Irrigation Pipe
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Transcript Irrigation Pipe
CPVC
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
Semi-rigid plastic
Iron pipe size (IPS) – the common standard
that pipe is sized to fit couplers
Plastic irrigation pipe (PIP) – less common
SCHEDULE PVC
Pipe pressure ratings change with pipe
diameter because wall thickness always the
same
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
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
SDR PVC
◦
Standard dimension ratio-pressure rated
Wall thickness is adjusted to the pipe
diameter
◦
The larger the pipe, the thicker the wall
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
NSF – National Sanitary Foundation approved
for potable water
PVC 1120 – pipe material
PSI at 73 F – pressure rating
Beige color
Plumbing applications
◦ Fittings not interchangeable with PVC
Requires CPVC glue
Resistant to sunlight deterioration
Drip irrigation, some sprinklers
Connected by inserts or couplers
Flexibility adapts to freezing conditions
Economical
◦ Smaller pipe costs less
Operational efficiency
◦ When pipe is sized too small, water speed (velocity)
is too fast
Lose pressure to friction loss
Water hammer –force of water coming to
abrupt stops
◦ Eventually cracks tees and elbows from repeated
force
Water hammer
Reinforce tees on large pipe
Open valves slowly
Properly sized pipes to reduce velocity
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
Square cut
Bevel edge on >4” pipe
Prime
◦ Outside of pipe
◦ Inside of fitting
Cement
◦ Outside of pipe
◦ Inside of fitting
Insert pipe
Quarter turn
Hold for 30 seconds
Wipe off excess
Set and cure time varies
◦ Temperature and time
Colder takes longer
◦ 1” pipe cures in 15 minutes
Slip fittings
◦ Glue together
Socket (S)
◦ “female”
Spig (Sp)
◦ “male”
◦ Usually the pipe end
Threaded fittings
◦ Screw together
Female pipe threads (FPT)
Male pipe threads (MPT)
Threaded fittings
◦ Teflon tape on constant pressure fittings
Apply clockwise
Changes connection type
Reduces connection size
Fits into coupler
Connects pipe
Vulnerable to water hammer
1” x ¾” tee (S x FPT)
Repair coupler
Repair, no glue needed
Install Compression Tee
Copper, PVC, or PEX