I.P.S. Pressure/Irrigation (P.I.P) Installation Guide - JM Eagle

4.4.2 Mechanical Tampers
Care should be taken to avoid contact between the pipe and compaction
equipment. Compaction of the embedment material should generally
be done in such a way that the compaction equipment is not used directly
above the pipe until sufficient backfill has been placed to ensure that the use
of compaction equipment will not damage the pipe or cause deflection of
the pipe.
When hydro-hammers are used to achieve compaction, they should not be
used within 3 feet of the top of the pipe and then, only if the embedment
material density has been previously compacted to a minimum 85 percent
Proctor density.
4.4.3 Flood or Water Tamping
Flooding or water tamping should be used only in trenches that are excavated
in soils from which water drains quickly and, at the same time, compacts
the haunching material.
If flooding is used, the approved embedment material is first hand placed,
making certain all voids under, around, and along both sides of the pipe and
couplings are filled. Initial embedment material should be placed to a height
sufficient to prevent floating of the pipe.
4.4.4 Water-Jetting
The introduction of water under pressure to the embedment material is not
to be used to compact the embedment material of PVC pipe or any other
flexible conduit.
IRRIGATION & I.P.S. PRESSURE INSTALLATION GUIDE
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