Tetracyclines" in ECT 1st ed., Vol. 13, pp. 771—810, by P. Regna, Chas. Pfizer Co., Inc., C. H. Demos and L. M. Preuss, Ledede Laboratories, American Cyanamid Company in ECT 2nd ed., Vol. 20, pp. 1—33, by R. K. Blackwood, Chas. Pfizer Co., Inc. in ECT 3rd ed., Vol. 3, pp. 64—78, by J. H. Boothe and J. J. Hlavka (Ledede Laboratories, a division of the American Cyanamid Company).  [c.182]

J. H. Boothe and co-workers, / A.m. Chem. Soc. 75, 4621 (1953).  [c.182]

M. J. MarteU, Jr. and J. H. Boothe,/ Med. Chem. 10, 44 (1967) G. S. Redin in G. L. Hobby, ed., MntimicrobialMgents and Chemotherapy., WiUiams Wilkins, Baltimore, Md., 1966, p. 371.  [c.183]

J. J. Hlavka, P. Bitha, and]. H. Boothe,/. Am. Chem. Soc. 87, 1795 (1965) 90, 1034 (1968).  [c.183]

P. Bitha, J. J. Hlavka, andJ. H. Boothe,/. Med. Chem. 13, 89 (1970).  [c.183]

M. J. MarteU, Jr., A. S. Ross, andj. H. Boothe,/ Med. Chem. 10, 485 (1967).  [c.183]

J. H. Boothe and co-workers,/Chem. Soc. 80, 1654 (1958).  [c.183]

J. H. Boothe and co-workers,/Chem. Soc. 82, 1253 (1960).  [c.183]

M. J. MarteU, Jr., A. S. Ross, andj. H. Boothe,/ Med. Chem. 10, 359 (1967).  [c.183]

M. MarteU, A. Ross, andj. Boothe,/ Am. Chem. Soc. 89, 6780 (1967).  [c.183]

Compared to other coating methods, powder technology offers a number of significant advantages. These coatings are essentially 100% nonvolatile, ie, no solvents or other pollutants are given off during appHcation or curing. They are ready to use, ie, no thinning or dilution is required. Additionally, they are easily appHed by unskilled operators and automatic systems because they do not mn, drip, or sag as do Hquid coatings. The reject rate is low, the finish tougher and more abrasion resistant, than that of most conventional paints (see Paint). Thicker films provide electrical insulation, corrosion protection, and other functional properties. Powder coatings cover sharp edges for better corrosion protection. The coatings material is weU utilized overspray can be coUected and reappHed. No solvent storage, solvent dry off oven, or mixing room are required. Air from spray booths is filtered and returned to the room rather than exhausted to the outside. Moreover, less air from the baking oven is exhausted to the outside thus saving energy. Finally, there is no disposal problem because there is no sludge from the spray booth wash system. Whereas the terms coating powder and powder coating are sometimes used interchangeably, herein the term coating powder refers to the coating material and powder coating to the process and the appHed film.  [c.317]

The characteristic of the electrostatic spray process to form limiting films enables operation of equipment after only brief training and instmction. It is almost impossible to create mns, drips, or sags characteristic of spray-apphed Hquid finishes. Furthermore, the practical design of automatic spray installations is possible. Multiple electrostatic guns mounted on reciprocators are positioned in opposition to each other in an enclosed spray booth and parts to be coated are moved between the two banks of guns where a uniform coating of powder is apphed. Oversprayed powder is captured in the reclaim system and reused. Powder coating booths have been designed with interchangeable filter units to facihtate change from one powder type of color to another (64). A typical automatic powder spray installation having replaceable cartridge filters for color changes is shown in Figure 5. One disadvantage of the electrostatic powder spray process using corona discharge guns is that a high voltage field is set up between the gun and the parts to be coated. Parts having deep angles or recesses are sometimes difficult to coat because of the Faraday Cage effect (65).  [c.324]

Further, in the coating operation almost all powder is recovered and reused, resulting in higher material utilization, and waste minimization. The air used in the coating booths during appHcation is filtered and returned to the workplace atmosphere, reducing heating and cooling demands. Additionally because of the need for more sophisticated devices to control emission of VOCs in Hquid systems, the capital investment to install a new powder coating line is becoming increasingly more economically favorable. The savings in material and energy costs of powder systems has been documented in several studies (84,85).  [c.326]

In powder coating installations, the design of the spray booth and duct work, if any, should be such that the powder concentration in the duct is always kept below the LEL employing a wide margin of safety. General safety considerations are detailed (90). The use of flame detection systems in all automatic powder coating installations is required. Most spray booths being installed, such as that illustrated in Eigure 5, do not utilize baghouses or cyclones for dust collection and, therefore, because no enclosed or confined space for a dust cloud is present, pose Htde hazard for a dust explosion. If powder ignition should occur, flame detection sensors shut down the power to the coating system with the exception of overhead lights.  [c.326]

Where product is exposed at transitions or packing operations use containment devices such as gloveboxes provide airflow control (laminar flow booths) or as a last resort use the room as containment and provide suitable personal protective equipment for the operators  [c.99]

Open-fronted extraetion booths for spraying operations, or adhesive applieation operations.  [c.107]

Released at low velocity into moderately still air Spray booths Intermittent container filling Low-speed conveyor transfers Welding Plating Pickling 0.51-1.02  [c.408]

Active generation into zone of rapid air motion Spray painting in shallow booths Barrel filling Conveyor loading Crushers 1.02-2.54  [c.408]

Spraying and the design of spray booths  [c.584]

Has the employer implemented the use of engineering controls (e.g., pressurized cabs or control booths, remotely operated material handling equipment) and work practices (e.g., removing all nonessential personnel during drum opening, wetting down dusty operations, working upwind of possible inhalation hazards) to reduce and maintain employee exposure to or below permissible exposure limits to the extent feasible [OSHA Reference. 120(g)(l)(i)]  [c.262]

Does the employer implement the use of engineering eontrols (e.g., pressurized eabs or eontrol booths, remotely operated material handling equipment) and work praetiees (e.g., removing all nonessential personnel during drum opening, wetting down dusty operations, working upwind of possible inhalation hazards) to reduee and maintain employee exposure to or below permissible exposure limits to the extent feasible [OSHA Referenee. 120(g)(l)(i)]  [c.263]

Specitic hoods Basic openings, nm exhausts, [.VHV, Booths, laboratory fume  [c.817]

At many workplaces, emissions occur randomly across a certain emission area (e.g., across the area of a workbench or grinding workpiece). In many cases these emissions are difficult to control using exterior exhaust systems because of the undefined emission location and because of work procedure flexibility. Additionally, severe influences (cross-flows) from the surrounding room often reduce the efficiency of single exhaust elements to a minimum. In such cases, booths are the appropriate choice for a local exhaust system.  [c.881]

Booths are generally suitable for all sources where the location of the emission can not be restricted to a fixed point (e.g., area sources) or moving point sources (e.g., polishing, grinding, welding, spray painting) and for sources with high momentum-driven emissions (e.g., grinding, spray painting .  [c.882]

Workbench type Booths of this type have at least one open face and thus may be laboratory fume cupboards, safety cabinets, or similar equipment.  [c.883]

Special-purpose type Booths of this type are specially designed, in shape and function, for a certain production facility and/or process.  [c.883]

In addition to the location of the capture systems, booths could be assigned to different design categories  [c.883]

Booths are also available that recirculate the exhaust air, after internal filtering, to the surrounding room or other areas outside the room.  [c.883]

There are other small closed volumes where it is necessary to supply a limited flow rate, but where the air sometimes has to be treated carefully through filtering, gas cleaning, heating, cooling, etc. Some examples are the air supply inside a car and airplane and train cabins. These systems are seen mostly as general ventilation systems. Ventilation of control cabins in industry such as crane driver s cabins, with specific demands on heating, cooling, and cleaning, is usually named local ventilation and consists of a supply system only. The air could be treated and distributed through a system in the cabin or from a central system, connected in a way similar to how some mobile local exhaust hoods are connected to a fan (see Section 10.1.2). These cabins have similar functions as cabins used for control purposes, such as traffic toll booths, pay booths, money exchange booths, ticket booths, etc. These have some differences with general ventilation systems regarding choice of opening size of air supply, air velocities, airflow rates, air quality, and temperature. Mostly the demands are similar to demands on general ventilation systems, the difference being that these small volumes have no exhaust system and let the air out of the volume through small openings in the walls. In this way they also to some e.xtent use pressurization of the volume to limit the entrance of contaminants.  [c.918]

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]

J. J. Hlavka and J. H. Boothe, eds.. The Tetragclines, Spriuger-Vedag, New York, 1985, Chapt. 1.  [c.477]

J. J. Hlavka andj. H. Boothe, eds.. Handbook ofExpenmenta/Pharmaco/ogy, Vol. 78, Springer-Vedag, New York, 1985, p. 86.  [c.183]

The health hazards and risk associated with the use of powder coatings must also be considered (see Hazard analysis and riskassessment). Practical methods to reduce employee exposure to powder such as the use of long-sleeved shirts to prevent skin contact should be observed. Furthermore, exposure can be minimized by good maintenance procedures to monitor and confirm that the spray booths and dust collection systems are operating as designed. Ovens should also be properly vented so that any volatiles released during curing, such as caprolactam in the case of urethane polyesters, do not enter the workplace atmosphere. Whereas the vast majority of powder coatings do not give off any volatiles during the cure, in addition to caprolactam, small amounts of methanol are released during the cure of powders using melamine derivatives and, in some cases, low molecular-weight polymers, oligimers, or additives may become volatilized during the curing operation.  [c.326]

Purified by Soxhlet extraction with CHCI3. The CHCI3 is evaporated and the residue is recrystd from EtOAc and/or sublimed at 120 /4mm. It has an acidic pKa of 4.5 in H2O. [IR Boothe et al. J Am Chem Soc 75 1732 1953 DePuy and Zaweski J Am Chem Soc 81 4920 1959.]  [c.182]

A booth should be of suffieient size to eontain any naturally oeeuii ing emissions and so minimize eseape via the open faee. An air veloeity of 0.56 m/s is required over the whole open faee a higher veloeity is needed if there is signifieant air movement within the booth or to eope with eonveetion eurrents. Booths should be deep enough to eontain eddies at the rear eorners baffle plates or multiple offtakes may be neeessary with shallow booths.  [c.407]

Davis, G.D., Cooke, A.V., Rooney, M., Groff, G.B, Boothe, R, Simmons, C., Sw auger T.R. and Graham, P, In Proc. 1995 JANNAF Propulsion and Subcoinmillee Joint Meetings Technology. Chemical Propulsion Information Agency, Columbia, MD, 1995.  [c.1007]

Building areas separated by physical walls (e.g., halls, rooms, booths) located on the same level. The wall has either intentional apertures or leaks (Fig. 7.107c2).  [c.591]

In practice, piston flow is not very easy to establish. A common way, utilized in cleaiiroonis and paint booths, is to have a filter mat placed all across  [c.645]

The specific problems for BEOs are mostly related to the specific processes at which they are used. One problem that does not, directly, depend on the process is the use of the exhaust system. If an exhaust is not used, naturally it cannot remove contaminants. Although BEOs are less efficient than total or partial booths, their use is still justified. When the location of the BEO is not perfect, higher flow rates are usually required for contaminant control. However, it is better to use this type of hood than to have no local exhaust.  [c.831]

Released at Imv velocity into rnodcTarciv srill air Spray booths, intermittent container filling, low-speed conveyor transfer, welding, plating, pickimg 0,5- l. 0  [c.847]

Active generattem into /.one of rapid iir morion Spray painting in shallow booths, barrel filling, conveyor loading, crushers 1.0-2.5  [c.847]

Partial enclosures are a compromise between containment and access. Most people misunderstand the function of partial enclosures. It is not possible to completely separate the interior from the surroundings with partial enclosures. Complete separation is only possible with total enclosures. The function of a partial enclosure is as dependent on the flow rate, the flow field, the working procedures, the contaminant generation process, etc. as is the function of exterior hoods. The advantage with a partial enclosure is that the physical walls diminish the possibilities for the contaminants to escape from the hood to the surroundings. Thus these hoods could be used when relatively high demands are put on the contaminant concentration outside the hood. Some of the most commonly used enclosures, such as fume cupboards and booths, are described. Many variations of these exist, e.g., enclosure of the complete process, and some of these are described here.  [c.878]

Booths are partially enclosed workplaces with one or more open facefs) for access by workers. These openings at one or more sides of the enclosure function not only to capture air contaminants directly through their short-distance capture capability but also to cause an airflow in a certain direction (normally away from the worker/work process and into the enclosure). The capture efficiency could be increased by using an existing main flow direction (e.g., thermal flows caused by heat sources) to support the capture process.  [c.881]

Booths are often used for work prtKedures with momentum-driven emissions. In such cases the capture devices must be placed to rake advantage of this momentum. For example, a spray paint booth would have the exhaust location downstream of the painting location, most likely at the back of the booth. The capture devices in the back wall should be suitable to reduce the momenriim of the emitted particles in such a way that they are not reflected back into the work area. Floor exhaust should be able to keep the heavier particles dowm so that they cannot be a source for secondary emissions.  [c.882]

Based on the manufacturing process, the existing emission processes, and on workers demands (e.g., ergonomical aspects), different types of booths are possible. Many of these are commonly used. There can be a division according to the booth type (the shape of the booth), the position of the worker, the type of emission process, and the applied types of capture devices with the corresponding airflow pattern inside the booth.  [c.882]

Floor type or cahhv. The floors of these booths are at or very near to the facility flo >r level. They are often very large to accommodate very large workpieces. In some cases, these booths may have flexible or hydraulically movable walls or roof to ensure access to the booth bv a crane (see Fig, 10.41.  [c.882]

See pages that mention the term Booths : [c.190]    [c.379]    [c.183]    [c.119]    [c.881]   
Industrial ventilation design guidebook (2001) -- [ c.878 , c.881 , c.882 , c.883 ]