Wet-Dry Vacuum Cleaners


Mercury spills should be cleaned up immediately by use of a special vacuum cleaner. The area should then be washed with a dilute calcium sulfide solution. Small quantities of mercury can be picked up by mixing with copper metal granules or powder, or with zinc granules or powder. To avoid or minimize spills, some plants use steel trays as pallets so that a spih, whether of mercury or a mercury compound, is contained on the steel tray.  [c.116]

These problems can be dealt with by usiag artificial test cloths impregnated with various approximations of natural soils such as vacuum cleaner dust, dirt from air conditioner filters, clays, carbon black, fatty acids, dirty motor oil, and artificial sebum, either alone or ia combination (37,94—98). The soils are appHed by sprayiag, immersion, or padding. If the soils are carefully appHed, reproducible results can be obtained. Soil test cloths can be of great help ia detergency studies, when used with an understanding of their limitations.  [c.536]

The above tests all measure the abdity of a washing system to remove sod from a fabric ia a single wash. However, the detergent or washing machine is often judged by the way the linen appears after several sod-wash cycles. After a series of soilings and washings, the linen acquires an off-white gray or yellowish shade caused by sod accumulation and chemical changes ia the sod. Although sod accumulation tests are more tedious than sod removal tests, they give the most reaHstic results. A laboratory-scale sod accumulation test usiag vacuum cleaner dirt and small swatches of fabric has been described (105).  [c.536]

Inspect the reservoir interior for rust and other deposits. Remove any rust with scrapers and wire brushes, wash down the interior with a detergent solution, and flush with clean water. Dry the interior by blowing the surfaces with dry air and use a vacuum cleaner to remove trapped liquids.  [c.553]

Examples of applications in the automotive industry include instrument panels, air vents and ventilation systems, cowl panels, wheel covers, rear light chassis, headlamp housings, central electrical control boxes, electroplated insignia, loudspeaker grilles, double rear spoilers and window trim. Electrical applications include fuse switch housings, plug connectors, safety sockets, fuse switch housings, power distribution fittings, control switch housings, thermostat housings, switches, appliance connectors and telephone dials. The alloys are also used for housings of typewriters, small radio receivers and hair dryers, steam iron handles and vacuum cleaner motor bearings.  [c.578]

Use of a vacuum cleaner or damping techniques to minimize dust generation.  [c.138]

Fabric filters, more commonly called baghouses or dust collectors, have been in use since the early 1900 s in the mining industry. Today s applications extend throughout the chemical process industries with considerable emphasis in industrial air pollution control. Dry dust filters are available in sizes ranging from a few square feet up to several hundred thousand square feet of cloth. Gas flows that can be handled by individual units range from under 100 cfm to over 1,000,000 cfm. The fabric filter s design is similar to that of a large vacuum cleaner. It consists of bags of various shapes constructed from a porous fabric. Filter bags are available in two major configurations, namely, flat (envelope) bags and round (tubular) bags. Figure 1 illustrates the operation of a baghouse. The dust-laden gas enters the module through an inlet diffuser that breaks up the gas stream and evenly disperses the dust. Tlte heavier dust particles settle into the hopper and the fine particles rise through the tube sheet into the bags.  [c.335]

Cloth-filter collectors A mechanical method of filtration of particulate matter from a gas stream by the use of a number of doth bags. Its operation is similar to a vacuum cleaner method of removal.  [c.1422]

Electric motors are found in nearly every room of a typical house. They power everything from the washing machine, refrigerator, and vacuum cleaner, to the hair dryer, fan, garage door opener, and disk drive in a computer. In an automobile, motors adjust seats, raise an antenna, operate windshield wipers, adjust mirrors, run fans, start the engine, and someday may replace the internal combustion engine under the hood. There is probably no device more useful for doing work than electric motors, and their pervasiveness will surely grow.  [c.742]

Air-cooled surfaces may be cleaned by brushing off the accumulation of dust and fluff where the air enters the coil, by the combination of a high-pressure air hose and a vacuum cleaner, or, with the obvious precautions, by a water hose. Foaming detergents are also used.  [c.76]

It is the responsibility of the supplying contractor to ensure that the user is aware of the need to clean or replace air filters and knows how to carry this out and when. Spare filters should be available so that the change of clean for dirty can be made in the one operation and the dirty filters taken away in closed bags for cleaning or disposal, to prevent release of dirt in the conditioned area. It is an advantage if the person changing the filters has a hand vacuum cleaner to pick up dirt which may become dislodged, and to clean the filter frames.  [c.340]

Vacuum arc remelting often is used to develop optimum solidification stmctures. Electroslag remelting, which utilizes a molten pool of slag in which the electrode is immersed, yields a cleaner and purer material.  [c.121]

Waste Handling. Housekeeping procedures in general can have a significant impact on employee exposure, and certain waste handling procedures can result in very serious exposure if proper precautions are not taken. The best way to keep a plant clean is to not spill in the first place. Management reviews of the origins of spills and accumulated debris not only keep the plant cleaner but prevent loss of valuable material, save cleanup labor, and reduce fire and other safety hazards. Spilled materials in aisles and on walkways can become airborne by redispersion and can be spread onto surfaces and result in skin contact. Dry powders are best cleaned up with either installed or portable industrial vacuum cleaners. Liquid spills can be soaked up using a number of available solvents, and scraped or shoveled into containers. Careful consideration should be given to the methods used to clean floors. Serious worker overexposures have resulted from the use of volatile solvents on large floor areas inside buildings.  [c.106]

Both materials and process substitutions have been used to try to limit wastes while providing favorable performance and costs. One problem is that most of the vacuum or controUed atmosphere deposition methods have much higher equipment and operating costs than do electroplating or hot dipping. Moreover, electroplating gives better coverage on complex-shaped parts, and usually is much faster. The focus of most electroplating processes has been to eliminate the use of the most toxic compounds such as cyanides. Cleaners in general have undergone extensive transformations, with emphasis on formulations having smaller amounts of chelating agents (qv) to improve ease of waste treatment. Other cleaners are designed with surfactants (qv) which displace oil for removal by filters or overflow, rather than surfactants for emulsification of oil. Longer cleaner Hfe and a higher oil content waste for energy recovery has resulted.  [c.139]

Washing. Washing removes pulping Hquor either by dilution and displacing the dirty Hquor with cleaner wash water, termed displacement washing, or by diffusion washing. The latter involves contacting the dirty pulp with relatively clean water for extended periods of time to permit diffusion and desorption of pulping chemicals and organic material from the pores and ceU wall of the pulp. Displacement washing usually involves pressing or vacuum filtration (qv) to assist in removing the dirty water from the pulp being washed. Multiple (typically three) stages in a countercurrent arrangement provide the highest washing efficiency and the lowest shower water dilution. The water must be removed in the evaporator section of the recovery process. Operating variables include the pulp itself, consistency, soHds loading, shower volume and temperature, air entrainment, and foam.  [c.266]

Pharmaceutical Removal of suspended matter is a frequent apphcation for MF. Processes may be either clarification, in which the main product is a clarified liquid, or solids recoveiy. Separating cells or their fragments from broth is the most common apphcation. Clarification of the broth in preparation for product recovery is the usual objective, but the primary goal may be recoveiy of cells. Cross-flow microfiltration competes well with centrifugation, conventional filtration by rotaiy vacuum filter or filter press and decantation. MF delivers a cleaner permeate, an uncontaminated, concentrated cell product which may be washed in the process, and generally gives high yields. There is no filter-aid disposal problem. Microfiltration has higher capital costs than the other processes, although total cost may be lower. The recovery of penicilhn is an example of a process for which cross-flow microfiltration is generally accepted.  [c.2046]

SAN resins are random, noncrystalline copolymers of styrene and acrylonitrile (69). These materials are manufactured by emulsion, suspension, or continuous mass polymerization. Polymer properties are adjusted by varying molecular weight and styrene-acrylonitrile ratio. Significant producers are Dow (Tydl) and Monsanto (Lustran SANZI) (70). SAN copolymers are typically tougher and stronger than polystyrene. The presence of acrylonitrile imparts high heat deflection and chemical resistance to the copolymer. The important markets for SAN employ its excellent transparency, chemical resistance to common foods and detergents, and heat resistance sufficient to withstand dishwashers. Thus SAN is used primarily in housewares (tumblers, salad bowls, serving trays, etc) and appHances (refrigerator drawers, vacuum cleaner parts, washing machine detergent dispensers). Other important markets for SAN include automotive uses (dashboard components), furniture (chair backs, seats, lamps), medical disposables (parts for kidney dialysis equipment), packaging (containers, closures, dispensing parts), and alloys (blends with ABS and PVC (69)). In 1990, the total U.S. consumption of SAN was 60,000 t (71) (see AcRYLONITHILE POLYAffiRS).  [c.185]

Polycarbonates have proved attractive in domestic appliances. Examples include food processor bowls, coffeemaker cold water reservoirs, vacuum cleaner housings, food mixer housings, power tool housings, hair drier and electric razor housings, and microwave cookware.  [c.577]

Staub-luft, /. dust-laden air. -maske, /. dust mask, -mehl, n. (fiom) mill dust, dustings, -ol, n. fioor oil. -sand, m. very fine sand, sand dust, -sauger, m. dust suction apparatus, vacuum cleaner, -schutzmaske, /. dust mask.  [c.425]

Ease of fabrication is the reason that 304S14 is preferred for most other domestic items including kitchen cabinets, food storage cabinets, refrigerator parts and trim, washing machine parts and trim, vacuum cleaner parts and trim, decorative ware, serving dishes etc, and, of course, sinks and drainers. For many of these 430S17 is satisfactory, but the need for heat treatment after fabrication by welding is a disadvantage in some instances.  [c.554]

Dry impingement filters cannot be effectively cleaned and will usually be replaced when dirty. Thin filters of this type are used on some package air-conditioners and much of the dirt can be dislodged by shaking, or with a vacuum cleaner. The problem of air filtration on small packaged units is the low fan power available and the possible neglect of maintenance. Since users will be reluctant to buy new filters when needed, some form of cleanable filter is employed. One such type is a plastic foam. Where replaceable filters are used, it is good practice to always have a complete spare set ready to insert, and to order another set when these are used. This avoids the inevitable delay which will occur if new filters are not ordered until the need is urgent.  [c.295]

Cleanliness is critical in modem superaHoys because of the role of inclusions in initiating fatigue cracks and fracture. Several refining processes to produce cleaner superaHoys have been introduced, including the use of ceramic-foam filters in conjunction with vacuum induction melting, the reintroduction of electroslag remelting, and the development of electron-beam cold-hearth refining (43). Directional solidification (DS), in which heat withdrawal is made to occur paraHel to the ingot axis, has been introduced to produce large columnar grains paraHel to that axis. The technique, which resembles the Bridgeman method for growing single crystals, produces increased ductHity at intermediate temperatures (760°C), improved mpture strength in thin sections, and improved low cycle fatigue life. MarM-200 (Table 5) is the principal aHoy to which the DS process has been appHed. Compositional control also can be utilized for improved castabHity and properties, as in the case of hafnium additions to MarM-200, or the replacement of carbon by 0.1% boron in some newer casting superaHoys.  [c.121]

Nickel alloys that are heavily alloyed with other elements including the nickel-base and iron-base superaHoys, also are produced by vacuum-iaduction melting (VIM). In the VIM process, the melting, akoyiag, melt treatments, and ingot casting are carried out under vacuum. Industrial VIM furnaces generally can process up to 20-t batches. For further alloy refinement, VIM castings are used as electrodes and are ESR- or vacuum-arc remelted (VAR). Investment castings of the chemically complex nickel-base alloys, especially those containing the reactive elements aluminum and titanium, also are carried out under vacuum. More recentiy, directional solidification techniques, ia which the heat is extracted directioaaHy through a coatroUed solidification rate and temperature gradient, are used to produce either monocrystalline nickel-base superaHoys or polycrystalline stmctures having long columnar grains. Gas powder-atomizing techniques, which iavolve VIM master melts, also are used routinely to produce fine nickel-base powders for subsequent powder metallurgical consoHdation of near-net-shape components. Melting technologies involving electron-beam and plasma melting are also being used to melt nickel alloys (see Plasma technology).  [c.6]

Figure 23 illustrates a countercurrent washing system. Either pressure or rotary vacuum filters may be used. The pulp in the blow tank has a consistency between 9 and 11%, depending on whether it came from a continuous or batch digester, respectively. The pulp is diluted in steps to about 1% before entering the first washer vat. It is extracted to about 10% by thickening. Washing Hquid from the showers is displaced through the pulp sheet. The pulp is reextracted and then discharged to the next stage. Pulp consistency on leaving any filter stage varies between 9 and 18%, depending on the equipment used. This procedure is repeated for each step or stage in the countercurrent system. Fresh or process water is appHed in the last, ie, the third, stage. The thick recovered soHds are sent to the evaporator off the first-stage black Hquor tank. Excess water in any stage removed from the pulp is recycled to the showers of the preceding stage. The dilution factor, typically 2—4 1 water to pulp on a weight basis, is the net water that is added to the washing system. The higher the dilution factor is, the cleaner the pulp and the lower the chemical (soda) losses, but also the greater the amount of water to be evaporated from the residual Hquor in the chemical recovery system. Figure 19 shows the diffusion ring washing used in the Kamyr system. Therein fresh wash water is fed to the second stage of washing where it contacts the pulp for an extended period (1—2 h) and then is sent to the top filtrate tank. From there, the wash water goes to the first stage of diffusion washing for another 1—2 h of contact, back to the filtrate tank, and eventually to the bottom washing 2one of the digester via a filtrate tank.  [c.266]

Vacuum melting procedures are employed ki produckig beatiag steels to minimize oxides, other nonmetaUic kiclusions, trapped gases, and trace elements present ki conventional stmctural alloys (42). With these cleaner steels and improved refining techniques providing fewer initiation sites for fatigue cracking, fatigue life improvement can range up to 3—20 times the values redected ki traditional catalog ratings for ak-melted 52100 and other beating steels.  [c.9]

Equipment may get washed with a steam jenny and allowed to air dry on plastic in a more remote area. We need to keep in mind that steam cleaners have the potential to cause substantial physical harm. The combination of high-pressure water and high temperatures can be dangerous. Wlien this is coupled with a worker standing on visquine or plastic, it becomes a slip, trip, and fall situation. Situations compounded with respiratory and whole-body protection, such as saranex or rubber suits and gloves, add in the potential for poor vision, heat stress, and the lack of physical dexterity. Keep these issues in mind prior to steam cleaner activity.  [c.82]

Fixed Duct/Tubing The ducts for LVHV systems ordinarily consist of steel tubing designed to minimize turbulent pressure losses and convey airborne dust to an air cleaner. The type of steel-tubing duct that is used in cen tral vacuum cleaning systems is good for LVHV applications. It is designed with long-radius turns and smooth inside joints between the fittings and straight duct sections. The duct fittings have expanded ends to allow a slip-fit with the straight duct and a smooth joint on the inside surface of the duct. The slip-fit components are positioned and welded to create a strong and smooth airflow system.  [c.864]

Air Cleaner/Dust Collector There are a wide variety of possible types of air-cleaning equipment for LVHV systems. The most common is a fabric dust collectot, having a vertical cylindtical baghouse design. This type is common in large central vacuum cleaning systems. Other types of fabric collectors can also be used. For applications involving substantial amounts of large dust particles, it is usually a good idea to have a cyclone-type primary separator upstream of a fabric collector.  [c.865]

Figure 10.30 illustrates a multiple-stage exhauster and smooth-flow duct (pneumatic tubing) components. It also includes pictures of air cleaner-exha uster-motor installations located outside of buildings and connected to LVHV (or central vacuum cleaning) systems inside the buildings.  [c.865]


See pages that mention the term Wet-Dry Vacuum Cleaners : [c.198]    [c.901]    [c.208]   
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Avoiding static ignition hazards in chemical operations  -> Wet-Dry Vacuum Cleaners