Thanks for watching! If you have ANY questions or concerns about your water/wastewater system you can leave a comment, call our experts at 855.329.4519 or you can live chat with them on our website: RCWorst.com
Thanks for the great explanation. I want to make sure I've understood it correctly, and I also have a few questions. We live on an 11-acre property that a developer wanted to subdivide. The developer drilled a well, intending it to be a community well, but it only delivers 10 gpm, and was not suitable to supply 11 houses. We bought the property from the developer and used this well to supply our new house. The well is 800' deep, has an 8" casing, and delivers 10 gpm. The submersible well pump is set at 300' The static water level is at 30'. It is 80' from the wellhead to the pressure tank inside the house The difference in elevation between the wellhead and the house is only 10' (the house is 10' higher than the wellhead). The well has 1" poly pipe. Question#1: If we never consume more than 10 gpm, and the flow rate of the well is 10 gpm, will there still be a drawdown from the static water level? Question #2: Without taking into account any additional head from possible drawdown, or friction losses from fittings, I calculate my head to be 270' (distance from well pump to static water level) +10' (difference in elevation between the wellhead and the house) + friction loss of 300' of pipe in the well + 30' of pipe between the static water level and top of the well + 80' of pipe between the well and the pressure tank in the house. So this would be 270' + 10' = 280' of head + the friction loss of 30'+80' of poly pipe. Am I correct about this? Question #3: If a 1hp, 10 gpm pump is used, but only a 3/4 hp, 10gpm pump is needed because of the amount of TDH, will the overly powerful pump be at risk of damaging its bearings from upthrust, because the head pressure is not adequate to keep impeller of the more powerful pump from banging into the top bearing when the pump turns on? Thanks for any answers to these questions.
Great questions, Q1: Only seasonal changes would likely effect the static water level in the instance you described. Q2: You are correct other than accounting for friction loss in fittings. Q3: I will refer to my own made up analogy, a pump is like a shoe, you don't go to large or to small for optimal and reliable performance. We are more than happy to help you size and select a pump if you contact us.
What about if you have loop. Say you have a 5ft of vertical lift, a 10 foot horizontal run into an open tub and then you also have a 5 foot vertical drop and a 10 foot horizontal run back to the start? Does the 5 foot drop negate the 5 foot lift entirely? Partially? Not at all? Does it somehow ADD to the total head?
I have been very curious as to why Head is given as a distance? Is head simply the extra distance that would be needed to overcome by the pump or pressure from point A? Is that why its given in meters? My question stems from the definition of head loss specifically. Head loss as we know is the pressure lost due to the friction in a pipe. But I am confused as to why its units is meters specifically. From my understanding the reason is friction causes the fluid to lose a certain amount of distance when traveling at a certain velocity and this distance lost must then be overcome by extra pressure from point A? is this correct?
Depending on the fluid in question, head can be directly converted from distance to the pressure gradient. It is important to stress that this conversion is for the pressure GRADIENT and not merely pressure at a given point.
My problem is we have a submersible pump 5HP and the tank is about 150 mtrs up sloping(head). What best size of pipe to use to maximize the pump capacity or discharge. Thanks.
Hi sir, I have a question. How we can calculate the head of a pump when that pump is higher than its consumers?For example,, the pump is on the roof and pumping water for domestic buildings. Thanks
The static head would be considered the same magnitude as at when you elevate but with a negative value because the reference plane is taking at x=0 at the center of the pipe. So your total head loss or total dynamic head would be Tdh=sh+dh+fl with static head negative
Thanks for your informative video. To calculate elevation, would the lower point be where the pump is set or where there is the static water line ? Thanks
Mahavir: That is a great question. You want to measure from the pumping level. The pumping level is the lowest water level reached during pumping operation. (Static level minus drawdown)
OK! Lets see if I understand this correctly. If my pump has a 50 ft lift and the water is only 5ft down below ground and my intake hose/pipe is 5 ft below the water level. I would still be able to pump the water 40 ft ft up above the ground level. Please crrect me if wrong. If I do not need to lift the water up the 40 ft, and instead I have to move it for a short distance , Would this affect my psi and flow rate?..If I had to move the water over a long distance then I would have to use the chart for friction loss. Thank You for the great video and information. Just trying to learn and apply it to practical use. Again Thank You. @@RCworstwater
Hi there can make video for how to choose booster and pipe line and calculate friction loss , when i want transit water from main tank in desert to the city, if elevation is 270 meter and distance is 69 kilometres and i want put water 550 gallon per minute UK gallon. In my city tank.
Does friction loss get accounted for in the length of pipe (drop pipe?) that is going down the well since that is already getting counted somewhat in the lift/elevation part of the equation? Meaning if the pump is hanging higher or lower in the well, I need to increase or decrease both elevation and total length of pipe that is causing friction loss.
What if the pump is situated above a tank will that be called as negative head or something and also how the head of the liquid fuels can be determined in an rocket engine as the pumps are situated above the combustion chamber in which the fuels have to be pumped
Suction lift is the term for a pump that pulls water from a lower elevation. I have not dealt with rocket fuel pumps recently, that may be a question for NASA.
Some systems have a certain flow rate requirement in order to operate properly. So maintaining a pump at a desired discharge pressure helps ensure this is done properly. Also if a pump is not pumping at a desired/required pressure, possible indication of something wrong with the pump or equipment upstream or downstream of it.
My question is if height of a building is 40 meter and pumping system is placed at the ground level What will be pressure reading at the suction of the pump and at the discharge of the pump
Hello R.C. Worst & co, great channel well done for putting these videos together. Is pump head the same as suction. Max-head and max suction. Many thanks in advance.
Hey Wayne! Suction Lift refers to the difference in elevation measured from the pump's inlet to the water level, and only applies to surface pumps. Think of it like the pump is sucking water straight up out of a cup (well/lake) with a straw (pipe). For shallow well jet pumps, the maximum suction lift is about 25', deep well jet pumps can lift from over 100'. Max head refers to the maximum amount of pressure (PSI) a pump can produce, and is a characteristic of ALL water/wastewater pumps. Thanks for the question!
Not a bad video but it is always a better video if you give a real world example with actual numbers. For the lift, why is there not a difference of head based on pipe size? Surely lifting a 2" diameter column of water a foot takes less force (ie less pressure) than lifting a 6" diameter column of water a foot. I would think a calculation that takes into account the specific gravity of the fluid (ie water) with the volume of water that would be lifted. Maybe this is just for "simple" applications per the title, but lifting a 1" diameter column of water 100 feet cannot be the same as lifting a 16" diameter column of water.
Thanks for the comment! The diameter of the pipe is only needed to account for friction loss, the pressure at the bottom of your 1" dia. and 16" dia column are exactly the same -> 43.29 PSI (ignoring friction loss). That is the pressure the pump must be able to produce to push water out regardless of pipe size. You can learn more here: www.rcworst.com/Shared/content/mfr/a_y_mcdonald_mfg_co/docs/a_y_mcdonald_pump_basics.pdf
Thanks for watching! If you have ANY questions or concerns about your water/wastewater system you can leave a comment, call our experts at 855.329.4519 or you can live chat with them on our website: RCWorst.com
Sir I have a question,plz reply me..
What is the reason of suction line pipe size is bigger than the delivery line pipe??
How to calculate flow rate if head and pressure given
very clear and simple explanation, thank !
Thanks for watching!
Thanks so much for the clear explanation. It was a big help
Glad it helped!
Thanks for the great explanation. I want to make sure I've understood it correctly, and I also have a few questions. We live on an 11-acre property that a developer wanted to subdivide. The developer drilled a well, intending it to be a community well, but it only delivers 10 gpm, and was not suitable to supply 11 houses. We bought the property from the developer and used this well to supply our new house. The well is 800' deep, has an 8" casing, and delivers 10 gpm. The submersible well pump is set at 300' The static water level is at 30'. It is 80' from the wellhead to the pressure tank inside the house The difference in elevation between the wellhead and the house is only 10' (the house is 10' higher than the wellhead). The well has 1" poly pipe.
Question#1: If we never consume more than 10 gpm, and the flow rate of the well is 10 gpm, will there still be a drawdown from the static water level?
Question #2: Without taking into account any additional head from possible drawdown, or friction losses from fittings, I calculate my head to be 270' (distance from well pump to static water level) +10' (difference in elevation between the wellhead and the house) + friction loss of 300' of pipe in the well + 30' of pipe between the static water level and top of the well + 80' of pipe between the well and the pressure tank in the house. So this would be 270' + 10' = 280' of head + the friction loss of 30'+80' of poly pipe. Am I correct about this?
Question #3: If a 1hp, 10 gpm pump is used, but only a 3/4 hp, 10gpm pump is needed because of the amount of TDH, will the overly powerful pump be at risk of damaging its bearings from upthrust, because the head pressure is not adequate to keep impeller of the more powerful pump from banging into the top bearing when the pump turns on?
Thanks for any answers to these questions.
Great questions, Q1: Only seasonal changes would likely effect the static water level in the instance you described. Q2: You are correct other than accounting for friction loss in fittings. Q3: I will refer to my own made up analogy, a pump is like a shoe, you don't go to large or to small for optimal and reliable performance. We are more than happy to help you size and select a pump if you contact us.
What about if you have loop. Say you have a 5ft of vertical lift, a 10 foot horizontal run into an open tub and then you also have a 5 foot vertical drop and a 10 foot horizontal run back to the start?
Does the 5 foot drop negate the 5 foot lift entirely? Partially? Not at all? Does it somehow ADD to the total head?
I have been very curious as to why Head is given as a distance? Is head simply the extra distance that would be needed to overcome by the pump or pressure from point A? Is that why its given in meters? My question stems from the definition of head loss specifically. Head loss as we know is the pressure lost due to the friction in a pipe. But I am confused as to why its units is meters specifically. From my understanding the reason is friction causes the fluid to lose a certain amount of distance when traveling at a certain velocity and this distance lost must then be overcome by extra pressure from point A? is this correct?
That's a good question, here's a link to an excellent article that I think will answer your question: www.pacificliquid.com/pumpintro.pdf
Depending on the fluid in question, head can be directly converted from distance to the pressure gradient. It is important to stress that this conversion is for the pressure GRADIENT and not merely pressure at a given point.
My problem is we have a submersible pump 5HP and the tank is about 150 mtrs up sloping(head). What best size of pipe to use to maximize the pump capacity or discharge. Thanks.
Hi sir, I have a question. How we can calculate the head of a pump when that pump is higher than its consumers?For example,, the pump is on the roof and pumping water for domestic buildings. Thanks
The static head would be considered the same magnitude as at when you elevate but with a negative value because the reference plane is taking at x=0 at the center of the pipe. So your total head loss or total dynamic head would be Tdh=sh+dh+fl with static head negative
Does the discharge pressure of the pump equal to the total dynamic head (TDH) required by the system ?
Pump head 107-45, what does it mean?
Thanks for your informative video. To calculate elevation, would the lower point be where the pump is set or where there is the static water line ? Thanks
Mahavir: That is a great question. You want to measure from the pumping level. The pumping level is the lowest water level reached during pumping operation. (Static level minus drawdown)
OK! Lets see if I understand this correctly. If my pump has a 50 ft lift and the water is only 5ft down below ground and my intake hose/pipe is 5 ft below the water level. I would still be able to pump the water 40 ft ft up above the ground level. Please crrect me if wrong. If I do not need to lift the water up the 40 ft, and instead I have to move it for a short distance , Would this affect my psi and flow rate?..If I had to move the water over a long distance then I would have to use the chart for friction loss. Thank You for the great video and information. Just trying to learn and apply it to practical use. Again Thank You. @@RCworstwater
Hi there can make video for how to choose booster and pipe line and calculate friction loss , when i want transit water from main tank in desert to the city, if elevation is 270 meter and distance is 69 kilometres and i want put water 550 gallon per minute UK gallon. In my city tank.
Does friction loss get accounted for in the length of pipe (drop pipe?) that is going down the well since that is already getting counted somewhat in the lift/elevation part of the equation? Meaning if the pump is hanging higher or lower in the well, I need to increase or decrease both elevation and total length of pipe that is causing friction loss.
Yes, because friction loss and elevation are two separate components of the equation.
What is the worst in case low head
I need help sizing a sewage ejector pump
"Friction Loss Calculators" - could you please share this file? I am not able to download, seems so the download link is not there anymore
Sorry about that! Here is a decent one: bit.ly/32v9RoB
Dear Sir.Thank you for the video.Please advise .My question is that elevation still get in to tatal head if the pipe is close loop?
Yes, it is
This was awesome!!
What if the pump is situated above a tank will that be called as negative head or something and also how the head of the liquid fuels can be determined in an rocket engine as the pumps are situated above the combustion chamber in which the fuels have to be pumped
Suction lift is the term for a pump that pulls water from a lower elevation. I have not dealt with rocket fuel pumps recently, that may be a question for NASA.
What is free delivery head in a pump? How can delivery head be zero even when there is flow through the pump?
Hello you mention you can have a desired pressure what does this mean exactly
Some systems have a certain flow rate requirement in order to operate properly. So maintaining a pump at a desired discharge pressure helps ensure this is done properly. Also if a pump is not pumping at a desired/required pressure, possible indication of something wrong with the pump or equipment upstream or downstream of it.
My question is if height of a building is 40 meter and pumping system is placed at the ground level
What will be pressure reading at the suction of the pump and at the discharge of the pump
Static x
Love dub
Make clip on calculation of flow rate, head, power requirment, friction loss, roar dynamic head
Subscription links are not working.
How do i convert pump pressure to head? I see two ways people are using P x 2.31 or pump differential x 2.31?
1 PSI = 2.31 feet of head
Is it better to use pump differential or just gauge pressure?
Hi, how much head loss would a filter sock add to a pool pump setup?
It depends on the size, micron rating, and flow rate. Generally though they are sized to lose less then 1 or 2 psi.
1psi=2.31 feet when i use water, what about using other liquieds, like disel for example?
hosam s just multiply by the specific gravity
thanks
do you have any animated power-point presentations?
Not at this time.
Hello R.C. Worst & co, great channel well done for putting these videos together. Is pump head the same as suction. Max-head and max suction. Many thanks in advance.
Hey Wayne!
Suction Lift refers to the difference in elevation measured from the pump's inlet to the water level, and only applies to surface pumps. Think of it like the pump is sucking water straight up out of a cup (well/lake) with a straw (pipe). For shallow well jet pumps, the maximum suction lift is about 25', deep well jet pumps can lift from over 100'.
Max head refers to the maximum amount of pressure (PSI) a pump can produce, and is a characteristic of ALL water/wastewater pumps.
Thanks for the question!
Thank you, that makes it clearer. first time working with pumps. i will watch many more from your channel.
The PDF link is not working
Thanks for the heads up! I changed it, here's the new link: www.rcworst.com/Shared/content/mfr/a_y_mcdonald_mfg_co/docs/a_y_mcdonald_pump_basics19.pdf
Not a bad video but it is always a better video if you give a real world example with actual numbers.
For the lift, why is there not a difference of head based on pipe size? Surely lifting a 2" diameter column of water a foot takes less force (ie less pressure) than lifting a 6" diameter column of water a foot. I would think a calculation that takes into account the specific gravity of the fluid (ie water) with the volume of water that would be lifted. Maybe this is just for "simple" applications per the title, but lifting a 1" diameter column of water 100 feet cannot be the same as lifting a 16" diameter column of water.
Thanks for the comment! The diameter of the pipe is only needed to account for friction loss, the pressure at the bottom of your 1" dia. and 16" dia column are exactly the same -> 43.29 PSI (ignoring friction loss). That is the pressure the pump must be able to produce to push water out regardless of pipe size. You can learn more here: www.rcworst.com/Shared/content/mfr/a_y_mcdonald_mfg_co/docs/a_y_mcdonald_pump_basics.pdf
👍
This was not a simple explanation..
Thanks
You're most welcome!