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  1. eekman56

    Formula

    Can anyone tell me the formula for calculating sewer flow rate in a gravity oval sewer. What I'm working on is old gravity sewers in Newark, NJ. Combined sewer, some oval some teardrop shaped. I found circular and rectangular but nothing on oval and teardrop. Thanks.
  2. eekman56

    Entrained Air Issue?

    Sounds like a great idea. In fact I had read an article in pump and systems magazine where someone was having a similar problem and their solution was to inject water into the suction side which would help "push" the air through the volute. We will give it a try. Thanks all of you for your help...
  3. eekman56

    Entrained Air Issue?

    Artsi, The unit runs for about 15 minutes and is down for @ 40 minutes. The unit is designed for snoring applications however we have found that whenever we are pumping into pressure, ie forcemain, etc., the volute tends to get airlocked at the beginning but once its released, the air doesnt...
  4. eekman56

    Entrained Air Issue?

    Great idea Artsi. We will give it a try. What about the couplings? Do you think that the air is creating an unbalancing of the pump which results in the engine coupling coming under stress?
  5. eekman56

    Entrained Air Issue?

    I'm not sure why the couplings are tearing but it has to do with the application because of the failure happening to any pump we put in service. The pumps are Gorman Rupp Model PA6D 6" portable diesel trash pumps. We rent these for a number of different applications. The seal is in an oil...
  6. eekman56

    Entrained Air Issue?

    The priming chamber has a non-return valve which hold water in the chamber. The sight gauge on the seal oil is clear meaning there isn't any contamination. The couplings on the suction hose is Bauer which is a ball and socket fitting. We took the precaution of checking the O-rings and even...
  7. eekman56

    Entrained Air Issue?

    Hello. I have a diesel operated 6" trash pump. I'm pumping from a undergound chamber which is 17' deep, 23' long and 8' wide. A 36" line dumps into the chamber @ 6' from the top. My pump suction is located at the opposite end. Vacuum gauge reading when operating is 15". On the discharge side, I...

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