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Partial stroke testing
Partial stroke test reveals hidden ESD valve failures
Antwerp based leading global synthetics
company found that
>> Valves that performed spotless in full stroke tests 			
	 during stops got stuck during live process
>> These critical on/off valves would have remained 			
	 open upon request for an emergency shutdown...
Partial stroke testing
The case
>> To prevent overpressure in a large, 30 meter high 			
	 column, both of its inlet lines are equipped with ESD 	
	valves
>> The medium going through these valves was a 				
	 monomer with a temperature of up to 200 °C
Partial stroke testing
What happened?
>> Valves failed during partial stroke test, despite previous 	
	 successful full stroke tests
>> Valves remained stuck in their seats and could not be 	
	 closed during PST test
>> PST test revealed that the ESD valves could not be 			
	 relied upon...
Partial stroke testing
What was the reason?
>> Process heat caused the ball of the valves to expand 		
	 more than specified by the valve supplier
>> When medium started running through the valves, the 	
	 valve could no longer be shut
Partial stroke testing
Ball of the valves replaced as a result of partial
stroke test findings
>> Balls of the valves were replaced by balls with a 				
	 suitable 	expansion coefficient
>> More ESD valves equipped with PST systems as a 			
	result
>> Risks that had come to light were added to						
	 equipment malfunction database
>> ESD valves are still tested on a bi-weekly schedule
Partial stroke testing
More information
>> Read the full article
>> Check out the video on mechanical partial stroke 				
	testing
>> Find out more about mechanical partial stroke testing
Partial stroke testing

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Mechanical partial stroke test reveals hidden failures

  • 1. Partial stroke testing Partial stroke test reveals hidden ESD valve failures
  • 2. Antwerp based leading global synthetics company found that >> Valves that performed spotless in full stroke tests during stops got stuck during live process >> These critical on/off valves would have remained open upon request for an emergency shutdown... Partial stroke testing
  • 3. The case >> To prevent overpressure in a large, 30 meter high column, both of its inlet lines are equipped with ESD valves >> The medium going through these valves was a monomer with a temperature of up to 200 °C Partial stroke testing
  • 4. What happened? >> Valves failed during partial stroke test, despite previous successful full stroke tests >> Valves remained stuck in their seats and could not be closed during PST test >> PST test revealed that the ESD valves could not be relied upon... Partial stroke testing
  • 5. What was the reason? >> Process heat caused the ball of the valves to expand more than specified by the valve supplier >> When medium started running through the valves, the valve could no longer be shut Partial stroke testing
  • 6. Ball of the valves replaced as a result of partial stroke test findings >> Balls of the valves were replaced by balls with a suitable expansion coefficient >> More ESD valves equipped with PST systems as a result >> Risks that had come to light were added to equipment malfunction database >> ESD valves are still tested on a bi-weekly schedule Partial stroke testing
  • 7. More information >> Read the full article >> Check out the video on mechanical partial stroke testing >> Find out more about mechanical partial stroke testing Partial stroke testing