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  • Users: JimCasey
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  1. JimCasey

    steam shell pressure

    It seems that customers can never give me this information. I am looking for a way to calculate it with higher confidence than I have. Consider a tube and shell heat exchanger. The shell gets steam from a pressurized, saturated steam source. The steam is controlled by a valve before it is...
  2. JimCasey

    What about Ethanol?

    I try not to be cynical >BUT< I am not seeing a technical benefit to Ethanol. 1. It takes as much energy to make as it returns. There are precious few eco-hybrid tractors and combines out there plowing and harvesting the cornfields, but plenty John Deere Diesels. 2. Cars get poorer mileage so...
  3. JimCasey

    Butterfly valve torque

    A long time ago in a job far away, I encountered an analytical method for calculating the torque of butterfly valves. That library is no longer accessible to me and probably no longer exists. I believe that it was for non-offset discs anyway. Can someone supply or point me to an analytical...
  4. JimCasey

    Natural Gas Liquefaction

    Can anybody tell me where I can look up a reasonably representative schematic of a natural gas liquefaction process? The boss had some questions and the kind of stuff I am hitting on the web has more-than-vast oversimplification ( e.g.: two tanks and a pump) . Need a little detail; pressures...
  5. JimCasey

    Pump Startup Sequence

    My question is about the sequence used in starting a pump. My customer is using a vertical-shaft pump with a 6" outlet. 800HP motor The outlet piping goes through a check valve and an automated ball valve.Then the line rises 1100 feet. When they start the pump, the ball valve is closed...
  6. JimCasey

    NFPA 85

    I was just requested to state whether a certain valve meets NFPA 85 criteria. While we are busy ordering the standard, does anybody here know what the requirement would be for a 10" butterfly valve? Apologies for the lack of additional information, but this is the way the question was asked...
  7. JimCasey

    ATEX explosionproof circuit

    I am wiring a couple of ASCO Explosion Proof (ATEX EExd IIC IP67) solenoid valves. Two valves are mounted so the conduit connections are on a tee, with the third leg of the tee connecting into an explosionproof switchbox on a ball valve actuator. My question is: Do I need to use sealed cable...
  8. JimCasey

    History of the Valve Positioner

    I posted this last year, and got no responses. So I'm gonna' try again. 2 Feb 05 13:08 I am interested in finding out who offered the first valve positioner. The oldest literature I have seen shows the Moore 72. Positioners probably "evolved" more than just appearing in a flash of...
  9. JimCasey

    Zeta value

    My European affiliates have asked several times for Zeta values. It is supposed to be some sort of flow restriction index, but unlike the inverse of a Cv value, Zeta can be the same value for different sizes of valves. Can someone please enlighten me as to the definition of Zeta, and how I...
  10. JimCasey

    Valve positioner history

    I am interested in finding out who offered the first valve positioner. The oldest literature I have seen shows the Moore 72. These devices probably "evolved" more than just appearing in a flash of inspiration, and I'm really curious about the time-line.

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