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  1. jboy

    What determines the set point of a PSV

    Can anybody tell me if there are certain rules of thumb used when determining the set point of a PSV. The reason i ask this is because i have recently come across the following situation. A heating medium system has a expansion drum operating pressure of 2.4 Bar. Yet the Psv are set at 8 Bar...
  2. jboy

    How much end float should i see

    During a factory test of a generator it was noticed a considerable amount of end float on the generator shaft (drive end). This was probably due to the fact that the generator was being diven as a motor (uncoupled) for test purpose and it was finding its Magnetic Center. Eventually a spacer...
  3. jboy

    Reynolds Number

    steven Your explanation of laminer flow is good. But i still do not understand what is to be an acceptable Reynolds number. Do we just accept any number. If this is so , why do we make the calculation and what is it telling us? Thanks J Boy
  4. jboy

    Reynolds Number

    In any engineering text, it states that a flow with a reynolds number of less than 2000 is of the Laminer flow and anything over 4000 is Turbulent flow. These figures are used for calcultion reasons. What i do not understand is when making calculations, figures of 40000, 60000 and 100000 and...
  5. jboy

    Exchanger Sizing

    svanels Thankyou for taking interest.In response to my question. I need to set a temporary cooling water supply to provide cooling water to two gas turbine units. Lube oil will be on one side of the plate exchanger, with fresh water being the cooling medium. I need to keep the oil at 60 oC. I am...
  6. jboy

    Exchanger Sizing

    Could anybody please point me in the right direction as of where to begin sizing exchangers. The exchanger would have oil on one side ,water on the other (plate type exchanger). I am looking for a general formula with a definition of all terms involved. Please note i have no past experience on...
  7. jboy

    CV

    If a control valve has a CV of say 300, with the valve fully open the flow is 800m3/hr. Does this mean that if the valve was only open 50%, the CV would be 150 and the flow would be 400m3/hr. At 25 % would the cv be 75 and the flow 200m3/hr and so on. Thankyou.
  8. jboy

    PSV's

    What is meant by the terms Thermal/Fire Relief when dealing with PSV,s. Thankyou.
  9. jboy

    Lift Pumps

    Can anybody please advise me on using a srew type pump as a lift pump. The question i need an answer to is probably a very basic one. Would a Srew type pump pick up is own suction if it was to be sitting above a level of liquid, or would it need to be primed first? Is thisthe same with all...

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