Temperature sensors in cofferdam
Part 5 : Cargo Auxiliary and Ballast System 5.1 Temperature Monitoring System
2. Operating Procedures
5.6 Fire Fighting System .1 Fire and Deck Wash System
(See Illustration 5.6.1a)
The fire main system is supplied from the engine room by the two Fire Pumps.
They are electric motor driven vertical centrifugal pumps, with a delivery capacity of 150 m3/h at 100 MTH.
Specification
Fire, Bilge & G/S Pump
Maker: Shinko Ind. Ltd.
Type: Vertical, centrifugal, electric motor driven with self priming
Model: RVP200-2MS
Number of sets: 2
Rated out-put: 150 m3/h X 120 MTH Rated out-put: 245 m3/h X 35 MTH Fire Pump
Maker: Shinko Ind. Ltd.
Type: Vertical, centrifugal, electric motor driven Model: RVP200-2MS
Number of sets: 1
Rated out-put: 180 m3/h X 120 MTH Jockey Pump
Maker: Shinko Ind. Ltd.
Type: Horizontal, centrifugal, electric motor driven Model: SHQ50M
Number of sets: 1
Rated out-put: 2 m3/h X 100 MTH Emergency Fire Pump
Maker: Shinko Ind. Ltd.
Type: Vertical, centrifugal, electric motor driven with self priming
Number of sets: 1
Rated out-put: 72 m3/h X 120 MWC
The Emergency Fire Pump is located under S/G Flat. This pump is a diesel engine hydraulic power pack driven vertical centrifugal pump with its own direct sea suction. The pump rate is 72 m3/h X 120 MTH.
The fire main is kept pressurised by a Jockey Pump rated at 2 m3/h X 120 MTH.
This pump is an electric motor driven horizontal centrifugal pump and has an automatic pressure cut-in/out switch. Pressure switches and a low level alarm switch are fitted on the accumulator tank (capacity: 2.0 m3) to pressurise the fire main line.
The deck fire main has a main isolating valve FD570F before the port, starboard and ring main isolating valves. The ring main is fitted with a further four section isolator valves on each side at regular intervals along the deck to allow any part of the system to be supplied from either side of the ship.
The fire main also serves the water curtain below the port and starboard manifold areas during cargo loading and unloading.
The fire main supplies the driving water for the bilge eductors in the side passage way, pipe duct, forward pump room, bow thrust room, bosun’s store and cofferdams. It also supplies anchor washing water.
Fire hydrants are situated along the cargo space, with a fire hose mounted adjacent.
The Emergency Fire pump can be started locally, from the bridge or from the Fire Control Station(FCS).
Under normal operating conditions the fire main will be under pressure in port, supplying the manifold water curtain and with hoses run out as a fire precaution.
Note
Sea chest valve(WS146F) for em’cy fire pump to be locked open position.
Illustration 5.6.2a Water Spray System
Life Boat Embarkation (P&S) N= 10 ea
Line Water Spray Pump
Cofferdam
From Water Spray Pump in Engine Room
Cargo Domes Sect. View
Looking FWD
Engine Room
No.4 Liquid Dome
El. Motor RM Cargo Machinery RM No.4
5.6.2 Water Spray System (See Illustration 5.6.2a & 5.6.2b) General
The accommodation block front, cargo machinery and electric motor room, cargo liquid and gas dome and manifold areas are protected by water spray from the effects of fire, gas leakage, or liquid spill. There is one (1) 700 m3/h x 90 MTH Water Spray Pump, mounted on the bottom platform in the engine room, delivering to three (3) spray rails across the accommodation block front, lifeboat embarkation areas port and starboard, cargo machinery room sides and deck domes/manifolds. They are grouped into three sections as follows;
y Group 1: Accommodation (front wall and side wall up to 3m to aft), lifeboat embarkation area and access
to the life boat.
y Group 2: Cargo machinery and electric motor room.
y Group 3: Cargo manifold port and starboard.
y Group 4: Cargo liquid and gas dome valves.
Each group main spray rail has a remotely operated hydraulic isolating valve operated from the fire control station, CCR and manually at the local side. The spray pump can be started locally and from the wheelhouse, CCR, on the main deck close to the accommodation exits and the fire control room.
Each main group is subdivided into smaller sections, with a flow regulating and section isolating valve fitted. The accommodation front is covered by three (3) such subsections, beginning at deck level D, right through to the navigation/bridge deck. The decks below D deck will have sufficient flow passing over them so that they do not need to be covered by a fixed rail.
The nozzle arrangement is as shown below; for plain vertical surfaces, nozzles are set 800 mm apart and at 45° to the vertical. Headers are 250 mm from bulkheads and nozzles are flat cone design.
Principle
The system is capable of covering all areas mentioned above with a uniformly distributed water spray of at least 10 litres/m2 per minute for the horizontal protected surfaces and 4 litres/m2 per minute for the vertical surfaces.
Area coverage extends 0.5m in length from any direction of pipes, fittings, valves or surfaces and the area of the drip tray whichever is greater.
- The water spray pump is capable of covering all protected surfaces simultaneously.
- There is a connection with an isolating valve between the water spray main and fire main line.
Number of Nozzles and Capacity
Group 1 (Accommodation)
Satcom : 1 nozzle at total flow 99 l/min
Top to Nav. DK.: 26 nozzle at total flow 491 l/min Nav. To D DK.: 36 nozzle at total flow 756 l/min D to C Deck : 36 nozzle at total flow 756 l/min C to B Deck (Side): 8 nozzle at total flow 168 l/min B to A Deck (Side): 8 nozzle at total flow 168 l/min Life Boat Embarkation (P): 10 nozzle at total flow 195 l/min Life Boat Embarkation (S): 10 nozzle at total flow 195 l/min Life Boat Door (P): 5 nozzle at total flow 195 l/min Life Boat Door (S): 5 nozzle at total flow 195 l/min Total : 139 nozzle at total flow 2928 l/min Group 2 (Cargo Machinery & Electric Motor Room.)
Forward Side Wall : 14 nozzle at total flow 336 l/min After Side Wall : 14 nozzle at total flow 336 l/min Port Side Wall : 25 nozzle at total flow 600 l/min Bottom : 43 nozzle at total flow 1419 l/min Total : 96 nozzle at total flow 2691 l/min Group 3 (Cargo Manifold)
Port Side : 8 nozzle at total flow 888 l/min Starboard Side : 8 nozzle at total flow 888 l/min Cargo Valve : 3 nozzle at total flow 77 l/min Total : 19 nozzle at total flow 1853 l/min Group 4(Cargo Liquid & Gas Dome)
No.1 Liquid Dome : 23 nozzle at total flow 763 l/min No.2 Liquid Dome : 16 nozzle at total flow 655 l/min No.3 Liquid Dome : 18 nozzle at total flow 722 l/min No.4 Liquid Dome : 16 nozzle at total flow 672 l/min Cargo Valve : 4 nozzle at total flow 100 l/min No.1 Gas Dome : 12 nozzle at total flow 105 l/min No.2 Gas Dome : 12 nozzle at total flow 105 l/min No.3 Gas Dome : 12 nozzle at total flow 112 l/min No.4 Gas Dome : 12 nozzle at total flow 112 l/min Cargo Valve : 5 nozzle at total flow 585 l/min Total : 130 nozzle at total flow 3931 l/min
There are drain connections provided at main deck level below the manifold area and below the life boat area.
The water spray system can be flushed with fresh water by cross connecting.
Illustration 5.6.2b Water Spray Nozzle
① "FF" Type Fogjet Spray Nozzle ②"HH-W" Type Fulljet Spray Nozzle
③"K" Type Floodjet Spray Nozzle
⑤"GG-W" Type Fulljet Spray Nozzle
④"HH-WSQ" Type Fulljet Spray Nozzle
Part No. 1bar 2bar 3bar 5bar 7bar 10bar NPT 1
Capacity (L/Min) Spray Angle (˚) 1bar 2bar 3bar 4bar 5bar 6bar
NPT 3/8
Capacity (L/Min) Spray Angle (˚) 0.7bar 1.0bar 1.5bar 2.0bar 3.0bar 4.0bar
NPT 1/4
Capacity (L/Min) Spray Angle (˚) 1bar 2bar 3bar 4bar 5bar 6bar
NPT 1/2 Cap.
Size
45WSQ 3.6 20.0 27.0 33.0 37.0 41.0 44.0
Dimensions
Capacity (L/Min) Spray Angle (˚) 1bar 2bar 3bar 4bar 5bar 6bar
NPT 1/2 Cap.
Size
35W 15.6 21.0 25.0 29.0 32.0 34.0
Dimensions