Irrigation sprinklers are sprinklers providing irrigation to vegetation, or
for recreation, as a cooling system, or for the control of airborne dust.The
sprinkler system irrigates the field drop by drop and thus it is widely used in
sandy areas as it checks the wastage of water through seepage and
evaporation.Sprinkler irrigation is a method of applying irrigation water which
is similar to natural rainfall. Water is distributed through a system of pipes
usually by pumping. It is then sprayed into the air through sprinklers so that
it breaks up into small water drops which fall to the ground. The pump supply
system, sprinklers and operating conditions must be designed to enable an
uniform application of water. In South india it is used in karnataka and tamil
nadu for the production of many crops.
Types[Back to Contents]
Sprinklers that spray in a fixed pattern are generally called sprays or spray heads. Sprays are not usually designed to operate at pressures above 30 lbf/in² (200 kPa) (30psi "Pounds per square inch"), due to misting problems that may develop.
Higher pressure sprinklers that themselves move in a circle are driven by a ball drive, gear drive, or impact mechanism (impact sprinklers). These can be designed to rotate in a full or partial circle.
Rainguns are similar to impact sprinkler, except that they generally operate at very high pressures of 40 to 130 lbf/in² (275 to 900 kPa) and flows of 50 to 1200 US gal/min (3 to 76 L/s), usually with nozzle diameters in the range of 0.5 to 1.9 inches (10 to 50 mm). In addition to irrigation, guns are used for industrial applications such as dust suppression and logging.
Many irrigation sprinklers are buried in the ground along with their supporting plumbing, although above ground and moving sprinklers are also common. Most irrigation sprinklers operate through electric and hydraulic technology and are grouped together in zones that can be collectively turned on and off by actuating a solenoid-controlled valve.
Home lawn sprinklers vary widely in their size, cost, and complexity. They include impact sprinklers, oscillating sprinklers, drip sprinklers, and underground sprinkler systems. Small sprinklers are available at home and garden stores or hardware stores for small costs. These are often attached to an outdoor water faucet and are placed only temporarily. Other systems may be professionally installed permanently in the ground and are attached permanently to a home's plumbing system. An ingenious domestic sprinkler made by Nomad called a 'set-and-forget tractor sprinkler' was used in Australia in the 1950s. Water pressure ensured that the sprinkler slowly moved across a lawn.
Permanently installed systems may often operate on timers or other automated processes. They are occasionally installed with retractable heads for aesthetic and practical reasons (making damage during lawn mowing or other maintenance less likely). These often are programed to operate at certain times of day or on some other schedule.
Underground sprinklers function through means of basic electronic and
hydraulic technology. This valve and all of the sprinklers that will be
activated by this valve are known as a zone. Upon activation, the solenoid,
which sits on top of the valve is magnetized lifting a small stainless steel
plunger in its center. By doing this, the activated (or raised) plunger allows
air to escape from the top of a rubber diaphragm located in the center of the
valve. Water that has been charged and waiting on the bottom of this same
diaphragm now has the higher pressure and lifts the diaphragm. This pressurized
water is then allowed to escape down stream of the valve through a series of
pipes, usually made of PVC (higher pressure commercial systems) or polyethylene
pipe (for typically lower pressure residential systems). At the end of these
pipes and flush to ground level (typically) are pre measured and spaced out
sprinklers. These sprinklers can be fixed spray heads that have a set pattern
and generally spray between 1.5–2m (7–15 ft.), full rotating sprinklers that can
spray a broken stream of water from 6–12m (20–40 ft.), or small drip emitters
that release a slow, steady drip of water on more delicate plants such as
flowers and shrubs. use of indigenous materials also recommended.
The first use of sprinklers by farmers was some form of home and golf course
type sprinklers. These ad hoc systems, while doing the job of the buried pipes
and fixed sprinkler heads, interfered with cultivation and were expensive to
maintain. In the 1950s a firm based in Portland, Oregon Stout-Wyss Irrigation
System, developed the rolling pipe type irrigation system for farms that has
become the most popular type for farmers irrigating large fields. With this
system large wheels attached to the large pipes with sprinkler heads move slowly
across the field.
Most irrigation sprinklers are used as part of a sprinkler system, consisting of various plumbing parts, piping and control equipment. Outdoor sprinkler systems are sometimes used as a deterrent against homeless people. This sprinkler system was programmed to drench unsuspecting sleepers at random times during the night. Local businessmen soon copied this system in an effort to drive homeless people away from public sidewalks adjacent to their businesses.