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  1. M

    Catia this giant

    DEAR MECH ENGINEERS CAN I ASK YOU whats the rank of catia between other softwares such as solid works and solid edge and pro eng and inventor and if its possible tell me is catia the most effieicnt between them and is it enough for any mechanical engineer or its like other software has...
  2. M

    Chilled water pumps

    why is it recommended to use a 1450 rpm pump with a bronze impeller for pumping chilled water to the chillers ?
  3. M

    Stainless steel pipe selection

    dear friends i have an application for pumping system it consists of 3 parallel pumps having a max head of 8 bars i have a stainless steel pipe has 8" diameter and sch 10 will this be suitable to be used under this pressure ?
  4. M

    How to study this kind of flow ?

    boneh3ad i know the NSE can be applied to all systems on the earth but here how can we apply it ?? in cartisian co-ord. or we will use the polar co-ord. and in the redius direction or in the angel direction i think its complicated , i have studied this case and get an equation for flow using the...
  5. M

    How to study this kind of flow ?

    my friend i mean which theory will be presentable to study the flow from up to the bottom ??
  6. M

    How to study this kind of flow ?

    how to study this kind of flow ?? how will the water flow from the upper volume to the second one ??
  7. M

    Hydraulic total pressure

    my friend we always here neglect secondary losses like fittings and valves but length no and also it depends on the length ur talkin abt
  8. M

    Hydraulic total pressure

    because u give the pump electric power and it transimits it to hydraulic power thats the reason YURI
  9. M

    Damn centrifugal pump

    i am very sorry for unclear description but the original pump in the manual was 2.2 kw has q=12m3/hr and H = 20 m the new pump they put is 10hp q=20m3/hr and H= 40 m and while its operatin on the machine it gives 25 meter head only not 40 the sitiuation now is that i have searched for these...
  10. M

    Hydraulic total pressure

    russ_watters EXCELLENT
  11. M

    Damn centrifugal pump

    accordin to my last to posts here i found this special pump which has materials designed to carry a high press but the problem now i found a pump on the machine is bigger than the one in the manual so shall i buy the pump from manual or as the existing pump ?
  12. M

    Pump question

    yes ur very right u know the pump has high Hms and Hmd but normal Hm and the pump will give speed to water yes correct i think its an ordinary pump not special pump because these 10 bars after operating the pump it will reduced by the value of vacum created by pump impeller do u faced...
  13. M

    Pump question

    so the pump is a normal pump ???
  14. M

    Pump question

    tell me guys whats the relation between Hms and Hmd and the pump selection for example i have Hms =10bar , Hmd =12 bars so Hm =2 bars so the Head of the pump is only 2 bars or its said that pump has a head of 2 bars and can withstand 12bars ???
  15. M

    Pressurized centrifugal pump

    thanx edgepflow so the pump selection will be a normal pump but the materials of casing and impeller should withstand this high pressure
  16. M

    Pressurized centrifugal pump

    dear guys how are u ?? i ve a problem with selecting a centrifugal pump for circulating water in a closed system this system consists of tank , pipes up to 60 meters with 2 inch dia , then these pipes deliver water to a tube contains pressurized nitrogen @ 10 bars then return back to tank and...
  17. M

    Difference btn flows in a circle vs. rect.

    the majority of piping systems specially in liquids using round pipe to make the flow is smoother and reducing eddy losses also because of the hydralic diameter and also case of pipes fittings it will be easier to work on a circle than a rectang
  18. M

    Determining pump height

    and remeber also this equation is also used to draw the system curve of the pumping system and the intersection between it and the pump curve is the operating point
  19. M

    Determining pump height

    yes man its correct and its a form of bernoulis equation
  20. M

    Determining pump height

    Hm = Hst + losses losses is defined as constant * Q^2 and u have Q = 12 L/S AND d = 3/7 " so sub in this o.8 * f * L * Q2/gD^5 you will find it a very small term because Q is small so finally u can consider that H pump = H st + 3 or 4 meters but H static should be taken into...
  21. M

    Strange bearings

    hello everyone i am a maintenance engineer in old factory so while we were working on an old machine yesterday we found a very strange gear box like the harmonic drives but it transmitts the motion from the motor shaft by a key to bearings those bearings transmitts motion to a elliptic shaped...
  22. M

    I am a new user of ansys 12 and i dont know if this program is

    i am a new user of ansys 12 and i dont know if this program is excellent or not but i think it will take me a long time to learn it so guyz do u find it great program or not ?
  23. M

    Help heat transfer

    so what if i changed the shell and tube with another plate exchanger or what if i connect another exchanger in series with it ??
  24. M

    Help heat transfer

    i have a system consists of a shell an tube exchanger and a centrifugal blower the blower suction is at the exit of the exchanger i want to replace the shell and tube with a multi plates heat exchanger whats my conditions for this process BLOWER 0.03 m^3/s max press 16 bar and SHELL...
  25. M

    Mechanical engineer

    mechanical engineer :D or :S well i am a mechanical engineer in a factory my job is maintenance of different machines so i am dealing with many mechanical systems also dealing with air compressors pneumatic circuits , hydraulic circuits and air chillers i deal with many things may be...
  26. M

    Shell and tube exchanger

    hello guyz i have some questions about shell and tube exchangers 1- whats the difference between shell and tube exchanger over the plate exchanger ?? 2- whats the data required for selecting heat exchanger ?? 3- if i will replace the shell and tube with a plate exchanger whats the...
  27. M

    2 identical parallel centrifugal pumps ?

    but the pump head is very high for this application
  28. M

    2 identical parallel centrifugal pumps ?

    but u know there is a phase in the flow in pipes nammed syphon ?? can it be this problem ???
  29. M

    2 identical parallel centrifugal pumps ?

    well i have also check those valves
  30. M

    Centrifugal blower ?

    thanx for your very simple answer :D can u tell me i need more information about blowers where can i get it ???
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