Skip to main content

Fire prevention in drydock / port

    ➢    Machinery spaces are particularly vulnerable to fire hazards and casualties when large number of shore workers and their equipment are on board.
    ➢    Temporary electric connections ( like, lighting and power cable ) if not in proper order ( say, improperly connected or fused, having deteriorated insulation or being subjected to chafing from port holes or doorways ) can cause hazards.
    ➢    Air hoses passing through port holes and doors prevent them closing incase of emergency.
    ➢    Carelessness during welding or gas cutting operations may cause shower of sparks, resulting ignition of oily waste and oil.
    ➢    Minor or serious fires originate in oily rags and waste, rope and rubbish, lagging etc. in insulated spaces which may have smouldered for hours following ignition from cigarette end or sparks from electrodes or burning operations.
    ➢    The consequence of machinery space fire in port are severe because of large number of persons in the machinery space, their unfamiliarity with the ship and the probable inadequacy of the escape. It is essential that entrances are not restricted.
    ➢    On arrival dry dock, fire hoses from shore main should be connected fore and aft to the ship’s fire main through shore coupling.
    ➢    Smoking is permitted only in controlled stations.
    ➢    Arrangements such as blanking off or locking the operating mechanism of the C02 system, must be made to prevent the inadvertent release of smothering gas into machinery spaces.
    ➢    Communications and liaison arrangements should be made between ship & shore side officials.
    ➢    Ensure that precautions are compiled with –

            ▪    Temporary wiring is protected against chafing and is not overloaded,
            ▪    Adequate fire appliances are available,
            ▪    Access for shore fire fighters are adequate,
            ▪    Control center for external communications is established as a focal point for patrol man and the siting of breathing apparatus, axes and keys to locked spaces.

 When a fire occurs on board ship in port, the fire brigade must be called immediately no matter how small the out break. They will wish to be met at the gangway by a responsible officer who can act as a guide and provide as much as possible of the following information :
    a)    Where about of the fire,
    b)    Means of access,
    c)    Details of cargo together with stowage plan,
    d)    Ventilation arrangements,
    e)    Stability data,
    f)    Any person missing,
    g)    What fire fighting steps have been taken,
    h)    Condition of ship’s service,
    i)    Details of fixed installation, fire zones and general arrangements.

Comments

Popular posts from this blog

Differences between MC/MC-C and ME/ME-C engines

The electrohydraulic control mechanisms of the ME engine replace the following components of the conventional MC engine: Chain drive for camshaft Camshaft with fuel cams, exhaust cams and indicator cams Fuel pump actuating gear, including roller guides and reversing mechanism Conventional fuel pressure booster and VIT system Exhaust valve actuating gear and roller guides Engine driven starting air distributor Electronic governor with actuator Regulating shaft Engine side control console Mechanical cylinder lubricators. The Engine Control System of the ME engine comprises: Control units Hydraulic power supply unit Hydraulic cylinder units, including: Electronically controlled fuel injection, and Electronically controlled exhaust valve activation Electronically controlled starting air valves Electronically controlled auxiliary blowers Integrated electronic governor functions Tacho system Electronically controlled Alpha lubricators

Main engine interlocks

Interlocks are provided so that the engine can be started or reversed only when certain conditions have been fulfilled. When there is a remote control of engines, it is essential to have interlocks. This reduces the possibility of engine damage and any hazards to the operating personnel. Turning gear Interlock . This device prevents the engine from being started if the Turning gear is engaged. Running Direction Interlock . This prevents the fuel from being supplied if the running direction of the engine does not match the Telegraph. Starting Air Distributor in end position . This prevents starting from taking place if the shifting of the Distributor has not been completed. Main Lube. oil pressure, Piston cooling pressure, Jacket water pressure, and important parameters must be above the required minimum. Auxiliary Blower Interlock . The Auxiliary Blower is provided in case of Constant pressure turbo charging. Air Spring pressure Interlock . In case of the present generation...

Why is a man hole door elliptical in shape?

Any opening in a pressure vessel is kept to a minimum and for a man entry an elliptical hole  is lesser in size than the corresponding circular hole. More over it is prime concern to have a  smoothed generous radius at the corners to eliminate stress concentration. Hence other  geometrical shapes like rectangle and square are ruled out.  To compensate for the loss of material in the shell due to opening, a doubler ring has to be  provided around the opening. The thickness of the ring depends on the axis length along the  dirrection in which the stresses are maximum and the thickness of the shell. It is important to  align the minor axis along the length of the vessel, as the stress in this direction is  maximum. Longitudinal stress: Pd/2t where P= pressure inside the vessel, d= diameter of the arc, t=  thickness of the shell plating  Circumferential stress: Pd/4t  More over a considerable material and weight saving is achieved as...