Enclosures


Figure 3.6 shows four examples of cake filtration in which the filter medium is a cloth of natural or artificial fibers or even metal. Figure 3.6a shows the filter cloth arranged between plates in an enclosure. Figure 3.66 shows the cloth arranged as a thimble. This arrangement is common for the separation of solid particles from vapor and is known as a bag filter. Figure 3.6c shows a rotating belt for the separation of a slurry of solid particles in a liquid, and Fig. 3.6d shows a rotating drum in which the drum rotates through the slurry. When filtering solids from liquids, if the purity of the filter cake is not important, filter aids, which are particles of porous solid, can be  [c.73]

In the standard method, the metal enclosure (called the air chamber) used to hold the hydrocarbon vapors is immersed in water before the test, then drained but not dried. This mode of operation, often designated as the wet bomb" is stipulated for all materials that are exclusively petroleum. But if the fuels contain alcohols or other organic products soluble in water, the apparatus must be dried in order that the vapors are not absorbed by the water on the walls. This technique is called the dry bomb" it results in RVP values higher by about 100 mbar for some oxygenated motor fuels. When examining the numerical results, it is thus important to know the technique employed. In any case, the dry bomb method is preferred.  [c.189]

Some of the most interesting work in this area has involved physisorbed molecules at temperatures as low as 4 K [75]. Note that it takes a specialized instrument to be able to operate at these low temperatures. An STM tip is brought into contact with the physisorbed species by lightly pushing down on it. Then, the STM tip is translated parallel to the surface while pressure is maintained on the adsorbate. In this manner, tire adsorbates can be moved to any location on the surface. Manipulation of tliis type has led to the writing of IBM with single atoms [76], as well as to the fonuation of stmctures such as the quantum corral [77]. The quantum corral is so named, as it is an oval-shaped enclosure made from adsorbate atoms that provides a barrier for the free electrons of the metal substrate. Inside the corral, standing wave patterns are set up that can be imaged with the STM.  [c.311]

Figure 5.1 The reaction of A and B groups at the ends of two different chains. Note that rotations around only a few bonds will bring A and B into the same cage of neighboring groups, indicated by the broken line enclosure. Figure 5.1 The reaction of A and B groups at the ends of two different chains. Note that rotations around only a few bonds will bring A and B into the same cage of neighboring groups, indicated by the broken line enclosure.
For some appHcations it is desirable to prepare aerogels as thin films that are either self-supporting or supported on another substrate. AH common coating methods such as dip coating, spin coating, and spray coating can be used to prepare gel films. However, for highly porous films (ie, porosity > 75%), special care is necessary to minimize the rate of solvent evaporation both during and after gel formation. One way to do so is to perform the coating processes within an enclosure that is fiUed with the saturated vapor of the working solvent and a partial pressure of ammonium hydroxide that catalyzes the gelation of the films (41). The subsequent supercritical drying step can be done in either alcohol or carbon dioxide. The choice depends on the desired properties of the aerogels and, in the case of supported films, the thermal stabHity of the substrate materials.  [c.4]

Discharge electrodes must be tensioned to hold the wire taut and maintain spacing. Tensioning may be accompHshed by attaching a weight (5—10 kg), held in a weight-spacing frame to reduce sway, to the bottom of each wire. In some European designs, now offered in the United States, the wires are stretched between light-weight high-tension pipe frames. The wires may be heavy barbed ribbons that are unlikely to fail from arcing, an important aspect since no provision is made for wire replacement in these rigid frames. The wire supporting frames are hung from high voltage insulators in suitable enclosures on top of the precipitator. Dust, fumes, and mist must be prevented from entering these insulator compartments and coating the insulators with a conductive film. The insulator compartments may be purged with clean air and heated to prevent condensation. In a mist precipitator, Hquid drains from the collecting surfaces, but a dry dust precipitator must be rapped at intervals using a weight, hammers, or vibrators. The dust, broken loose from the surface, sHdes down the plate into the dust hoppers. Dust is removed from the hoppers, usually batch-wise, with suitable conveyors. A precipitator s power supply is usually rectified ac.  [c.399]

In the cast loading of large booster rockets, the motor is fixed in a vertical position and surrounded with necessary handling gear to faciUtate subsequent operations. Very large motors are inserted in huge cylindrical pits. A shroud or similar enclosure may be used to surround the motor so that dry, warm air can be passed into it to preheat the motor and control the temperature of the casting and curing operation. The central mandrel required for grain geometry is inserted into the motor with controls for rigid alignment to close tolerances. The exact casting technique used depends on the rheological characteristics of the propellant and the quantity being processed. Several methods are commonly used for large grains including bayonet, bottom, and vacuum casting.  [c.49]

Fans and blowers are the most widely used mechanical devices for moving air and gases in both large and small volumes (21). Uses include ventilation, mechanical draft for combustion (including forced- and induced-draft fans and primary- and secondary-air fans), local exhaust for fume and dust containment at hoods and equipment enclosures, forced- and induced-draft cooling for spray towers, cooling towers and ponds, and air-cooled heat exchangers, and conveying of soHds (see also HeaT-EXCHANGETECHNOLOGy). Other appHcations include air or gas movement in dryers, gas-recirculation fans, air supply for air curtains and air-blast operations, and a great many miscellaneous process industry uses often involving hot and corrosive gases. The range of performance required by fans for these various appHcations is enormous. Most ventilating appHcations require pressures ranging from 25 to 1500 Pa (0.1—6 in. of water). Induced-draft fans must often handle gases of 150—425°C containing various levels of suspended erosive particles. Such fans are frequendy equipped with replaceable wear pads of abrasion-resistant materials or are coated with wear-resistant surfaces.  [c.114]

Another option available with rotary vacuum dmm filters is fiiU enclosure. This enables operation under nitrogen or other atmospheres, for reasons such as safety, prevention of vapor loss, etc. Enclosure may also be used to prevent contamination of the material being filtered or to confine the spray from washing nozzles. The rotary dmm filter also can be enclosed in a pressure vessel and operated under pressure.  [c.397]

Fluorine is used by a number of manufacturers to produce polyolefin containers that are resistant to permeation by organic Hquids. In one apphcation, the air which is normally used to blow-mold containers is replaced by a low concentration of fluorine in a mixture with nitrogen. In another approach, the containers are placed in a large enclosure subsequently flooded with very dilute fluorine—nitrogen or fluorine—air mixtures. Containers may vary in size from small bottles to automotive fuel tanks and show an outstanding resistance to nonpolar solvents and fuels. However, fuels containing polar additives, eg, alcohols, have been more difficult to contain and tank manufacturers are modifying the polyolefin and the fluorination process in an effort to meet Environmental Protection Agency (EPA) mandated fuel loss guidelines.  [c.131]

Direct-heat electric furnaces use the material to be heated as the resistor, and the furnace consists of an insulated enclosure to retain the heat, a power source of suitable voltage, and means of attaching the power leads to the work (Fig. 8). This type of furnace has several limitations that have prevented widespread use. Since the work is the resistor, it must have a uniform cross section between power connection points, and the material must be homogeneous. Varying sections or nonuniformities in the material can produce hot or cold spots in proportion to the change in electrical resistance. Also, a given furnace must be designed for work in which each piece to be heated has about the same resistance and power requirements. Although voltage and power can be controlled, a furnace designed to heat a part with a given cross section and length probably does not have the voltage required to heat a part of twice the length and half the cross section or have the current capacity to heat a part of half the length and twice the cross section.  [c.138]

A furnace is a device (enclosure) for generating controlled heat with the objective of performing work. In fossil-fuel furnaces, the work appHcation may be direct (eg, rotary kilns) or indirect (eg, plants for electric power generation). The furnace chamber is either cooled (waterwaH enclosure) or not cooled (refractory lining). In this article, furnaces related to metallurgy such as blast furnaces ate excluded because they ate coveted under associated topics (see  [c.140]

H. C. Hottel and E. S. Cohen, "Radiant Heat Exchange in a Gas-EiUed Enclosure," paper presented at ASME/AIChE Joint Heat Transfer Conference, University Park, Pa., Aug. 1957, AIChE Paper No. 57-HT-23.  [c.148]

When burning hazardous vapors requiring destmction of the molecular species to less than 5—10 ppmv, an open flare may not maintain the combustible gases at a sufficiently high temperature for a sufficient period of time to meet such requirements. Either pretesting of flares should be made, or the flare should be enclosed in an open-ended refractory chamber to maintain combustion temperatures. For occasional emergency releases, an enclosure built of refractory brick gives inadequate destmction until the refractory is heated to high temperatures. Maintaining a refractory lining at operating temperature with an auxiHary fuel over a long period of time can be very energy consuming.  [c.59]

Inclusion compounds open up a wide area of applications (1,2,17—28). An important aspect in this connection is the specific microenvironment created by the host enclosure of the guest which exerts an influence on the physical, spectroscopic, chemical, and other properties of the guest.  [c.75]

Enclosure also changes the redox properties of a compound, its color, and other physical properties (1,2). On this basis nonlinear optical materials, luminescence markers, controlled light switches, and other high-tech devices might be designed and prepared (15,17,137).  [c.75]

Catalyst charging and topping is an occasional task typically done at the top of a reactor using temporary handling faciUties. For this reason local exhaust ventilation is rarely used even when the operation may be dusty and the catalyst toxic. Scmpulous use of personal protective equipment and adherence to work practices is essential to minimize exposure. Respiratory protection can be so critical as to require air-line respirators skin protection may include full protective suits. When catalysts are dumped from a reactor these may be very dusty because of particle size reduction occurring in the reactor and because of handling. Dumping is often done via chutes, which do a poor job of containing the dust. In addition to protecting the workers, it may be necessary to erect a temporary enclosure to prevent contamination of adjacent work areas. Some catalysts being dumped are pyrophoric. Water sprays used to prevent fires also help control the dust. When catalyst beds are rendered inert, the danger of a release into the work area of large amounts of the inerting gas, which may cause asphyxiation, exists. Most catalyst removal operations are carried out by experienced contractors using special equipment and techniques. It is important that plant personnel not undertake this or any job for which they are not properly trained or equipped. The hazard from what comes out of a reactor may be quite different and much more severe than that from the catalyst that went into the reactor.  [c.106]

Options. Traditional control options for overexposure are material substitution, process change, containment, enclosure, isolation, source reduction, ventilation, provide personal protection, change work practices, and improve housekeeping. A simple way of looking at selection of control options is to find the cheapest option that results in the desired amount of exposure reduction. It is not actually that simple, however, because the various options differ in ways other than cost and degree of control. Some of the other factors to consider in selection of control options are operabiUty, rehabiUty, and acceptabihty.  [c.110]

Operability. Hidden costs may result from changes in the way a process operates as a result of a control. For example, enclosure and isolation may diminish the abiUty of workers to observe the process. Upsets and dismptions resulting from this loss of intelligence are expensive and generate resistance to the use of these controls, no matter how effective.  [c.110]

Dosage. The dosage of fumigant is commonly expressed as lb/1000 ft or in mg/L. Successful fumigation results from the attainment of a critical (C/) value (product of the concentration of gas in mg/L x the exposure duration in h), ie, that which will kill at least 99% of the insect population. Within moderate limits, therefore, the longer the exposure, the lower the concentration of gas necessary. In practice, the exposure time is limited by the escape of gas from the enclosure and convenience in treatment the minimum concentration is limited by the abiUty of the pest to detoxify the gas at low dosages as rapidly as it is sorbed. The dosage and the attainment of a critical C/value are dependent on the rate of volatilisation of generation of the fumigant and the nature of the commodity being fumigated. Some fumigants, eg, methyl bromide, are highly reactive with proteins and are rapidly sorbed by grain, flour, or seeds. From 10—32°C, the C/value decreases by approximately one half for each 10°C increase in temperature.  [c.299]

Application. The fumigant is appHed to an enclosure that is as gastight as possible. Low boiling fumigants, eg, hydrogen cyanide, methyl bromide, ethylene oxide, methyl formate, and sulfuryl fluoride, are obtained in cylinders of compressed or Hquefted gas which is readily piped into the enclosure. Fumigants that are Hquids at room temperature are volatilised by pouring onto cloths or spraying into the area to be treated. Elaborate metering mechanisms have been developed for spot appHcations of fumigants to moving streams of grain in elevators. Forced recirculation of the fumigant through the commodity being treated improves the distribution of the gas and often is used for the fumigation of stored grains.  [c.299]

Uses. Sound-absorbing materials are frequendy used to reduce reverberation, or the persistence of sound in a space after generation of the sound ceases to reduce focused reflections from concave surfaces to prevent echoes, or delayed sound reflections from distant surfaces and to prevent the buildup of sound by multiple reflections within rooms and other enclosures. Sound-absorbing materials also are used to reduce the transmission of noise from one location to another by multiple reflections from sound-reflecting surfaces.  [c.312]

Sound-Absorptive Blankets. Sound-absorptive blankets of fiber glass or mineral wool are not usually considered damping materials, but when fastened to sheet metal machine enclosures they can provide some useful damping in addition to sound absorption.  [c.321]

R. W. Wright, "High Strength Glass in Service—A Status Report," presented at The Conference on Aerospace Transport Materials and Enclosures, Tech. Report AFML-TR-76-54, Atianta, Ga., 1975.  [c.529]

The main environmental problem is dust control, which requires collection of particulate emissions from point sources and suppression of fugitive dust from a multitude of areas (12). Rotary dryers for drying stone, now operated by few plants, produce by far the most visible and concentrated emission, requiring use of multiple cyclones plus a baghouse or high energy wet scmbber to meet standards. Other point sources of particulates are at each stone-transfer junction, ie, cmshers, grinders, conveyors, screens, and loading. Such dust can be quelled by use of multiple-jet water sprays to keep the stone moist. Special wetting agents are appHed to the water to enhance dustproofing while conserving water. Plants desiring a dry product install protective hoods, baffles, or enclosures at each transfer point. A few plants collect emissions from each transfer point and convey the dust to a single large wet scmbber for treatment. This is the most cosdy method.  [c.170]

Capacitance-based systems can be utilized in hazardous environments in two ways, explosion-proof housings and intrinsically safe circuitry. Explosion-proof housings can be used to contain an explosion that might ignite inside the enclosure. These electronics are usually qualified with certain probes so any explosion does not escape the housing into the atmosphere or back into the vessel. Intrinsically safe circuitry precludes an explosion from occurring by limiting the energy impressed on the probe. At these low energy levels, there is not enough energy to cause ignition. An approved intrinsically safe barrier is installed in the loop in a nonhazardous location to preclude dangerous energy levels from entering the hazardous area even during component failure.  [c.211]

Another modification is the detonation gun process, in which mixtures of oxygen and acetylene are exploded in the combustion chamber. Metal powers are metered into the chamber. The shock wave of the supersonic explosion (2770 m/s) propels the powders to a speed of up to 770 m/s. The 3000°C combustion gases also heat the particles. Bond strength is exceptionally high with low porosities. Most coating materials are oxides or carbides (qv), plus bonding materials of Co and NiCr. Disadvantages of this process include line of sight coating, the danger of the high speed particles, and the explosions, which require soundproof enclosures and remote operation. The detonation gun process is one of the most expensive of the spray coating processes, but coating Life can outlast conventionally sprayed coatings by up to eight times.  [c.135]

In most reactive scattering experiments, the reagent beam sources, which are housed in differentially pumped enclosures, are fixed and cross at a 90° intersection angle, while the detector is rotated about the scattering centre. The stable molecular co-reagent is usually produced in an effiisive or supersonic source of the pure reagent. Care must be taken to ensure that no clusters are fonued in the beam source, for example by heating the source or by limiting the total pressure behind the source orifice.  [c.2066]

Analogue load ceUs have remained fundamentaUy unchanged for over 50 years, but they have been improved gready in their performance and rehabUity. Since the mid-1980s, digital load ceUs have been gaining acceptance in certain appHcations. A digital load ceU has a strain-gauged spring element as described herein, but its output is a robust digital signal. Figure 9 shows a cross section of a typical digital load ceU used in tmck-scale appHcations. It consists of a pin-type spring element that is compressed when loaded. The element is surrounded by an enclosure that is welded in place to provide a hermetic seal. The gauges are wired to a printed circuit board which includes an A/D converter and microprocessor the digital output is through a hermetically sealed connector.  [c.327]

Electromagnetic Force Compensation. Precision balances traditionally were of the form iHustrated in Figure 1. These were very finely made, with agate pivots and bearings and were often housed in an enclosure of glass and highly poHshed hardwood. Today, the principle of electromagnetic force compensation (EMFC), also referred to as magnetic force restoration (MFR), is used where extremely high accuracy is required. The  [c.327]

The largest use of activated carbon is for the purification of air streams. Much of this carbon is used to treat recirculated air in large occupied enclosures, such as office buildings, apartments, and plants. The carbon is incorporated into thin filterlike frames to treat the large volumes of air with low pressure drop. Odors are also removed from smaller areas by activated carbon filters in kitchen hoods, air conditioners, and electronic air purifiers. On a smaller scale, gas masks containing carbon or carbon impregnated with promoters are used to protect wearers from odors and toxic chemicals. The smallest scale carbon filters are those used in cigarettes. In addition to protection from hazardous chemicals in industry, activated carbon gas masks can protect against gas-warfare chemicals. Activated carbon fibers have been formed into fabrics for clothing to protect against vesicant and percutaneous chemical vapors (84).  [c.284]

Horizontal Belt Vacuum Filters. This type of filter (Eig. 11) is another development of the pan filter idea. A row of vacuum pans arranged along the path of an endless horizontal belt was the original patented design. This has been superseded by the horizontal belt vacuum filter, which resembles a belt conveyor in appearance. The top strand of the endless belt is used for filtration, cake washing, and drying, whereas the bottom return is used for tracking and washing of the cloth. There is appreciable dexibUity in the relative areas allocated to filtration, washing, and drying. Hooded enclosures are avaUable wherever necessary. Modular constmction of many designs allows field assembly as weU as future expansion if process requirements change.  [c.395]

Other designs squee2e the cake between two permeable belts or between a screw conveyor of diminishing diameter, or pitch, and its permeable enclosure. The available filters which use mechanical compression can be classified into four principal categories, ie, membrane plate presses, tube presses, belt presses, and screw presses.  [c.404]

Most continuous pressure filters available (ca 1993) have their roots in vacuum filtration technology. A rotary dmm or rotary disk vacuum filter can be adapted to pressure by enclosing it in a pressure cover however, the disadvantages of this measure are evident. The enclosure is a pressure vessel which is heavy and expensive, the progress of filtration cannot be watched, and the removal of the cake from the vessel is difficult. Other complications of this method are caused by the necessity of arranging for two or more differential pressures between the inside and outside of the filter, which requires a troublesome system of pressure regulating valves.  [c.405]

Ambient Carbon Dioxide Concentration. Many studies have been performed which show that higher concentrations of carbon dioxide than are normally present in air will promote more carbon fixation and increase biomass yields. In confined environmentally controlled enclosures such as hothouses, carbon dioxide-enriched air can be used to stimulate growth. This is not practical in large-scale open systems such as those envisaged for biomass energy farms. For aquatic biomass production, carbon dioxide enrichment of the water phase may be an attractive method of promoting biomass growth if carbon dioxide concentration is a limiting factor the growth of biomass often occurs by uptake of carbon dioxide from both the air and Hquid phase near the surface.  [c.32]

In the 1950s, serious problems were experienced in the design of furnaces (qv) to prevent unrestrained gas convection currents which gave rise to very large temperature gradients (76,77) and made furnace control difficult. Figure 13a represents convection currents around an electrically heated furnace tube in an enclosure pressurized by gas. To achieve a uniform temperature over the central section of tube shown in Figure 13b, the furnace was wound in four sections so that the power input to each section could be varied independently. Covers were fitted to the top and bottom of the tube to prevent gas flowing through it, and the charge within the furnace was surrounded by fine dense alumina powder of low permeabiUty. Convection currents on the outside of the tube were largely prevented by a series of impermeable baffles, the volume between the baffles being filled with alumina powder. The performance of the furnace at temperatures up to 1250°C and helium gas pressures of 100 MPa (14,500 psi) was satisfactory (79).  [c.86]

If the kiln may be considered an enclosure bounding an isothermal gray gas of emissivity, S, with two bounding surfaces consisting of reradiating walls of area, and of bed soHds (the radiation sink) of area, then the expression for R becomes (19)  [c.49]

Sa.ndbla.sting, Whereas some modem corrosion-resistant treatments do not require the removal of aH mst, sandblasting to clean metal surfaces prior to coating is very common (see Metal SURFACE TREATMENTS). In addition to the metal dust, the very fine fragments broken off from the abrasive particles may be respirable, that is, capable of reaching the deep lung where these may cause damage. The degree of risk depends greatly on the type of abrasive used. Steel baHs and walnut sheHs produce relatively nontoxic dust, as does aluminum oxide. On the other end, fine dust from sand, which is typicaHy composed of sHicon dioxide, is very toxic and can produce a serious lung disease. The degree of dust exposure from sandblasting depends on the degree of enclosure and the use of personal protective equipment. SmaH pieces can be cleaned in fuHy enclosed blast cabinets having local exhaust ventilation to maintain negative pressure. Large objects, such as tmck bodies, which are too large to be done in cabinets, are often cleaned in large booths using down draft local exhaust ventilation. Eor stmctures and fixed piping, sandblasting is done out in the open. When blasting in either the booths or in the open, the operator should be protected by a special sandblaster s suppHer-air hood. A common problem occurs when the operator uses the hood for physical protection but does not connect the hood to a supply of clean air. When a hood is used in this manner, fine dust can enter the worker s breathing 2one under the hood, and the hood does not provide respiratory protection.  [c.105]

Sources. Although broad-band sources are based on thermal emission, few produce a tme blackbody emission spectmm. Blackbody sources are used for the caUbration of radiometric equipment and as standards for determining absolute emissivities or redectivities. A smaH-aperture blackbody source consists of a large cavity at uniform temperature having a small hole in one wad. Commercial smad-aperture sources have apertures under 25 mm in diameter, operating temperatures between 6 K and 3000°C, and emissivities as high as 0.999 0.0005. Large-aperture sources, essentiady enclosures in which part of one wad is missing, are used for caUbrating thermal imagers. The open nature of such sources reduces precision and raises power requirements relative to smad-aperture sources. Available sources have apertures as large as 4000 cmoperating temperatures up to 600°C, and emissivities exceeding 0.99.  [c.191]

Aerosols (qv) are very finely divided sprays having droplet diameters of l ndash 30 p.m. They are used almost entirely as space sprays for appHcation to enclosures, particularly against flying insects. Aerosols are most conveniendy appHed by the familiar Hquefted gas dispersion or bomb but can be generated on a larger scale by rotary atomi2ers or twin duid atomi2ers.  [c.302]

The minienvironment approach to contamination control has been increasing in use. A minienvironment is a localized environment created by an enclosure that isolates the product wafer from contamination and people (48). Another approach is using integrated processing, where consecutive processes are linked in a controlled environment (32). Both requite in situ sensors (qv) to measure internal chamber temperatures, background contamination, gas flow rates, pressure changes, and particularly wafer temperature (4).  [c.355]

G. L. Wiser, "Sierracin Glass/Plastic Composite Wiadshields," presented at Conference on Transparent Materialsfor Aerospace Enclosures, U.S. Air Eorce and University of Dayton, June 25, 1969.  [c.529]

J. B. Olson, "Design, Development and Testing of a Lightweight Bird-Proof Cockpit Enclosure for the E-111," presented at The Conference on Aerospace Transparent Materials and Enclosures, Long Beach, Calif., Apr. 24—28,1977.  [c.529]

The Kaldo process offers some significant advantages from an emission viewpoint. The reactor can be completely enclosed in a vented enclosure throughout the operating cycle. Operator exposure is then reduced to a minimum because the operation, including charging, slag skimming, and buUion tapping, is controlled from a central control room.  [c.40]

The advantage of vacuum dezincing of desilverized bulHon is that over 90% of the zinc is recovered as metallic zinc. The equipment consists of a steel kettie of suitable capacity and a water-cooled condenser unit which sits over the lead bath and mates with the kettie to make a vacuum-tight enclosure. A vacuum is maintained inside the dezincing chamber which is equipped with a water-cooled condensing pan extending over the top of the chamber. The molten lead is agitated by an impeller.  [c.47]

Most fugitive dust is derived from spillage of stone fines and overburden soil from conveyors, bucket elevators, loading spouts, tmcks, etc from stockpiled-processed stone and spall piles that become air-dried and then wind-blown and from tmck traffic and wind on plant roads. Spillage can be minimized by a variety of practices including not overloading conveyor belts, elevators, and tmcks better coordination of the stone-feed flow reducing conveyor gravity drops use of enclosures at vulnerable transfer points use of retractable loading spouts that fit tightly in circular ports of tank tmcks hberal appHcation of rainbird-type jet-spray systems on stockpiles watering unpaved areas removing dust from paved surfaces with vacuum-cleaning equipment reducing tmck speed or using pneumatic pumplines in place of tmcks. Successful dust abatement requires a weU-supervised, unremitting campaign, supported by all levels of management.  [c.170]


See pages that mention the term Enclosures : [c.157]    [c.209]    [c.1973]    [c.419]    [c.73]   
See chapters in:

Industrial ventilation design guidebook  -> Enclosures

Industrial ventilation design guidebook  -> Enclosures


Gas turbine engineering handbook (2002) -- [ c.147 ]

Surface production operations Ч.2 (1999) -- [ c.0 ]