Quick Fix Guide www.netherlocks.com/support
4
How are valve interlocks used?
The main functions of valve interlocks are to:
> Enforce a predened valve operating sequence
- Create a safer working environment
- Save costs and prevent production spill or loss due to
incorrect switchovers
> Guide operators safely through strict work procedures
Some common applications for valve interlocks are:
Pressure Safety
Valves
To guarantee that only one relief
valve can be oine/in maintenance
Pig launching and
receiving
To guarantee the closure door can
only be opened when the vessel is
depressurized, free from toxic
gasses and isolated
Decoking
To guarantee safe change over from
cracking to de-coking of the furnace
Inert gas systems
To prevent that inlet and outlet of
tank are closed at the same time
Pump startup
To guarantee that during startup
suction valve is open
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