- Certified Irrigation Technician Hydraulics and Water Management Flashcards
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Read the first 6 - Certified Irrigation Technician Hydraulics and Water Management flashcards as text
What is 'water hammer' in an irrigation system and what causes it?
Answer: A rapid pressure surge caused by the sudden stoppage of water flow, such as when a valve closes quickly
Water hammer is a pressure surge (hydraulic shock) that occurs when flowing water is suddenly stopped, typically by a fast-closing valve. The kinetic energy of the moving water converts to pressure energy, creating a shock wave that can damage pipes, fittings, and valves.
When designing an irrigation system, the 'design pressure' at a sprinkler head refers to:
Answer: The dynamic pressure required at the sprinkler head for optimal performance as specified by the manufacturer
Design pressure is the dynamic (working) pressure required at each sprinkler head for it to achieve its rated performance — proper radius, precipitation rate, and distribution uniformity. This is specified by the manufacturer, typically 30 PSI for spray heads and 45 PSI for rotors.
A technician needs to determine the available GPM from a residential water supply. The most accurate field method is:
Answer: Using a flow gauge on an outdoor hose bib and measuring while maintaining target pressure
The most accurate field method for determining available GPM is to measure actual flow at an outdoor hose bib using a flow gauge (or bucket-and-stopwatch method) while monitoring pressure to ensure it remains adequate for the irrigation system design.
In irrigation hydraulics, what does the term 'head loss' refer to?
Answer: The total energy loss in a piping system expressed as an equivalent height of water column
Head loss represents the total energy loss in a piping system due to friction, fittings, and elevation changes, expressed as feet of water column (or equivalent PSI). It is used in hydraulic calculations to determine if sufficient pressure is available at sprinkler heads.
What happens to water pressure in a pipe when the pipe diameter is reduced at a fitting (such as a reducer)?
Answer: Pressure decreases and velocity increases
According to Bernoulli's principle, when pipe diameter decreases, the water velocity must increase (to maintain the same flow rate through a smaller area), and the pressure correspondingly decreases. This is why undersized pipes and fittings cause pressure problems.
A pump is rated at 50 GPM at 40 PSI TDH (Total Dynamic Head). What does TDH include?
Answer: The sum of elevation lift, friction loss, and required operating pressure at the discharge point
Total Dynamic Head (TDH) includes all the components the pump must overcome: the vertical lift (elevation difference), all friction losses in piping and fittings, and the operating pressure required at the most remote point of discharge (sprinkler head or emitter).