12. Prevention of Ignition and Fire in ER_2012 [Compatibility Mode].pdf

02 September 2009

12. Prevention of Ignition and Fire in E/R

Course

No.

2004

Det Norske Veritas AS. All rights reserved.02 September 2009

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Purpose of the rules and regulations;

Prevention of Ignition and Fire - E/R

To prevent ignition of combustible materials or flammable liquids


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Means shall be provided to control leaks of flammable liquids

The following functional requirements are to be met;

Means shall be provided to limit the accumulation of flammable vapours

Ignition sources shall be restricted

Ignition sources shall be separated from flammable liquids


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Arrangements for fuel oil, lubrication oil and other flammable oils:

In emergency generators fuel oil with a flash point equal to or higher than 43C may be used.

No fuel oil with flash point of less than 60C should be used.

As far as feasible, parts of fuel oil system containing heated oil under pressure exceeding 1.8 bar shall not

Be placed in concealed positions such that defects and leaks can not be easily observed.

The engine room in way of these parts of the fuel oil system shall be adequately illuminated.


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When it is necessary to locate fuel oil tanks (except DB tanks) adjacent to or within E/R

Arrangements for fuel oil, lubrication oil and other flammable oils: Fuel oil, lubrication oil and other flammable oils shall not be carried

in forepeak tanks.

As far as practicable, fuel oil tanks shall be part of the ships structure and shall be located outside E/R.

At least one of the tank sides shall be contiguous to the engine rooms vertical boundaries, and

Shall preferably have a common boundary with the double bottom tanks.

The area of the tank boundary common with the E/R shall be kept to a minimum.


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Acceptable Arrangements, MSC.1/Circ.1322


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When fuel oil tanks are situated within the boundaries of the E/R


In general, the use of free-standing fuel oil tanks shall be avoided.

They shall not contain fuel oil having a flash point of less than 60C.

When accepted, they shall be placed in an oil-tight spill tray of ample size having a suitable drain pipe leading to a spill oil tank.

No fuel oil tank shall be situated where spill or leak therefrom can represent a fire/explosion hazard by falling on heated surfaces.


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Fuel oilstorage,settling orservice tankV 0.5m Fuel pipe

Above DB

Fuel oil storage, settling or service tanks having capacity of 500L on more located above double bottom


Shall be fitted with a valve or cock directly on the tank capable of being closed from outside the E/R.

Limit the amount of flammable liquid in case of fire in the E/R, or in case of damaged pipe.


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Quick-closing Valve


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Quick-closing Valve Cabinet


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Valves under static head fitted on the external wall of fuel oil tanks are not to be of grey cast Iron.

The jacketed piping system shall include a means for collection of leaks and arrangements shall be provided with an alarm in case of fuel oil line failure.


External HP fuel delivery lines between the HP fuel pumps and fuel injectors

To be protected by a jacketed piping system capable of containing fuel from a HP line failure.

A jacket pipe incorporates an outer pipe into which the HP fuel pipe is placed, forming a permanent assembly.


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Fuel oil lines shall not be located immediately above or near units of high temperature such as :

- Boilers- Steam pipes- Exhaust manifolds- Silencers- etc.

As far as feasible, fuel oil lines shall be arranged far apart from:- Hot surfaces.- Electrical installations.- Other sources of Ignition.

And shall be screened of otherwise suitably protected to avoid oil spray or oil leak onto sources of ignition.The number of joints in such piping systems shall be kept to a minimum.



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Surfaces with temperatures above 220C which may be impinged as result of a fuel system failure

To be properly insulated.

Precautions shall be taken to prevent any oil that may escape under pressure from any

- Pump- Filter- Heater

From coming into contact with heated surfaces.



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As far as feasible, parts of lube oil systems shall not be placed in concealed positions such that defects and leaks can not be easily observed.

Arrangements for lubrication oil:

No lube oil tank shall be situated where spill or leak can represent a fire/explosion hazard by falling on heated surfaces.

The engine room in way of the lube oil system shall be adequately illuminated.


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Lube oiltank

V 0.5m Lube oil pipeAbove DB

Shall be fitted with a valve or cock directly on the tank capable of being closed from outside the E/R, unless :


1. The tank is provided with valve(s) normally closed during operation of the ship.

2. Unintended operation of a quick closing valve could endanger the safe operation of the main propulsion and essential aux. machinery.


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Valves under static head exceeding 7 bar and a design temperature above 60C, fitted on external wall of lube oil tanks are not to be of grey cast iron.

Lube oil lines shall not be located immediately above or near units of high temperature such as :

- Boilers- Steam pipes- Exhaust manifolds- Silencers- etc.



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And shall be screened or otherwise suitably protected to avoid lube oil spray or lube oil leak onto sources of ignition.

As far as feasible, lube oil lines shall be arranged far apart from:- Hot surfaces- Electrical installations- Other sources of ignition


The number of joints in such piping systems shall be kept to a minimum.


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Surfaces with temperatures above 220C which may be impinged as a result of a lube oil system failure


Precautions shall be taken to prevent any lube oil that may escape under pressure from any

- Pump- Filter- Heater

From coming into contact with heated surfaces.

To be properly insulated.


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Anti-Splashing Tape;

q Type Approval Anti-Splashing Tape for pipe joints and fittings available.

q Limitations as to pressure, temperature and pipe sizes.

q Drain to be considered, otherwise it may increase hazard.


Slide 23

Control of flammable liquid;


The controls should be located outside the space concerned (i.e E/R/purifier room).

Means of control shall be provided for stopping;

- Fuel oil transfer pumps- Fuel oil unit pumps- Lube oil service pumps- Thermal oil circulating pumps- oil separators(purifiers)


Slide 24

Hydraulic power units ;


Separate room in E/R

Hydraulic power units with working pressure above 15 bar and power delivery higher than 5 kW, located within the boundaries of a machinery space category A.

If it is impracticable to locate such units in a separate room, adequate shielding shall be provided in order to avoid potential oil leakages or spray onto any sources of ignition


Slide 25

Purifiers for heated fuel oil ;


Separate room in E/R

Purifiers for heated fuel oil, located within the boundaries of a machinery space category A

-Self-closing steel doors-Independent mechanical exhaust ventilation-A ventilation supply that can be isolated from the engine room ventilation-A fixed fire detection system and -A fixed local application fire-extinguishing system capable of being activated from outside the purifier room


Slide 26

Purifiers for heated fuel oil ;


Manual closing of ventilation openings for the purifier room shall be possible from outside the room at a position close to where the local extinguishing system is activated.

It is impracticable to provide a separate room for purifier for heated fuel oil, special consideration shall be given with regard to their location, ventilation condition, containment of possible leakages and shielding from ignition sources.

For machinery spaces category A above 500 m3 in volume, the purifier shall be protected by a fixed local application fire-extinguishing system.


Slide 27

Oil Penetration;


In spaces where penetration of oil products is possible

The surface of insulation shall be impervious to oil or oil vapours.


Slide 28

References;


- SOLAS 2000 Amendments Ch.II-2 Reg. 4 & 5

- SOLAS 1974 as amended Ch.II-2 Reg.15

- DNV Rules for Ships Pt.4 Ch.1 Sec. 3 A400

Documents

12. Prevention of Ignition and Fire in ER_2012 [Compatibility Mode].pdf