Pig Trap Interlocking

Pig-Lancher-v31Safety interlocks are an essential feature in the design of pig traps. SFC interlocks can be specified to ensure the minimum safety arrangement of interlocking the vessel vent valve with the pig trap closure. This arrangement ensures the vessel vent valve is open before any attempt can be made to open the closure. With interlocks fitted to both the vent valve and pig trap closure, a key is released when the vent valve is opened. Removing the key from the vent valve locks the valve in the open position. This key is coded in common with the closure lock and only by opening and locking the vent valve, can the operator use the correct key to proceed to unlock and open the closure.