Environmental Engineering Reference
In-Depth Information
Adjustable pipe roll stand
Anchor chair
Standard ring and bolt hanger
Adjustable clevis and band hanger
Adjustable swivel pipe roll
figure 4.2 Pipe hangers and supports.
4.8 MeTalliC PiPing
Pipe materials that are used to transport water may also be used to
collect wastewater. It is more usual, however, to employ less expensive
materials because wastewater lines rarely are required to withstand any
internal pressure. Iron and steel pipe are used to convey wastewater
only under unusual loading conditions or for force mains (interceptor
lines) in which the wastewater flow is pressurized (McGhee, 1991).
4.8.1 Piping Materials
Materials selected for piping applications must be chosen keeping
in mind the physical characteristics necessary for the intended service;
for example, the piping material selected must be suitable for the flow
medium and the given operating conditions of temperature and pressure
during the intended design life of the product. For long-term service
capability, the mechanical strength of the material must be appropriate;
the piping material must be able to resist operational variables such
as thermal or mechanical cycling. Extremes in application temperature
must also be taken into account with respect to material capabilities.
Environmental factors must also be considered. The operating
environment surrounding the pipe or piping components affects pipe
durability and life span. Corrosion, erosion, or a combination of the two
can result in degradation of material properties or loss of effective load-
carrying cross-section. The nature of the substance contained by the
piping is an important factor, as well.
