Friends, lets know what exactly happens in AIR STARTING SYSTEM in simple way:
QUESTIONS ON AIR STARTING SYSTEM:
Q1. To start a main propulsion 2s engine when the starting air is admitted into cylinder.
Ans: after TDC(affrox 15 degree).
Q2. D.E air start valve timing is controlled by ?
Ans: air start distributor
Q3. in operating condition what is the indication of leaking air starting valve?
Ans: overheating starting pipe to the cylinder head
Q4. The sequence of admitting starting air into the engine depends on?
Ans: normally the firing order
Q5. name some interlocks
Ans: turning gear interlock
telegram interlock
main lubricating oil pressure low interlock
jacket water temperature high interlock
control air pressure low
- It consists of 2 air reservoirs
- Reservoir used for storage of air at high pressure of 30 bar.
- Each reservoir has a capacity of 45 cubic meter.
- A stop valve is positioned next to the air reservoir. This is manual isolation valve of the system.To prevent pressure surge this valve is opened manually.
- Turning gear interlock is an important interlock of any manouvering system.It prevents attempted start and admission of air to the control lines while the gear is engaged.
- AIR start lever in the engine room actuates pre-starting valve. It permits 30 bar to actuate the pilot valve.
- The pilot valve allows the passage of control air to operate automatic valve and load up distributor slide valve.
- The automatic valve opens and closes automatically to fill up start air manifold while starting .It conserve air during starting. often it includes NR valve.
- Air distributor control valve regulates the admission of pilot air to operate cylinder air start valve in correct sequence.
- Cylinder air start valve admit starting air to individual cylinders.
- Distributor air operates this air start valve according to the firing order.
- An air manifold relief valve relieves excess pressure in the manifold.
- A flame trap prevents passage of flame from cylinder to manifold in the event of a jammed cylinder air start valve.
- A bursting cap ruptures to relive excess pressure in the event of start air line explosion.
- Pressure trips block the starting of engine if main engine and camshaft lube oil pressure are low.
QUESTIONS ON AIR STARTING SYSTEM:
Q1. To start a main propulsion 2s engine when the starting air is admitted into cylinder.
Ans: after TDC(affrox 15 degree).
Q2. D.E air start valve timing is controlled by ?
Ans: air start distributor
Q3. in operating condition what is the indication of leaking air starting valve?
Ans: overheating starting pipe to the cylinder head
Q4. The sequence of admitting starting air into the engine depends on?
Ans: normally the firing order
Q5. name some interlocks
Ans: turning gear interlock
telegram interlock
main lubricating oil pressure low interlock
jacket water temperature high interlock
control air pressure low
best content on air starting system...
ReplyDelete