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Mechanical Systems - hdbk1132990202
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Design Considerations - index
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Piping Design


DOE-HDBK-1132-99
Piping systems that handle radioactive fluids require special design
considerations. Regardless of design pressures and temperatures, these
systems should be categorized as Normal Fluid Service, at a minimum, in
accordance with ASME B31.3 for design, material and component
selection, fabrication and erection, and examination and inspection.
Additional requirements should be added as determined necessary by
engineering design.
Maintenance activities that involve repairs, replacements, and
modifications to existing piping systems should be performed in
compliance with the original code of record used in the original design
and installation of these systems.
Process piping with surface temperatures exceeding 200 EF that
penetrates concrete walls, floors, and ceilings should be installed through
sleeves with insulation.
Piping and equipment with surface temperatures higher that 140 EF and
accessible from normal work areas, platforms, and access ways should
be insulated for personnel protection.
Excessive fluid velocities should be avoided in systems with condensed
liquids. Line losses rise dramatically with greater fluid velocities and the
potential to create undesirable vibrations increases.
Domestic water should be supplied by a separate service line. Combined
fire protection and potable water service or combined process water and
potable water systems should be avoided,
Backflow preventers and air gaps should be considered to prevent cross-
connection of potable water supplies. Vacuum breakers should be
considered to prevent back siphoning.
II-34


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