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1. General

Steam consumption is calculated under the following operational conditions

1) Sea going

2) Cargo oil tank heating

3) Maneuvering

4) Cargo unloading

5) In-port

6) Cargo oil tank cleaning

 

2. Design criteria

1) Environmental data

 

Environmental condition Winter (C) I.S.O. ((C)
Atmosphere -10
Sea water
Ballast water
Pump room
Engine room

 

 

2) Temperature in tank

F.O. tank
HFO settling tank
HFO service tank
Cargo oil tank
Slop tank

 

3) Heating-up temperature and time

 

Tank Winter Heating-up time
F.O. tank Cargo oil tank Slop tank From5C to 45C From 44 C to 66C From 44 C to 66C 96 Hours 96 Hours 24 Hours

 

4) Available enthalpy

 

Heating method Application 7 kg/cm2g (kcal/kg) 9 kg/cm2g (kcal/kg)
Heater Tank 490 540 *573 **543

* For the tank cleaning heater

** For the cargo and slop tank heating

 

5) Specific gravity and specific heat

 

Fluid Specific gravity Specific heat
    (kcal/kg C)
Sea water 1.025 0.94
Fresh water 1.000 1.00
H.F.O. 0.980 0.45
L.O. 0.900 0.45
Cargo oil 0.850 0.45

For the calculation of cargo oil tank heating


 

 

3. Main components

1) Steam generating plant

  Oil fired boiler Exhaust gas economizer
Type Vertical water tube Forced circulation
No. of sets
Evaporation x Pressure (kg/h x kg/cm2g) 25,000x16/7 1,500x7
Design Condition - NCR load of M/E and I.S.O. reference conditions

 

2) Main engine and Gen. engine

 

  Main engine Gen. engine
Type B&W 5S70MC-C 4-Stroke
No. of sets
MCR ( x rpm) 21,100x91.0 1,090x720
NCR ( x rpm) 18,990x87.9 -

 

3) Heater

 

Description Set Flow rate (m3/h) In/out temperature (C)
M/E F.O. heater 6.9 100.0/150.0
G/E F.O. heater 1.5 100.0/150.0
A/B F.O. heater 4.3 55.0/145.0
H.F.O. purifier heater . 3.6 60.0/98.0
L.O. purifier heater 2.4 45.0/98.0
Tank cleaning water heater 180.0 20.0/80.0
Calorifier 1.0 10.0/70.0

 

4) Steam driven pump

 

Description Set Capacity (m3/h x mTH) Type Steam consumption (kg/h)
Cargo oil pump 3,000x125 Vertical centrifugal with 1-stage steam turbine 13,268
Cargo stripping pump 200x125 Reciprocating 2,910

Proj. No. : H.5230       STEAM CONSUMPTION CALCULATION              
Date: Feb.27, 2003               WINTER CONDITION                    
DESCRIPTION   DESIGN     SEAGOING TANK HEATING MANEUVERING UNLOADING IN-PORT TANK CLEANING
  NO EACH CAPACITY P AMOUNT NO % STM NO % STM NO % STM NO % STM NO % STM NO % STM
M/E F.O. Heater 6.9m3/h (100/150 C)
G/E F.O. Heater 1.5m3/h (100/150 C)
HFO Purifier Heater 3.6 m3/h ( 60/ 98 C)
A/B FO Heater 4.3m3/h ( 55/145 C)
LO Purifier Heater 2.4 m3/h ( 45/ 98 C)
Boiler warm-up For Stand-By Boiler
A/B Burner Atomizing Steam Atomizing
HFO Sett. Tank 72.6 m3 60 C Keeping
HFO Serv. Tank 72.6 m3 85 C Keeping
Others Misc. equipment/tanks
COP Turbine 3000 m3/h x125m 13,268 39,804 13,268
CO Stripping Pump 200m3/h x125m 2,910
Air Ejector For Vacuum Condenser
Cargo Oil Tank 127315 m3 (44/66C/96H) 28,088   28,088
    127315 m3 66C Keeping 10,040   ■o 10,040
Slop Tank 1350.3 m3 ( 44/66 C/24H) 1,583 3,166
  1350.3 m3 66 C Keeping
T.C. Heater 180m3/h (20/80 C) 18,160 18,160
Ballast & FW Tanks 1 0 CKeeping 4,568 0 0 0 0 0 0 0 0 0 0 1 100 4,568 1 100 4,568
No.1 H.F.O. Tank(S) 825.3 m3 (5/45C/96H) 370
  825.3 m3 45 C Keeping
No.2H.F.O. Tank(S) 996.9 m3 (5/45C/96H)
  996.9 m3 45 C Keeping
No.1 H.F.O. Tank(P) 733.3 m3 (5/45C/96H)
  733.3 m3 45 C Keeping
No.2 H.F.O. Tank(P) 909.0 m3 (5/45C/96H) 414
  909.0 m3 45 C Keeping
Accomm. Heating 100%Capa. (-30/20C)
Calorifier   1.0m3/h ( 10/70C)
Sub Total             1,696     33,283     12,084     41,859     5,939     38,627
Pipe loss & margin( 5%                 1,664         2,093         1,931

 





Date: 2015-12-11; view: 99


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