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 PVCAll 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 pipeOpen valves slowlyProperly 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