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GENERAL
The physical, chemical and mechanical properties of uPVC
pipes and fitting demonstrate their superiority in utility
and applications over conventional system.
DENSITY
The density of uPVC is approximately 1.43g/cm3, which is
almost 1/6th the weight of cast iron and steel, thus making
it much cheaper to transport and easier to handle during
installation.
MECHANICAL STRANGTH
The uPVC pipes are suitable even in verying conditions,
because of its mechanicial strength. This can be gauged from
the fact that the tensile, flexural and compressive strength
of uPVC is arround 450kg/cm2.
HYGIENIC
uPVC pipes offer the most hyginic means of fluid
transportation. They are highly capable in fighting attacks
by fungi and are not subject to contamination. The inside
surface which is extremely smooth, does not support any
growth, encrustation or fuming, and no odour or taste is
transmitted to the fluid being conveyed. This property is
prime importance for the transportation of potable water to
towns and villages.
CHEMICAL RESISTANCE
uPVC is unaffected by most concentrations of acids, alkalis,
organic chemicals, oils and fats. This resistance to
corrosion by most chemicals makes uPVC pipes indispensable
for contemporary industrial applications and for sewerage
purposes.
FLEXIBILITY
Being a thermoplastic material, uPVC is more capable to
withstand deformation due to earth movements. uPVC pipes in
this respect are considerably more popular than metallic and
asbestos cement pipes, which can collapse under stress
levels.
FIRE
RESISTANCE
uPVC pipes do not support combusion and are
self-extinguishing, a fact that has been proven over a
considerable amount of time. They are, therefore, ideally
suited for use in buildings and other constructions.
ELECTRICAL RESISTANCE
uPVC has a resistivity of greater than 1014Ohm.cm. and has
good insulating properties.
LOW
THERMAL CONDUCTIVITY
uPVC has a thermal conductivity of
0.13W/m/0C, which is only a fraction of the thermal
conductivity of steel.
This enables fluids to be transported through uPVC pipes,
maintaining a uniform fluid temperature. The lower
thermal conductivity factor also ensures that there is no
external 'sweating' on the pipes when fluids at a very
low temperature are passing through them.
HYDRAULIC RESISTANCE AND FLOW
CHARACTERISTICS
For there smooth inner surface, uPVC
pipes allow a greater flow of water than an identical size
of conventional
piping. The Haze-Willam's constant for uPVC pipes is around
150, which is higher than that for conventional
materials. The head loss of any proposed uPVC pipeline can
be readily calculated.
GALVANIC & ELECTROLYTIC IMMUNITY
Unlike metallic pipes which need
special surface coating to resist electrolytic action, uPVC
being a nonconductor of electricity, is totally immune to
galvanic and electrolytic attack. Thus, use of uPVC pipes
overcomes several problems in the piping material. |
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