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  • Users: HeshamM
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  1. HeshamM

    Jockey Pump Flow Rate?

    If I have a 1000 GPM @ 14 bar Main Fire pump, does 10 GPM at such high pressure sounds O.K.? I feel it is too little
  2. HeshamM

    Split Case vetically mounted Vs Vertical In-line

    I am talkilng about 200 kw and above. Why we can say that, for example, to remove the impeller in the split case vertically mounted pumps you don't have to remove the motor unlike the vertical inline where you have to remove the motor. Also for the bearing/seal maintenance you had to do the...
  3. HeshamM

    Authority of Butterfly valve when used as control valve

    Dear anergri, I meant valve authority which expresses the ratio between pressure drop across the control valve compared to the total pressure drop across the whole circuit. The formula to calculate valve authority is, N= ?P1 / ?P1 + ?P2 Where, ?P1 = Pressure drop across fully open control...
  4. HeshamM

    Authority of Butterfly valve when used as control valve

    For cooling and heating coil applications, globe valves are usually used as a control valve as their performance curves meets the coil curve to get a resultant of a valve linear operation, which means when you close the valve 10% it reduces the flow by 10%. In this case the authority of the...
  5. HeshamM

    SCADA Vs BMS (BACNET)

    As a mechanical engineer, when it comes to the BMS/Ethernet/100bps/Modbus/VPN... I feel helpless. However, What I meant with BMS is the Building Management System with Dirict Digital Conrollers connected on the automation level through Ethernet/IP connection. I know that Scada system with PLC...
  6. HeshamM

    Split Case vetically mounted Vs Vertical In-line

    Now days, can we still say that Split case vertically mounted pumps are easier to be maintained over the vertical in-line pumps. What are the other advantages and disadvantages which allow you determining which is better for your application? Application: Chilled water systems
  7. HeshamM

    Authority of Butterfly valve when used as control valve

    When trying to install a two-way control valve of 450mm size and larger, we usually end up using motorized butterfly valves (globe type is very expensive). The application is chilled water system, Plate Heat Exchanger. Does valve authority matters when using BF valves for flow control application?
  8. HeshamM

    Lowest Condenser Temp is the better?

    Is it true that the lowest condenser temperature you can get is the better for the chiller efficiency? Or below certain temperature there will be no benefits to the efficiency?
  9. HeshamM

    Jockey Pump Flow Rate?

    To calculate the flow rate of the jockey pump, it is related to one sprinkler flow rate and the leaking rates as per the figures in the NFPA (at design stage it is not possible to get that actual), would 10% considered a correct value or is it too much?
  10. HeshamM

    SCADA Vs BMS (BACNET)

    In the application of district cooling plants, which system is better to control and monitor the process of producing chilled water and the distribution on the buildings Heat Exchanger Rooms. SCADA or BacNet BMS system?
  11. HeshamM

    AutoCad: How to minimize the file size

    I always face a big problem when working on the Solid Modeling projects on AutoCad, the size of the file gets bigger and bigger with all the details I add, is there a way to minimize this file size?
  12. HeshamM

    AUTOCAD - File Size

    I am facing a problem with the size of the AutoCad dwg files when working on the solid modeling, specially when the number of details increase. Beside purging is there any other way to minimize the size?
  13. HeshamM

    Large Butterfly Valves Liner

    poppeye, before the hammering, the pipes were aligned and inspected. They did use chainfalls to get the pipes aligned but this is normal practice for large pipes. The other contractor was excavating without considering the existance of this branch line. The welded branch connection was damaged...
  14. HeshamM

    Large Butterfly Valves Liner

    poppeye, our case is as follows: we are using large diameter replaceable EPDM liner valves (up to 1500 mm) for a buried chilled water network, the valves are located in valve chambers. We faced a situation where some contractor hammered on the branch pipe connected to the main (where the valve...
  15. HeshamM

    Flexible connection alignment

    Thanks Oldiar, I will keep checking with different manufacturers.
  16. HeshamM

    Control Valves - Large sizes - Authorities

    SAK9, you are totally right about the application. Butterfly valves charactaristic is linear! does that mean it will not work efficiently in cooling systems. And regarding the coil, does the cooling coil have the same charactaristic of plate heat exchanger? they don't. Plate heat exchanger have...
  17. HeshamM

    Flexible connection alignment

    Does anyone know any standard for the allowed tolerances of aligning a flexible connection in piping systems?
  18. HeshamM

    Control Valves - Large sizes - Authorities

    When trying to install a two-way control valve of 450mm size, we usually end up using motorized butterfly valves (globe type is very expensive). Does valve authority matters when using BF valves for flow control application?
  19. HeshamM

    Large Butterfly Valves Liner

    Large sizes butterly valves' liners can be either replaceable or vulcanized. Does anyone have any experience in both? Which is better?
  20. HeshamM

    Expansion tank failures

    I discussed this matter with proffessional manufacturers and most of them confirmed that although they design the bladder type expansion tank to be vertically mounted, for the large sized they prefer if it is horizontally mounted. Of course, you will still have the space problem.

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