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Site Considerations for Outdoor Equipment
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Design Considerations - index
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Lined Pipe


DOE-HDBK-1132-99
1.3.2
Clearances.
Adequate clearances should be provided between pipe and other piping
systems, ductwork, structural steel and concrete, equipment, and cable
trays to permit interference-free erection and allow for maintenance and
in-service inspection and reduces the possibility of impact during a
seismic event.
Proper clearances will allow for the removal of valves and other
equipment. Piping should not be routed across floors, walkways, or
working spaces if that location could be a hazard.
Overhead clearance to the bottom of piping or pipe racks should address
the following guidelines:
7 feet, 6 inches over walkways inside buildings,
15 feet elevated yard piping and/or pipe racks over roadways,
22 feet over railroad tracks.
Vents and Drains . Vents and drains facilitate the filling, hydrostatic testing, and
1.3.3
draining of piping systems. The following guidelines provide the piping system
with adequate venting and draining.
Where possible, the piping system should be designed with only one high
point and one low point; vent and drain connections should be provided
at these locations.
Liquid systems 2.5 inches and larger in diameter should be vented and
drained at all high and low points.
Liquid systems 2 inches and smaller in diameter should be vented and
drained at the highest and lowest points in the system. Piping of this size
self-purges any intermediate high and low points.
II-11


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