Height difference between primary and emergency low water cutouts

Gateacre

Hey folks. Is there a standard for the height difference between a primary and emergency lwco? When our boiler was installed we were having issues with surging tripping the primary cutout. Rather than addressing water quality issues that were likely causing the problem, our contractor simply raised the primary cutout but not the emergency. As a result it takes about 20 seconds for the emergency cutout to trip when doing a blowdown leading to excessive fresh water being taken on.

Thanks

Robert O'Brien

CUT_EC_web0825.pdf

Both need to be above the minimum safe water level, which means they're about the same height. See attachment