and positions of the screens, and the gradation of the material for the
filter pack which is to be installed around the well screen.
PART 2
PRODUCTS
2.1
WELL SCREEN
[The Contractor may, at his option, furnish and install well screen of any
of the alternate types specified.] [Well screen shall be of the type and
dimensions indicated.] Screen openings shall be uniform in size and
pattern, and shall be spaced approximately equally around the circumference
of the pipe.
2.1.1
PVC Pipe Screen
Pipe, fittings, and screen shall be of the size and types
[specified][shown.] Pipe, fittings, and screen shall conform to ASTM D 1784,
ASTM D 1785, ASTM D 2466, or ASTM D 2467. All joints in the PVC pipe shall
include couplings and shall be glued with a solvent cement conforming to
ASTM D 2564. The PVC pipe strength properties shall be equivalent to PVC
1120 Schedule [40] [80] unthreaded plastic pipe. [The well screen, pipe,
and fittings shall have a minimum collapse strength of [_____].] [The
screen, pipe, and fittings shall have a clear inside diameter of [_____].]
2.1.1.1
Couplings
Couplings shall be [bonded socket][threaded][certilock] type. Fittings
shall be produced of the same material and equal quality as specified for
plastic pipe screen. Socket type fitting connections of pipe sections
shall be bonded with solvent cement. The determination of the proportions
and preparation of adhesives, the method of application, and the procedure
used for making and curing the connections shall be the responsibility of
the Contractor. The system for making joints at the relief well site shall
provide a curing period adequate to develop the ultimate strength of the
solvent cement. Self-tapping screws or other devices for holding pipe in
the couplings during the setting period may be utilized as long as the
screws do not penetrate the inside of the pipe. In no case shall a
newly-made joint in the casing be stressed, lowered into the relief well,
or be submerged in water prior to complete curing of the solvent cement
adhesive.
2.1.1.2
Perforations
The PVC well screen shall be [mill slot][continuous wire wrapped rod base]
[continuous wire wrapped rod base on perforated pipe] [continuous wire
wrapped on perforated pipe screen] [similar to that manufactured by [_____]
Johnson Well Equipment, Inc., Pensacola, FL, telephone (904) 453-3131].
All well screen shall have smooth, sharp-edged openings free of burns,
chipped edges, or broken areas on the interior and exterior surfaces of the
pipe. [The [_____] mm inch diameter well screen shall have a number
[_____] slot, [0.0_____] mm inch open slot.] [The length of the slots
measured on the inside of the pipe shall be [_____] mm inches.] There
shall be a total open area of not less than [_____] square millimeters
inches per linear meter foot of [_____] mm inch diameter well screen. The
slots or groups of slots shall be distributed in a uniform pattern around
the periphery of the pipe and shall be oriented with the length of the
slot, [parallel to,] [normal to,] [or] [diagonal with] the axis of the pipe.
SECTION 02525A
Page 11
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