Ctrl-C, Edit Paste Special, Operation: Add) Note that catch-can tests represent a specific wind and pressure situation and must be repeated to obtain information for other pressures or wind conditions Typical catch-can spacings are 2 or 3 m on a square grid, or 1 to 2 m spacings along one or more radial legs, with the sprinkler in the center Set up cans with half spacing from sprinklers (in both axes) to facilitate overlap calculations See Merriam & Keller (1978) also see ASAE S398.1 and ASAE S436 Sprinkle & Trickle Irrigation Lectures Merkley & AllenĤ V. Field Evaluation of Sprinklers Catch-can tests are typically conducted to evaluate the uniformities of installed sprinkler systems and manufacturers products Catch-can data is often overlapped for various sprinkler and lateral spacings to evaluate uniformities for design and management purposes A computer program developed at USU does the overlapping: CATCH3D you can also use a spreadsheet program to simulate overlapping (e.g. 5.7) lateral uniform! lateral uniform! lateral Merkley & Allen Sprinkle & Trickle Irrigation Lecturesģ Simulate different lateral spacings by overlapping catch-can data in the direction of lateral movement (overlapping along the lateral is automatically included in the catch-can data, unless it s just one sprinkler) IV.
wind Straightening vanes can be used to compensate for consistently windy conditions Overlapping sprinkler profiles (see Fig. Pressure is too low Pressure is OK Pressure is too high The precipitation profile (and uniformity) is a function of many factors: 1. Precipitation Profiles Typical examples of low, correct, and high sprinkler pressures (see Fig 5.5). For the same pressure and discharge, rotating sprinklers have larger wetted diameters Impact sprinklers always rotate the impact action on the stream of water is designed to provide acceptable uniformity, given that much of the water would otherwise fall far from the sprinkler (the arm breaks up part of the stream) Check out Web sites such as Sprinkle & Trickle Irrigation Lectures Merkley & AllenĢ III.
#FIRE SPRINKLER DESIGN BELOW OVERHEAD DOOR FULL#
Classification of Sprinklers and Applicability (see Table 5.1 from the textbook) Agricultural sprinklers typically have flow rates from 4 to 45 lpm (1 to 12 gpm), at nozzle pressures of 135 to 700 kpa (20 to 100 psi) Gun sprinklers may have flow rates up to 2,000 lpm (500 gpm 33 lps) or more, at pressures up to 750 kpa (110 psi) or more Sprinklers with higher manufacturer design pressures tend to have larger wetted diameters But, deviations from manufacturer s recommended pressure may have the opposite effect (increase in pressure, decrease in diameter), and uniformity will probably be compromised Sprinklers are usually made of plastic, brass, and or steel Low pressure nozzles save pumping costs, but tend to have large drop sizes and high application rates Medium pressure sprinklers ( kpa, or 30 to 60 psi) tend to have the best application uniformity Medium pressure sprinklers also tend to have the lowest minimum application rates High pressure sprinklers have high pumping costs, but when used in periodic-move systems can cover a large area at each set High pressure sprinklers have high application rates Rotating sprinklers have lower application rates because the water is only wetting a sector (not a full circle) at any given instance.