Nozzles and Pumps

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Nozzles and Pumps
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NOZZLE TYPE

• Flat fan
• Hollow cone
• Flood jet

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FLAT FAN NOZZLE
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FLAT FAN NOZZLE
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HOLLOW CONE NOZZLE
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FLOOD JET NOZZLE
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FLOOD JET NOZZLE
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NOZZLE MATERIAL

• Very good chemical and wear resistance
• Ceramic, stainless steel

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NOZZLE MATERIAL

• Susceptible to damage
• Polymer (plastic)

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NOZZLE MATERIAL

• Susceptible to wear and corrosion
• Brass

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NOZZLE PERFORMANCE

• NOZZLE HEIGHT is determined by
• Nozzle spacing
• Nozzle spray angle

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NOZZLE PERFORMANCE

• OPERATING PRESSURE
• PSI pounds per square inch
• Generally between 30 40 psi
• Lower the psi the lower potential of drift

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DROPLET SIZE

• PRESSURE
• Higher pressures create smaller droplets

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NOZZLE PERFORMANCE

• OVERLAP
• 30 to 100
• Uniformity tapers at the edges of spray

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NOZZLE PERFORMANCE

• FLOW RATE
• To double (2x) the flow rate, pressure must be
  quadrupled (4x)
• higher pressure will
• -Decrease droplet size
• -Increase drift

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NOZZLE PERFORMANCE

• SPRAY ANGLE
• pressure will affect spray angle
• 8002 flat fan
• 80 degree _at_ 40 psi
• 65 degree _at_ 15 psi

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NOZZLE PERFORMANCE

• TIP WEAR
• compare the flow to a new tip
• replace when gt 10 flow of new one
• clean nozzles with soft bristled brush

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• Worn nozzles New nozzles

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CAUSES OF DRIFT

• WIND VELOCITY
• Early morning and early evening best times to
  spray
• Use lower psi under windy conditions

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CAUSES OF DRIFT

• DROPLET SIZE
• Smaller nozzle size and greater PSI create
  smaller drops

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CAUSES OF DRIFT

• SPRAY TIP HEIGHT
• Greater the distance between nozzle and target
• Greater wind velocity effect on drifting

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CAUSES OF DRIFT

• OPERATING SPEED
• increased speeds cause upward wind currents
  increasing drift
• Max speeds are 10 to 12 mph

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PUMPS

• POSITIVE DISPLACEMENT
• piston
• roller
• diaphragm

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PUMPS

• NON-POSITIVE DISPLACEMENT
• centrifugal

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PUMPS

• POSITIVE DISPLACEMENT
• captures and discharges a fixed volume per stroke
  via roller, piston, or diaphragm
• flow from the pump is proportional to the pump
  speed
• must have a relief valve when nozzles turned off

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PUMPS

• NON-POSITIVE DISPLACEMENT
• rotating impeller creates centrifugal force that
  discharges liquid through outlet
• when nozzles closed, no relief valve needed,
  impeller spins harmlessly