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Re: Minimum Generator Loading to avoid WET-Sack

The general rule of thumb is 50% of the nameplate rating, but like I said above, a lot of factors affect the actual point at which you will start having problems.

 

MikeL

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Re: Minimum Generator Loading to avoid WET-Sack

did you mean 50% of rated prime power (510 KW) or 50% of full rated stand-by  (600KW)

Super Contributor

Re: Minimum Generator Loading to avoid WET-Sack

On most turbocharged engines ideally you want to operate above 50% rated load as much as you can. Each engine and rating will be slightly different, but in general, older engines with rectangular ring packs and relatively lower BMEP's are more tolerant of low load operation. Newer design engines with keystone rings, highly turbocharged and high cylinder pressures at rated output tend to be more sensitive to longer periods of low load operation.

 

A lot of factors come into play, best bet is to watch for slobber, poor transient response and an increase in exhaust smoke, then operate the engine at the highest load possible and see if the exhaust.

 

More predictive types of procedures, like monitoring blowby rates and lube oil consumption can also provide good indications of when the engine is being affected by low load operation.

 

Hope that helps, MikeL

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Minimum Generator Loading to avoid WET-Sack

I have a 600 KW 1800 rpm 750 KVA stand-by CAT Generator model 3412

and it operates as a PRime with de-rating 15% of stand-by rating and loading factor of 0.7 (prime load= 357 KW)

to avoid engine wet-sack waht's minimum operating load value