Home Improvement Siding Kitchen Windows Vinyl Pools Patio Security 0199

Section 20 - Landscaping

The male portion of each threaded plastic pipe and fitting connection shall be wrapped with

at least two (2) layers of approved pipe thread sealant tape. Pipe from the service connection

through a backflow preventer assembly to plastic pipe supply lines shall be copper, bronze, or

as shown on the Plans, and shall be wrapped with six (6) mil plastic tape.

Plastic pipe supply lines shall be installed not less than twenty-four inches (24”) below the

finished grade, measured from the top of pipe, unless otherwise shown or specified in the

Valves and fittings shall be designed for and shall meet the requirements for service at an

operating pressure of one hundred fifty pounds per square inch (150 psi), unless otherwise

Valves and fittings shall have connections compatible with the type of pipe joint selected by

the Contractor. If mechanical joints or slip-type joints are used, the Contractor shall furnish and

install necessary portland cement concrete thrust blocks as specified by the Agency.

Guarantee shall cover workmanship of materials from the plastic pipe manufacturer for all

plastic pipe and fittings. Main irrigation lines shall be Schedule 40 for lines one and one-half

inches (1-1/2”) and smaller and Class 315 PVC for lines two inches (2”) and larger. Lateral

irrigation lines shall be Class 200 PVC. PVC pipe shall conform to CS 256 and ASTM

Designation: D 2241.

Pipe fittings shall be of the same material as pipe where applicable and recommended by

the pipe manufacturer for the particular type of pipe to which they are to be connected, and shall

conform to the following specifications.

All slip-joint PVC fittings shall be Schedule 40. All Schedule 40 PVC couplings four inches

(4”) in diameter or larger shall be a minimum of seven inches (7”) in length.

The Contractor shall use only the solvent supplied and recommended by the manufacturer

to attach PVC pipe and pipe joints. The pipe and fittings shall be thoroughly cleaned of dirt,

dust, and moisture before applying solvent.

The Contractor shall make solvent weld joints with nonsynthetic bristle brush in the following

1. Apply a liberal, even coat of purple PVC primer to the pipe and fitting immediately

before applying the solvent.

2. Apply a liberal even coat of solvent to the inside of the fitting and then to the outside

of the pipe, making sure that the coated area is equal to the depth of the fitting

3. Insert the pipe quickly into the fitting and turn the pipe approximately one-quarter

(1/4) turn to distribute the solvent and remove air bubbles. Hold the joint for

approximately fifteen (15) seconds so the fitting does not push off the pipe.

4. Use a clean rag and wipe off all excess solvent.

5. To prevent disturbing the last completed joint, the pipe shall not be twisted when

making subsequent joints.

Allow at least fifteen (15) minutes setup time for each welded joint before moving.

On plastic to steel connections, the Contractor shall work the steel connections first. For all

PVC threaded connections use thread sealing paste with virgin Teflon. In no event shall an oil

base joint compound be used on a PVC joint.

The Contractor shall exercise care in handling, loading, unloading, and storing plastic pipe

and fittings. All plastic pipe and fittings shall be stored under cover before using, and shall be

transported in a vehicle that can support the entire length of pipe. The Agency will inspect all

pipe before it is laid and will reject any section that is damaged or is found to be defective to a

degree which will materially affect function and service of pipe. Any section of pipe that has

been bent, dented, or damaged shall be discarded until said section of pipe is cut out and

rejoined with a coupling.