Safety system justifies faith in valve operation
A
Netherlocks Safety Systems product story
Edited by the Engineeringtalk editorial team
Feb 14, 2002
A new safety system allows users to perform functionality and operability tests on actuator operated valves without production loss.
Valves used in ESD and HIPPS fail-safe procedures can get stuck because of not moving for a long period.
For this reason, these valves need to be tested on their functionality and operability every once in a while.
These tests require full opening or closure of the valve to make sure it works when it has to.
This results in a production loss.
The Netherlocks FAITH (fail action integrity test handling) system makes it possible to perform functionality and operability tests on actuator operated valves without production loss.
This is achieved by making it possible to open or close these valves partially, so that production can continue during testing.
Using the FAITH system, tests can be performed more frequently, not only during stops, and so production can continue during testing.
With a standard actuator-valve coupling, a mechanical device is integrated, which assures that the valve can be closed or opened for a maximum of 20 degrees, after insertion of a linear key.
This is enough to crack open the valve when it's stuck, but it won't affect the production.
The FAITH system is custom designed for each combination of valve and actuator, ensuring the required safety-factors and maintaining the accuracy of the 20-degree test.
The system has the option of an electrical switch which is activated by the insertion of the key.
This will signal the control room that the unit is in test mode.
Using a closure angle of 0 degrees, the device can also serve as a normal locking device for actuator operated valves, locking it in open or closed position.
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