Limit Controls on chemical storage tanks
Limit Controls on chemical storage tanks
(OP)
The AHJ has required an additional means of limit controls during filling(in addition to alarms and overflow pipe at top of tank)for large chemical tanks used for drinking water treatment. The AHJ basically wants a physical device to prevent the chemical from spilling out of the tank. To meet this requirement, we have designed a motorized valve (at the tank fill hook up) which is hardwired to automatically close during emergency situations when the tank high level alarm is initiated. Some engineers have opposed this design arguing that we are creating a more hazardous situation for the truck fill guy due to the back pressure in the truck hose when the valve closes. Does anyone have any other design ideas???





RE: Limit Controls on chemical storage tanks
RE: Limit Controls on chemical storage tanks
2. If your supplier can supply less than full truck load, just get the required volume which can safely be accomodated in your tank.
3. If full truck load is compulsory, manage your inventory programme to get a truck when you have safe level in the tank. Don't laugh, this is the way I do it with fuel oil storage.
Regards,
RE: Limit Controls on chemical storage tanks
I like the idea of limiting the speed of the motorized valve to avoid pressure surges. We currently have about 12 inches of "unusable" space below the overflow line and the high level limit. This would allow about 80 more gallons to pass through the closing valve before the tank overflows.