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APPLICATION: |
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A major international chemical company in New Jersey uses 3” air operated double
diaphragm (AODD) pumps with PTFE diaphragms to pump a highly aggressive chemical
through candle filters from an overhead tank. Part of the filtered chemical is
recirculated at 30 psi back to the pump’s inlet. |
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PROBLEM: |
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Rapid diaphragm failure was occurring in the AODD pumps. These pumps are
generally limited to a maximum inlet pressure of 10 psi when equipped with PTFE
diaphragms. As a result of the excessive inlet pressure, the PTFE diaphragms in
these pumps lasted only a few hours. |
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SOLUTION: |
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A BLACOH distributor was asked to find a solution to the rapid diaphragm failure
problem. After consultation with BLACOH, a decision was made to install a 5
gallon BLACOH SENTRY inlet stabilizer at the inlet to each AODD pump. The inlet
stabilizer acts as a shock absorber to cushion the water hammer pressure spikes
created as the pump’s inlet valves rapidly open and close. The SENTRY uses
compressed air, separated by a PTFE diaphragm from the process fluid, to balance
pump inlet pressure and provide a smooth and continuous flow of liquid to the
pump. |
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RESULT: |
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After SENTRY inlet stabilizers were installed, pump diaphragm life was extended
from hours to more than 6 months. The SENTRY inlet stabilizer paid for itself in
the first two weeks of operation. |
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