Air eliminator failures in dispensimng facilities

[kenneth2]

Hello, I was part of a previous thread regarding ball floats crushing in Neptune air eliminators. We have a ball float probelm in an LC 8181A eliminator at an airport up north. After looking at past comments and a more in depth review of pressure build up in a closed system I am now convinced our problem is incorrect check/pressure thermal relief valves on the piping, which results in a closed piping loop with diesel fuel trapped inside. Calculations have indicated an enormous pressure increase even if the system is at -40 deg C at night, and heats up to -30 deg C in the day. The diesel wanting to expand in a rigid closed pipe section will exert up to 500 psi and higher with changes in temperature of 10 deg C. These balls are only good to 150 to 350 psi before they collapse. Any comments?

 

[BigInch]

Certainly possible.

That closed piping segment (as any piping segment possible to block in) should have a thermal relief valve to prevent exactly that from happening. Where is it?


**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[jmw]

Good information, it is a mechanism I hadn't been aware of or thought of, and a good point by BigInch.

JMW

http://www.ViscoAnalyser.com