Thank you for this video series. Along with other sources, I've learned a lot about sprinkler design. at 10:20 you talked about wind disturbing the spray and one thing I noticed in that part of the video was that the sprinklers seemed to be over pressure and causing more mist. Other videos I've seen say that it is better to adjust the pressure (or flow rate?) so the spray heads produce larger droplets that are less prone to wind disturbance. Supposedly there should be a point where you don't have mist and the throw distance is close to the maximum range of the nozzle.
Curious - What is the pipe size, at the water source, where your shutoff valve is ( shutoff valve with the crescent wrench ) It looks like it is 1" pipe considering you have a 1 1/2" valve. Yes I saw your other videos too.
As I recall, the source pipe is 1" which means that the overall capacity is quite limited due to upstream friction loss at the source. The interplay of friction loss upstream vs. downstream (relative to the shutoff valve) explains why it was particularly necessary to adjust the shutoff valve to regulate the first pressure gauge to 30 psi for different flows, for this demonstration. There are real world situations where it is important to understand the capacity limitations of the water source.
Possibly. What I would be concerned about is not necessarily pressure loss (though there will be some pressure loss in the smaller pipe and fittings) but rather the flow rate through the smaller pipe. Plastic pipe manufacturers generally recommend flow rates no higher than 5 feet per second. If you approach that on the larger pipe, you’ll certainly well exceed that in the short section of smaller pipe. This can lead to pinholes and other failures in the smaller pipe.
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Thank you for this video series. Along with other sources, I've learned a lot about sprinkler design. at 10:20 you talked about wind disturbing the spray and one thing I noticed in that part of the video was that the sprinklers seemed to be over pressure and causing more mist. Other videos I've seen say that it is better to adjust the pressure (or flow rate?) so the spray heads produce larger droplets that are less prone to wind disturbance. Supposedly there should be a point where you don't have mist and the throw distance is close to the maximum range of the nozzle.
Excellent demostration
Hi Dr. Busey. Great example of a catch can audit. What would you recommend to an irrigation auditor should charge per sq footage or acre?
Great demo!
Great demo
Curious - What is the pipe size, at the water source, where your shutoff valve is ( shutoff valve with the crescent wrench ) It looks like it is 1" pipe considering you have a 1 1/2" valve. Yes I saw your other videos too.
As I recall, the source pipe is 1" which means that the overall capacity is quite limited due to upstream friction loss at the source. The interplay of friction loss upstream vs. downstream (relative to the shutoff valve) explains why it was particularly necessary to adjust the shutoff valve to regulate the first pressure gauge to 30 psi for different flows, for this demonstration. There are real world situations where it is important to understand the capacity limitations of the water source.
@@PhilBusey Indeed. Going from 1” to the 1 1/2” seemed to aid with less friction loss. Guessing this is a good practice for real world applications?
Great explanations. Thank u
Hi,
Pump delivery out put is 50mm, friction loss is more on 50mm so plannig connect 50mm to 76mm near to the pump, is there any issue on that?
Possibly. What I would be concerned about is not necessarily pressure loss (though there will be some pressure loss in the smaller pipe and fittings) but rather the flow rate through the smaller pipe. Plastic pipe manufacturers generally recommend flow rates no higher than 5 feet per second. If you approach that on the larger pipe, you’ll certainly well exceed that in the short section of smaller pipe. This can lead to pinholes and other failures in the smaller pipe.
perfect