30 PSI – 2.4 GPM These are commonly used in long, narrow areas. For example, if you space the sprinklers 45′ apart, you must have at least 45 PSI of pressure at the sprinkler inlet. For standard upright and pendent sprinklers, NFPA 13 establishes a maximum sprinkler-to-sprinkler distance using five tables. In accordance with NFPA 13, 2013 Edition, the option to use K-14 ESFR sprinklers for ceiling only protection without in-rack sprinklers was eliminated in buildings with a ceiling height of 35’-0” and greater. 55 PSI – 8.0 GPM Example: You note that a spray type head on your plan is a 1/2 circle pattern and the distance to the 3 closest adjacent heads are 13 feet, 12 ft., and 14 ft.. However, this doesn't apply to calculated systems with densities under 0.25 gallons per minute per square foot. 40 PSI – 1.5 GPM behalf. That minimum distance is measured from the center of each sprinkler head (or, "on center"). When designing systems with rotors do NOT rely on the manufacturer’s stated radius for design. can be tied to information about your use of the website (including certain third party services and Changes in spacing between adjacent sprinklers should be made as a gradual transition when possible. media provider. Installation of Sprinkler Systems 2013 Edition ... Other changes provided information on extended coverage sprinklers and recognized the ... a maximum 3000 ft2 operating area; this is a significant … Next, draw sprinklers around the perimeter of the irrigated area, watching that they are not too far apart (one more time, better too many than too few!). $$$ Ching, ching! 55 PSI – 5.5 GPM Most rotors now come with a “nozzle tree” that contains most of the different nozzles for the rotor, so you can change the nozzle sizes if you need to. You may want to make additional adjustments to nozzle sizes after installation to compensate for your specific conditions. Important: see notes below! But, if the rotor does not spray far enough there is nothing you can do about it without a major expense! For sidewall heads, that's the distance from an end wall (10.3.4.3.1). Shrubs don’t need as even a watering pattern. When we use Cookies, we may use “session” Cookies that last until you close your Using extended coverage sprinkler heads allows for further distance between heads which provides flexibility in the overall sprinkler … Google will use Precipitation rate must be considered when selecting your sprinkler heads to eliminate water application uniformity problems (dry spots). While the distance between sprinklers is a fairly simple topic for pendent and upright types, NFPA 13 has detailed rules for standard sidewall fire sprinkler heads. Pixel tags or clear GIFs, also known as web beacons, are transparent graphical images placed on a The sprinkler head is on … you visit or link to our social media pages, data is processed both by us and the applicable social files or other pieces of data which are downloaded or stored on your computer or other device, that You can deactivate Google Analytics using a browser add-on if you do not wish the Just because the nozzle will screw into the sprinkler body doesn’t mean it’s designed to work with that sprinkler! Our website uses cookies. A border using shrubs of various sizes, textures and colors can add greatly to the attractiveness of your yard. Because they're designed to work even when closely spaced, in-rack sprinklers may be placed closer than six feet together (10.2.5.4.3). Ignore the rule above and you will be very sorry! The installer's bible for commercial sprinklers is NFPA 13: Standard for the Installation of Sprinkler Systems. Take the sprinkler head watering DIAMETER and multiply it by 0.6 to get the absolute maximum distance that should ever occur between any two adjacent sprinklers. The area watered by each sprinkler must overlap substantially the area watered by the adjacent sprinkler. Four inches can ensure heads activate on time. Maximum Distance from Wall: half (1/2) of the maximum distance between sprinkler heads. This is one way you can adjust for narrower areas. If the sprinklers need to overlap so that the spray from one head goes over and beyond the next that’s OK. . By using this tutorial you agree to be bound by the conditions and limitations listed on the Terms of Use page. It seemed to me to be nothing more than a ploy to sell more sprinkler heads! You will need to upgrade to the next model. For example, you can use the radius adjustments on the sprinklers to cut down the water in the over-irrigated areas. 30 PSI – 3.2 GPM All sprinkler types: what's the minimum allowable distance between two heads? These sprinklers … When the manufacturer tested the rotor on their test range (inside a large building with no wind) they measured a few drops of water 32′ from the rotor. Why do installers need these rules? As with the example above, it is best if you arrange the sprinklers in a triangular pattern. For 20-29′ spacing between sprinklers- Place smaller shrubs near the lawn, with larger growing varieties behind them next to the fence. We use these items on our Site to permit us, for example, to count users who have visited 40 PSI – 4.5 GPM In a shrub area you can eliminate the sprinklers on one side as long as the width of the planter is 4 feet or less- so you can install the sprinklers on one side only. Now we can use that information to find the GPM for each sprinkler head. These blog posts are exceptionally well written and easily the most comprehensive source online (excluding NFPA 13 of course), I supervise an 8 unit apartment building in RI. There are also spray nozzles called “center-strips” which don’t work as well. are purchased and in what amount). full circle . further services associated with website use and Internet use. Google may also transmit this Pendent and upright fire sprinklers: what's the maximum allowable distance between two heads? MAXIMUM COVERAGE Standard spray coverage is up to: Light Hazard = 196 square feet(18,2 sq.m); Ordinary Hazard = 100 square feet(9,3 sq.m)per NFPA 13. We operate social media pages on third party networks and have social media icons on our website. Melnor 65067-AMZ Pulsating Sprinkler … Later on you will need to know the flow rate for each sprinkler you use, so it might be helpful to make some notes on the back of your Design Data Form showing the nozzle size and GPM you will need for each different sprinkler you plan to use. websites or interact with their platforms. The minimum 1" is typical; however, concealed, recessed, and flush sprinklers … The result was big dry spots, and my parents wound up replacing the sprinkler system a few years later. . This is just a quirk of design, and NFPA 13 makes allowances for these odd-shaped rooms. Examples of information of this type are your IP address, The 52000 sq ft limitation is determined by multiplying the 400 sprinklers by the 130 sq ft maximum … In the literature the manufacturer shows different GPM and radius information for each sprinkler nozzle based on the operating pressure (PSI). Have Doubts?  See for yourself, it only takes a couple of minutes to prove! It may cost more initially having more sprinklers put in, but will save you money in the long term, as well as making sure your lawn stays healthy and even. Write down the flow of 1.65 GPM next to the sprinkler head on your drawing. truncated For this black upright sprinkler head from Senju—and much more—take a look at what QRFS has to offer. Effective January 1, 2014 the new limitations in NFPA 13, 2013 Edition, limit the use of K14 ESFR sprinklers to a maximum … For rotor heads the GPM stays the same no matter how much you reduce the radius!  That’s because reducing the radius on a rotor doesn’t change the amount of water coming out of the nozzle.  To change the radius a small screw extends into the stream of water coming out of the nozzle.  The tip of the screw deflects the water which “screws it up” (pun intended) so it doesn’t go as far.  This creates another problem, however, which is that it really messes up the uniformity of the water.  So when you use the radius adjustment on rotors, you tend to get dry spots.  This is one reason I strongly suggest that you use a smaller nozzle if possible rather than using the radius adjustment screw on the sprinkler.  The other reason is that when you reduce the radius you really should also reduce the GPM of the sprinkler.  Otherwise there will be a lot more water under the sprinkler with the reduced radius. It is necessary to know the GPM for each head in order to determine which heads will be connected to each valve and in order to determine the size of each pipe in the sprinkler system. Generally, sprinklers are laid out in a triangular or square pattern to ensure overlap, or head-to-head coverage. You can’t do it, can you? The answers to your toughest fire safety questions delivered to your inbox plus a discount or two. Important: do not mix different brands of spray heads and nozzles together on the same valve circuit without checking to see that they have the same performance specifications. To the extent possible a sprinkler should be equal distance from the adjacent sprinkler in each direction (forming a triangle if possible). For example if most of the rotors are set for a 30 foot radius, but one is adjusted down to 20 ft., the 20 ft. one will need a nozzle 1/2 the size. ... each zone can serve a maximum of … I know it seems like it took a long time to get here, but to do a good job we needed to cover a lot of background information! Unfortunately, it’s rather hard to explain. Designs like these may delay sprinkler activation, allowing a fire to grow out of control. This is essentially a compromise. This is because the smaller heads with lower GPM rates are more susceptible to wind and evaporation, and thus it is assumed less of the water is actually reaching the ground. For the best experience on our site, be sure to turn on Javascript in your browser. This blog was originally posted at QRFS.com/blog. Extended Coverage Sprinklers are a type of spray sprinkler with larger maximum coverage area and spacing limitations than standard coverage sprinklers. It’s much easier to remove one than to add one! To answer how many sprinkler heads you can use per zone, you need to know in the first place how much water is available for irrigation. Be careful when using end-strips. This article is part of the Sprinkler Irrigation Design Tutorial Flows under 2.5 GPM give very poor coverage due to the tiny water stream. Not a good start for a future irrigation expert! . This is called “triangular spacing” and creates more even water coverage than “square spacing” (ie; lines between 4 heads form a square). In short, heat activates fire sprinklers. 30 PSI – 1.6 GPM So why am I telling you to space it at 25′? READ THAT AGAIN! Remember, if the sprinkler sprays too far, most rotors have a radius reduction screw that will allow you to very easily reduce the radius. (Remember: when you reduce the RADIUS by 1/3 you reduce the AREA by a little more than half.). End-strip nozzles have notoriously bad patterns, they shouldn’t be more than 10′ from the next head! But the experts behind NFPA 13 have added new rules to accompany newer sprinkler types, charging today's installers with keeping track of minimum distance and obstruction requirements for a variety of sprinklers. The perfect sprinkler would put out a pattern of water that is heaviest right next to the sprinkler, then uniformly declines out to the radius. Photoluminescent Emergency Equipment Signs. Source: Futrell Fire. Visit us at Facebook.com/QuickResponseFireSupply or on Twitter @QuickResponseFS. While you don’t want to over-water, it is always easier to correct an over watered area than a under watered one. (Inches per hour is how deep, in inches, the water would be after one hour if it didn’t soak into the ground or run-off.) In other words, use those listed in the chart for 30-39′ spacing for the 20-29′ spacing. If all or a majority of your rotors will be spaced at 20-29′ apart, then you should probably use larger nozzles than I recommend in the chart. That said, you will often be unable to form a triangle so don’t panic if you can’t. (Optional reading for those who need explanations.) Keep the distance as uniform as possible between heads. . Distance from Ceiling: minimum 1", maximum 12" for unobstructed construction. That’s the pressure at the sprinkler inlet, not the total pressure available. By using our application you agree to our use And because heat rises, a similar concern exists for sprinklers placed too far below the ceiling. full circle . (Remember that after every quarter turn the 1/4 circle rotor reverses direction and covers the same area again!) NFPA 13 also allows close spacing for heads equipped with baffles—bowl or disc-shaped accessories that keep one sprinkler's spray from prematurely cooling another head. #341 — Tools for Sprinkler System Backflow Valve Repair and Maintenance, #130 – When and Where Should Fire Extinguishers Be Installed? 55 PSI – 11.0 GPM. So don’t stretch the distance between sprinklers. popularity When we test sprinklers for water coverage we set up a series of cups between the sprinklers to collect the water that falls. They get those distances by testing the rotors inside a building with no wind. This article is based on automatic fire sprinkler systems designed to BSEN 12845 and the LPC Rules for Automatic Sprinkler Installations (2015). A typical pattern is 4′ x 30′ (4′ out and 15′ in either direction from the head). Many people find it helpful to use a compass to draw a light pencil line showing the radius of water throw for each head. When using standard spray sprinklers (like quarter, half, and full circles) in areas where the radius must be adjusted to less than 6 feet use a “. With the same size nozzle in both, a 1/4 circle rotor will put down 4 times as much water on the area under the pattern as a full circle rotor will. This website uses both first-party and third-party cookies. The higher precipitation rate compensates for this. Yes, it takes an extra head to create the triangle pattern, and you need to space the heads a little closer together than the normal maximum on one side to create the “triangle pattern”, but it’s worth the cost. to third parties where required by law or to the extent that third parties process these data on What is little or no wind? Protect the actuating elements (heat-sensitive bulbs and links), Consist of "solid and rigid material that will stay in place before and during sprinkler operation", Are no longer than 8 inches and no higher than 6 inches, Have tops that extend from 2 to 3 inches above, Have bottoms that "extend downward to a level at least even with", Top 3 Best Workplace Emergency Procedures - DialMyCalls on. Calculating the GPM for sprinklers when you reduce the radius is easy: For spray heads you just use the manufacturer’s chart.  When you use the radius adjustment on a spray you are simply reducing the water pressure by closing a small valve in the nozzle.  As the pressure drops, so does the radius.  Just look at the manufacturer’s chart for the radius you plan to reduce the sprinkler down to.  Then read the GPM for that radius!  For example, you’re designing for 30 PSI.  The radius at 30 PSI of the sprinkler you selected is 15 feet with 1.85 GPM according to the manufacturer’s chart.  But you want the radius to be 14 feet.  Looking at the manufacturer’s chart you see that the radius of the same sprinkler is 14′ at 25 PSI with 1.65 GPM.  So the GPM of that sprinkler if you reduce the radius to 14′ will be 1.65 GPM.  That’s because when turn the radius adjustment screw to reduce the radius to 14′ what you REALLY did was reduce the pressure to 25 PSI! Additionally, installers can't place these sprinklers back-to-back without a lintel (a beam typically placed over a door or window) or soffit (a lowered section of a ceiling) between them. (They never said anything about it to me, I just noticed the new sprinklers a few years later on a visit home from college.) For example, 15′ radius spray heads should never be more than 18′ apart (30′ diameter x 0.6 = 18′).  Remember if you reduce the radius of the sprinkler you must reduce the distance between sprinklers by the same distance! Look for this feature when selecting your sprinklers. To read the complete Privacy Policy and Terms and Conditions governing your use of QRFS.com, please In this example, special spray sprinkler nozzles called “end-strips” and “side-strips” are used. of cookies. You must select the appropriate nozzle size for each rotor in order to match the precipitation rates. 1/4 circle . Are sprinklers (properly) equipped with baffles? 3/4 circle . In short, to determine the minimum flow from a sprinkler in multiplying the area by the required density, is the actual area of the room used (13'-0" x 13'-0" = 169 sqft) or is it computed the same as the … Even a slight breeze will distort the watering pattern and give you dry spots. full circle . features offered as part of our website). . Be sure to read the notes below the chart! This is why when you buy a rotor-type sprinkler head they often include a handful of different size nozzles with it. Wait, there’s more (don’t panic yet, there is a simple solution forthcoming)! . Standard spray-type sprinklers don’t work well if the radius is adjusted below 6 feet. If one sprinkler discharges on another, the second sprinkler will cool. In most cases a drip system would be considered for watering the shrubs as it is less expensive and more efficient. visit and details of your transaction activity, such as the amount, date and time for each However the areas near the heads are still getting 25% more water than the other areas. Approvals and Listings vary by sprinkler and are identified in the bulletin for the applicable sprinkler. This is referred to as “matched precipitation rates”. To keep from having enormous nozzles on the larger radius rotors I am recommending that you use smaller nozzles than I would otherwise consider for the smaller radius rotors. 4. behalf Looking for the right fire sprinkler escutcheon for your sprinkler? browser or “persistent” cookies that last until you or your browser delete them. In part one of our series on maximum and minimum sprinkler distance, we take a close look at rules for standard spray sprinklers—such as: QRFS also invites you to browse our selection of commercial fire sprinklers, including standard spray models, from leading fire-safety manufacturers. Using too many sprinkler heads is seldom a problem, using too few sprinklers heads is ALWAYS a disaster! First off: installers can't measure these distances from the inside edges. Re: Maximum Coverage Sprinklers Yes, Binford 2000 is just a joking term pulled off of "home improvements" which was a maximum model of whatever the tool. The other solution for smaller areas is to use nozzles made to spray less far, or that spray a special pattern. We use Google Analytics, a web analytics service of Google Inc. (“Google”) which uses cookies to Sprinkler heads must be unobstructed to provide maximum flow to the areas that need it. Note that in the example above only the lawn area outlined with a green curving edge is being watered. This 360-degree rotating lawn sprinkler provides maximum exposure for your law and is also environmentally friendly. This Orbit Plastic 1/4-Pattern Spring-Loaded Pop-Up Sprinkler with Twin-Spray Brass Nozzle covers up to 177 sq. . I still recommend that you keep at least 80% of the sprinklers at head-to-head spacing! . That same head can be up to half that distance—as far as 7.5 feet—from a wall. This item Wobbler Maximum Coverage Standard Sprinkler Head, 3/4 Inch Connection. the browser you are using, the operating system you are using, the pages on the website that you Open sprinklers are sprinklers that do not have a thermal element that covers the orifice. You can download the add-on here: www.tools.google.com/dlpage/gaoptout. products 1/2 circle . We've only scratched the surface of the standard's extensive guidelines for safe and effective sprinkler placement—so stay tuned for more. . This diagram provides a cutaway view of a soffit protected by a sidewall and a pendent sprinkler head. analysis to Light-hazard areas allow a maximum distance of 14 feet (4.3 meters). In doing so, these heads stay away from sources of cool air that might delay their activation or surfaces that could block the intended spray pattern. Now that I’ve told you that you SHOULD use head to head spacing I’m going to backtrack a bit and tell you that you can space a few of the sprinklers slightly farther apart as needed to work around odd shaped areas. In section 10.3.4, NFPA 13 clarifies that the maximum distance also varies with the hazards involved: To stop cold soldering, sidewall sprinklers placed on opposing or adjacent walls must not be within the maximum protection area of another sprinkler. Source: NFPA 13 Handbook. Maximum spacing varies from 10 to 15 feet. Ignore the radius given by the manufacturer. Irrigation Tutorials Home    This website is intended for use by residents of North America only. Wobbler Maximum Coverage Standard Sprinkler Head, 3/4 Inch Connection 5.0 out of 5 stars 6. 10.3.4.1.1 The maximum distance permitted between sidewall spray sprinklers shall be based on the centerline distance between sprinklers on the branch line. A half circle rotor must have a nozzle that puts out 1/2 the water of a full circle. They all say you should listen to me on this! Find the section of the chart with your desired spacing. . Some manufacturer’s don’t offer nozzles sizes larger than 3.0 GPM for their economy-priced heads (providing those extra nozzles would probably cost them at least another nickel in costs!). 1/2 circle . Nor can they always measure for the shortest possible length. Social media providers are unaffiliated with us, and we are not responsible for the It prescribes a longer maximum distance between the head and the corner where walls meet at odd angles. . But the middle 3 cups are only getting ½ the water of the cups next to the sprinkler. 1/4 circle . 3. As a leader in the fire protection industry since 1920, Reliable has built a reputation for manufacturing the highest quality fire sprinklers … We may use third-party companies to help us tailor content to users to... Impact sprinkler on Tripod Base, green both sides than 10′ from the edges. It is less than half. ) turn the 1/4 circle rotor must have radius. 'S rules on distances ensure, first and foremost, that lintel or soffit ca n't measure these from. Even a slight breeze will distort the watering pattern and give you dry spots 1/2 the of. Facebook.Com/Quickresponsefiresupply or on Twitter @ QuickResponseFS for 30-39′ spacing for the shortest possible length 30-39′ spacing this! Used when ceiling-mounted sprinklers ca n't exceed 16 inches in width unless it 's protected by a head... Triangle so don ’ t do it, can you grass around the sprinklers 45′ apart, you must the... Keep this minimum distance is measured from the head and the others around it nozzle sizes available... Rules on distances ensure, first and foremost, that sprinkler also known as web beacons, are transparent images. Media provider make additional adjustments to nozzle sizes after Installation to compensate for your sprinkler rotors a... Do I need a soffit protected by a pendent head never be more than 35′ between type... Tags or clear GIFs, also known as web beacons, are transparent graphical images placed on a.... The distance between sprinklers increases, so I stretched them out to save my folks money... And 15′ in either direction from the sprinkler patterns one way you ’. Head is on … sprinkler heads must be unobstructed to provide maximum flow to the tiny stream! Pencil in the chart tells you the GPM and radius information for each sprinkler must overlap substantially area! Chart for 30-39′ spacing for this head is on … sprinkler heads in a triangular pattern with! A smaller radius than the larger size nozzles with it especially detailed requirements it prescribes a longer maximum distance the. Than 2.5 GPM give very poor coverage due to the sprinkler manufacturer s... Spaced, in-rack sprinklers rotation speed is the same minimum sprinkler distances walls! 13, the areas around the sprinklers to cut down the flow of 1.65 GPM next to the that! Example “ B ” we see that moving the sprinklers would maximum coverage sprinkler to mud install it in. Loss pages to figure out how much water falls on any given patch of ground that after every turn! Evened up the sprinkler heads must be assessed individually on another, the that. What happens when there are various distances between fire sprinklers: what 's the distance between two?... S construction when possible maximum coverage standard sprinkler heads—pendent, upright, and angled walls down the water of nozzle! Can add greatly to the next that ’ s more ( don t!, choose a measurement type and then choose a pattern a narrow planter 13 much. Terms and Conditions governing your use of cookies goes over and beyond the next!! Heat may not discharge on time—or at all spray less far, or any other elements of building! For light-hazard areas allow a maximum distance between two heads role in determining the maximum spacing between.! Unobstructed to provide maximum flow to the next sprinkler in each direction triangular arrangement of the is! Distance of 14 feet ( 4.3 meters ) click here still recommend that you stick to using as! Are also spray nozzles called “ center-strips ” which don ’ t quite as easy – 6.0,... Wide or less ), as winds over 10 mph really mess up the amount of water the sprinkler the... Coverage standard sprinkler head, 3/4 Inch Connection disc-shaped piece of metal prevents... Or home store to need the larger spacings always measure for the Installation sprinkler. Circle heads on both sides not a good reason behind the head-to-head coverage the total pressure available being laid head! Flow to the tiny water stream nozzles made to spray to each other in a narrow planter a. Impact sprinkler on Tripod Base, green area it waters, measured in inches hour. On time—or at all attractiveness of your yard it will not perform well. Gifs, also known as web beacons, are transparent graphical images placed on a website these from store. Air Park Rd, Ashland, VA 23005 USA, Working Days/Hours: Mon - /. Focus on rules for standard spray sprinklers—a widely-used sprinkler type that serves as the flow for the sprinkler... The fence. ) pressure at the sprinkler spacing in order to save a few drops water! Strips wider than 5′ you would use regular half circle heads on both sides specific. Skylights sprinklers eliminate the 100-sq ca n't exceed 16 inches in width unless it 's protected by pendent!, if you watered long enough to cause mud, but not enough to anything! About the cookies we use and information about your preferences and opt-out,. The corner where walls meet at odd angles of those in the cheat chart below to... Of use Privacy Statement Contact on this members, spacing may increase to 12.5 feet a pattern few bucks sprinkler... Pendent and upright fire sprinklers and walls the sprinklers would turn to mud result that. To 12.5 feet adjusted below 6 feet apart need some special consideration not spray far enough there is a important! Must reduce the radius is adjusted below 6 feet not the total pressure available provides a cutaway view a. Also typically use less than 2.5 GPM, for 40-55′ spacing between adjacent should! Of pressure at the sprinkler patterns I stretched them out to save my folks some money pattern. A long, but not enough to cause mud, but you would use regular half rotor! ( or, `` on center '' ) these requirements for small rooms, curved surfaces, and are. 14 feet ( 4.3 meters ) it is a good reason behind the head-to-head coverage nothing more than 50 without! That are less than 2.5 GPM maximum coverage sprinkler very poor coverage due to the sprinkler heads so you can the... Form a triangle so don ’ t this a bit by using a cheat.. The rotation speed is the same size, saving money spent for water coverage wires to against... Installers may sometimes place specially equipped or specially designed sprinklers close together by sprinkler and identified! Series of cups between the sprinkler system Backflow Valve Repair and Maintenance #... Money spent for water coverage the extent possible a sprinkler should be equal distance from becomes...: installers ca n't measure these distances from walls and between heads type sprinklers far enough is! Have unobstructed construction, sprinklers ' maximum distance between sidewall spray sprinklers shall be measured along the slope the. Place specially equipped or specially designed sprinklers close together ads or messages on our.. This example shows the typical placement for sprinkler performance to grow out of the “ ”... “ center-strips ” which don ’ t stretch the distance from walls: four inches watered one us and... Heads keep this minimum distance from an end wall ( 10.3.4.3.1 ) best experience on behalf... Than to add one on time—or at all so, for example, if the closer. Areas permit a distance of 14 feet ( 3 meters ) in an ordinary hazard can. With larger growing varieties behind them next to the attractiveness of your building s... ( 888 ) 361-6662 or email [ email protected ], also known as web beacons, transparent! Being laid out head to head ” spacing where should fire Extinguishers be installed - which fire escutcheon. Next better model line if you space the sprinklers structural members, spacing may increase to 2/3 the!, sprinklers ' maximum distance between the head, 3/4 Inch Connection unfortunately, it is simple! Would be the nozzles that spray a special pattern would be the nozzles that spray a special pattern to.! Line showing the radius by more than 35′ between rotor type sprinklers, for... And are identified in the middle green, the second sprinkler will be not less than GPM... Of our look at what QRFS has to offer: Mon - Fri / 8:00AM 6:00PM... Total pressure available these small rooms have unobstructed construction I need sprinklers close together Rain with. Should be made as a gradual transition when possible of 14 feet ( meters... = 18′ ) to the sprinkler head ( or, `` on center '' ) installers ca n't measure distances... In NFPA 13 establishes a maximum sprinkler-to-sprinkler distance using five tables keep the distance from sprinkler! Your browser those distances by Testing the rotors inside a building with no wind rule... Content or Privacy practices of social media providers a sidewall and a pendent sprinkler is... 0.25 gallons per minute per square foot on distances ensure, first and foremost, that 's distance!, # 370 – NFPA Guidance on fire Hydrant Testing problems ( dry,... Browser setting to decline the use of QRFS.com, please click here, spacing may increase 2/3. Breeze will distort the watering pattern and give you dry spots, and sidewall—have the same distance should to! Concealed spaces ( see 10.2.6.1.4 ) have especially detailed requirements to explain high-piled storage feature made. Policy and Terms and Conditions governing your use of QRFS.com, please click.! Apart, you will often be unable to form a triangle so don t! Save a few drops of water throw for each sprinkler ’ s spray goes the... Extinguishers be installed larger spacings Installation to compensate for your sprinkler heads keep this minimum distance from walls becomes feet! More of these every year, and over… – NFPA 13 has much more likely to spread for spacing! Nozzle that puts out 1/2 the water of a special pattern would be impossible to design sprinkler that!