Recent content by saxman2u

let's say there is not another water tank, just a 50 foot piece of pipe connected to the tank that has 6 feet of water in it. If 100 GPM has a pressure drop of .25 bar or 3.63 PSI, can the pressure drop over the length of the 50 foot pipe be greater than the pressure at the orifice or the...

Thanks for the info. For your first iteration, are you using 2" copper pipe? Can you send me a link to chart that is similar to the one you are using so I can follow you better? Thanks.

This is great information. three questions: 1. is "assumed flow rate" that you mention in line item 1 the https://www.haywardflowcontrol.com/assets/documents/flowcontrol/pdf/VessFlow.pdf 2. For line item 4, pressure drop, is this friction loss or PSI loss across the pipe? 3. for line item 5...

Hi, I am trying to calculate how much water can flow with just gravity from water tank A to water tank B. Each tank as a 2" orifice on the side wall at the bottom. If water tank A is 100% full and water tank B is completely empty, if someone opens a 2" ball valve at the bottom of tank A, how...

This is great information. I am not sure about if the PVC is smoother than steel. I looked at a few different online calculators and they all came out to be the same. I did choose plastic/PVC as the material when using the calculator. There is a choice for 4" steel and the TDH is higher, so...

I have been using this online calculator: https://www.tuhorse.us/total-dynamic-head-tdh-calculator/ I agree with you about the valves and fittings, I usually add another 20% of linear feet to accommodate for this, thank you for bringing that up. I also agree with you on the 6" pipe and we do...

Yes, this all makes sense. On smaller properties, there is usually not enough elevation difference to get the tank that low. Remember, we are talking about tanks that are 30-40 feet wide, 30,000 to 55,000 gallon tanks. On some properties, the elevation is almost the same which makes it hard...

No, with these systems, rainwater catchment installers will install a valve at the bottom/end of the line close to the tank so that the client can empty the system after the rain event. We have actually developed a computerized or automated system that flushes the initial water that hits the...

Ok, I understand now. yes, using a common pipe to the tank. I redid my math, here goes: Pipe A should have 50 GPM at 106 linear feet which is .17 feet of head before it joins the next downspout. When the two pipes merge, now more head is going to pipe A, so it would be 100 GPM at 208 linear...

ok, I think I am getting it. Most tanks are at the same grade or lower than the house. In the attached drawing, pardon my chicken scratch, the tank is 2 ft below the house, and the downspouts are 7 feet tall. The pipe entering the tank is 8 feet tall, therefore, the differential (distance...

Thanks for the response. The picture is a good representation of some of our systems. Let's assume that 4" standpipe B has 20 GPM flowing into it, and at point C, there is 120 GPM in the line. Distance of C to D is 100' with no turns/elbows. Distance of C to B is 8 ft. Head loss at point C...

Greetings, Looking for the best way to calculate TDH for some rainwater catchment systems I am designing in Texas. Some homes we are installing these systems on have large footprints, between 6,000 to 8,000 sq feet. The large rainwater collection tanks we install range between 30,000 and...

Thanks for the reply. To answer your question, no, 15 feet or additional friction loss is negligent. It seems that the only situation where this would be somewhat beneficial to pump into the bottom of the tank is if the tank were empty. But, since the tank is filling with water, and...

Hi, I have a rainwater collection system where we have to pump water to the main cistern during a rain event. The system works great the way I have designed it and the rainwater is awesome to use in the house and water the plants and grass. The length of pipe I pump the water is almost 300...

Thanks for all of the information. I will report back after i install the parallel line within the next few weeks.