Piping Design

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.

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