) Close the drain valve of the seal water tank. 8) Open the suction valve of the vacuum pump. 9) Fill fresh water in the seal water tank. 10) Open the stop valve in the line to the slop tank. Feed water to the seal water tank until the normal

level is reached. 11) Confirm that the level of the seal water tank is normal. When the level in the seal water tank is normal, water should be fed such that it overflows to the drain

line. The overflowed water ensures that the U-shaped seal is satisfactory.

2.2. Disposal of drain in the drain tank

1) During discharging, the oily water drained to the drain tank should be returned to the slop tank

using the stripping pump. 2) An air vent that opens to the atmosphere is provided in the drain tank. However, depending on the

ship, the vent may be connected to the slop tank in which case the gas in the tank cannot be

discharged to the atmosphere. 3) Return the oily water in the drain tank to the slop tank by operating the stripping pump. Do not dispose drain in the drain tank such as correct any drum directly from drain valve fitted on the

tank.

4) Guard against inhaling gases in the tank when inspecting the tank with opening the manhole.

In the past, there have been instances of accidents to workers when toxic gas in crude oil was inhaled during

this work.

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3. Functional test of ODM (Oil Discharging Monitor)

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3.1 Timing for implementing the functional test of ODM

The functional test of ODM should be implemented during every ballasted voyage.

3.2 Functional test of ODM manufactured by Heishin Pump Co., Ltd.

(see Fig. N-1-1 and Fig. N-1-2)

3.2.1 Preparations

1) Start the hydraulic oil pump. 2) Switch on the power to the computer unit in the cargo control room. 3) Open the air supply valve of the valve control unit in the engine room. Set the pressure of regulator

in the valve control unit at 5 kg/cm2 , or confirm this setting.

4) Confirm that the Manual Override switch (switch with key) of the computer unit is OFF (vertical).

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Fig. N-1-1 System diagram of ODM (made by Heishin Pump Co., Ltd/ JOWA)

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Fig. N-1-2 Control panel of ODM (made by JOWA)

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3.2.2 Operating procedure Headline Display

Press the "PG DN" key three times. Page flow and speed display

Press the “↓ ” key once.

Set the maximum flow rate at 1200 m3/h

tentatively. After pressing "INS," enter

1200 while holding down "ALT." Finally,

press "RET" to confirm the operation.

Enter numbers in a similar manner. Press the "PG UP" key two times.

Page programming display

Press the “↓ ” key four times.

Set the flow rate at 1000 m

3/h, and change

over from "AUTO" to "MAN" by

pressing "STEP."

Press the “↓ ” key once.

Set the ship speed at 10 knots, and change

over from "AUTO" to "MAN" by

pressing "STEP."

Press the "PG UP" key once. Press the “↓ ” key once.

Set the oil concentration at 0 ppm, and

change over from "AUTO" to "MAN" by

pressing "STEP."

Confirm that the overboard discharge valve is closed, press the "OBV" key and start the ODM.

Press the “↑ ” key once.

Check the data and confirm that the

overboard discharge valve has opened

automatically.

Press the “↓ ” key once.

Set the oil concentration at 200.0 ppm.

Press the “↑ ” key once.

Check the data and confirm that the

Oc(AUTO) Flow(AUTO) Oildis Speed(MAN) .0000ppm

Flow max limit = 3000.m3/h Min limit = 100.0 m3/h delay 10(05)s

Flow is: (AUTO). Change with STEP Manual flow = 1000 m3/h (780.7 m3/h)

Flow is: (AUTO). Change with STEP Manual Speed = 10.00 n (0.00)

OILCONC is: (AUTO). Change with STEP

Oc(MAN) Flow(MAN) Oildis Speed(MAN)

OILCONC is: (MAN). Change with STEP Manual conc ＝ 200.0ppm（.0000ppm）

Oc(MAN) Flow(MAN) Oildis Speed(MAN) 200ppm 1000m2/h 20.1/nm 10.0n

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overboard discharge valve is open.

Press the “↓ ” key once.

Set the oil concentration at 301.0 ppm.

Press the “↑ ” key once.

Check the data and confirm that the alarm

is activated and the overboard discharge

valve has closed automatically. Press

"RESET" and stop the buzzer.

Again set the oil concentration at 200 ppm, and confirm that the overboard discharge valve opens

automatically.

Press the "OBV" key and confirm that the overboard discharge valve closes automatically. TEST

complete.

3.2.3 Procedure for completion of the test

1) Change over flow rate, ship side, oil concentration from "MAN" to "AUTO." 2) Turn ON the Manual Override switch (sideways) and close the recirculation valve to the slop tank.

3) Close the air supply valve of the valve control unit in the engine room. 4) Switch off the power to the computer unit in the cargo control room. 5) Stop the hydraulic oil pump.

3.3 Functional test of ODM manufactured by Sumitomo Precision Products

(see Fig. N-1-3 and Fig. N-1-4)

3.3.1 Functional test of CCU unit

1) Objectives of the functional test of the CCU unit Perform a simulated start of the ODM control unit. Input a signal such that the instantaneous

discharge rate of oil exceeds 30 liters/mile, and confirm the changeover from overboard discharge

valve to slop tank recirculation valve (hereafter called recirculation valve). 2) Preparations for functional test Make the settings below in the ODM Control Unit (CCU) of the CCR.

(1) Flow rate: 2,000 m3

(2) PPM: 240 (3) Ship speed: 16.0 knots

3) Procedure a) Confirm that the CCU control switch (switch with key) is at the Manual Override position. b) Enter the flow rate Enter E 3 4 E using the keyboard and then press the A/M switch and switch over to manual input.

Then enter 2,000 and press E. c) Enter the PPM Enter E 3 5 E using the keyboard and then press the A/M switch and switch over to manual input.

Then enter 240 and press E. d) Enter the ship speed Enter E 3 6 E using the keyboard and then press the A/M switch and switch over to manual input.

Then enter 16.0 and press E.

OILCONC is: (MAN). Change with STEP Manual conc ＝ 301.0ppm（.0000ppm）

Oc(MAN) Flow(MAN) Oildis Speed(MAN) 301ppm 1000 m3/h 30. l/nm 10.0n l/h 10.0n

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e) Set the CCU control switch at AUTO. The printer outputs the result. After a while, the overboard

discharge valve opens and the recirculation valve closes. f) Enter numerical values by any of the methods b), c), or d mentioned above such that the

instantaneous discharge rate of oil exceeds 30 liters/mile. (Example: Flow rate 2,500 m3; oil

concentration 500 ppm, ship speed 10 knots) g) The printer produces an output that 30 liters/nm has been exceeded simultaneously with the

sounding of the alarm. The overboard discharge valve closes and the recirculation valve opens. h) Restore the values changed in f) to the original values. i) The printer produces result that 30 liters/mile has not been exceeded. A little while later, the

overboard discharge valve opens and the recirculation valve closes. The normal overboard

discharge condition is restored. j) During the simulation of the CCU, conform that various data at intervals not exceeding 10 minutes

is printed out. k) After the test ends, set the various data to "AUTO" using the methods (2), (3) and (4) above.

(After entering the key code, press A/M and change over.) 1) When you restore the CCU control switch to the Manual Override position, the overboard

discharge valve automatically closes. Close the recirculation valve using the valve open/shut

switch on the console.

3.3.2 Functional test of oil concentration meter and line washing

1) Objectives of functional test of oil concentration meter Pass fresh water in the supply line of the oil concentration meter and operate it. Pass fresh water

through the gauge to be tested, the sampling pipe, skid, and line to the slop tank and remove traces of

oil and accumulated residues in the line. 2) Preparations for functional test Confirm that the overboard line is empty. (Drain it out during the discharging work.) Make all

preparations for normal operation except the valves associated with the orifice of the flow meter. a) Engine room (1) Turn on the switch on the interface cabinet. (2) Adjust the air pressure in the regulator unit to 3.0 bar. (3) Check the level in the grease cup of the sampling pump motor. b) Pump room (1) Open the sampling intake valve in the pump room and confirm that the drain cock is closed. (2) Keep ready the fresh water hose from the deck to the sampling intake valve in the pump room.

Connect to the drain cock of the sampling intake valve. (3) Remove the blind plate in the line that discharges the sampled water on deck to the slop tank.

(Flushing water made to flow out on the deck.) (4) Open the valves for supply of fresh water for backward flushing around the oil concentration

meter, at the sampling entrance and sampling exit. c)CCR (1) Set "SELECT OIL" of the oil concentration meter at 0. (2) Set the "OIL LEVEL" at 995. (3) Set the "SAMPLE VALVE" switch at 1.

3) Procedure a) Set the MODE switch of the oil concentration meter in the CCR at ON. Backward Flush (for 2

minutes) and Forward Flush (for 2 minutes) starts in the skid. (The System Flush lamp lights up

steadily.) b) The flushing water for Backward Flushing of the system enters the overboard line. c) When Backward Flush, Forward Flush, Window Flush and zero adjustment are completed (lamps

for System Flush, Zero Check and Window Flush light up steadily, sampling pump stops), close

the sampling intake valve, open the drain cock and supply the sampling line fresh water. d) Press the "READ OIL LEVEL" switch on the oil concentration meter. The usual oil concentration

measurement starts. e) When this measurement starts, confirm that the oil concentration meter shows the concentration to

be between 0 and an adequately low value. f) Check the sampling water in the discharge line of the slop tank on deck. If it is dirty, continue

measuring the concentration until it becomes clean.

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g) Press the "WINDOW WASH" button several times and clean the internal parts of the window

wash pump also. h) When line washing is completed, press the "READ OIL LEVEL" switch and finish the

concentration measurement. Open the sampling intake valve, close the supply of fresh water and

close the drain cock. Backward Flush, Forward Flush and Window Flush are implemented

automatically. i) Set the "MODE" switch of the oil concentration meter at "STD BY." j) Close all the valve in the pump room that have been opened. k) Turn off the interface cabinet switch in the engine room.

4) Precautions If the CCU unit functional test (test for checking the opening/closing of overboard discharge valve

and recirculation valve by manual input of the signal) is carried out in parallel, it should be performed

after finishing the functional test for oil concentration and after line washing is completed.

3.4 Recording the results

After completing the functional test of ODM, the results of the test should be entered in the "O

column" of the Oil Record Book. The recording sheets for ODM should not be torn out after each test

is completed.

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Fig. N-1-3 System diagram of ODM (made by Sumitomo Precision Products)

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Fig. N-1-4 Control panel of ODM (made by Sumitomo Precision Products)

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Diagram Title Page

N-1-1 Stripping (1/3) 2-16

N-1-2 Stripping (2/3) 2-17

N-1-3 Stripping (3/3) 2-18

N-1-4 Disposal of gathered oil 2-19

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