Specification 15210 - High Density Polyethylene (HDPE) Pipe, Fittings, And Appurtenances Page 5 of 9
August 2016
3066.07
C.
Prior to backfilling trench CONTRACTOR shall obtain as-built top of pipe
coordinates and elevations at grade changes, terminations, fittings, and at least
every 50 ft along the pipe.
3.2. INSTALLATION
A.
B.
Trench, backfill, and compact in accordance with Specification Section 02200.
Heat Fusion of Pipe:
1.
Weld pipe in accordance with the Manufacturer’s recommendation for butt
fusion methods. The Pipe Manufacturer shall certify fusion machine
operators.
Butt fusion equipment for joining procedures shall be capable of meeting
conditions recommended by the Pipe Manufacturer including, but not
limited to, temperature, alignment, and fusion pressures.
Branch saddle fusions shall be joined in accordance with manufacturer’s
recommendations and procedures. Branch saddle fusion equipment shall
be of a size to facilitate saddle fusion within the trench. Extrusion welds
shall not be allowed.
For cleaning pipe ends, solutions such as detergents and solvents, when
required, shall be used in accordance with the Manufacturer’s
recommendations. Solvents shall not be used unless approved by OWNER.
Do not bend pipe to greater degree than minimum radius recommended by
manufacturer for type and grade.
Do not subject pipe to strains that will overstress or buckle pipe or impose
excessive stress on joints.
Before butt fusing pipe, observe inside of each pipe length for presence of
dirt, sand, mud, shavings, and other debris or animals. Remove debris from
pipe prior to fusing.
Cap open ends of fused pipe at end of each working day to prevent entry by
animals, debris, or stormwater and potential escape of gas.
Use compatible fusion techniques when polyethylenes of different melt
indexes are fused together. Refer to the Manufacturer’s specifications for
compatible fusion.
Flange Jointing:
1.
2.
Use on flanged pipe connection sections.
Convoluted stainless steel backup rings shall be used for joining HDPE
pipes below grade, and epoxy-coated carbon steel backup flanges shall be
used above grade.
Butt fuse fabricated flange adapters to pipe or use electrofusion couplings.
Observe the following precautions in connection of flange joints:
a. Use full-face Viton gaskets only.
b. All fasteners and back-up rings shall be Type 316 stainless steel below
grade, and zinc-plated steel above grade.
c. Align flanges or flange/valve connections to provide tight seal.
Gaskets are required for flange/valve connections.
SANBORN HEAD
