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Irrigation Pipe

Irrigation Pipe. CPVC. Pressure Rating Standards. Rated pressure – amount of pressure (PSI) pipe can handle Depends on pipe material, pipe’s diameter and wall thickness Decreases significantly when water temps exceed 73 F. POLYVINYLCHLORIDE (PVC). Semi-rigid plastic.

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Irrigation Pipe

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  1. Irrigation Pipe

  2. CPVC

  3. Pressure Rating Standards • Rated pressure – amount of pressure (PSI) pipe can handle • Depends on pipe material, pipe’s diameter and wall thickness • Decreases significantly when water temps exceed 73 F

  4. POLYVINYLCHLORIDE (PVC) • Semi-rigid plastic

  5. POLYVINYLCHLORIDE (PVC)

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

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

  8. 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

  9. 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

  10. 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

  11. 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

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

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

  14. POLYETHYLENE PIPE (PE) • Resistant to sunlight deterioration • Drip irrigation, some sprinklers • Connected by inserts or couplers • Flexibility adapts to freezing conditions

  15. Pulling Pipe

  16. SIZING PIPE too large • Economical • Smaller pipe costs less

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

  18. Pipe Damage • Water hammer –force of water coming to abrupt stops • Eventually cracks tees and elbows from repeated force

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

  20. 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

  21. Solvent Welding • Square cut • Bevel edge on >4” pipe

  22. Solvent Welding • Prime • Outside of pipe • Inside of fitting

  23. Solvent Welding • Cement • Outside of pipe • Inside of fitting

  24. Solvent Welding • Insert pipe • Quarter turn • Hold for 30 seconds • Wipe off excess

  25. Solvent Welding • Set and cure time varies • Temperature and time • Colder takes longer • 1” pipe cures in 15 minutes

  26. PVC Components Slip fittings • Glue together • Socket (S) • “female” • Spig (Sp) • “male” • Usually the pipe end

  27. PVC Components Threaded fittings • Screw together • Female pipe threads (FPT) • Male pipe threads (MPT)

  28. PVC Components Threaded fittings • Teflon tape on constant pressure fittings • Apply clockwise

  29. Adapter • Changes connection type

  30. Reducer bushing • Reduces connection size • Fits into coupler

  31. Coupler • Connects pipe

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