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Piping Systems cont'd
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Design Considerations - index
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Steam and Condensate Systems


DOE-HDBK-1132-99
In the design of supports for piping in compressible flow service, the
weight of the line filled with water for hydrostatic testing should be
considered.
3.1.2
Piping Design .
To protect against differential settlement or seismic activity, the design
should include suitable flexibility at building interfaces.
To avoid excessive system vibration, components that create large
pressure drops, such as valves and orifices, should be designed to
minimize the effects of cavitation and flashing.
To minimize the potential for costly evaluation of equipment nozzles, the
piping loads on equipment nozzles (e.g., vessels, heat exchangers,
pumps, etc.) should be conservatively estimated for the initial design of
this type of equipment.
The mid-span deflection due to dead weight loading should be limited to
no more than 1/8 inch for lines that are required to drain. For lines that
are not required to drain, deflection should be limited to inch.
Buried Pipe.
3.1.3
The trench for installation of buried piping should be of sufficient width
and depth to provide necessary bedding and cover, depending on traffic
volume to facilitate joining, trapping, and future maintenance concerns.
As applicable, analysis of buried piping should consider soil, surface,
internal pressure, thermal growth, soil settlement, water hammer, and
seismic loads.
Underground piping should be buried beneath the frost line. If conditions
do not allow this, heat tracing and insulation should be used.
II-35


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