Work-life

An important aspect of this procedure is the use of latent acid catalysts, such as phenyl hydrogen maleate, phenyl trifluoracetate, and butadiene sulfone. These catalysts reduce the peak exotherm from over 200°C to 130—160°C. The resin catalyst mixture has a working life of up to several days at RT. The elevated temperature of mol ding these latent catalysts generates the corresponding acids, namely, maleic, trifluoracetic, and phenolsulfonic, which cataly2e the resole reaction. Typically, a cycle time of 1—2 min is requited for a mold temperature of - 150° C. 

Ambient-cure systems are often based on lower molecular-weight soHd epoxy resins cured with aUphatic polyamines or polyamides. Curing normally occurs at ambient temperatures with a working life (pot life) of 8—24 h, depending on the formulation. Epoxy—poly amine systems are typically used for maintenance coatings in oil refineries, petrochemical plants, and in many marine appHcations. Such coverings are appHed by spray or bmsh. These are used widely where water immersion is encountered, particularly in marine appHcations (see COATINGS, MARINE). 

Example 1 Capitalized Cost of Equipment Apiece of equipment has been installed at a cost of 100,000 and is expected to have a working life of 10 years with a scrap value of 20,000. Let us calculate the capitalized cost of the equipment based on an annual compound-interest rate of 5 percent. 

With this equation the life of the bearing can be determined for different load conditions and is predetermined for the type of drive and service requirements. To select a proper bearing, therefore, the type of application and the loading ratio (CIP) should be carefully selected to ensure the required minimum life. Bearing manufacturers product catalogues provide the working life of bearings for different load factors and may be referred to for data on C, C and other parameters. 

Since the contacts make tind break in vticuum there is no oxidtition of the contticts. The contacts thus do not deteriorate and provide a longer working life. 

The choice of the metal (Section 22.4) for the grounding electrode will depend upon the corrosion factor of the soil. Btit all metals are equally good and possess a life span of 12 years and more. For a longer working life, the thickness of the electrode may be increased as discussed in Section 22.4.1. Gl being a more... 

This test is conducted to estimate the working life of a capacitor. Brietly. the test can be conducted in three stages as follows ... 

Time period beginning once the resin is catalyzed and terminating when material is no longer workable working life. 

Figure 9-1 is an example of what a modern level A ensemble ean look like. Remember, level A suits are fully eneapsulated. The ensemble would eome with gloves and boots ineluded. An overboot and overgloves would be added to provide extra proteetion and add extra working life to the ensemble. An SCBA is worn with the air paek unit fully within the ensemble, and the worker wears a full faeepieee. Notiee the field of vision that the worker enjoys with the ensemble shown. Were the ensemble in Figure 9-1 not fully eneapsulated at the sleeves, feet, or seams, it would not be eonsidered level A. 

National Institute for Working Life, Umed, Sweden... 

Pckkinen, ]. Eloranta, M. Hyvarinen, J. Muttilainen, and E. Kahkonen. In Ventilation 94 Proceedings of the 4th International Symposium on Ventilation for Contaminant Control, Stockholm, Sept. 5-9 1994 (eds. A. Jansson and L. Olander). (Arbete och Hdlsa no. IS), Sweden National Institute for Working Life, 1994, pp. 276-280. 

Fan, general-purpose A fan used to handle air that will not affect its working life, i.e., with no special requirements for temperature, moisture, or corrosive, abrasive, or flammable properties. 

Long-term exposure limit (LTEL) An exposure limit requirement based on the assumption that the total body intake of a pollutant below this limit over an 8-hour working day will have no harmful effect on the worker over a working life. See also Maximum exposure limit (MEL), Occupational exposure limit (OEL), and Short-term exposure limit (STEL). 

Michael Robinson (10) Division of Mathematics, School of Science and Mathematics, Sheffield Hallam University, FIK Gunnar Rosen (10, 12) Department of Work Organisation Research, National Institute for Working Life, Solna S 171 84, Sweden Sakari Sainio (16) Espoo-Vantaa Institute of Technology, Espoo, Finland Esa Sandberg (8) Satakunta Polytechnic, Pori FIN-28600, Finland... 

Battery types are either lead-acid or nickel-cadmium cells. Lead-acid types have been used for a long time and, when correctly maintained, have a working life of 25 years. Nickel-cadmium batteries offer the same working life as lead-acid but are smaller in weight and volume, generally with a higher initial capital cost. Loads applied to D.C. systems can be categorized into three types ... 

It should be noted that these are in terms of short-or long-term exposure levels and are based on an average working week s exposure and an average working life. They do not directly relate to exposure outside the workplace. 

The efficiency of all mechanical seals is dependent upon the condition of the sealing area surfaces. The surfaces remain in contact with each other for the effective working life of the seal and are friction-bearing surfaces. 

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