Main Engine Decarbonization / Bunot Piston Part 1
HTML-код
- Опубликовано: 25 июл 2021
- MAIN ENGINE DECARB PREPARATION, PROCEDURE & COMMISSIONING
What is Decarbonization ?
Removal of the accumulation of carbon from cylinder heads and valve gear, pistons and rings, allowing the inspection of the liner. Decarbonization is an important part of the maintenance of main engine. Carried out after every 10000 running hours as a repair work, process can be down in less span, if there is a major problem in the engine. One engine overhaul unit takes a time span of around 12 to 14 hours. So this process is conducted only when sufficient time is there and that too when engine is not running.
Preparation
The chief engineer is the person who decides what has to be done in the ship machinery and tells the second engineer to implement the process. The second engineer is the sole and master of this whole process and he or she will be the one who will decide what we have to do in the whole process. Various types of tools which will be used while carrying out the whole work is assembled at one position. What person will do what type of job are assigned by the second engineer only and this avoids any type of confusion during the time of overhauling of the engine.Now when the ship comes to halt like port or the dry dock. The designated engine staff comes to the engine room and they are ready to do the process. Bridge is informed before carrying out this processas it would be dangerous if they are not informed and they gave the power to start the engine.
1.Make sure the all stand by auxiliary engines are ready
2.Keep all the special tools and other tools ready
3.Go through the previous records/manual for clearance and adjustments
4.Put the display card "MEN AT WORK", "DON'T START"
5.Close air bottle valve to auxiliary engine and engine start and stop valve
6.See that the turning bar is not in the flywheel and should be in place
7.Open the indicator cocks
8.If the main bearing is to be removed, check crank shaft deflections
9.Close lube oil, fuel oil, fresh water inlet/outlet valve, drain the cooling water line and remove connectionsThe list of the faults which were noted when the engine was running is also taken out and stick at a place so that everyone is aware what we have to do and what are the tools which are needed in this process.Now the engine staff engages the turning gear. The main purpose of the engaging of the turning gear is that you will not experience the turning of shaft due to turning of propeller which may happen due tothe currents of water.The whole unit which is to be dismantled is isolated from each system like the fuel, water cooling, lubecooling etc.
Procedure:
Removal of cylinder head
1.Scavenge manifold, exhaust manifold rocker arm, lube oil drain connection from rocker arm, rocker arm tank and cover connection to be removed
2.Fuel oil high pressure connection from fuel pump to the injector, fuel valve cooling connectionsin and out (either diesel or water) to be removed
3.Remove the rocker arm assembly and the push rod. Remove all the mountings such as starting valve, indicator cock, relief valve and exhaust valve assembly
Hello Hon..2nd Engr.Benedict
May 4,2021..Those engine crews were awesome... That's my last major job before I left this ship last May 7,2021
Ikaw pala sec. good job
It seem like might also needed of helmet when the used of crane in a major overhauling and may include to the Risk Assessment. Good job sir
I agree with you 100% innovators TV. thanks for reminding.
After traveling and finishing HandOver u get the task of ME unit overhaul. Your family should be proud of what u r doing for them. Wish u all the best on this journey and thank you for sharing this useful info with others, looking forward to seeing more from u. 👍👍👍👍
Hi Ali Gohar Mughal thank you so much for your message.