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Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
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4160V Solid grounded system
I agree with DPC a solidly grounded medium voltage system is a bad idea. According to the NEC, the ground wire needs to be sized so it is protected by the circuit protection available. If you have a three wire load and ground fault protection you can reduce the size of the ground wire if the...- pkelly54
- Post #10
- Forum: Electric power & transmission & distribution
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Leakage Question
All valves leak - although the leakage of many properly operating valves is insignificant for real world applications. There are industry standards addressing valve seat leakage. Organizations such as the Manufacturers Standardization Society, Fluid Controls Institute, and Instrument Society of...- pkelly54
- Post #3
- Forum: Valve engineering
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Pressure increase in solar heating system
The pressure increase is a function of the expansion of the liquid and the pressure required to compress it. From the steam tables compare the change in specific volume of saturated liquid for the two temperatures in question. From the table of the compressibility of water one can obtain the...- pkelly54
- Post #2
- Forum: Pipelines, Piping and Fluid Mechanics engineering
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what is the difference between pressure relief valve and safety valve?
The difference is generally in capacity and setpoint. A relief valve is ment to relieve pressure to prevent an over pressure condition. A relief valve may have an operator on it to assist in opening the valve in response to a control signal. A safety valve is ment to relieve pressure without...- pkelly54
- Post #2
- Forum: Valve engineering
