Irrigation Pipe

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Irrigation Pipe
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• CPVC

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Pressure Rating Standards

• Rated pressure amount of pressure (PSI) pipe
  can handle
• Depends on pipe material, pipes diameter and
  wall thickness
• Decreases significantly when water temps exceed
  73 F

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POLYVINYLCHLORIDE (PVC)

• Semi-rigid plastic

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POLYVINYLCHLORIDE (PVC)
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POLYVINYLCHLORIDE (PVC)

• Iron pipe size (IPS) the common standard that
  pipe is sized to fit couplers
• Plastic irrigation pipe (PIP) less common

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CLASSIFICATIONS OF PVC

• SCHEDULE PVC
• Pipe pressure ratings change with pipe diameter
  because wall thickness always the same

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CLASSIFICATIONS OF PVC

• SCHEDULE PVC
• Sch. 40 white
• Sch. 80 gray (thicker)
• Sch 40 PVC 1 pipe has a rating of 450 PSI
• Sch 40 PVC 4 pipe has a rating of 220 PSI

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CLASSIFICATIONS OF PVC

• SDR PVC
• All diameters have same pressure rating
• Class 200
• All CL 200 pipes are 200 psi
• Class 160
• All CL 160 pipes are 160 psi

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CLASSIFICATIONS OF PVC

• SDR PVC
• Standard dimension ratio-pressure rated
• Wall thickness is adjusted to the pipe diameter
• The larger the pipe, the thicker the wall

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PIPE DIMENSIONS

• OD controlled inside diameter is changed to
  meet the wall thickness requirements
• Used on PVC so that all pipe sizes of different
  thickness will fit in couplers

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PVC LABEL

• NSF National Sanitary Foundation approved for
  potable water
• PVC 1120 pipe material
• PSI at 73 F pressure rating

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CPVC

• Beige color
• Plumbing applications
• Fittings not interchangeable with PVC
• Requires CPVC glue

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POLYETHYLENE PIPE (PE)

• Resistant to sunlight deterioration
• Drip irrigation, some sprinklers
• Connected by inserts or couplers
• Flexibility adapts to freezing conditions

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Pulling Pipe
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SIZING PIPE too large

• Economical
• Smaller pipe costs less

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SIZING PIPE too small

• Operational efficiency
• When pipe is sized too small, water speed
  (velocity) is too fast
• Lose pressure to friction loss

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Pipe Damage

• Water hammer force of water coming to abrupt
  stops
• Eventually cracks tees and elbows from repeated
  force

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Pipe Damage

• Water hammer
• Reinforce tees on large pipe
• Open valves slowly
• Properly sized pipes to reduce velocity

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Solvent Welding

• Cleaner
• Dirt and debris
• Primer (purple stuff)
• Dirt and debris
• Chemically softens plastic
• Often used instead of cleaner
• Cement (solvent weld)
• Chemically welds plastic together

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Solvent Welding

• Square cut
• Bevel edge on gt4 pipe

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Solvent Welding

• Prime
• Outside of pipe
• Inside of fitting

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Solvent Welding

• Cement
• Outside of pipe
• Inside of fitting

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Solvent Welding

• Insert pipe
• Quarter turn
• Hold for 30 seconds
• Wipe off excess

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Solvent Welding

• Set and cure time varies
• Temperature and time
• Colder takes longer
• 1 pipe cures in 15 minutes

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PVC Components

• Slip fittings
• Glue together
• Socket (S)
• female
• Spig (Sp)
• male
• Usually the pipe end

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PVC Components

• Threaded fittings
• Screw together
• Female pipe threads (FPT)
• Male pipe threads (MPT)

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PVC Components

• Threaded fittings
• Teflon tape on constant pressure fittings
• Apply clockwise

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Adapter

• Changes connection type

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Reducer bushing

• Reduces connection size
• Fits into coupler

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Coupler

• Connects pipe

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Elbow
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Tee

• Vulnerable to water hammer

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Reducing Tee

• 1 x ¾ tee (S x FPT)

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Cross
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Telescopic Coupler

• Repair coupler

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Compression Coupler

• Repair, no glue needed

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Point of Connection

• Install Compression Tee
• Copper, PVC, or PEX