normal supply is lost or interrupted. Typically, the following loads may be
sensitive to power interruptions and should be powered by a UPS. UPSs can
utilize converters or batteries. Batteries may be used to provide emergency
power in special facilities like telecommunication, alarm, and radio repeater
stations. Rechargeable batteries are recommended and should be maintained
fully charged at all times by float chargers. A design provision is recommended
for a portable emergency generator hook-up during an extended, planned
outage of the normal service to the battery charger.
This section describes design considerations useful to mechanical design personnel
involved in the design of piping and air pollution control systems within DOE nuclear
facilities. The guidance represents good design practices and lessons learned from
various design, construction, startup, and operations experiences.
Selection of an appropriate corrosion/erosion allowance is vital to the
service life of the system. Consideration of effects of temperature and
fluid velocities is very important in selecting and sizing the system
properly. For example, carbon steel piping may be acceptable for sulfuric
acid when the concentrations are above 93 percent, flow rates are below
3 feet/sec, and the temperature is below 122 EF.
Piping systems that perform safety-related functions are to be designed
and fabricated to more rigorous standards than other fluid service piping.
In accordance with ASME B31.3, Process Piping, Category M Fluid
Service may be designated for design, material and component selection,
fabrication and erection, and examination and inspection of these
systems. Certified Material Test Reports for material and components
provide additional assurance for these piping systems.