Ordinary Hazard 1 and 2: Coverage area of 130 square feet per sprinkler head; 15-foot distance maximum between sprinklers. Extra Hazard 1 and 2: Coverage area of 90-130 square feet per sprinkler head, based on certain factors; 12-foot distance maximum between each sprinkler head.
Typically, though, a sprinkler system zone will boast 5 to 6 rotor heads and/or 8 to 10 spray heads.
New fire codes allow a single sprinkler head to protect up to 200 square feet, depending on the design of the fire sprinkler, flammability of the building and the materials within it. The NFPA delineates spacing requirements based on the material hazards, plumbing, and piping systems of the specific construction.
Light Hazard (10-15 ft). Excluding heads in combustible concealed spaces, all sprinklers in this category have 15 feet (4.6 meters) of maximum allowable spacing between them. Ordinary Hazard (15 ft). All sprinklers in these environments have a 15-foot (4.6-meter) maximum.
Ideally, if you maintain the head-to-head layout along the length of the area, you can stretch the spacing across the area so that the next run of sprinklers should be no more than an extra 1/3 of the sprinkler radius away (e.g. if a sprinkler had a radius of 6mt, then the next run of sprinklers should be no more than ...
You can operate 2 or 3 sprinklers at one time with 'Y's and extra hoses, depending on your water pressure.
I'd suggest trying energizing only one zone at a time, to see if just one zone behaves differently than having them all on at the same time. How many sprinklers do you have? If you have a bunch, and they are all on at the same time, then the pressure would be low, and likely not enough to "pop up" the heads.
Running multiple zones at once is usually not possible due water-pressure and flow limitations at residential properties.
Zone Calculator is a tool designed to help the installer determine how many heads to install with each irrigation / sprinkler zone. This is the available Gallons Per Minute that you are using for irrigation for this particular zone. This is generally less than 15 for residential properties.
Branch lines should not exceed eight sprinkler heads on either side of a cross main. Areas within fire walls may be subdivided into separate fire areas by one-hour partitions.
Most spray and rotator heads are designed to work their best at about 30 psi. When pressure is lower, the watering radius will be reduced, so you may need to place your heads closer together to get the coverage you need. Higher pressures – those above about 40 psi – will cause the head to mist or fog.
A common rule that is followed for obstructions within 18 inches of the sprinkler deflector is the “three times rule”. This requires sprinklers to be positioned away from obstructions a minimum or three times the maximum dimension of the obstruction.
On the other hand, watering longer but less frequently, “deep watering,” produces deep roots that mean lawns can better survive periods of drought. The ideal watering schedule is once or twice per week, for about 25 to 30 minutes each time.
A watering session should be long enough to soak the area sufficiently so all the roots receive a beneficial drink. Sprinklers should be set to run for about 30 to 35 minutes at a time twice a week. Your goal is at least 1″ of water a week for your lawn.
Nothing should be in that area between the bottom of the sprinkler heads and the imaginary horizontal plane parallel to the ceiling that is 18 inches below. This is done to allow an even and unobstructed spray pattern from the sprinklers when triggered to extinguish the fire.
The Low Pressure Wobble Sprinkler can be joined up with other sprinklers of the same type. You will need to add extra hoses and connectors. Each of these sprinklers has an outlet opposite the water inlet which can be unscrewed to add extra sprinklers.
Maximum Distance from Wall: half (1/2) of the maximum distance between sprinkler heads. Minimum Distance Between Sprinklers: typically 6'-0". Distance from Ceiling: minimum 1", maximum 12" for unobstructed construction.
A common question we receive is whether a ceiling can be too high to install sprinklers. The answer, like so many great engineering answers, is “it depends.” Experience and testing have shown sprinklers to be effective and necessary at heights in excess of 50 feet.