Uncontrolled zone

An uncontrolled zone is a zone in which the thermal and air purity (quality) conditions are not specified or controlled. 

Note There may also be uncontrolled zones near to the processes inside the main controlled zone. 

Each method has its own design criteria, but common to most ol the methods is that air supply is located close to or inside the controlled zone and the exhaust openings are located inside the uncontrolled zone. The location and power of the buoyancy sources in relation to the supply air jets have a remarkable influence on the accumulations of heat, contaminants, and humidity within the room. 

The key flow elements in the zoning strategy arc the supply air jets, plumes of the buoyancy sources, buoyant airflows along the surfaces, and turbulent mixing between the controlled and the uncontrolled zones, as in Fig. 8.32. These flow elements have significant influence on the effectiveness of the system. 

The plume airflow rate in relation to the extract airflow rate from the uncontrolled zone is low enough to avoid undesired return flow from the uncontrolled zone to the controlled zone. 

The concentration model is based on the air mass flow rate and contaminant flow rate balances in the lower (controlled) zone (Iz) and the upper (uncontrolled) zone (uz). 

NaOH to the slightly acid PRF salt waste to precipitate iron, calcium, and magnesium hydroxides and remove 80-90 percent of the plutonium and >99.9 percent of the 21+1Am and (b) Passage of the clarified alkaline supernate liquor from the precipitation step through a bed of -1+0+11+0 mesh sodium titanate powder to reduce the concentration of both plutonium and 241Am to below their Maximum Permissible Concentration (ll), 0.005 and O.OOU yCi/ , respectively, in water in an uncontrolled zone. The... 

The use of the surface ultrasonic waves seems to be convenient for these purposes. However, this method has not found wide practical application. Peculiarities of excitation, propagation and registration of surface waves created before these time great difficulties for their application in automatic systems of duality testing. It is connected with the fact that the surface waves are weakened by soil on the surface itself In addition, the methods of testing by the surface waves do not yield to automation due to the difficulties of creation of the acoustic contact. In particular, a flow of contact liquid out of the zone of an acoustic line, presence of immersion liquid, availability of chink interval leads to the adsorption and reflection of waves on tlie front meniscus of a contact layer. The liquid for the acoustic contact must be located only in the places of contact, otherwise the influence on the amplitude will be uncontrolled. This phenomenon distorts the results of testing procedure. 

Catastrophic Incident An incident involving a major uncontrolled emission, fire or explosion that causes significant damage, injuries and/or fatalities onsite and have an outcome effect zone that extends into the surrounding community. 

Lappala, E. and G. Thompson. Detection of Groundwater Contamination by Shallow Soil Gas Sampling in the Vadose Zone and Applications. In Management of Uncontrolled Hazardous Waste Sites Proceedings, Hazardous Materials Control Research Institute,Washington, D.C., 1984. 

Capture zones are zones in which source emissions will be captured by a source-capturing system, and where the capture efficiency is determined and shall be maintained over the working period. From the pollutant concentration point of view, the capture zone is uncontrolled (e.g., workers shall not enter a capture zone without additional protection). 

Polymerization High viscosity may cause problems with heat removal from the reaction zone, reaction often uncontrollable... 

Nathan and Rintoul [23], when studying the solubility of nitroglycerine in mixed acids, found that compositions with the ratio HzO HN03 = 1.1 and sulphuric acid content from 0 to 60% are particularly dangerous in this respect they readily produce an uncontrollable reaction, and no acid of a composition in or near this zone should ever be allowed to come in contact with nitroglycerine in a manufacturing operation. This extremely important observation was recently studied in detail by Oehman et al. [110], (see Fig. 26, p. 84). 

A simultaneous ultrasonic treatment of the reaction phase (with ultrasonic cleaner Bransonic 12 was carried out in all experiments using a weak source of ultrasound in order to eliminate formed products from the metal surface and thus stabilize the current in the process. Stronger sources of ultrasound have not been used to avoid turbulent processes and the uncontrolled superheating of the reaction zone. 

The use of a flash valve will further ensure a constant feed of the polymer solution into the ZSK to avoid uncontrolled degassing of the process material in the supply line to the ZSK. A pulsating intake would not permit a stable process in terms of safe operation of the degassing zones and stable pelletizing of the degassed polymer. 

Sugar-boiling for proper crystallization is done in the metastable and intermediate phase below the metastable zone, crystals dissolve and inefficiencies result above the intermediate phase, uncontrolled false grain or extra, small, and agglomerated crystals form, resulting in poor-quality crystals. When the syrup is in the metastable phase, it is seeded that is, a predetermined amount... 

A certain bias in correct K determination can be introduced by stacking of the sample zone, occurring when the injected sample has an ionic strength less than BGE. Stacking leads to an uncontrolled increase in concentration of the interacting reagents which may disturb equilibrium [6]. 

Prior to the start of any production activity, materials and components must be transferred from a warehouse environment into a classified environment. For most items this will necessitate removal from boxes or cartons, transfer to a nonwooden pallet, and passage through an air lock which serves as the transfer system between the controlled and uncontrolled environments. Often components are contained within plastic bags within a box or carton, and in some cases there are multiple bag layers to facilitate disinfection and passage through air locks into different zones of operation within the aseptic area. The firm may utilize an external disinfection of the materials in conjunction with this transfer. The concern is for minimization of particles and bioburden on these as yet unprocessed items in order to protect the controlled environment. 

An important capability of Curie point pyrolysers should be that the sample does not suffer any modifications before the pyrolysis step itself. As previously indicated, the housing of the pyrolyser must be heated (commonly with electrical resistances) to avoid condensation or other modifications of the pyrolysate. However, because a waiting time is inherent between the moment of sample introduction in the pyrolyser and the start of the pyrolysis itself, the sample may be heated by radiation from the sample housing. Several Curie point pyrolysers [8b] have the capability to drop the ferromagnetic foil containing the sample from a cool zone into the induction area, which is pre-heated to avoid condensation. The pyrolysis takes place immediately after the sample is transferred into this induction area such that no uncontrolled preliminary sample decomposition takes place. 

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