TECHNICAL
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15.0mm × 1.0mm
22.0mm × 1.2mm
28.0mm × 1.2mm
35.0mm × 1.5mm
42.0mm × 1.5mm
54.0mm × 1.5mm
76.1mm × 2.0mm
88.9mm × 2.0mm
108.0mm × 2.0mm.
WASTEWATER JUNCTIONS ALSO CRIMP-FITTABLE
A range of wastewater junctions in stainless steel has also been
developed using the crimp press-fitting system. They are easy for
rodding programmes to clear blockages that have developed because
of the bend’s long radii and easy lateral joints.
These fittings have been developed, as it was anticipated by clients and
engineers that heavy expenses could be incurred when plastic or HDPE
piping was used in the under-hang pipe system, and it collapses, is
damaged, or leaks as a result of the rodding process.
Wastewater flows by gravitation, and the main concerns are typically
the build-up of fluids in the piping as a result of blockages, and/or pipe
assembly configurations. Because of the uniform internal diameter of
the stainless-steel piping, it would be difficult for a blockage to occur,
subject only to a possible build-up of grease or fats at a relatively long
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distance from source on an extremely cold day, for example. This can
however easily be cleared by rodding or heating to release a blockage,
which is not possible with other pipe systems. Back pressure in the
piping will then aid in clearing the blockage onward.
WHEN STAINLESS STEEL IS THE CORRECT CHOICE
Stainless steel naturally has an aesthetic appeal and can be used in any
water reticulation system. It does not rust, and paint or coatings are also
not necessary. However, some applications are more appropriate for this
material choice. These include and are subject to the selection of the
correct grade of stainless steel:
• In a corrosive environment, such as where an installation would
be subject to sea air or would require conveyance of chemicals,
whether acidic or alkaline.
• Environments with extremely low or high temperatures, to prevent
challenges with brittleness or resistance, which include plastics
and copper pipes.
• Where high strength over mass is required. The mechanical
properties of stainless steel allow thinner wall sections to be
used than with other materials, thus reducing weight without
compromising on strength.
• Where hygienic conditions are a priority. Stainless steel is
internationally recognised as the most hygienic material for processes
that involve the preparation of food or beverages as well as in medical
facilities due to its passive surface. Stainless steel typically has no
pores or cracks to harbour dirt, grime, or bacteria. PA
May 2019 Volume 25 I Number 3