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What actions should be taken in case of scavenge fire?

What actions should be taken in case of scavenge fire?

1. Stop the engine immediately and engage turning gear, and keep engine rotating with turning gear. 2. Extinguish the fire with fixed fighting system for scavenge fire.

What is the indication of scavenge fire?

Indication of Scavenge Fire Black smoke with exhaust due to incomplete combustion in that unit. Discharging of spark, flame or smokes through drain cocks from scavenge air boxes. Rise of pressure and temperature of air in the air box below the piston. Visible evidence of fire if a transparent window is fitted.

What is scavenge space in marine engine?

Scavenge space, is the space in the 2 stroke diesel engines, which is used for the scavenge air, including the space below the piston. The air supplied by the auxiliary blowers or the turbocharger for the combustion comes here first and then goes to the combustion space.

How do you stop a scavenging fire?

To avoid scavenge fires occurring the engine timing and equipment maintenance should be correctly carried out. The scavenge trunking should be regularly inspected and cleaned if necessary. Where carbon or oil build up is found in the scavenge, its source should be detected and the fault remedied.

What is scavenge inspection?

Scavenge inspection is inspection of piston, piston rings, cylinder liners etc. Of the main engine through scavenge ports. This helps for detecting leakage from the piston and cylinder cover, if any finish jacket cooling water and lubricating oil pumps should be running during the scavenge port inspection.

What is scavenge fire in marine engineering?

A scavenge fire can occur when the accumulated oil in the scavenge spaces are ignited by blow past from the combustion space. The oil within the scavenge space is present due to the drainage from the piston ring area, and should flow out of the engine under constant “blow down” into a drain tank.

Why is scavenging important?

Scavengers play an important role the food web. They keep an ecosystem free of the bodies of dead animals, or carrion. Scavengers break down this organic material and recycle it into the ecosystem as nutrients.

What factors does scavenging depend on?

Satisfactory Scavenging Depends on:

  • Efficient evacuation of exhaust gases.
  • Exhaust ports or valves open before scavenge ports.
  • Scavenge ports close after the process of gas exchange.
  • Loss of fresh air through exhaust passage to be minimum.

What is scavenge space in ship?

Scavenge space, as we know, is an enclosed space under the piston of the engine. Stuffing box on down side and piston on top makes it a closed space. And fresh pressurized air is continuously fed into this space.

What is scavenge manifold?

Scavenging is the process of replacing the exhaust gas in a cylinder of an internal combustion engine with the fresh air/fuel mixture (or fresh air, in the case of direct-injection engines) for the next cycle.

What is scavenging in ship?

For a better combustion of fuel oil inside a marine diesel engine, an adequate supply of fresh air is needed. The method by which sufficient amount of air is provided to the engine’s cylinder is known as scavenging. Scavenging is generally provided by the engine’s turbo-charging system.

What are the 3 methods of scavenging?

There are three type of scavenging system:

  • Cross flow scavenging.
  • Loop flow scavenging.
  • uni-flow scavenging.

What do you understand by scavenging explain?

to take or gather (something usable) from discarded material. to cleanse of filth, as a street. to expel burnt gases from (the cylinder of an internal-combustion engine).

What is the importance of scavenging?

Scavenging is the process of removing exhaust gases from the cylinder after combustion and replenishing the cylinder with fresh air. Efficient scavenging is necessary for good combustion of fuel inside the engine cylinder. The passage of scavenge air will also assist cooling of the cylinder, piston and valves.

What are the three types of scavenging?

The process of admitting air and expelling exhaust gas is known as scavenging. The three main types of scavenging for two stroke engines are cross flow, uniflow and loop flow.

What are the importance of scavenging?

Scavengers play an important role the food web. They keep an ecosystem free of the bodies of dead animals, or carrion. Scavengers break down this organic material and recycle it into the ecosystem as nutrients. Some birds are scavengers.

How to avoid scavenge space fire in an engine?

Scavenge space fire can seriously damage the engines and also will hamper in the working of the same. Such fires should be avoided in any case and same can be done by following simple practices. Scavenge space, as we know, is an enclosed space under the piston of the engine. Stuffing box on down side and piston on top makes it a closed space.

What causes scavenge fires in marine engines?

Marine Machinery, Engines & Controls Scavenge fires are caused by lube-oil, diesel or heavy fuel oil gathering around the area of the scavenge ports. This is ignited by sparks form the combustion area passing the piston rings and coming in contact with the flammable oil.

What is a scavenge fire?

Scavenge fires are caused by lube-oil, diesel or heavy fuel oil gathering around the area of the scavenge ports. This is ignited by sparks form the combustion area passing the piston rings and coming in contact with the flammable oil.

What are the signs of a scavenge fire in an engine?

Dirty scavenge space. 5. Poor combustion due to leaking fuel valves or improper timing. 6. Insufficient or excess cylinder lubrication. There are a few signs which indicates a scavenge fire. One should be extremely cautious in case any of the below mentioned conditions are observed. 1. Scavenge temperature will start increasing. 2.