Checking Pump Performance (Dead Head Check)

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  • Опубліковано 23 гру 2024

КОМЕНТАРІ • 55

  • @patrickcarroll8247
    @patrickcarroll8247 11 місяців тому +1

    Love your video. Explains a lot on the pump curve.

  • @zacharydavis4398
    @zacharydavis4398 2 роки тому +3

    Thanks for spending the time to create and share this content

  • @laworder6092
    @laworder6092 Рік тому +1

    This is what I was looking for longtime and I found it thanks sir great explanation straight forward.
    Please could make video on NPSHr & NPSHa checking and calculation

  • @bobbyo1374
    @bobbyo1374 5 років тому +7

    Great video! Very easy to follow. Your other videos are just as good!

  • @chrisnorris1959
    @chrisnorris1959 2 роки тому +1

    Fantastic videos! Instant education I can use in the field tomorrow! Thank you!

    • @ZenHVAC
      @ZenHVAC  2 роки тому

      Great to hear! Let us know if there's a topic you want and we'll make it happen!

  • @karangadhvi7
    @karangadhvi7 2 роки тому +1

    Really appreciate the way of explanation , thanks 😊

  • @dj80d6
    @dj80d6 2 місяці тому

    anyway you have this in a pdf form to take out to job site?

  • @JohnnyJr396
    @JohnnyJr396 Рік тому

    Thank you. If I wanted to see what I’m actually pumping compared to a pump curve do I just take the head pressure?

    • @kirkpeterson1657
      @kirkpeterson1657 10 місяців тому

      You would use head pressure, but if the suction is a positive you need to subtract it from the head, if its a negative pressure, you would need to add it. Watch our pump performance video and let me know if it helps.

  • @levimust4479
    @levimust4479 5 років тому +2

    So, for a simpleton like myself, the general idea idea is to compare the psi of the sucking in side to the pushing out side of the pump? This video reminds me of many math /science class I took where you're given a set of steps to follow with no explanation of the underlying logic,

    • @kirkpeterson1657
      @kirkpeterson1657 5 років тому

      You are correct; these videos do not dive into theory; they are folks who need the base information "now"... like when a Technician is on a job site and just needs the answer, not the science behind it.
      For this test, the pump is moving no water with the discharge valve closed, so the pressure should line up with "0" GPM on the chart.
      The suction pressure needs to be subtracted so you are only checking the pressure the pump is creating, not the standing pressure of the system.

    • @ZenHVAC
      @ZenHVAC  5 років тому +2

      Thank you for the feedback Levi!
      Good observation on what is NOT included in our videos!
      The reason they're short and without theory or concepts included is they're what we call 'Explainer Videos' that are intended to give you what you need to get the job done in the least amount of time possible...like when your on a job site. That's whey we include the tag line - "What you need to know, when you need to know it, in ten minutes or less".
      We have plans for other video series that will include more background information that the Explainer Videos don't cover.
      Let us know what you would like to see and we'll make it and give you full credit for the idea!
      About the pump pressures...it's like when you calculate "Absolute pressure" by subtracting atmospheric pressure (14.69 psi) from "Gauge pressure" .
      Oh, and you can't be a simpleton when you ask questions like yours!

  • @czarlun01
    @czarlun01 3 роки тому +1

    Just gained additional knowledge.

  • @FaiqSaddiq
    @FaiqSaddiq 2 місяці тому

    is it possible closing the discharge valve while the pump is working?

    • @lufa1272
      @lufa1272 2 місяці тому

      Yes.but Slipper will fly from ur manager

  • @imitatioDei
    @imitatioDei 5 років тому +1

    I found this video trying to find information about PI and VK , found on the side of fuel trucks. So is this the PI or VK or both?...or neither

  • @snipp3t
    @snipp3t 2 роки тому

    What would be the inlet pressure if the pump is sitting open water, such as a submersible pump in a sump?

  • @driftless1870
    @driftless1870 Рік тому +1

    Phenomenal! Thank you.

  • @amandeepsingh4071
    @amandeepsingh4071 3 роки тому +1

    I got question for you! I am doing pump curves on new pumps most of the time and actual dead head pressure doesn't match with the given performance curve dead head(curve given by manufacturer)! I checked speed, and impeller size and new pump might not have worn seal or impeller. Is it possible to have air trapped in water system and it will give a wrong reading as air has low density!? its happening a lot! I am really confused and looking for solution to how to find if air in water system? or its something else causing problem! Please help me if you can. Thanks!

    • @ZenHVAC
      @ZenHVAC  3 роки тому

      You're right, air would skew your readings, but that isn't the culprit if the system has a standing positive pressure and the pump isn't at the high point of the system (the air typically is at the high point/s in the system) Can you give an example suction / discharge readings and the pump data? Also, if the pump has a VFD on it, be sure it's running at 60 hertz.

  • @hightekinc723
    @hightekinc723 3 роки тому +1

    Good video!

  • @rahulmaske2057
    @rahulmaske2057 2 роки тому

    How to check pump running as per pump performance curve..
    How to check head flow pressure

  • @guardianmn
    @guardianmn 4 роки тому +3

    i'm learning again. i like it:D

    • @kirkpeterson1657
      @kirkpeterson1657 4 роки тому +1

      Awesome, let us know what you want to see next and we'll make it happen!

    • @ZenHVAC
      @ZenHVAC  3 роки тому

      Glad to hear that!

  • @rahimys6135
    @rahimys6135 2 роки тому

    Does it need to divide the specific gravity?

    • @rahimys6135
      @rahimys6135 2 роки тому

      For psi (head in feet) pressure x 2.31/specific gravity

  • @mahanteshkedache393
    @mahanteshkedache393 Рік тому

    Excellent

  • @mohammedasifali3891
    @mohammedasifali3891 2 роки тому

    Sir I have a question, if it is a closed loop like Chilled Water Piping. The system shows a suction and discharge pressure while it is running. If we want to know the pump head(in feet)do we have to subtract Suction from Discharge Pressure(in PSI) and multiply by 2.31, please clarify thanks

    • @kirkpeterson1657
      @kirkpeterson1657 10 місяців тому

      Good question! subtract it if its a positive, add it if its a negative.

  • @nicholashenschel5541
    @nicholashenschel5541 4 роки тому +2

    If you have a negative psi on a CB, that is considered a vacuum and should be measured in inches of mercury HG. This will be more precise in your calculation

    • @kirkpeterson1657
      @kirkpeterson1657 4 роки тому +2

      Great question! Think of it this way; feet of head is like miles or kilometers, its a course measurement. Mercury HG is like millimeters or tenths of an inch.
      Which would you use to measure the distance between the North-Pole and the South-Pole; kilometers or millimeters?

  • @alswlapdl5351
    @alswlapdl5351 4 роки тому

    why do we need to subtract the suction pressure and discharge pressure?

    • @ZenHVAC
      @ZenHVAC  3 роки тому +1

      Good question! We subtract it because we want to see the true discharge pressure. Think of it like this; if you weigh yourself while you're holding a 30# jug of refrigerant, the weight will be off by 30#. It's the same reason we add the suction if it's a negative number. If you weigh yourself while someone is picking you up, the reading will be off. Hope that helps!

  • @soadsaad5350
    @soadsaad5350 3 роки тому

    Could you advise me about what is the max allowable time to perform the dead head time, as you say "I have to use the same pressure gauge " , So it will take around 3 minutes to install the gauge

    • @ZenHVAC
      @ZenHVAC  3 роки тому

      You're best to shut the pump off when moving the gauge. The other option is install a valve on each gauge port and tee them together, installing the gauge on the tee branch. That allows you to open the valve for the suction, then shut it and open the discharge gauge port valve.

  • @drrmagneto4176
    @drrmagneto4176 5 років тому +2

    i feel its danager to start thje pump when the valve is closed

    • @MrQarni1
      @MrQarni1 5 років тому +1

      I think this only applies to C. P PUMPS.

    • @ZenHVAC
      @ZenHVAC  5 років тому +4

      Keep in mind this check is for centrifugal pumps only, NOT positive displacement. You also do not keep the valve shut for more than a few seconds, just long enough to gather the zero flow pressure.

    • @ZenHVAC
      @ZenHVAC  5 років тому +4

      @@MrQarni1 You are correct! this is for centrifugal pumps only.

  • @razanaeem9490
    @razanaeem9490 4 роки тому +1

    Hi Zen team. Do you guys have a Facebook page or email where I can contact you for some questions I have regarding how to test a pump?

    • @kirkpeterson1657
      @kirkpeterson1657 4 роки тому

      Send the questions over to patrickpeterson@zenhvac.com

  • @amrelzeiny7838
    @amrelzeiny7838 3 роки тому

    Wonderful

  • @electron1012
    @electron1012 4 роки тому +4

    Wow and I just change capacitors and switches and leave🤣. Awesome

  • @mathumithar9200
    @mathumithar9200 5 років тому +1

    🔥🔥🔥🔥🔥

  • @briang1561
    @briang1561 4 роки тому

    I still don't know what dead head means.

    • @ZenHVAC
      @ZenHVAC  4 роки тому +1

      Sorry Brian, I should have explained that! The water pressure is measured in Feet of "Head", and when you close the discharge valve the flow is "Dead" so they use the term "Dead-Heading" the pump.

    • @AKK105
      @AKK105 2 роки тому

      why do we need to know the dead head?

  • @MR-nl8xr
    @MR-nl8xr 4 роки тому +1

    How come none the Engineers I've worked with have mentioned this test.

    • @kirkpeterson1657
      @kirkpeterson1657 4 роки тому +2

      Good question Max! Most engineers design systems assuming the individual components they select for the system will work as designed. While Engineers typically design systems to work properly, HVAC Technicians troubleshoot systems that once worked properly, but now do not work properly.