towd crank
02-07-2012, 12:25 PM
I am working with a heat recovery system from an ammonia plant. The heat is transfered from the NH3 discharge into a hot water circuit used for underfloor heating and fan coils in an office block via a shell and tube heat exchanger.
I have carried out a risk assement and a potential problem has become apparent in that in the very remote possibility of a failure of a tube in the heat exchanger high pressure ammonia could enter the water circuit. This would not be a problem in one connection as there is a check valve on the outlet of the pump but I need to specify a Slam Valve for the other circuit.
Despite extensive searching on the internet I can find no suitable valve. What I am looking for is a springloaded gate or ball or butterfly valve with and electrical trigger to close it.
Can anyone out there suggest something siutable - it cannot be the first time this has been done!
I have carried out a risk assement and a potential problem has become apparent in that in the very remote possibility of a failure of a tube in the heat exchanger high pressure ammonia could enter the water circuit. This would not be a problem in one connection as there is a check valve on the outlet of the pump but I need to specify a Slam Valve for the other circuit.
Despite extensive searching on the internet I can find no suitable valve. What I am looking for is a springloaded gate or ball or butterfly valve with and electrical trigger to close it.
Can anyone out there suggest something siutable - it cannot be the first time this has been done!