Accurate test of safety valves according to the latest safety regulations.
- Safety regulations require to test the operation of
safety valves with a predetermined interval. These
so-called stroke tests are to be executed in order to
determine if the safety valve is able to perform its
safety function (open or close) within the time
allocated for this.
- Stroke tests are usually executed by giving open or
close commands on the DCS system and plant staff
monitoring the actual time the valve opens or
closes in the field, sometimes using stopwatches.
- An (unplanned) upset in the production process
usually also requires safety valves to operate.
- It may therefore also be used to reset the test
interval, provided the actual time the valve used to
perform its safety function (travel time) has been
- This is however difficult to achieve during a
- Using the open and close limit switch signals it becomes possible to calculate the actual time between
the shutdown command and the completion of the safety function of the safety valve.
- These signals are recorded in the data historian system and are used in an application which calculates
the travel time of the valve.
- The Magion Application Framework was used to create a web application which shows an overview of all
valves tested, their actual travel time and the allocated travel time.
- Various test results of the same valve can be viewed to determine the performance of the valve through
- Operations and maintenance personnel can add remarks and determine if the valve should be sent for
repair before it is no longer able to perform its designated safety function.
- Calendar functionality has been added to the application which enables operations and maintenance to
schedule stroke tests of valves within the predetermined test interval.
- Reminders are sent via e-mail if and when a valve needs testing.
- Accurate time measurement of the travel time of the safety valve, without the need of personnel in the field.
- Every time the safety valve has operated is recorded.
- Clear overview of the performance of each and every safety-valve through time.
- Knowing which valve needs maintenance before it fails in an emergency situation.
- The valve test interval is automatically adjusted during planned stroke tests and unplanned upsets, preventing
unnecessary stroke tests.