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What were they thinking?
Designers are concerned with two things, friction loss and velocity. The sprinkler is most likely a 1-1/2 inch inlet, so all the swing joints can be assumed to be 1-1/2 inches, too. The average flow on a 1-1/2 inch golf sprinkler at 80 psi is about 38 gpm. We don’t know the inside diameter of a swing joint, but we will go with 1.5 inches, which is being generous. Doing the math, the velocity through the swing joint would be 6.9 feet per second (fps). Velocities in PVC pipe are supposed to be limited to 5 fps, but a 1-1/2 inch sprinkler on a single swing joint is common at that velocity on most course irrigation systems. It is also for an 18-inch swing joint. This swing joint is somewhat longer – hard to say but looks like 6 to 7 feet at a minimum in a straight line, not including the elbows. The higher velocity at the longer length as well as the turns will make the water very turbulent and add to the water hammer potential when it’s turned on and off.
The friction loss in a 1-1/2 inch, Class 315 pipe at 38 gpm is 3.67 psi per 100 feet. So at 7 feet that would be a friction loss of only 0.26 psi. That’s not very much, but that assumes there are no turns. The Rain Bird website – it’s a Rain Bird sprinkler and the color makes me think Rain Bird swing joints – says about 0.5 psi friction loss through their 1-1/2-inch swing joint. A normal swing joint has three turns; this one looks to have 25 turns, just a few more than necessary. So the friction loss through this mess is at least 4 psi, but given the configuration I am sure it is more like 10 to 15 psi.
Source: Golf Course Industry Magazine
2 Inch Pipe Gpm - Recent Articles
IntelliChem sensor flow requirement problem • Just Getting Started ...
Reading the IntelliChem documentation I see that that there is a need of a pressure difference between the input and output of the flow-cell, which is understandable of course. In the plumbing drawing it is advised to connect the input hose to the pipe between the pump and heater and the output hose after the heater. This allows for sufficient pressure difference apparently. I do not have/need a heater or solar, but only will have an IntelliChlor in the main pipe. Now the question is whether the IntelliChlor will create sufficient pressure difference for the flow-cell of the IntelliChem to work well. What I know is that the IntelliChlor only has some plates parallel to the flow direction, so I expect not a lot of flow resistance from the IntelliChlor. Or should I put a reducer (and inverse reducer) in the pipe to create some resistance, or even I am thinking of a bypass pipe with reduced size, say 1 or 3/4 inch compared to the main pipe of 2 inch, to connect the output hose of the IntelliChem....
Source: IntelliChem sensor flow requirement problem • Just Getting Started ...
Washington Post - Dec 31, 1969
Orange tape means 500 to 999 gpm, yellow means 1,000 to 1,499 gpm and blue indicates at least 1,500 gpm. A white band means the hydrant has been upgraded to a standard 4 1/ 2-inch nozzle but hasn't been flow-tested yet. If a hydrant doesn't have a band
Contracting Business - Dec 31, 1969
Greenpipe features a standard dimension ratio 11 (SDR 11) wall thickness, which is capable of delivering 4,000 to 6,000 gpm. The pipe's natural R-value of 1 — or more depending on pipe size and SDR — delivers potential savings iby reducing energy loss.
2 Inch Pipe Gpm
Creator: Carson Dunlop | Technology & Engineering - 2003 To help understand this, let's look at it this way: If we want to get 3 gpm out of the
end of the pipe, we have to put 3 gpm ... If we flow 3 gpm through that same '/2-
inch-diameter pipe but make it 200 feet long, we will lose 14 psi (we lost 7 psi in ...
Publisher: Dearborn Real Estate
Building Technology, Mechanical and Electrical Systems
Creator: Ben Stein | Architecture - 1997-02-18 2. The liquid velocity is constant over the cross- sectional area of the pipe. The
first of these assumptions is quite ... used in plumbing work are discharge rate in
gallons per minute, pipe diameter in inches and water velocity in feet per second,
Publisher: John Wiley & Sons
An Introduction to Fluid Mechanics
Creator: Faith A. Morrison | Mathematics - 2013-04-15 Piping is rated by its nominal size—for example, 1/2-inch or 3/8-inch pipe— but
the true ID is not the same as the nominal size. For water flowing in 1/2-inch,
Schedule 40 PVC (smooth) pipe at 3.0 gpm, calculate the average velocity and
Publisher: Cambridge University Press
Practical Heating Technology
Creator: Bill Johnson, Kevin Standiford | Technology & Engineering - 2008-08-28 If 21/2-inch pipe would be chosen, the velocity would be only 0.5 fps. This pipe
size would probably be too large to be economical. The total pressure drop in the
system can be found by using the 25 gpm and 2-inch pipe and looking at the ...
Publisher: Cengage Learning
Landscaping Principles and Practices
Creator: Jack Ingels | Science - 2009-01-09 The friction losses are for pipe lengths of 100 feet. For pipe lengths of less than
100 feet, the friction losses would be equivalently reduced. Example Given:
Water flows through 100 feet of 2-inch pipe at the rate of 9 gallons per minute.
Publisher: Cengage Learning
2 Inch Pipe Gpm
Sep 11, 2010 by doug | Posted in Engineering
This could vary over quite a wide range, depending on how much pressure you apply to the fluid in the pipe, what the fluid is and how long the pipe. Fairly common numbers for water might be around 0.1 to 1.0 gpm