Something real strange happened. I brewed a cider at 22 psi and the sediment bottle went out of shape. I have brewed beers at that same pressure and never had an issue. Needless to say I am not impressed now at having to go an buy a new bottle.
You have a BK10 right?
Similar thing happened with me – bottle stated to get stress marks and looked not to far away from blowing out even though pressure was at or below guidelines. Best part though is the new versions are boiling water tolerant and bigger.
Gidday – the sediment bottles that come with the BrewMaster are awesome quality and can handle boiling water. We have find is that when brewers are making cider (which has residual yeast after the cooling has been put on) is that brewers close the bottom valve with yeast and cider in there and that builds up pressure and starts fermenting again as the sediment bottle is not cold. The bottles can handle 6 bar + pressure but with the valve closed the pressure has no where to escape and the sediment bottle will start cracking go out of shape due to the pressure in the bottle. hope this helps mate.