AUS

Shinko AUS automatic unloading systems havebeen developed to simplify the unloading of cargofrom crude oil tankers and product carriers, andto reduce unloading time.

AUTOMATIC UNLOADING SYSTEM

GENERAL CHARACTERISTICS
1 The anti-cavitation control operation
2 Unloading time can be reduced since the stripping work
can be done by a large capacity cargo pump alone.
3 As stripping work can be performed automatically.
When applying this system to crude oil washing (COW),
4 sludge control can be also performed.

SPECIFICATION
Model
Item

Cargo pump model applied
Separator(m3)

AUTOMATIC UNLOADING SYSTEMAUS 300

AUS 350

AUS 400

AUS 453

AUS 453A

AUS 454

AUS 502

KV 300

KV 350

KV 400KV 450-3

KV 450-3A

KV 450-4

KV 500-2A

1.02

1.38

1.80

3.49

3.49

4.08

4.86

500

550

Discharge control valve
Loading air pressure
Bore

Pneumatic operated, non tight butterfly valve
0.7(MPaG)
(mm)

300

350

400

Vacuum pump

Maximum capacity(Nm3/h/set)

Maximum vacuum(kPa)

Motor(m3)

NSW80 × 2sets

NSW100 × 2sets

320630-73

22kW × 1200min-1 × 2sets

37kW × 1200min-1 × 2sets

0.210.29

Gas extraction valve
Loading air
Bore

Pneumatic operated, reverse action piston valve
0.6~0.7(MPaG)
(mm)

100

Recirculation valve
Loading air
Bore

500

Water ring type

Model

Sealing tank

450

125

Pneumatic operated, reverse action piston valve
0.6~0.7(MPaG)
(mm)

4050

Generally, the AUS 3002, 3502, 4002, 4532, 4532A, 4542 or 5022 are employed in product carriers, and areprovided with one set of a vacuum pump unit for each cargo pump respectively.
And the AUS 4532A/4542 is provided with one set of the NSW 80 vacuum pump unit instead of two sets of theNSW 100 vacuum pump units.
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AUSAUTOMATIC UNLOADING SYSTEMCONTROL SYSTEM

2This system has been installed to implement automatic cargo unloading with only cargo pumps to prevent not
only cavitation but also gas and vapor intake.
The basic operation of this system is described as follows:

When approaching the final unloading stage, the cargo liquid
level in the cargo tank lowers and part of the cargo becomesvapor, which accumulates in the upper portion of the separator,
and the separator level begins to lower.

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After starting the cargo pump, on the cargo control console:(1) The NOR/CLOSE selector, which acts on the gas extraction valve, is set to "NOR".
(2) The control switch, which acts on the vacuum pumps, is set to "AUTO".
(3) The AUTO/MANUAL selector, which acts on the discharge control valve, is set to "AUTO".

When the separator level lowers to 50%, the vacuum pumps
start from an air signal sent from the level transmitter.
At the same time, the gas extraction valve is opened and thedischarge control valve is throttled.
CARGO CONTROL ROOM

PUMP ROOM ENTRANCEELECTRIC CONTROLCIRCUITCARGO CONTROL CONSOLESTRIPPING
FINISH LAMP
LOW LEVEL PRESSURE
SWITCH VACUUM PUMP GASLAMPEXTRACTIONCONTROLVALVE
SWITCHN/C SELECTORSEPARATORLEVEL & VALVEPOSITION GAUGE
A/M
MANUAL
SELECTOR LOADERAIR SETSOLENOID
S VALVEGASEXTRACTIONVALVERECIRCULATIONVALVEGAS EXTRACTION PIPE

Inert gas

EXHAUST PIPE

EXHAUSTVALVES

Signal air 0.02~0.1MPaG

MSTARTERSEALINGWATERTANKMDRAINVALVESignal air 0.02~0.1MPaGELECTRIC
MOTOR

Signal air 0.02~0.1MPaG

VACUUMNON
RETURN PUMP
VALVE

PUMP ROOMDISCHARGE PIPE

ENGINEROOMCARGO TANKSEPARATORVACUUM PUMP UNITLEVELTRANSMITTERSUCTIONVALVE

AIR SETGAS RELEASE
VALVE

Level 70%

SUCTION PIPE

Level 50%

Level 5%Controlair0.7MPaG

POSITIONERVALVEPOSITION
TRANSMITTERBUTTERFLYVALVEACTUATORDISCHARGE CONTROL
VALVE

CARGO
OIL PUMPCARGO LIQUIDSEALING WATERBELLMOUTH

18DRAIN TANKFORMAINTENANCE

5The above-mentioned unloading process is repeated many times so as toprevent the vapor from entering into thecargo pump when the vapor accumulates in the separator.
When the level in the cargo tank lowers
further, a vortex takes place around thesuction bell mouth and gas is taken in.
This gas is separated from the cargo in
the separator, and is accumulated at theupper portion of the separator, which isthe same process as with the vapor.

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UPPER DECKSLOP TANK

When the vapor is extracted by thevacuum pumps, the separator level rises
again.
If the level rises to 70%, the gas extraction valve closes.
And, in 20 seconds, the vacuum pumps
stop and the discharge control valve
opens.

6Controlair
0.7MPaG

LOW
SELECTOR
RELAY

4NON-RETURNVALVESEALING WATER & GAS
COMPRESSED AIR
SIGNAL AIR

If the level in the cargo tank lowers muchfurther, the liquid level around the bellmouth fluctuates heavily and a large
amount of gas is taken in.
The separator level lowers substantiallyeven if the two vacuum pumps continue
to run simultaneously and the discharge
control valve is at a very small opening
degree.
If the separator level reaches 5%, theorange low level lamp on the console
turns on to indicate that the unloading
process has entered into the end of thestripping stage.

8When this condition continues for about
3 minutes, the orange stripping finish
lamp on the console flickers with a buzzing sound, which indicates the completion of the unloading work using thissystem.

ELECTRIC WIRE

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