Baker Hughes Masoneilan SVI II AP Series, Быстрый старт

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Masoneilan SVI II AP Digital Positioner Quick Start Guide = | 43
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Connecting the Tubing and Air Supply
The last step in hardware installation for the SVI II AP is to
connect the air supply to the positioner. This section describes
the process for connecting the tubing and air supply to a single
and double acting positioner.
Natural Gas Supply Considerations
If the pneumatic system is connected to natural gas, the
pneumatic control system constantly bleeds a small amount of
the natural gas into the area around the SVI II AP. Also, during
a vent cycle (actuator pressure relief), natural gas from the
actuator is released into the area around the SVI vent port.
Consider both sources of natural gas when evaluating the
Hazardous Classification for the area (See GEA19681
Masoneilan Valves SVI II AP Installation and Maintenance
Manual for further discussion on installing an SVI II AP in a
natural gas environment).
Remote piping of the actuator venting is possible to reduce the
amount of natural gas released into the area around the SVI II
AP (See GEA19681 Masoneilan Valves SVI II AP Installation
and Maintenance Manual for further discussion on installing an
SVI II AP in a natural gas environment). Installing remote
actuator vent gas piping does not capture all gas emitted. A
small amount of natural gas still bleeds constantly in the area
around the SVI II AP. Consider the bleeding and releasing of
natural gas when evaluating the Hazardous Clarification for the
area.
NOTE
Area classification is the responsibility of the end user.