d. Tighten flange bolts using a torque wrench in sequence and
accordance with manufacturer’s recommendations. CAUTION: Do
not over-torque bolts. CONTRACTOR shall use a torque wrench to
tighten all flange fasteners.
Pull bolts down by degrees to uniform torque in accordance with
manufacturer's recommendation.
Protect below grade bolts and flanges by covering with a 6-mil thick PE
wrap. Duct tape wrap to HDPE pipe.
Electrofusion couplers, where used, shall be installed per manufacturer's
specifications. The outside diameter of the HDPE pipe and face shall be
prepared in accordance with manufacturer’s recommendations prior to
installing the coupler.
D. Pipe Placement
1.
2.
3.
ND
“
10.
11.
12.
13.
Grade control equipment shall be of type to accurately maintain design
grades and slopes during installation of pipe.
Remove all standing water in trench before pipe installation.
Unless otherwise specifically stated, install pipe in accordance with
manufacturer’s recommendations.
Maximum lengths of fused pipe to be handled as one section shall not
exceed 400 feet and shall be placed according to manufacturer’s
recommendations as to pipe size, pipe SDR, and topography so as not to
cause excessive gouging or surface abrasion. Pipe wall gouges deeper
than 3/16-inch shall be cause for rejection of the pipe.
Cap pipe sections longer than single joining (usually 40 feet) on both ends
during placement except during fusing operations.
Remove dirt or debris from inside of pipe before backfilling.
Notify ENGINEER prior to installing pipe into trench and allow time for
ENGINEER’s inspection.
Correct irregularities found during inspection.
Complete connections within trench whenever possible to prevent
overstressed connections.
Allow pipe sufficient time to adjust to trench temperature prior to testing,
segment tie-ins, or backfilling activity.
Install reducers adjacent to laterals and tees.
To reduce branch saddle stress, install saddles at slope equal to and
continuous with lateral piping.
Place in trench by allowing minimum 12 inches/100 feet for thermal
contraction and expansion.
Coordinate construction of pipes near/in access roads with OWNER to
limit impediment of OWNER’s operations or operations of other
contractors.
File No. 3066.09
High-Density Polyethylene Pipe 15210 - 9 of 15 Revised February 2019
