what size is my irrigation pipe

This 5 ft/sec threshold is a simple method of selecting pipe size, but a better method is to use allowable pressure losses due to friction and elevation change and to include protections against water hammer and pipe movement in the trenches (blocking). Turn the water at the irrigation control box off 2. Tubing. There are standards for schedule 40, 80 and 120 PVC pipe. This 5 ft/sec threshold is a simple method of selecting pipe size, but a better method is to use allowable pressure losses due to friction and elevation change and to include protections against water hammer and pipe movement in the trenches (blocking). “Pulsing” irrigation • Wanted to look at more frequent but shorter irrigation regimes to save water – Previous research funded by New Crops Opportunities Grant – NRCS funded ConservationNRCS funded Conservation Innovation Grant for 2010/2011 • Tomatoes and pppp ,eppers, blackberries and blueberries Drip irrigation tubing and drip irrigation fittings are the basics of any drip irrigation system. K. Filters for Drip Irrigation Systems 10 L. Drip Irrigation System Pressure Regulation Valves 11 M. Laterals 11 N. Drip Emitters 12 O. The 5 inch pipe is desirable as a stronger axle where the system operates on a side hill or on undulating ground. C 1" 1/2" opper pipe size PVC or galvaniz1 size ed pipe 3 /2"1" /4" MEASURE WATER FLOW3 /4" 3 WATE R PRESSURE (PSI) 35 LB. While PVC pipe (Image 2) is probably more familiar to most people than poly pipe, it's generally not the best choice for irrigation systems. Couplers are female fittings with threads on both couplers.. Tees are couplers that join three sections of pipe or tubing. The hole should go through the cladding, the frame, and the pond liner. Shop PVC Fittings. The edging is 44'x18' with flower beds ~4' wide (at their widest point) What size should my red pipes be and what size should the blue pipe be considering that the copper pipe that comes out of the wall is 1/2"? Understanding PIP and IPS Pipe Sizing Both are industry standards. Because schedule 40 PVC and schedule 80 PVC pipe have the same outer diameter, you can use schedule 40 PVC fittings with schedule 80 PVC pipe and vice versa. It can be used as mainline tubing, but remember that it cannot be over 30 feet in length or supply more than 30 GPH. ½ inch PVC pipe (three per bed for a 10 ft bed for an example giving you approx. SKU#: 60097102. The outside diameter is from outside edge to outside edge across the pipe. B. Pipeline Size/Pressure Loss: Calculate the pressure loss in a pipe with evenly spaced outlets, such as a sprinkler lateral or a manifold, or minimum pipe size in the same based on the maximum allowable pressure loss. ¾” 2 GPM - 22 GPM (120 GPH - 1320 GPH) 125 PSI. That is the distance across the middle of the pipe, not including the thickness of the pipe walls. This measurement is called the … ft. per sec. This is called dry line (or dry pipe) shock. The trash plugs up siphon tubes, gated pipe gates, and sprinkler nozzles. Most residential drip irrigation designs use some combination of PVC pipe, 1/2" poly tubing and 1/4" emitter drip line tubing (sometimes called spaghetti tubing). Comparable 1" Poly pipe is rated to withstand 100 PSI. Keep the pipes at least 2 inches apart. The fittings (where pipes are joined together) for PVC are rated at 450 PSI. Compare. MFG#: 29021. PIPE DRAGLINE P/ROLL 25MM 30M 10 Y. 40. H = jet height in inches. A great way to save money on an irrigation project is to use PVC pipe for the laterals, or the pipe between the valves on the main water line and the sprinkler heads. = 5.68 CD2 H Cu. Why don't you offer those smaller sizes instead?" If you use PVC pipe I recommend you use “200 PSI” pipe rather than that labeled “SCH 40.” For polyethylene pipe use the type called “irrigation” pipe or … Your #1 source for drip irrigation tubing at affordable prices! What size is the service line? It is important to use the appropriate size pipe for your flow rate. If you’re in doubt as to the proper sizing, consult with an irrigation specialist to ensure you’re using the right size. Thread size. The actual exterior diameter of a 3/4 inch PVC pipe is not 3/4 inches, but rather 1.050 inches (2.67 cm). All tubing is … View. 150. When choosing what kind of pipe to use … This chart is based on the most recent pipe standards and informaion supplied by pipe manufacturers. An easy way to do that is to wrap a piece of string around the pipe, measure the string, and use the table to the right to convert the string length to pipe size. Read on to learn more about what to consider when choosing pipe fittings for irrigation applications. When all zones are of the same size, pipe sizes and system cost will normally be minimal. It is fairly common for the meter to be one size smaller than the feed pipe to the house. But in terms of area, the inside area of these size pipes (water supply tubing) is a difference of about 56% greater. This is a design for a pool heating collector from Matthew that uses half inch plastic irrigation pipe for the absorber and 3 inch diameter PVC pipe for the manifolds. ¾” 1 GPM -15 GPM (60 GPH - 900 GPH) 80 PSI. Typical water meter sizes are: 5/8″, 3/4″, 1″, 1 1/2″. MAIN LINE SIZE 1/2" 3.5 5.0 6.0 6.5 7.0 7.5 8.0 9.0 9.5 3/4" 7.5 9.0 10.0 12.0 13.0 14.0 15.0 16.0 17.5 1" 10.0 11.5 13.5 15.0 16.0 17.5 18.5 20.0 21.0 80. While not as strong as PVC, it is still capable of working within 200-300 psi (again, plenty for most homes). Unlike PVC pipe, polyethylene tubing is “nominally sized”. Two years ago I had a burst pipe so apparently they didn't do a great job either. Reducing water waste and ensuring its effective distribution and use has to be our main consideration when it comes to irrigation. While irrigation experts recognize that both types of pipes work, there are some notable differences. I mainly use 12 inch spacing. If you have multiple sources or POCs, the cursor will turn into a pickbox and you'll be prompted to select a source. This can make it difficult to explain to a novice; however, by following the installation steps properly when installing an irrigation system, one will avoid inevitable problems and service calls in the future. DON’T GUESS. The current practice is to determine pipe size through two numbers: 1) the pipe bore (or diameter) and 2) the pipe schedule (or wall thickness) – though these two numbers can be configured in slightly different ways depending on the specific pipe used. Total Piping Solutions, Inc. is happy to help you choose the product that best suits your needs for any pipe size. To find your pipe size measure the circumference of the pipe with a string or a flexible tape measure. Poly Ethylene Pipe. The two pump categories should be looked at separately since the basic principle of operation of each is different. Below is our extensive PVC pipe fittings guide with a series of diagrams and dimension charts. To avoid any breaks the pressure rating of the pipe should be about double the actual water pressure. 45 LB. Gravity only. To match the size of the irrigation pipe to your existing water service, you'll need to determine the size of your incoming supply line. Irrigation water from open ditches carries trash that blows in, grows in, washes in, and collects in the ditches. Insert an ell or connection which came with the swing joint riser. The most common size of main line drip tubing is also called 1/2" mainline drip tubing. Add all of these together that will be running on a single zone to find out how many gallons of water your system will require. FHT inlet, MPT outlet. Install an Irrigation System. 1. In the corner we are using a plain elbow and a small piece of pipe to attach a threaded T junction. He designed his entire house with oversized lines to every fixture 3/4″ which were fed from 1 1/4″ copper mains. 1-1/2" x 25’ Flexible PVC Piping. Try and find out where the problem in your irrigation pipe is. Poly has the benefit of being more flexible while still maintaining a high level of strength sufficient for most residential irrigation system. A SWMM watershed model existed for the site, which had been calibrated to a one-year continuous flow record in the ditch at the site of the proposed stormwater storage pond. This measurement should reach from the very edge of the outside of the pipe to the very edge of the opposite side. Polyvinyl chloride (PVC) and polyethylene are the two most common types of pipe used for traditional irrigation systems. IPS– refers to plastic pipe that has the same outside diameter as iron pipe of the same nominal size. Typically made of polyethylene, the lateral lines branch off of the main line to supply the plants with water, either through sprinkler heads or emitter components. Because these pipes do not need to hold as much water as the main line, their diameters commonly range between 3/8 and 3/4 inch wide . Measure the length and compare it to the chart below. Use the formulae: Gal. Now, there are many sizes of 1/2" drip tubing and almost none of them actually measure 1/2". Fortunately, there are many different types of PVC pipe fittings so that you can run pipe in pretty much any configuration. Detach the old straight, stiff pipe that attached to the main PVC water line. PIP– is an industry size designation for plastic irriga-tion pipe. Determine the Flow Rate Air release valves open to release air when the system is turned off, and close up when water runs through the pipes. Can I use a hose with a quick connect from the spigot ( ) to the manifolds ( ) which I plan to remove during the winter? Measure about halfway up from the bottom of the bed in a visible but out-of-the-way location and drill a 1 1/8" hole. Pipe Schedule Considerations Maximum Allowable Pressure Loss: psi kPa feet of … I don't want to use an electric pump. lateral pipe also acts as an axle for wheels midway between the sprinklers. F/X Irrigation menu, Size Mainline Pipe option or type MainLineSize in the Command line If you only have one water source or point of connection (POC) in your drawing, the Mainline Size dialog box will open automatically. For example larger friction losses in a pipe going downhill may be allowable or even desirable. Generally, when PVC is used for irrigation system piping, SDR-PR pipe is preferred, because of the uniform pressure ratings for all pipe sizes and because pressure ratings for SDR-PR are higher than those for schedule pipe in the larger sizes. 3 Insert T pieces at sprinkler positions. In irrigation terms, a pumping rate of 2 L/s is a very low flow and would be applicable to nurseries with misting jets, vegetable growers using drip irrigation, and domestic irrigation situations. Pipe Outer Diameter Chart. For other pipe sizes and heights of jets. application. Locate where the leak is coming from – may have to dig down with shovel so use caution 3. It is the most used size by professionals and that size … 60 LB. Irrigation demonstration at Miami Dade College Kendall Campus shows that smaller pipe size diameter causes reduced water pressure. Flow Rate In The Pipe: lps gpm cfs acre-in/day acre-in/hour acre-ft/day cms. Meter & Street Service (inches) Building Supply & Branches (inches) Maximum Allowable Length (feet) 40. Fixture Unit Table for Determining Water Pipe & Meter Sizes. Pipe material. Also, don’t lay a ruler across it and use that measurement. Wrap Teflon tape around the end of the ell. Plastic Epoxy coated steel Cement asbestos Galvanized steel New steel Aluminum with couplers 15 year old steel. DON’T GUESS. Centrifugal pumps consist of one pipe inserted into the water column at a shallow depth, usually no more than 25 feet. Flush Caps and Flush Valves 13 SECTION 3: DESIGN REQUIREMENTS 14 A. Sectioning 14 B. Emitter Number and Placement 15 C. Uniformity Standards 18 D. Pipe Size and Length 18 70 LB. Gated pipe has a long life cycle (10 to 40 years), whereas flexible pipe is typically used only one or two seasons before it must be replaced. 3-Way PVC Corner Fitting. We believe in the .700 size. Global: 3/4" FHT X 3/4" MPT Pressure Regulator. Then find the pipe size whose calculated circumference is closest to your measured circumference. Method 3. of 3: If your project requires stiffness and strength, use large diameter pipes. You can put several pipes side-by-side in the same trench to avoid digging several trenches. Product Code: 800-025-030. We offer drip tubing in 1/8", 1/4", 1/2" and 3/4" sizes. Step 1 - Locate the Problem. Types of mainline pipe:PVC Plastic. PVC pipe is the default pipe used for irrigation systems throughout the western and southern areas of the USA and is also used in most other temperate climates.PEX tubing. PEX tube is now used in place of polyethylene mainlines in most places and is now used extensively for plumbing inside buildings.Metal pipe or tube. ... I nstalling an irrigation system is a great way to keep a lawn green through even the doggiest days of summer. Compare. Elbows are couplers with a 90-degree turn.. Bushings are used to convert from one size to another. the optimal pipe size and configuration that connected the stormwater pond to the existing irrigation system that did not require a pump (i.e., gravity flow). It must hold up under constant pressure. Pipe. In fact, to achieve the same pressure rating as PVC, the walls of poly would have to be 2 times thicker. Irrigation Frequency: maximum interval allowed between irrigations. Pipe Fittings Irripod Cam Lock Fittings, Polypropylene Irripod Fittings & Accessories Irripod Tubing Pods Sprinklers, Risers, Regulators Tapping Saddles Pumps & Accessories Filters Flanges Flow Meters Pressure Gauges Pressure Switches Priming Pumps Pump Control Panels PVC Fittings PIP Schedule 40 Surface, Gated Pipe Sprinklers Big Guns Its rigid composition and lack of flexibility can make it difficult to work with, especially in applications where curves and corners require a … Pipes for Every Irrigation Method. The 3-way corner fitting splits pipe into three directions and is designed for use in corners. Slip on couplings, tees, elbows and garden hose adapter based on your configuration setup. Put a riser in there and attach a pop up sprinkler in the middle. For help with determining what size irrigation pipe is best for your system, contact the irrigation experts at Irrigation Outlet. With many fittings regularly available, including slip, threaded, and push fit, the configuration options are endless. You may be able to dig up a small area, and examine that section, to establish whether the clog is higher or lower. 2. Black roll pipe is somewhat more difficult to install, but not appreciably so. You will also need to make the edges of the pipe slightly rough. All plumbing pipes and fixtures are a part of this system including your sprinklers and other irrigation equipment. DIG: 3/4" Pipe Thread Adjustable Pressure Regulator (FPT x FPT) FPT inlet, FPT outlet. Before you apply the glue, clean the pipe thoroughly using some cloths, making sure not to get the area wet. Always check the pipe O.D. Protect your system with air release valves. Irrigation companies charge $50-$80 for this in my area and are notoriously unreliable. This item is restricted for shipping in the following locations. THICK WALL HOSE CLR 20MM P/M. It can depend on several variables, including the size of the contaminants of the water, the end use of the water (ie. To find your GPM requirements, look at the gallons per minute each of the sprinklers in your system will need. “For multiple inlet rice irrigation, or border irrigation for soybeans, our recommendation is to go with the higher quality, 9- to 10-millimeter plastic piping.” Irrigation specialist Jim Thomas at Mississippi State University in Starkville, Miss., recommends the 6- to 7-millimeter size for transfer pipe running down a grade, such as down an open ditch or a flume pad. Micro-tubing is commonly used to describe ¼” tubing. 5 0 LB. The industry “rule of thumb” is that the pipe should never be smaller than the sprinkler inlet, although there is no technical reason for that. The standard 1" PVC pipe used for lawn sprinkler systems is rated to withstand 200 PSI. To do so, get a piece of string and wrap it once around the water pipe. The shallow well pumps use a single pipe to draw water from about 25 feet. 1. per min. The standard laying length of Irrigation PVC pipe is 20 feet. PVC is available in 20-foot lengths of rigid pipe that needs to be connected by a coupler or fitting. I want to increase the psi as some sprinklers require 40 psi. Pipe Length: mm cm m ft in. The air in the pipe will be quickly voided through the heads, causing those abnormal velocities that damage pipes, heads and component parts. As another example let’s compare 1 1/2″ pipe to 2″ pipe. If you use PVC, the typical diameter of the pipes is between 1/2 inch and … Parts list: ¾ inch PVC pipe (buy in 10 ft. sections for 10 ft long raised beds, 8 ft. for 8 ft raised beds, etc) You will only need one of these per bed. A. If your line break is in a poly pipe that is usually used for lateral lines, expose 1 to 2 feet of the pipe length and remove 2 to 3 inches of soil on either side of the pipe section. • If the first number is "4" then the fitting is Sch. As an example 1 1/4″ is only 25% larger than 1″. 8 inch 80 PSI P.I.P. 60. Pipe 6" through 27" in diameter are produced in accordance with the Natural Resources Conservation Service NRCS 430-DD specification and dimensionally comply with Annex A1 of ASTM D2241. To use the graphic above, first take a measuring tape and measure the diameter of the pipe at the center. The lateral pipe is typically either 4 inch or 5 inch diameter, with some systems using 5 inch close to the mover and 4 inch further away. and outside diameter (O.D.). When you install a sprinkler system, you might use PVC or polyethylene piping to deliver water to the sprinkler heads. Plugged tubes, gates, and nozzles cause skips and poor water distribution, and force irrigators to recheck their water sets often. Schedule 40 is the standard class plumbing pipe for residential and commercial potable water services. I have a garden faucet on a 1/2" pipe, from which I plan to run PVC pipe to 2 Rain Bird 3500 sprinklers at 20 and 60 feet away (and are down grade slightly from the garden faucet). It is fairly common for the meter to be one size smaller than the feed pipe to the house. You should then remove the end of the irrigation pipe which is nearest to the clog. Then find the pipe size whose calculated circumference is closest to your measured circumference. To ensure your garden doesn't drown in moisture, add an overflow. A typical 15 GPM system using 1” PVC pipe loses about 6 PSI for every 100 feet of pipe. Divide the circumference by pi, or about 3.14159. Funny you ask because we tested this. Preset and/or Max PSI. Pipe Size Estimate. 80. Normally a single pipe leaves the pump and moves through the property to deliver water out of the risers to the irrigation bays. I have the option of supplying my sprinklers with either a 3/4 inch or a 1 inch water supply line. Whether your irrigation line system is in the surface, subsurface, or elevated category, there is sure to be a suitable pipe for you here at Reinders. We spent a day with pro installers, who taught us how to pull pipe, make solid connections faster and get it done safely. My target is 45 psi. When you install a sprinkler system, you might use PVC or polyethylene piping to deliver water to the sprinkler heads. If you use PVC, the typical diameter of the pipes is between 1/2 inch and 2 inches . The right size pipe depends on the overall capacity of your system. The psi is generated because the pipe runs up a moderately steep grade maybe 400 feet. The beauty of this raised bed is that it's self-watering. The basic concept though is that if your pipe is too small when you are pumping water, then over a distance you will find that your system doesn’t have as much pressure out as you put in. If you can’t read the pipe size on the pipe leaving the meter, don’t worry. Sand down the surface of the polyethylene pipe if the hole has plastic sticking out 5. Use a wrench, or something similar, to achieve this. Unearth the pipe just a few inches away from the existing sprinkler head. Learn more about the units used on this page. Dig and remove the soil around the pipe. In the middle section we have a half circle spray. Example: 429-010 (typically a white colored fitting) • If the first number is "8" then the fitting is Sch. Learn more about the units used on this page. Only available for in-store pickup or local delivery. gives the pressure rating for pipes of various SDR. Be the First to Review. WSU Prosser - IAREC, 24106 N Bunn Rd, Prosser WA 99350-8694, 509-786-2226. Hot Water for Tubing: A trick among drip irrigation professionals is to briefly insert the end of a piece of tubing into a cup of hot water before attempting to connect fittings to the tubing. This pipe is also used in irrigation systems, and other piping & conduit applications. Login. The graphic below illustrates how this system works. Tubing is measured by the inside diameter (I.D.) At the center of my irrigation system I have a 2 1/2 inch pvc pipe with 35 psi. Deep well jet pumps can draw water from more than 100 feet and use a two pipe system to draw water from the ground. his article explains how to determine what pipe size you need. Irrigation lines require certain pipes and fittings to make your system run as efficiently as possible while holding up to the wear of constant water flow. Both gated pipe and flexible pipe are easy to install and remove. = 0.0126 CD2 H Where D = inside pipe diameter in inches. My thinking is that regardless of pipe size, once it is reduced to 75 psi, the same amount of water will be available. A. 75 LB. Slip on caps at one end of pipes that will be the end of the line. "At my local home center I noticed that they sell the same sized 1/4" tubing but for their larger main pipe size they sell a .600od (or .613 or .620 or .455). Determining the size (or “outside diameter”) of the tubing is essential to know which size of compression fitting to use. … Typical water meter sizes are: 5/8″, 3/4″, 1″, 1 1/2″. (irrigation) pipe standards. Zones should be approximately the same size throughout your drip-irrigation system. A. 100. 55 LB. A looped system has two pipes that are joined somewhere on the property to form a "loop". View. Decided to just bight the bullet and buy an 8 gallon compressor and this nifty tool to do it myself - should have done this 10 years ago. Minimum Pipe Size. “Black roll pipe” is commonly used for landscape irrigation systems in Northern areas and is used occasionally in the South. Max flow is about 45 gpm. The pipe comes in 300 foot rolls and is connected with insert fittings and clamps. As a side note, lubricants should never be used on drip irrigation tubing. For example, your bushing could have a 3/8 male thread on one side and 1/4 female threads on the other. To experienced irrigation contractors, installing electric valves is like driving – you can do it almost automatically, without thinking. Step 1: Add an Overflow. They can be a combination of male to female or reduce size. In the 1/2" size, a thickness ratio of 21 would result in pipe which would be too floppy to handle, so 1/2" pipe is commonly available in SDR 13.5, rated at 315 psi. enter the size of the service line in the space provided. To find your pipe size measure the circumference of the pipe with a string or a flexible tape measure. Flow rate required. Normally a single pipe leaves the pump and moves through the property to deliver water out of the risers to the irrigation bays. Determine what kind of pipe is broken, such as a PVC pipe or a smaller, flexible polyethylene pipe. A general guideline for drip irrigation is to keep the micron rating to 1/10 th or less of the smallest emission orifice on the drip tubing. 65 LB. This means that more ground can be covered during instal-lation while eliminating the cost of unnecessary joints. Understand the range of PVC pipes you can work with. Diameter: In the United States, PVC pipes range in diameter from 3/8 to 24 inches (9.53-60.96 cm). Schedule (the thickness of a pipe's inner wall): PVC pipes normally range from schedule 20 to 80. To find it, measure around the circumference of the pipe with flexible measuring tape. If you can’t read the pipe size on the pipe leaving the meter, don’t worry. I will do a homerun with 3/4 pex coming off the 1/2 pipe … Polyvinyl chloride, or PVC, is widely used in irrigation systems, both above-ground and buried. 40 LB. Working Pressure Tables 8 and 9 show the recommended maximum operting pressures of various classes and schedules of PVC pipe. An example is in your garden irrigation system. It screws into the main water line and is self-locking. Larger sizes of polyethylene Oval Hose™ are also available. Measure the outside circumference of the pipe that runs from the city main to the house. For example larger friction losses in a pipe going downhill may be allowable or even desirable. WSU Prosser - IAREC, 24106 N Bunn Rd, Prosser WA 99350-8694, 509-786-2226. We had a client that was a brilliant and wealthy engineer. Can I glue Schedule 40 PVC to schedule 80? $80.99. Clean the Pipe. Use a piece of sandpaper to get the best effect for this, but don't forget to … A mainline is usually 3/4" SCH 40 PVC or 1/2" poly tubing that go from a control valve to or through the yard, gardens or plant beds. • A prefix of "1" indicates that the fitting is a barbed poly pipe fitting. Drill 3/32” holes in the long lines about 8 to 12 inches apart down the length of the pipe. Irrigation projects are time-intensive jobs that can quickly become expensive. A looped system has two pipes that are joined somewhere on the property to form a "loop". The difference in area inside an 1 1/2″ pipe compared to a 2″ pipe … I think you guys are saying that for some reason it will so I will book some time off next week and replace all the 1/2 copper with pex. rotor or drip irrigation), and the available maintenance routine. or circumference before ordering pipe joining and repair products. Say you are using normal 25mm (1 inch) PVC pipe to run to the sprinklers. Pipe Size Estimate. Measure the inside diameter if the pipe has female threads. Looped systems are used to reduce the size of pipe … Looped systems are used to reduce the size of pipe required to deliver the necessary flow rate. 29021 FLX PIP PVC 1.5"X25' BLK. C = a constant varying from 0.87 to 0.97 for pipes of 2 to 6 inches in diameter and heights of 6 to 224 inches. Insert a T piece joining the pipes together. Variation in zone sizes will reduce the efficiency of pump operation. Most irrigators in southern climates use SDR 21 pipe, rated at 200 psi, for all pipe downstream of the valves. IPS (Iron Pipe Size) is a standard that matches Schedule 40 (plumbing) iron pipe o r stronger Schedule 80 iron pipe and is larger than PIP (Plastic Irrigation Pipe), a standard that is most commonly used today in agriculture. Product Code: 5836002-20. Although PVC pipe works great as a lateral material, the kind of PVC pipe needed varies from job-to-job. Irrigation Management Calculators. JM Eagle's Irrigation pipe is made in compliance with industry accepted P.I.P. From the Water Source The pipe that extends from your home's water supply to the irrigation area is the main line. However, collecting water from gutters and roofs and replenishing the lake will be a worthless endeavour if the water is being wasted through leaks, clogged pipes or damaged pumps/stations. PVC irrigation - pipe size. Irrigation mainline is a high quality of pipe. The length of the mainline should not exceed 200 feet in … Yes, the pipe size does make a difference. Both gated pipe and flexible pipe are laid out after the rows or borders are prepared and removed after the last irrigation of the season. Use a ruler or a caliper … Sign up now to join our newsletter mailing list. It should have a higher pressure rating assigned to it. Find the outside diameter if the pipe has male threads or no threads. Also, don’t lay a ruler across it and use that measurement. Find the exact area where the polyethylene pipe has a hole in it – hole may be on both sides so check carefully 4.