How to Guide

106
Plastics Technical Manual
Underground Installation of
Plastic Pipe
INSTALLATION PROCEDURES
5. Apply primer
between the mark
and pipe end on
both pipe ends.
Note: The use of
primer for ABS is
not recommended.
Check local code
requirements.
4
5
6
7
7. Push the repair
coupling toward
the gap until you
reach the mark on
the other pipe end.
A bead of cement
will be present
around the entire
diameter of the
pipe and coupling.
6. Apply heavy body
cement (if using
PVC) and apply
medium body
cement (if using
ABS) between the
mark and pipe end
on both pipe ends.
4. Place the repair
coupling on the
pipe with the
larger pipe ID
(inside diameter)
end facing the gap
between the pipe
ends. (The larger
pipe ID of the
Plastic pipe should always be buried in strict accordance with
the ASTM standard relevant to the type of plastic piping
system being installed. Those standards are:
ASTM D2321 Standard practice for Underground
Installation of Thermoplastic Pipe for
Sewers and other Gravity-Flow
Applications
ASTM D2774 Standard Practice for Underground
Installation of Thermoplastic Pressure
Piping
ASTM F1668 Standard Guide for Construction
Procedures for Buried Plastic Pipe
Note: In addition to these standards, pipe should always be
installed in accordance with all local code requirements.
coupling has raised quarter mark lines on the outside
diameter of the coupling.)
Recommendations for underground installation of plastic
drainage pipe:
1. The minimum width of the trench should be the pipe OD
(outside diameter) plus 16 inches, or the pipe outside
diameter times 1.25 plus 12 inches. This will allow
adequate room for joining the pipe, snaking the pipe in
the trench to allow for expansion and contraction where
appropriate, and space for backfilling and compaction
of backfill. The space between the pipe and trench wall
must be wider than the compaction equipment used to
compact the backfill.
2. Provide a minimum of 4 inches of firm, stable and
uniform bedding material in the trench bottom. If rock
or unyielding material is encountered, a minimum of 6
inches of bedding shall be used. Blocking should not be
used to change pipe grade or to intermittently support
pipe over low sections in the trench.