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  1. POLYENGMOR

    intermediate Point Vent

    Hello, @Latexman : Velocity is 1,5m/s @LittleInch : It is a forced pipe (or a discharge line should I say ?), flowing left to right. My goal is to size triple function air relief valves that allow the evacuation of air when filling the pipes, air entry when emptying the pipes (or breakage)...
  2. POLYENGMOR

    intermediate Point Vent

    @LittleInch : The blue line is the profile of the pipe The yellow line is the profile minus 3 meters The magenta line is the hydraulic head The principle is whenever you have more than 3 meters between the profile of the pipe and the hydraulic head, you need to put an air valve.
  3. POLYENGMOR

    intermediate Point Vent

    Hello, Here's the profile : https://files.engineering.com/getfile.aspx?folder=ae18ca31-1742-4090-adba-4b49f3940db3&file=IP_SIZING.jpg
  4. POLYENGMOR

    intermediate Point Vent

    Hello, First of all, excuse me if I don't use the right vocabulary. I am currently working on updating the calculation of high point vents/low point drains of a 1000mm pipe (drinking water), the pipe has already been commissioned. In the calculation, there is an intermediate point vent...
  5. POLYENGMOR

    Block thrust design for a tee

    Thank you everyone for your answers. @JStephen: The clearance is due to upcoming works on the other side of the branch, the block thrust is temporary. Restrained joints are not available at the moment. @HTURKAK: I made a mistake calculating the branch load, the test pressure is 30 bars, then...
  6. POLYENGMOR

    Block thrust design for a tee

    Hello fellow engineers, I need to design for an ongoing project a block thrust for a tee (steel). The problem is I don't have enough space for a classic concrete block thrust, so I need to design some kind of special block thrust (like a pulling one or made of reinforced concrete or an I beam)...
  7. POLYENGMOR

    Connecting force main to gravity main

    Hello fellow engineers, I work on a project where I need to connect a force main to a gravity main via a manhole (attached drawing). https://files.engineering.com/getfile.aspx?folder=dd88b395-1b61-4caf-b5fd-6ca3aca97f4e&file=manhole.JPG Is this design correct? Are there any rules I need to...
  8. POLYENGMOR

    How to deal with careless technicians ?

    @dik : I do but they don't seem to care at all. Also, they have way more experience me than so I think they already know what needs to be done (5 vs 30 years).
  9. POLYENGMOR

    How to deal with careless technicians ?

    Hello fellow engineers. Please excuse my English, not my native language. I'm a civil engineer and currently I manage a team of technicians for the production of what we call in my country "execution studies" which are majorly shop drawings. The problem is that two of them are careless and...
  10. POLYENGMOR

    Boss was expecting me to become an expert in 6 months.

    How is a business degree going to help me in this situation?
  11. POLYENGMOR

    Boss was expecting me to become an expert in 6 months.

    Hello fellow engineers. Please excuse my English, not my native language. I'm a civil engineer who has been working for 6 years now. For the 5 first years, I have been working as a "studies engineer" for a construction company specialized in a "niche" construction sector. During those years, I...
  12. POLYENGMOR

    NPSHA calculation (low value)

    The lowest level of the water in the canal: 102m Level of the pipes in the pumping station: 93.7m
  13. POLYENGMOR

    NPSHA calculation (low value)

    Actually, the (new) pumping station is supplied by two sources, a canal, and a dam. The water level in the dam is high so we don't have a problem with the NPSHa calculation. Also, these two sources supply a nearby existing pumping station. The size of the inlet pipe changes a few meters before...
  14. POLYENGMOR

    NPSHA calculation (low value)

    The length of the inlet pipe is 600m, the nominal diameter is 1200mm. Actually, I found out that the head loss I used in my calculation (16m) is the maximal head loss between the canal and the entry of the water plant (with Roughness Coefficient k = 1mm), not the entry of the pumping station...
  15. POLYENGMOR

    NPSHA calculation (low value)

    Thank you @LittleInch for the complete answer. @HTURKAK: The thing is the head loss has been calculated by the client but I will look into it for sure, thanks.
  16. POLYENGMOR

    NPSHA calculation (low value)

    Below the full calculation : Level of the pump (m) 93,7 Lowest level in the canal (m) 102 P atm (Pa) 98500 P vpa (Pa) 4242 Hf (Friction head loss) (m) 16 M*g (995*9,81) 9760,95 Hst (m) 8,3 Hf (m) 16 Hvpa (m) 0,43 Hatm (m) 10,09 NPSH (m) 1,96
  17. POLYENGMOR

    NPSHA calculation (low value)

    @1503-44: The friction head between the canal and the entry of the pumping station is already calculated, it is 16meters.
  18. POLYENGMOR

    NPSHA calculation (low value)

    Well, I am just trying to find out what I did wrong in my calculation and learn from it.
  19. POLYENGMOR

    NPSHA calculation (low value)

    That's it, 3 x 1 standby. Flowrate 384 LPS per pump (total 1151 LPS), I didn't need this value in the calculation of NPSHa. Regarding the other data (Pipe sizes, lengths, elevations, fittings, valves...), are these useful to calculate the friction head or the NPSHa because the friction head is...
  20. POLYENGMOR

    NPSHA calculation (low value)

    Hello fellow engineers, Excuse me for the lack of information in my first post. My goal is to choose the right pump for the pumping station. Below is a more detailed schematic : Below is the information I used to calculate the NPSHa : The lowest level of the water in the canal: 102m Level...

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