Mist installation

Electrode insulators must also be designed for a particular service. The properties of the dust or mist and gas determine their design as well as the physical details of the installation. Conducting mists require specif lowances such as oil seals, energized shielding cups, or air bleeds. With saturated gas, steam coils are frequently used to prevent condensation on the electrodes. 

Oil mist explosions have often occurred in the crankcases of reciprocating engines. They can be prevented by installing relief valves. 

These may be direct (i.e. installed within the conditioned room) or indirect (i.e. installed in the conditioning plant). Water may be introduced (a) as a spray or mist or (b) as steam generated separately or by a device within the plant. 

At 5 15 on the morning of September 1, 1939, mist clung to the little Polish village of Puck, on the shoulder of the Hel Peninsula, northeast feature of the Polish Corridor. A few miles to the south, the Free City of Danzig was restless from recent Nazi demands. The fishermen and shopkeepers of Puck slept well. There were no military installations near-by, and their village was only a small fishing port where an invasion by sea could not be made. 

Although intended primarily for air-conditioning applications, these units have been successfully applied to the collection of relatively nonconducting mists such as oil. However, other process applications have been limited largely to experimental installations. The large cost advantage of these units over the Cottrell precipitator lies in the... 

General dilution ventilation has the advantage of being relatively cheap to install and operate, but it is most effective only in the control of small quantities of mild to moderately toxic gases, mists, and fumes. It does not eliminate exposure, however, and it does not specifically control the exposure of the worker at the source. Furthermore, because of their relative density, it does not control heavy particulates or high density metal fumes, nor can it compensate for local changes in the generation of contaminants. 

Weaving Humiducts on Well Mater ACP-2, ACP-3. Figure 6 shows a weave room test wherein it was not practical to install low solids water. In this test, the atomizers were either operated normally or turned off for 30 to 45 minutes (ACP-2) or the looms stood and the atomizers were left on and turned off (ACP-3). The air-conditioning consists of humiducts operating on relatively high water hardness. The humiducts had good return air filtration but no mist elimination. 

Install a recirculating pump with a mist system for enhancement of evaporation in more humid climates. 

Some pumps have easily exchangeable filter cartridges that not only hold back oil mist, but clean the circulating pump oil. Whenever the amount of water vapor present is greater than the water vapor tolerance of the pump, a condenser should always be installed between the vessel and the pump. (For further details, see Section 2.1.5)... 

Oil mists traveling at high velocity have been successfully photographed by Deryogen and Vlasenko (2V), who have provided a let-up zone in the direction of vision. Engel (3V) describes the photography of gas turbine sprays and suggests that a new nozzle should always be tested in the atmosphere prior to installation. 

Gas outlets. Sufficient liquid disentrainment from the overhead gas is usually required. This may be achieved by providing sufficient vertical height above the top tray, installation of mist eliminators, or providing external knockout facilities downstream of the column. 

In terms of limitations, the echo will be reduced if the vapor space is dusty or contains foam, water vapors, or mists. In addition, one should not use them to detect sound-absorbing (fluffy solids), sloping, or irregular surfaces. Therefore, the best guide for using ultrasonic level instruments is past experience on similar installations. 

Following the historical development of electrical engineering and explosion protection, zone classification was the objective of national standards and installation rules. Most of the leading industrial countries established an installation practice for chemical plants and the oil and gas industry with two or three zones for areas hazardous due to gas- or vapour-air mixtures and two zones for areas with hazardous dust-air mixtures. Apart from this philosophy, the coal mining industry in most countries tends to avoid an area classification and defines only one category of explosion protection ( firedamp-proof ). More recent standards or directives present a three-zone concept for areas endangered by combustible gas- (vapour-, mist-) air mixtures and dust-air mixtures in industrial plants (other than coal mines). 

Fig. 9.3. Acid mist removal candle filter being installed atop a stainless steel H2SO4 making tower. It is one of many. Exiting gas passes inward through the candle fabric and out the top of the candle - then out of the tower. The acid mist is caught in the candle fabric by impact, diffusion and Brownian forces (Brink, 2005 Friedman and Friedman, 2004 Lee and Byszewski, 2005 Ziebold and Azwell, 2005). The large total area of the candles gives a low gas velocity through the fabric, which allows 99+% capture of the mist. The captured mist trickles down the fabric and drips back into the tower or into collection pipes (Outokumpu 2005).

No Flow (Gas Out) Line ptuovad (l.e., mist pad collapses) System goes Into recycle PIC-30 releases upstrean flow to flare pressure buildup in vessel PSV-401 Consider Installing PSV-401 directly an vessel Slock valve to be Installed ipstreaa and downstream of PSV for servicing NOTE PSV-401 Installed refer to revised PUD Rev. S NOTE Olock valve installed refer to revised PUD Rev. PSV-401 located on line and uill not relieve If line plugged out of vessel... 

EDV A wet-scrubbing process for removing sulfur dioxide, sulfuric acid mist, and catalyst particles from the effluent gases from FCC units. Developed by Belco Technologies, which had installed 20 units by 2003. 

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