[TSI AV]

Hi,

I've got no wish to argue.

Sorry for "AMBIENT"... English is not my mother tongue.
Will learn it ... Thank You.

Regarding diesels...

Of course, every experience is appreciated.

But,
Statement, that "carbon builds up in inlet manifold due to low load" is very strange and unexplainable. And confusing for others as well.

Mostly carbon build up in air receiver occurs due to:

1. Oil leakages in turbo / mechanical blowers (if any).
2. Valve guides / valves are worn down.
3. Worn down liners.
4. Compression / oil scraping rings are worn down.
5. Exhaust passage is not clean / straight.
6. Valves are not tight enough.

Regarding "cleaning" of engine by running it 110 %:
1. Yes, I agree, that exhaust temperatures will be lower after that. Carbon will burn away. I also had to do this in some emergency cases.
But, if it has to be done from time to time, then the reason is not a low load (if running on MDO/MGO).
Normally the reason is a "not complete burning process".
This can be caused by many factors...
Injection, dirty air cooler, dirty turbo (nozzle ring, blades),
Intake air temperature, engine construction, etc...
2. This is a dangerous action. I have seen connecting rods coming out of crankcase...

Kindest regards,

Your dear Estonian friend

P.S. Peace ?...

[Bill Arthur]

Your knowledge of diesels is obviously outstanding.
But depending on the ship/engine room conditions,state of maintenance,then all diesels have a different history.My last project had 4 crossley pielsticks,which never had been turned over for a year,and had 2 siezed blowers.And a pakistani workforce trying to take crank deflections,raft heights while we were still on the hardstand(synchro lift).
Keep the faith...starting to like you...LOL

Kind regards

Bill

[Bill Arthur]

Sir,
During setting to work of a diesel gen set,normally 1meg,we had to test it to 110% overload.This was due to it was a warship and needed this capability.Obviously on the load bank we tested governor response,stability,droop factor,power factor etc.
The need to test it to 110% was the fact on a warship we need this capability, having many auto change over switches to keep our operating capacity to the full during any warfare action.Yes i have seen con rods coming out of crankcases and tappets burying themselves in the rocker covers,

Bill

[TSI AV]

Ok, seems like peace !

Yes, 110 % is used at every engine's delivery by means of load bank or water breaker.
And some "smartest" Class Surveyer may request such testings within a Special Survey (Class Survey)...
Uffff... hate this...

rgds,

Andrei











rgds,

Andrei

[K1W1]

Hi,

Both terms-Ambient Temperature and Pressure do exist.

I think what TSI AV was trying to get accross is the importance of having a positive pressurised engine room to ensure that there is sufficient air for the stoichiometric combustion process to be completed.

[TSI AV]

Hi,

Oooops,
Thought so...

Looks like my English is not so bad ....

rgds,

Andrei

[Northern Lights]

Bill Arthur,
Is the post on load testing accurate. 110% overload or was the machine run at 110%. Was it diesel or turbine. I witnessed, but was not apart of a load test that the load bank operator took a 48 KW machine to 100% overload for about an hour. The machine was stamped 90KW, but when the machine was fit up and wired single phase the installer did not derate the KW for the application. A 90 KW 480/240 three phase machine derates to 48 KW in a single phase wiring configuration. The electrical end caught on fire. Short duration fire, but fire was coming from the windings. The mismatch of the electrical end to the hp allowed this to occur. Normally you take a machine much above 130% and it stalls the diesel and or it bogs down. The interesting thing about a generator is that I can get 100KW out of a 5KW end if I can keep the winding cooled and I have enough HP.

Spread the Knowledge

[K1W1]

Hi,

I would from my own personal experience say that the load factor whilst being referred to as 110% that the load is actually only 10% over the maximum continuous rating of the machine.