I designed and built a burst tester to pressurize at a rate of 80-100 PSI/Second using water. The system is controlled by an analog feedback loop that regulates the pressure gradient. The old tester, uses a diaphram pump and pulses pressure until vessel failure. Problem: On the old tester, I am getting failures at 700+- PSI. The new tester is getting failures at 500+- PSI. Both units are testing vessels from the same batch of PolyPro plastic and the same press at the same time, from the same process. Why the difference in failure pressures? I would have thought that the pulsing would have failed at a lower rather than higher. I was wrong. Can anyone assist me.

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Pressure Vessel Testing

Thread starter ClintUS
Start date Jul 13, 1999

Status: Not open for further replies.

Jul 13, 1999

ClintUS

Mechanical

I designed and built a burst tester to pressurize at a rate of 80-100 PSI/Second using water. The system is controlled by an analog feedback loop that regulates the pressure gradient. The old tester, uses a diaphram pump and pulses pressure until vessel failure. 
 
Problem: 
On the old tester, I am getting failures at 700+- PSI. 
The new tester is getting failures at 500+- PSI. 
 
Both units are testing vessels from the same batch of PolyPro plastic and the same press at the same time, from the same process. Why the difference in failure pressures? 
I would have thought that the pulsing would have failed at a lower rather than higher. I was wrong. Can anyone assist me.