STOP! Otherwise you may notice a drop in water pressure after the replacement is made. If you don’t have a storage tank the Initial Design Flow will be the same as the Maximum GPM you measured using the “Bucket Method”. PSI stands for pounds per square inch.

If you design your sprinkler system to exceed these flows some really bad things can happen. Copper pipe is often soldered to the fittings. Do this only as a last resort, when there is no other reasonable way to get water for your sprinkler system. Divide the capacity of the full tank in gallons by the time it takes in minutes to fill the tank.

You would tap in for the sprinklers after the water meter. Read the PSI from the gauge. Do it right the first time! You must measure both inflow and outflow, and design based on whichever is LESS! Then the cost savings on sprinkler parts will seem trivial.

This one has a rather unusual model of pressure regulator (the gizmo with the white adjustment knob on top) to reduce the water pressure.

PEX is quickly becoming the default tube for piping new homes due to low cost and ease of installation. The water pressure in PSI can be determined by multiplying 0.433 times the height (feet) of the tank above the yard. Old paint buckets work great. In most cases I choose to ignore the small section of pipe. Therefore, if the plants only cover half the actual ground area, you only need half the water. In my 30-year-old neighborhood, most of the homes have now had to replace the water supply pipes to the house due to scrubbing damage caused by sprinkler systems installed back in the bad old days before any of us realized the dangers of high flows. Example: A 200 gallon tank fills in 10 minutes. There’s a pretty good chance that all kinds of crud are in the water such as algae, sand, mineral deposits, fish, snails and clams. Enter the meter size on your Design Data Form. The Maximum Available GPM Table gives you the maximum SAFE flow.

But this causes the pressure at the homes at the bottom of the hill to be too high. This is probably not practical, so you may need to do a bit of guessing and adjust your test results accordingly. If your Maximum GPM was measured at 20 GPM, and your Tank Inflow GPM was 18 GPM, your Initial Design Flow will be 18 GPM because it is lower than 20 GPM. If you do not have a water storage tank skip down to the section titled “Pressure Head”. It’s one of those abstract hydraulic principles I told you about that are hard to understand. Cold Winter Climates:  In colder climates the water line often enters directly into the basement or crawl space under the house from underground. You need to find the water supply pipe and measure it’s size. You then add the friction loss for both pipes together to get the “mainline friction loss”. What if instead of tapping into the copper pipe, you decide to tap into the PE pipe out in the yard before it switches to copper? Copper Tube. However… Simply measure the time in seconds it takes to fill a 1 gallon container from the pipe!
Avoid measuring the flow from a small valve such as a hose bib, as the valve may substantially reduce the flow.

This water pipe to the house is often buried very deep to keep it below the frost line. If not, the tank won’t help, so skip down to the next section. Maximum Available GPM Table (Maximum Safe GPM).

So if you are replacing a 3/4″ copper tube with PEX, you should consider using 1″ size PEX tube for the replacement. Brass is not very common except for short sections of pipe, due to cost. Enter your Design Flow on your Design Data Form.

With drip irrigation you only water the area the plant foliage actually covers. They may give you a pressure range, like 40-60 PSI. Warning: your water system may already have a pressure gauge installed on it. Is that water hammer???

Galvanized pipe is often found on homes in inland areas, especially on less expensive tract homes. You might want to write this down on the Design Data Form so you don’t forget! Try probing the ground with a pitchfork, metal rake, or screwdriver to find the hard cover of the box. <<< Previous Page ||| Tutorial Index ||| Next Page >>> At this point you should make at least a preliminary decision as to where you want to tap into the house water supply pipe for the irrigation system water. With a higher velocity the problem becomes much worse. You need to either forget you ever read them or do not continue. Consider reducing the amount of lawn and replacing it with shrubs. It will help your faucets, pipes, washing machine, dish washer, etc.

Eventually it wears away enough that the pipe develops a leak.

Often copper is used under concrete slabs and then it converts to PEX for other locations. Make sure it is a good quality brass-body pressure regulator. Typically, the closer you can tap to the point the water enters your property, the better. The worst thing you could do right now is to try deciding what sprinkler you want to use. Double check that all the water so water is turned off and not flowing in the house pipes. Do NOT design your system based only on system outflow, which often exceeds inflow. Contact. The first of these is called “water hammer”. If you don’t have a meter, enter 0 (zero).

Pipe noise!!! Still pretty simple! Get a one gallon container, and time how long it takes to fill it with water.
The pressure regulators are generally set to someplace between 50 and 65 PSI. (Be sure to install a drain valve after the shut-off valve to drain the water out of the irrigation pipe during freezing weather!) If you would prefer a pdf version see PDF Design Data Form.

Thanks, Lourdes Tags: None. ?The test is simple. Terms of Use    This height is the elevation difference, not the distance away. Time how long it takes to fill the tank.

Joe will need to calculate the friction loss in both those pipes and add it together to find out his “mainline friction loss”. Strip away any insulation, so you can get at the pipe and wrap the string around it. I’ve no idea what kind of water system you have, but it seems that most likely it will be some type of gravity flow system, so here’s some information about gravity flow systems.

If you don’t have a meter, there will almost always be a shut-off valve at the point your house water line connects to the water provider’s pipes. If you don’t know the tank capacity in gallons you will need to find it. Gravity flow is tricky, this is not going to be an off-the-shelf irrigation system.

So pressure regulators are installed on the water supply pipes to homes in the lower areas of town, where the pressures are very high. Now on with the tutorial. (It wasn’t officially sold in the USA until 1985. That’s all there is to it, it’s very easy to do! I have no idea how it got in there. PEX is almost always made to conform with CTS sizes. Step #2 will show you how to modify these values to reflect your actual flow. Maybe the plumber didn’t want to drill a larger hole in the wall for the pipe.

This page was generated at 08:55 AM. There is also a PDF version of the Sprinkler System Design Data Form.

Most pressure regulators are adjustable, so the water company has no idea what pressure the regulator is set at. Example: The one gallon container fills in 5 seconds. You will make the adjustment, if needed, later in step #2. (60 divided by 5 equals 12 gallons per minute.). you need to use ONLY this tutorial. You do not want to go above 120 or you will blow those two sizes of pipe out really easily. S. I”. After all, that higher flow could save some serious money on sprinkler parts! Administrator . This is just an advanced warning so you won’t be surprised when you need to change the flow later. Ask them for the “static water pressure” for your neighborhood.

(No kidding!) If you have a pressure regulator, consider if it would be better to tap before or after it. Wow, isn’t that “cosmic”!).

If you want to try using a higher flow than recommended above, then go to. You should probably consider installing a filter of some type on your system if the water is from a river, stream, pond, or lake. Add this buffer GPM to the old Tank Inflow GPM to get the new higher Tank Inflow GPM. Joe isn’t worried about how to calculate the friction loss because Joe knows that he will learn how to do it in Step #3 of the tutorial! If you’re using one of those design-it-yourself brochures or websites all bets are off! Tank elevation is 70′ higher than the yard. If you still can’t find it, call your water company and request their assistance. Hopefully the tank is on a hill, or a tower or some other elevated location. Warning: PEX pipe has a very thick wall, thus it has a smaller inside area for the water to flow through. A little scrubbing may take 20-30 years to create a leak.

That would be “putting the cart before the horse”. Irrigation Glossary    Now shut off the flow out of the tank completely. After the copper pipe enters the house it quickly branches off in multiple directions and becomes smaller, but this doesn’t matter to you, because you have already decided that you are going to tap your irrigation system into the 1″ copper pipe right where it enters the house. (Okay, no doubt some hot shot out there wants to argue with me. Irrigation Tutorials Home   

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