enough to provide a minimum clear distance of 13 mm 1/2 inch between the
pipe and sleeve, except where otherwise indicated. Sleeves through
concrete may be 0.912 mm 20 gauge metal, fiber, or other approved material.
Sleeves shall be accurately located on center with the piping and shall be
securely fastened in place. The space between the sleeves and the pipe
shall be caulked and filled with bituminous plastic cement or mechanical
caulking units designed for such use.
3.5.5
Fiberglass Reinforced Plastic (FRP) Pipe
Field assembly of the pipe shall be done in conformance with the
manufacturer's written instructions and installation procedures. Several
pipe joints having interference-fit type couplings may be field-bonded and
cured simultaneously. However, the pipe shall not be moved nor shall
additional joints be made until the previously laid joints are completely
cured. Joints not having interference-fit type couplings shall be fitted
with a clamp which shall hold the joint rigidly in place until the joint
cement has completely cured. The clamps shall have a protective material
on the inner surface to prevent damage to the plastic pipe when the clamp
is tightened in place. The pipe shall be provided with a device or method
to determine when the joint is pulled against the pipe stop. A gauge
provided by the pipe manufacturer shall be used to measure the diameter of
the spigot ends to insure the diameter conforms to the tolerances specified
by the manufacturer. All pipe ends shall be gauged. FRP pipe shall be
utilized for buried piping only. No aboveground FRP pipe is allowed.
Cutting shall be done with a hacksaw or circular saw with an abrasive
cutting wheel.
3.5.5.1
Installation
Pipe shall be buried to the elevation shown on the profiles, except that in
no case shall pipe under roadways be buried less than 900 mm 36 inches.
Backfill shall not include large or sharp-edged rocks of any size in direct
contact with the pipe surfaces. Compacting shall be done so as to avoid
damage to the pipeline. Conduits or sleeves of steel pipe at least 50 mm 2
inches in diameter larger than the FRP pipe size shall be provided under
heavy traffic roadways. Bending of pipe to follow ditch contours shall be
limited to long trench curvatures and will not be permitted for abrupt
changes in pipe direction. Bend radii shall not be less than shown in the
manufacturer's installation procedures.
3.5.5.2
Thrust Blocks
Concrete thrust blocks shall be provided at all tees, valves, blind
flanges, reducers, or whenever the pipe alignment changes direction. They
shall be sized in accordance with the pipe manufacturer's instructions to
suit local soil conditions, operating pressures, test pressures, pipe size,
and thermal conditions. In case of a conflict, the most stringent
requirements shall govern.
3.5.5.3
Curing of Field-Bonded Joints
All field-bonded epoxy-cemented joints, regardless of ambient temperatures,
shall be cured with a self-regulating, thermostatically controlled
electrical heating blanket for the time and temperature recommended by the
manufacturer for the applicable size and type of joint, or by an alternate
approved heating method. The joined sections shall not be moved during
heating or before the joint has cooled to 27 degrees C 80 degrees F or to
ambient temperature, whichever is higher.
SECTION 15559A
Page 106
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