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Installation prerequisites
The Nitrogen Supply Cylinders shown in
Figure 5-2
are used as a source of the nitrogen and
the control panel will use this to replenish the nitrogen pressure within the valve anytime it
falls below the desire set point. Conversely if the set point at the valve is higher than the
desired set point, the control panel will relieve the excess pressure from the valve.
Since the Daniel valve does not consume nitrogen, unlike competitive valves, the need to
adjust nitrogen is normally due to changes in pressure due to ambient temperatures.
The nitrogen set point pressure is measured using a pressure transmitter, which can be
transmitted to a remote control room. The system nitrogen set point is field adjustable by
authorized personnel. A complete Emerson control valve system can be furnished that will
include the surge relief valve, inlet/outlet piping, nitrogen control panel, supply cylinders
and the plenum. The system is carefully designed, engineered and assembled onto a
structural skid with a lifting facility (as shown below in
Figure
5-2).
Figure 5-2:
Surge relief system with nitrogen panel and plenum
User manual
71
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