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INSTALLATION OF PE & BOSSPIPE PIPELINES
QUICK GUIDE
Trench is excavated to a width ensuring sufficient clearance between pipe and trench walls for placement
and compaction of
embedment materials, and for making and
inspection of joints.
Excavate foundation to the line and grade specified. The bottom of the trench shall be free
from ridges, hollows, lumps, large stones, etc. The trench shall be free of water.
Depending upon soil stability and depth, trench sides above the pipe crown may need to
be sloped, stepped or widened. Sidewall bracing may be used, if necessary.
When a pipeline is installed on steep grades or in unstable soils, installation may involve
use of alternative structural support.
The pipe bedding shall provide permanent support for the pipe.
The maximum particle size of readily compactable embedment materials is 7mm for
DN225 Bosspipe, 10 mm for PE pipes under 100 mm OD and DN300 Bosspipe, 14 mm
for PE pipes up to 160 mm OD and DN375 and DN450 Bosspipe, 20 mm for larger pipes.
The bedding material shall be placed and compacted, and shall uniformly support the
pipeline along its length. Depressions for sockets and other fittings should be made in the
bedding to allow the pipe barrel to rest firmly on the bedding over its entire length.
Pipes must be
handled and lowered into position without being dropped, dumped,
pushed, or rolled, chains shall not be used.
Bosspipe should be laid with socket end facing upstream. PE pipes may be welded in a
string on the ground level prior to positioning in the trench.
The pipes should be positioned along the centreline of the trench. PE pipe welded string
may be evenly bent to the specified radius.
Pipe side supports and pipe overlay are constructed following
jointing compacting the
embedment material in layers of usually not more than 150 mm thick without use of
heavy machinery.
Care should be taken that all levelling and alignment pegs, temporary packing and
restraints, etc. are removed from pipeline embedment and all voids filled and compacted.
Trench fill may include excavated material free from large rocks, organic matter, or
contaminated materials.
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©2005 Waters & Farr 
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