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CPVC
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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
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Semi-rigid plastic
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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)
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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
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Class 200
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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
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◦
The larger the pipe, the thicker the wall
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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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NSF – National Sanitary Foundation approved
for potable water
PVC 1120 – pipe material
PSI at 73 F – pressure rating
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Beige color
Plumbing applications
◦ Fittings not interchangeable with PVC
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Requires CPVC glue
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Resistant to sunlight deterioration
Drip irrigation, some sprinklers
Connected by inserts or couplers
Flexibility adapts to freezing conditions
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Economical
◦ Smaller pipe costs less
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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
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Cleaner
◦ Dirt and debris
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Primer (purple stuff)
◦ Dirt and debris
◦ Chemically softens plastic
◦ Often used instead of cleaner
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Cement (solvent weld)
◦ Chemically welds plastic together
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Square cut
Bevel edge on >4” pipe
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Prime
◦ Outside of pipe
◦ Inside of fitting
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Cement
◦ Outside of pipe
◦ Inside of fitting
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Insert pipe
Quarter turn
Hold for 30 seconds
Wipe off excess
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Set and cure time varies
◦ Temperature and time
 Colder takes longer
◦ 1” pipe cures in 15 minutes
Slip fittings
◦ Glue together
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Socket (S)
◦ “female”
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Spig (Sp)
◦ “male”
◦ Usually the pipe end
Threaded fittings
◦ Screw together
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Female pipe threads (FPT)
Male pipe threads (MPT)
Threaded fittings
◦ Teflon tape on constant pressure fittings
 Apply clockwise
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Changes connection type
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Reduces connection size
Fits into coupler
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Connects pipe
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Vulnerable to water hammer
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1” x ¾” tee (S x FPT)
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Repair coupler
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Repair, no glue needed
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Install Compression Tee
Copper, PVC, or PEX