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Castell Safety - Trapped Key Safety Interlocks, Lockout Tagout Equipment and Drive-away Prevention
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Castell Safety - Trapped Key Safety Interlocks, Lockout Tagout Equipment and Drive-away PreventionCastellApplications

Applications - Valving - Pressure Vessel Safety System

Product Usage: MBV, DAE, AI

System requirement

The client needed to ensure that the pressure within the vessel was released to atmosphere prior to access into the area and that the process could only be carried out under a 'Permit to Work' scheme.

Condition 1

The Pressure vessel access point and the vent valve are locked closed with the process control key held in the control room. To gain access to the vessel the operative reports to the control room to obtain a permit to work certificate, On issue, the operator is issued the Castell 'A' Key.



Condition 2

The Castell 'A' Key is inserted into the vent valve 'MBV' interlock. Insertion of the key allows the valve to be operated from the closed to open position- With the valve open, the Castell 'B' Key can be removed, locking the valve open. The 'B' Key is then taken to the time delay 'DAE' unit to start the delay period. After the desired delay has elapsed the 'C' Key is released. Once released, the 'B' Key is trapped within the unit, preventing reversal of the safety system. The 'C' Key is then transferred to the 'Al' access lock on the access point of the vessel. Insertion of the key allows the door to be opened. With the door open the 'C' Key is trapped.

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