MISSION™ OC BOILER SD9210#02.

MISSION™ OC boiler

1 Description
The MISSION™ OC boiler is a combined oil and exhaust gas fired vertical marine
boiler, insulated and assembled as a unit with the boiler mountings mounted on the
boiler body.
The boiler mountings are mainly mounted on top of the boiler body in order to allow
a simple connection to the piping systems on board the ship.
The burner is ready for mounting in the furnace and connection of pre-marked
electric wiring.
The control system supplied with the MISSION™ OC boiler unit provides fully
automatic operation of the boiler and burner.

1.1 Boiler pressure part

The pressure part of the MISSION™ OC boiler is shown in Figure 1. The combined
oil fired and exhaust gas fired boiler is designed as a vertical boiler with a
cylindrical shell surrounding the oil fired and the exhaust gas fired sections. The oil
fired section comprises the cylindrical furnace, the steam space, and the convection
section consisting of pin tube elements. The exhaust gas fired section comprises the
stay tubes and smoke tubes.
The pressure part is made of mild carbon steel with elevated temperature properties.
This means that stress concentrations in corner welding are minimised by the design
of the cylindrical shell with the flat endplates of equal thickness.
The cylindrical shell with the two flat endplates welded on is supported by the stay
tubes, the pin-tube elements, and the furnace. Also the steam drum is a cylindrical
vessel welded on the top plate and upper tube plate. The drum acts as a dividing
plate to the exhaust gas fired section. This unique design ensures that no supports
are required.
The pin tube elements consist of an outer tube enclosing the pin tube. The pin tube is
a plain seamless steel tube provided with an inlet pipe at the bottom and an outlet
pipe at the top. A large number of pins are welded around the outside of the tube
creating an extended heating surface. This extended heating surface transfers heat
from the flue gas to the steam/water mixture in the pin tube.
The tubes in the exhaust gas fired section consist of a small number of stay tubes
and a large number of smoke tubes. The stay tubes with an increased diameter act as
support for the boiler. Both types are welded onto the endplates.
The furnace is cylindrical with two flat plates. The bottom steel plate is protected
from radiation of heat by refractory. Furthermore, the furnace bottom is provided
with a socket for drain of washing water.
For inside inspection, the MISSION™ OC boiler is arranged with both hand holes
and manholes. Two manholes are arranged on the boiler shell for convenient access
both into the oil fired section and into the exhaust gas fired section. For visual check
of the smoke tubes, a number of hand holes are arranged in a suitable distance at the

Language UK Page 1/3

 MISSION™ OC BOILER SD9210#02.2

bottom of the boiler drum. For inspection of the flue gas side, inspection doors are
arranged on the flue gas inlet and outlet chamber.
The boiler mountings such as safety valves, steam outlet valve, water level
electrodes, etc. are mainly mounted on top of the boiler body in order to allow
simple connection to the piping system on board the ship. Furthermore, inlet and
outlet boxes are included in the delivery.
Boilers with a diameter up to 3,000 mm are prepared for tack welding along the
boiler shell. For boilers with a diameter above 3,000 mm, the boiler foundation is
arranged as a flanged type which reduces the thermal mechanical stresses to a
minimum during operation. The counter flange is included and ready for welding to
the deck. In both cases, vent holes in suitable numbers are arranged to ensure the
circulation of air below the boiler.
The boiler is prepared for mounting of a compact silencer to suit any type of engine.
The optimal silencer dimensions suitable for each installation should be calculated
on basis of the data for the engine, exhaust gas system, and level of sound
absorption.

Principle drawing of the MISSION™ OC boiler

Stay tubes Smoke tubes Upper tube plate

Pin-tube
Inspection door
Steam drum
End plate Smoke/stay tubes
(top plate)
Pin-tube

Boiler drum

Outer tube
Manhole
Furnace

Fire hole
Hand hole

End plate Refractory

Inspection door

Foundation

Figure 1 Oc1a.cdr

1.2 Heat transfer and water circulation

Oil ignition and combustion take place in the furnace. The produced heat is
transferred mainly by radiation from the flame to the furnace shell. Leaving the
furnace, the flue gases enter the vertical uptakes where heat is transferred to the pin-
tube elements mainly by convection.
In the exhaust gas fired section, heat from the engine exhaust gas is transferred to
the water side by convection.

Language UK Page 2/3

 MISSION™ OC BOILER SD9210#02.2

On the water side, the heat is transferred by evaporation of the saturated water
adjacent to the furnace shell or tube wall (smoke- and pin tubes) where steam
bubbles are formed. As the steam bubbles have a much lower specific density than
the water, they will rise rapidly to the steam space where water and steam are
separated.
The natural circulation in the pin-tube element occurs because the density of water is
higher than the density of steam. The density of the water outside the pin-tube
element is higher than the steam/water mixture inside the pin tube element. The
difference in the static pressure at the bottom connection to the pin tube creates the
driving force for the circulation. The steam/water mixture is discharged into the
steam space where the heavier water particles separate from the steam and flow back
into the water.
The oil fired section of the boiler is designed so that approximately half of the steam
is generated in the pin-tube elements and the rest by radiation in the furnace.

1.3 Steam space

The steam space in the oil fired boiler is designed to absorb the shrink and swell
volumes. It is advisable, however, to avoid sudden and large load variations as this
might create instability in the steam system, and cause level alarms.

Language UK Page 3/3

 TABLE OF CONTENTS

Table of contents

Flow diagrams
Steam/water system ................................................................................... X01:045236
List of parts for steam/water flow diagram ............................................... X01:045236
Oil system .............................................................................................. 94X02:045237
List of parts for oil system ..................................................................... 94X02:045237
Burner unit............................................................................................. 94X02:041966
List of parts for burner unit flow diagram ............................................. 94X02:041966

Language UK Page 1/1

 LIST OF PARTS - FUEL OIL SUPPLY Configuration: 101052–1

List of parts - fuel oil supply

Boiler plant: .............................................................................................................. 1 x MISSION™ OC
Request No.: .................................................................................................................................. 101052
Configuration No.:................................................................................................................................... 1
Hull No./Nos.:YZJ2006-757, YZJ2006-758, YZJ2006-759, YZJ2006-760, YZJ2006-761, YZJ2006-762
Project No./Nos.: ........................................................................................................................... 101052
P&I Diagram drawing No.: ............................................................................................... 94X02:045237
P&I Diagram revision: ............................................................................................................................. c
Date: ..................................................................................................................................... 07 JAN 2008

Reading guide:
List of Parts reflects parts delivered by Aalborg Industries.

Pressure jet burner

Tag No. DimQty. Application Type AI Datasheet or
(DN) supply Drawing
Pressure Jet Burner
F1 1 N/A Pressure Jet Burner R14M Yes 5561 000012
F113 1 N/A Flexible hose - Yes -
F115 1 N/A Flexible hose - Yes -
F236 1 N/A Pressure control unit with quick close - Yes -
valves
Gauge Board
C30 1 N/A Gauge board Yes -
C331 1 1/2'' Instrument stop valve - Yes 254 1002
C431 2 1/2'' Instrument stop valve - Yes 254 1002
C33 1 0-16 Pressure gauge - Yes 663 2973
C35 1 0-10 Pressure switch, max. steam - Yes 613 0300
C48 1 0-10 Pressure transmitter - Yes 8010 000012
Change over valves
G115 1 25 Three-way valve (incl. micro switch) - Yes B:3063.0 / 6070
000038
Fuel oil supply pump
G147 1 25/20 Fuel oil supply pump - Yes 9294 002087
G224 1 N/A Common remote start/stop box - Yes 8001 002002
Oil Flowmeter
G340 1 20 Oil flowmeter - Yes 71Z20:044014
Boiler control panel
L1 1 N/A Boiler control panel - Yes 63X03:047481

Configuration system release 6.1.16 Page 1/1

 LIST OF PARTS – KBO BURNER Configuration: 101052–1

List of parts - KBO-E burner

Boiler plant: .............................................................................................................. 1 x MISSION™ OC
Request No.: .................................................................................................................................. 101052
Configuration No.:................................................................................................................................... 1
Hull No./Nos.:YZJ2006-757, YZJ2006-758, YZJ2006-759, YZJ2006-760, YZJ2006-761, YZJ2006-762
Project No./Nos.: ........................................................................................................................... 101052
P&I Diagram drawing No.: ............................................................................................... 94X02:041966
P&I Diagram revision: ..............................................................................................................................
Date: ..................................................................................................................................... 31 May 2010

Reading guide:
List of Parts reflects parts delivered by Aalborg Industries.
Tag No. Qty. Dim (DN) Application Type AI Datasheet or
supply Drawing
Pressure Atomizing Burner (Qty. gives the number of parts per burner)
F32 1 N/A Flame scanner - Yes 663 9045
F33 1 N/A Flame scanner - Yes 663 9045
F120 1 L=500 Hose for sealing air - Yes -
F166 1 N/A Ignition transformer - Yes 663 9100
1 X 230V
F182 1 N/A Orifice - Yes -
F183 1 N/A Junction box - Yes -

F201 1 N/A Solenoid valve, N.O. - Yes -

1 X 230V
F202 1 N/A Solenoid valve, N.C. - Yes -
1 X 230V
F203 1 N/A Solenoid valve, N.O. - Yes -
1 X 230V
F204 1 N/A Solenoid valve, N.C. - Yes -
1 X 230V
F205 1 N/A Solenoid valve, N.C. - Yes -
1 X 230V
F206 1 N/A Burner lance and nozzle - Yes -
F207 1 N/A Electrical heater - Yes -
F208 1 N/A Servo motor for oil regulating - Yes -
1 X 230V
F212 1 N/A Temp. transmitter, 4-20 mA - Yes -
0 – 200 ºC
F214 1 N/A High oil pressure switch - Yes -
*?* – *?* BAR
F217 1 N/A Oil regulating valve - Yes -

F218 1 1/4'' Pressure gauge - Yes -

0 – 60 BAR
F219 1 1/4'' Pressure gauge - Yes -
0 – 60 BAR
F222 1 N/A Temperature sensor –fuel oil heater - Yes -
*?*

Configuration system release 6.1.16 Page 1/1

 LIST OF PARTS – KBO BURNER Configuration: 101052–1

Tag No. Qty. Dim (DN) Application Type AI Datasheet or

supply Drawing
F223 1 N/A Temperature switch –fuel oil heater - Yes -
with safety device
F224 1 N/A Limit Switch – burner in position - Yes -
F225 1 N/A Pressure transmitter, 4-20 mA - Yes -
0 – 40 BAR
F235 1 N/A Non return valve Yes -
R1 1 N/A Fan - Yes -
R3 1 N/A Low combustion air pressure - Yes -
5 – 50 m BAR
R7 1 N/A Air damper - Yes -
R15 1 N/A Fan motor - Yes -
3 X 440V, 60Hz
R16 1 N/A Servo motor for air damper - Yes -
1 X 230V

Configuration system release 6.1.16 Page 2/2

 LIST OF PARTS - STEAM/WATER Configuration: 101052–1

List of parts - steam/water

Boiler plant: .............................................................................................................. 1 x MISSION™ OC
Request No.: ...................................................................................................................................101052
Configuration No.: ...................................................................................................................................1
Hull No./Nos: ............................................................................. YZJ2006-757/-766, YZJ2006-779/-784
Project No./Nos.: ..................... 101052-01/-02/-03/-04-/-05/-06/-07/-08/-09/-10/-11/-12/-13/-14/-15/-16
P&I Diagram drawing No.: ....................................................................................................X01:045236
P&I Diagram revision.: ............................................................................................................................ c
Date: ................................................................................................................................ 07 January 2008

Reading guide:
List of Parts reflects parts delivered by Aalborg Industries.
Tag Numbers are given without the index used on the P&I diagram. E.g. “C2” is found on the P&I
Diagram as “1C2” and “2C2” for boiler 1 and 2 respectively.

MISSION™ OC boiler
Tag No. Dim Qty. Application Type AI Datasheet or Drawing
(DN) supply
Composite boiler (Qty. gives the number of parts per composite boiler)
1C 1 N/A MISSION™ OC - Yes 04Y:046863
C1 1 32/50 Safety valve Safety Yes 261 1171
C301 1 32/50 Safety valve Safety Yes 261 1171
C184 1 50 Expansion joint for safety - Supplied 85Y_013421
valve by TAO
C484 1 50 Expansion joint for safety - Supplied 85Y_013421
valve by TAO
C186 1 N/A Remote pull for safety valve - Yes K03_032121
C486 1 N/A Remote pull for safety valve - Yes K03_032121
*C2 1 125 Main steam valve Stop Yes 6010 000254
*C3 1 32 Feed water valve Stop Yes 6010 000233
*C303 1 32 Feed water valve Stop Yes 6010 000233
*C4 1 32 Feed water valve Stop SDNR Yes 6030 000073
*C304 1 32 Feed water valve Stop SDNR Yes 6030 000073
C6 1 25 Scum valve Stop Yes 6010 000232
*C7 1 32 Blow down valve Stop Yes 6010 000233
*C307 1 32 Blow down valve Stop Yes 6010 000233
C9 1 1/2'' Sample valve Stop Yes 6220 000002
C10 1 1/2'' Air escape valve Stop Yes 6220 000002
C11 1 1/2'' Gauge board valve Stop Yes 6220 000002
C16 1 1 1/2'' Furnace drain valve Gate Yes 293 1116
C17 1 25 Water level gauge left Reflective Yes 7010 000431
C18 1 25 Water level gauge right Reflective Yes 7010 000430
C187 1 N/A Remote pull for water level - Yes K03_032122
gauge

Configuration system release 6.1.16 Page 1/1

 LIST OF PARTS - STEAM/WATER Configuration: 101052–1

Tag No. Qty. Dim Application Type AI Datasheet or Drawing

(DN) supply
C487 1 N/A Remote pull for water level - Yes K03_032122
gauge
C198 1 50 Drain valve for exhaust gas Gate Yes 253 1005
part
*C211 1 N/A Counter flanges incl. gaskets
- Yes K16:004096
*C212 set and bolts (not shown on
*C213 diagram)
*C214
W33 1 100 Water level meas. electrode - Yes -
Smoke outlet - MISSION™ OC (Qty. gives the number of parts per composite boiler)
C179 1 300 Smoke outlet - Supplied -
by TAO
K5 1 1/2 Temp. switch (high), smoke ATHs-20/a Yes 632 0110
outlet
Exhaust in-/outlet boxes - MISSION™ OC (Qty. gives the number of parts per composite boiler)
K305 1 1/2” Temp. switch (high), smoke ATHs-20/a Yes 632 0110
outlet
K6 1 1/2” Temp. Transmitter - Yes 8060 000026
Feed water pump for composite boiler - MISSION™ OC (Qty. gives the no. of parts per composite boiler)
M169 1 32 Feed water pump CR5-15 Yes 5540 000126
M170 1 32 Feed water pump CR5-15 Yes 5540 000126
M7 2 1/4” Pressure gauge - Yes 663 3118
M8 2 1/4” Pressure gauge - Yes 663 3122
M11 4 8 Needle Valve - Yes 666 6006
M130 1 N/A Remote start/stop box - Yes 8000 000036
Chemical dosing units - MISSION™ OC (Qty. gives the number of parts per composite boiler)
*3M23 1 CNPA Chemical dosing – combi. - Yes 9296 006003
1601
PPE2
boiler
Remote indication Steam pressure and Water level - MISSION™ OC
(Qty. gives the number of parts per composite boiler)
H2 1 N/A Remote indication of steam Digital Yes 8000 000071
pressure
W32 1 N/A Remote indication of water Digital Yes 8000 000071
level
Sample coolers – MISSION™ OC (Qty. gives the number of parts per composite boiler)
3M25 1 N/A Sample cooler – combi. SCS20 Yes 875 0005
boiler
Steam Dump Valve
N5 1 50 Steam dump control valve Control Yes 6050 000243
with pneumatic actuator
N6 1 1/4'' Filter regulator with auto. - Yes 291 5101
drain
Gauge board - MISSION™ OC (Qty. gives the number of parts per composite boiler)
C30 1 N/A Gauge board (Specified on Oil System Yes 61Z:047434
Diagram)
Boiler Control panel - MISSION™ OC
L1 1 Boiler Control panel Yes 63X03:047481

Configuration system release 6.1.16 Page 2/2

 LIST OF PARTS - STEAM/WATER Configuration: 101052–1

Boiler Plant - Common

Tag No. Dim Qty. Application Type AI Datasheet or
(DN) supply Drawing
Hotwell – Oil Detection
M145 1 Oil detection equipment - Yes
1M145 1 3/4 Sensor- 6 m cable - Yes 8310 000005
2M145 1 N/A Control unit - Yes 8210 000025
Salinity Control
M146 1 N/A Salinity control - Yes
M146.1 1 N/A Conductive electrode SL 700 E Yes 8620 000082
M146.2 1 N/A Control device SL 700 Yes 8210 000032
M146.3 1 25 T-piece - Yes 8500 000115
Boiler water test kit
M77 1 N/A Boiler water test kit (not shown - Yes 880 0050
on the diagram)
Water hose and spray gun
C191 1 N/A Water washing hose with nozzle - Yes 294 1001
(not shown on the diagram)

Configuration system release 6.1.16 Page 3/3