EN Catalog 2021-22 - Catalog - Page 36
BEDDING
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A recommended 150 mm (6") bed of backfill material should be laid underneath the prior to pipe installation and there must
never be voids under or around the pipe.
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When laying duct onto a concrete base a 150 mm (6") thick bed of compacted sand should be laid on the concrete, below the
duct. (Absolute minimum amount of sand should be 50 mm (2") of compacted sand).
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All beds should be laid so that the pipe will not dip or sag when it is installed.
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UPP® pipe exceeding 12 m (40 ft) should be laid in a series of large snake-like curves and not in straight lines. Uncoiled pipe,
when laid, will settle in a natural curve.
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Generally any thermal expansion will be accounted for by following our guidelines for spacing, backfilling and ensuring runs
are not dead straight.
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Pipes should be separated from each other by at least the diameter of the largest pipe.
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If used above ground, UPP® pipe should be protected against mechanical, climatic and fire damage by wrapping it in radiation
or thermal shielding tape. Additional supports and anchor points may also be required.
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Contact Franklin Fueling Systems Technical Services for more details concerning above ground installations (see page 86).
Underground pipe runs may be continuous or have electrofusion welded joints. Any mechanical joints or compression fittings
must be inspectionable and located within a containment chamber or sump.
If pipe-runs cross each other they must be separated by at least as much backfill material as the diameter of the largest pipe
or protected by using at least 25 mm (1") of styrofoam.
PIPE SPACING
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Bed/backfill with pea-shingle, sand or crushed rock.
Separate pipes by the diameter of the largest pipe in the run.
For spacers and support use:
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Expanded polystyrene (Styrofoam).
Pipe off-cuts.
Timber/block/brick (as temporary measures).
Sacks of backfill.
12" 300mm (min)
150mm (min) 6"
150
d1
d1
150
150mm (min) 6"
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