Chapter 6 Fixed Ext Eqpmt_1

8/10/2019 Chapter 6 Fixed Ext Eqpmt_1

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Chapter 7/ Fixed Ext Eqpmt 1JL sept 2007chenck/may2002/v3

Fixed Extinguishing

Equipment (Part 1)

Chapter 6


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JL sept 2007chenck/may2002/v3 Chapter 7/ Fixed Ext Eqpmt 2

Extinguishing Equipment

In the previous chapter, you wereinformed that there are two types of

extinguishing equipment. They are

Portable extinguishers

Water, Foam, Powder and CO2

Fixed Extinguishing Equipment


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Fixed Extinguishing Equipment

There are generally two types onboard

Firemains

And one or more of the following

CO2

Foam Sprinkler


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Firemains

Basically these are fire hydrants. They arefound on all ships. There are 2 types.

Single Firemain System

Looped Firemain System


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Basically, It draws sea water from engine room

Sea water is pumped through a main pipe. There are branches from

main pipe at each level

Fire hydrants are added

on these branches

Fire pump

Fire hydrants


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Main Fire

Pump

Emergency Fire

Pump

Isolating valve

Fire hydrants

Points to noteThe single fire main line

The main and emergency fire pumps

The isolating valve

Ship shore connection


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Emergency

fire pump


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The fire mains Just one pipe running forward and aft of

the ship


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Main fire pump and emergency firepumps are kept in separate Class A

division bulkheads.

Why is this important?

Main Fire Pump Emergency Fire Pump


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Reason why main and emergency firepumps are kept separate

Should a fire break out in theengine room, both pumps willnot be destroyed together.

Main Fire Pump Emergency Fire Pump


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Properties of Emergency Fire Pump Has its own source of power supply

(usually diesel drivennot electrical) Kept separate from main fire pump

Emergency Fire Pump


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Isolating Valve When engine room catches fire and staff has

loss control of it Main fire pump will most

likely to be out of action

Isolating valve

Main Fire Pump


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When the engine room catches fire and is out of control, the fireshould be contained and prevent from spreading

Emergency fire pump should be started and boundary cooling beapplied on the outside of the engine room

If the isolating valve is left open, the water will go into theengine room. This is not only a waste of water but effectivewater pressure will drop.

Fire in engine

room


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Boundary Cooling

Applying waterspray on the

outside of thecompartment toprevent it from

spreading


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Boundary Cooling

Engine Room

Applying water

spray on the

outside casing of

the engine roomto prevent fire from

spreading


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Ship-Shore Connection

When a ship is in port and catches fire, you will need water from shore

fire hydrants to combat the fire.

However, ships built from different countries are built to certainstandards, and the hoses from the ship may not fit the shore hydrants.(eg your 3-point electrical power plug will not fit Taiwans electricalpower point).

You will need an interface.

This interface is known as the International Ship-Shore Connection.


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ShipShore Connection


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Construction is similar to single main except in one area. Instead ofa single pipeline on deck, it has a loop.

Main Fire

Pump

Emergency Fire

Pump

Isolating valve

Fire hydrants


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Fire Mains

Advantage of a loop main against a single mains When a single mains pipe fractures, sea water supply

can be disrupted.

In a looped mains, the sea water can be reroutethrough another path. Disadvantage is that they aremore expensive to build.

break


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Summary of Fire Mains

Fire mains are found on all ships. They areeither

Single Firemain System or Looped Firemain System

We now look at accessories to the fire mains, namely Hydrants

Hoses

Nozzles


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Fire Mains Accessories

These are

Fire Hydrants

Fire Hoses

Hose Nozzles


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Fire Hydrants

These areattached to your

fire mains.

You connect your

fire hoses to them.


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Fire Hydrants

Sometimesthey have hoses

alreadyconnected to thehydrants


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Fire Hoses


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Fire Hoses

They must be made of non-perishablematerials.

At least one hose for each fire hydrant.

One hose for every 30 metres of the ship


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Hose Couplings

They can be the snap-on type or thebayonet type


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Hose Nozzles

They should be the dual purpose type,able to provide

Solid jet Spray jet


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Solid Jet Nozzles


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Solid Jet Nozzle


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Solid Jet Nozzle

Strengths High pressure discharge

Deep penetrationAble to aim easily at the seat of fire

Weakness Little cooling effect


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Spray Jet Nozzle


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Spray Jet Nozzle


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Spray Jet Nozzle

Strength Excellent cooling ability

Able to push back the smoke Employed as a heat curtain, allow closer

approach to the scene of fire

Disadvantage Lack of penetration


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Summary of Accessories

Fire Hydrants

Fire Hoses

Hose Nozzles

Solid jet Spray jet


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End of Topic

Chapter 6 Fixed Ext Eqpmt_1

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