Trouble carbonating firkin/cask kegs

[birdman200]

At our brewery we have had trouble carbonating our firkin kegs lately. We have been putting in about 1/2 cup of dissolved table sugar in each 10 gallon keg. We have gotten little to no carbonation for the majority of them. We have let the kegs sit for several weeks at room temperature prior to putting them into cold storage.

Should we use more sugar? Different sugar? Also, there has been no off flavors present when we tasted them, so infections/bacteria ruining the carbonation is out the question.

Thanks!

 

[Eisendrath]

yeast still alive?
sterilization left in the casks?

 

[BrewThruYou]

I'm far from an expert, but that doesn't seem like much for 10G.

 

[Eisendrath]

I read "lately" to read as if 1/2 C had worked well in the past.
A lot of the folk here keg/bottle weeks before I call fermentation complete.
Residual undigested sugars also contribute to final CO2. If that has changed, it could contribute as well.

 

[onthekeg]

Try a full cup of sugar. I use 1/2 cup in a 5 gal keg

 

[rollinred]

Yeah 1/2 cup for 10g... not enough.