Steam barrier

Since competent manufacturers can accurately predict the susceptibility for the formation of the corrosive scale Ni3S2 for any gas analysis, it is possible to implement preventive measures. The preventive measure that is presently being used by Elliott and others is the use of a steam barrier. The principle of the steam barrier design is to inject steam into the inlet and exhaust chambers of the disc/blade area. The injection of steam into both these chambers creates a barrier of... 

The main biosafety features of the fermentation system include the use of steam barriers on double O-ring seals, supply lines and mechanical seals on stirrer shafts, multiple O-ring seals, piping of condensate lines and pressure relief systems to a kill-tank , double (in series) filtration of inlet... 

It has developed a real time method to compare successive non-destructive inspections of the steam generator tubes in nuclear power plants. Each tube provides a safety barrier between the primary and secondary coolant circuits. Each steam generator contains several thousands of tubes whose structural integrity must be ensured through the lifetime of the plant, Therefore, Laborelec performs extensive nondestructive tests after each plant outage. 

Material of Construction (Barrier Material) Heating Water with Steam Heating Water with Heat Transfer Oil CooHng Organic Liqitid with Water Cooling Viscous Organic Liqitid with Water... 

Before insulation is installed, carbon steel surfaces between 32°F and 200°F (0°C and 93°C) should be prepared and painted in accordance with manufacturer s recommendations. A vapor barrier should be provided over the outer layer of the insulation. Minimum thickness of insulation for fireproofing should be 2 in (5 cm). Moisture contamination to the insulation should be avoided to prevent damage to the insulation as a result of steam pressure caused by a fire. 

The Dual Auger system is an in situ treatment for soils contaminated with volatile organic compounds (VOCs), chlorinated volatile organic compounds (CVOCs), and inorganics. This process uses specialized equipment to mix soil and inject reagents. The system can add nutrients to promote bioremediation, inject steam to volatilize contaminants, install zero-valent iron to promote chemical treatment, or add a pozzolanic slurry to stabilize the contaminants. The injection and mixing process effectively breaks down fluid and soil strata barriers. Mixing also eliminates pockets of contamination that would otherwise remain untreated. 

The technology requires the site to have a barrier layer below the depth of contamination. Dependent upon the type of contamination, this layer can be either a high-permeabiUty layer, a low-permeability layer, or the water table. Low-permeabUity sods can isolate the contaminants from contact with the steam, and thus impede contaminant recovery. 

Cannot be applied near the ground surface unless a cap or low-permeabUity barrier exists to maintain steam injection pressures. 

Treatment of DNAPLs may be limited unless a barrier exists or can be created to prevent downward migration of contaminants during treatment. The DUS technology cannot be applied to contaminated soil near the surface unless a cap exists because steam injection pressures cannot be maintained. Treated soils can remain at elevated temperatures for months and even years after cleanup, which could affect site reuse plans. 

---