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The
Riser
A special rib will be incorporated in the cover
to facilitate the attachment of securing cable straps for
the electric cable. The Flexible Drop Pipe shall be constructed
from high tenacity polyester yarns, which are circular woven
and then totally encapsulated to form an integrated cover
and lining of a high performance polyurethane elastomer, which
is approved for use with potable water.
Riser
Specifications
The riser must have a minimum theoretical short
length burst pressure and tensile strength as stated on the
table below. The maximum extension should be no more than
3% and the maximum diameter swell 15%. The material should
be capable of operating in water with a pH from pH 4 to pH
9. The manufacturer should provide a warranty of not less
than 10 Years against materials and manufacturing defects.
Couplings
The Flexible Drop Pipe shall be fitted with fully
re-usable couplings each comprising
of the body and two outer fastening clamps. The body of the
coupling must contain two ribs
over which the hose fits and the clamps are tightened. The
two fastening clamps must be split into three equal parts.
The materials of construction shall be 316 stainless steel
for use with drinking water or where water is of an aggressive
nature. The couplings shall be
supplied with either BSP or NPT male thread for attachment
to the pump at one end and the head works at the surface.
Quality
Control
The manufacturer of the Flexible Drop Pipe should possess the
ISO 9002 QA registration.

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