Appendix B. Installing An Svi Ii Esd In A Natural Gas Environment - GE Masoneilan SVI II ESD Installation And Maintenance Manual

Appendix B. Installing an SVI II ESD in a Natural Gas
Environment
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The interior of the SVI II ESD is positively pressured with the supply medium. Appropriate
safety measures must be taken to handle pressurized natural gas that may enter the
electrical conduit or cable system.
WARNING: EXPLOSION HAZARD- A missing or improperly installed conduit seal, cable
seal or cable gland could leak natural gas into the area around the SVI II ESD install
area or into any area where the conduit is present.
Ensure natural gas that is vented from the SVI II ESD dissipates quickly. The pneumatic
control system constantly bleeds a small amount of the natural gas into the area around
the SVII I ESD from the positive pressure vent(s) (see images for bleed vent locations). Also,
during an actuator vent cycle (actuator pressure relief), natural gas from the actuator is
released into the area around the actuator vent port (see images for actuator vent
locations) unless the unit is connected to remote vent gas piping (see "Remote Gas
Piping"). Both sources of natural gas (positive pressure bleeding and actuator venting)
must be considered when evaluating the Hazardous Classification for the area.
WARNING: EXPLOSION HAZARD - Positive pressure venting and actuator venting leak
natural gas into the SVI II ESD install area.
Do not attempt to collect the gas from the positive pressure bleed vent. Attempting to
collect the gas from the positive pressure bleed vent may increase the internal pressure,
which could affect performance and compromise the flameproof/explosion proof
protection.
Ensure all covers and other pressure containing components are correctly installed before
putting or returning unit to service.
WARNING: EXPLOSION HAZARD- An improperly installed cover or pressure containing
component could leak natural gas into the SVI II ESD install area.
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