Pressurized barrier gas control system .
Gas seal support typically nitrogen barrier gas
Isolate process fluid .
Zero process emissions .
Used with dual pressurized gas seals .
High vapor pressure fluids ,light hydrocarbons
Services that do not tolerate liquid barrier seals .
Clean ,non-polymerizing fluids
Moderate temperature fluids .
Clean ,reliable ,pressurized gas must be supplied to seal at all
Barrier pressure is typically at least 1.75 bar ( 25psig )above
seal chamber pressure .Flow indicator shows both inboard
and outboard seal leakage .
Bottled gas supply is not recommended except as part of
emergency backup system