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Valves - hdbk1132990185
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DOE-HDBK-1132-99
Consideration should also be given to provide future expansion of the system
without major system outages.
Particular attention to valve installation and positioning is recommended
to avoid head and knee injuries, eye injuries (due to the presence of valve
stems in the horizontal plane at eye level), and dripping hazards.
Valve access is best accomplished in the natural routing of pipe from
point to point, avoiding the use of vertical loops and pockets. Control
valves should be located adjacent to walkways wherever possible.
(Access platforms should be provided where valves are otherwise
inaccessible.)
Only infrequently operated valves should be located so that the bottom of
the handwheel is more than 6 feet, 6 inches above a floor or platform.
A minimum of 4 inches of knuckle clearance is recommended around
handwheels.
Chain-wheel operators can be used as long as they do not present a
hazard to operating personnel.
Control valves should be located near the operating equipment to be
observed while on local manual control.
Control valve manifolds should have a minimum of at least three
diameters of straight pipe both upstream and downstream of the control
valve.
Concentric reducers are recommended to make size reductions at the
control valve.
II-17


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