Best Practice

The surest test for chirality is a careful examination of mirror image forms for superimposabihty Working with models provides the best practice m dealing with mol ecules as three dimensional objects and is strongly recommended... 

PEGULATORYAGENCIES - CHEMICALPROCESS INDUSTRY] (Vol21) Best practicable control technology ppCp... 

Diffusion Theory. The diffusion theory of adhesion is mosdy appHed to polymers. It assumes mutual solubiUty of the adherend and adhesive to form a tme iaterphase. The solubiUty parameter, the square root of the cohesive eaergy deasity of a material, provides a measure of the iatermolecular iateractioas occurring within the material. ThermodyaamicaHy, solutioas of two materials are most likely to occur whea the solubiUty parameter of oae material is equal to that of the other. Thus, the observatioa that "like dissolves like." Ia other words, the adhesioa betweea two polymeric materials, oae an adherend, the other an adhesive, is maximized when the solubiUty parameters of the two are matched ie, the best practical adhesion is obtained when there is mutual solubiUty between adhesive and adherend. The diffusion theory is not appHcable to substantially dissimilar materials, such as polymers on metals, and is normally not appHcable to adhesion between substantially dissimilar polymers. 

R. Hart, Best Practice Centrifugal Pumps. NPSH Definitions and Specifications, Du Pont Internal Specification, Wilmington, Del., May 18,1992. 

The effluent standards require two levels of treatment best practicable control technology (BPCT) and best available control technology (BACT). New standards covering additional industries are stiU being issued. Of special concern to the chemical industry are the following Hsted categories ... 

Best Pra.ctices, Technology leaders must provide the direction for improving work processes as well as the work itself. They should seek the best known ways to carry out R D best practices. There is considerable advice available on best R D practices. 

The energy needed to melt steel is much less than that required to reduce iron oxide to a molten product. The latter can be well over 2000 kWh/1 for the chemical reaction alone. To melt steel from room temperature takes about 390 kWh/1. By using some preheat from waste gases, actual electrical usages in best practice can be <390 kWh/t, an advance from 450—500 kWh/1 needed in the 1980s and still characteristic of many furnaces. 

Precautions. Care should be taken not to impair the quaUty of the metal as a result of the melting operation. The best practice is to select scrap of known good quaUty. The use of miscellaneous scrap may not be economical, despite the lower cost of such material however, it is not common practice to make much use of virgin metals. 

The performance of a controller (and its tuning) must be based on what is achievable for a given process. The concept of best practical IE (lEb) for a step change in load Aq can be estimated (Shinskey, Feedback Controllers foi the Process Industries, McGraw-Hill, New York, 1994) ... 

Limitations based upon application of the best practicable control technology currently available (BPT) apply to existing point-sources and should have been achieved by July 1, 1977. Limitations based upon application of the BATEA (Best Available Technology Economically Achievable) that will result in reasonable further progress toward elimination of discharges had to be achieved by July 1, 1984. 

Ignition Sources Normally it is best practice not to base explosion safety solely on the presumed absence of an ignition source. Explosion control should be based on prevention or protection techniques, or both. Even so, all reasonable measures should be taken to eliminate ignition sources. 

Investigations of incidents associated with tolling projects have identified that appropriate selection of a toller based upon proper equipment and expertise is important in reducing the likelihood of future process safety related incidents and environmental releases. It is likewise important to review toller safety, health, and environmental practices (current and past) in the selection process. This review can identify those practices that would need to be modified to be acceptable. Eliminating less qualified candidate firms at an early stage is a best practice. 

Some variants of best practicable means are spelled out in the U.S. Clean Air Act of 1977. One is the requirement that best available control technology (BACT) for a specific pollutant be employed on new "major sources" that are to be located in an area that has attained the National Ambient Air Quality Standard (NAAQS) for that pollutant. BACT is also required for pollutants for which there is no NAAQS [e.g., total reduced sulfur (TRS), for which emission limits are specified by a Federal New Source Performance Standard (NSPS)]. BACT must be at least as stringent as NSPS but is determined on a case-by-case basis. 

If plant expansion is being studied with the idea of determining the best practical upper limit, the linear program can be a great help. Each incremental expansion step can be evaluated and payouts determined off line. Also, each piece of proposed new equipment can be evaluated as to its effect on the entire plant. 

BEST PRACTICABLE ENVIRONMENTAL OPTION (bpeo) Organizations may be eneouraged to undertake systematie deeision proeesses with a view to seeking the BPEO that provides the most benefit (or least damage) to the environment, at an aeeeptable eost. 

BPM 1 Best practicable means general principles and practice... 

World Bank. 1993. "Agricultural Pest Management." Guidelines and Best Practice, GB 4.03. World Bank Operational Manual. April, Washington. 

From your discussions about the previous series of questions, are there any best practices that you think might be recommended as possible low-cost/no-cost P2 actions If so, develop a list of actions needed to verify their benefits, and how you intend to implement them. 

The safety alert concept is another tool that can be used by large or small businesses to communicate past best practices and indicate a path forward. On a daily basis, lessons learned should be communicated in a site safety meeting. A worker or supervisor may have discovered that a current practice could cause a potentially dangerous situation. Many times the correction or long-term fix for a hazard involves engineering... 

Means, best The best practical means for preventing the escape of noxions or offensive gases, smoke, grit, and dust from a process into the atmosphere. (U.K. Alkali Regulations.)... 

An inventory management system should be established - meaning set up on a permanent basis to meet defined inventory policies and objectives approved by executive management. It should be documented - meaning that there should be a description of the system, how it works, the assignment of responsibilities, the codification of best practice, procedures, and instructions. The system should be planned, organized, and controlled in order that it achieves its purpose. A person should therefore be appointed with responsibility for the inventory management system and the responsibilities of those who work the system should be defined and documented. Records should be created and maintained that show how order quantities have been calculated in order that the calculations can be verified and repeated if necessary with new data. The records should also provide adequate data for continual improvement initiatives to be effective. 

A technique for measuring an organization s products, services, and operations against those of its competitors, resulting in a search for best practice that will lead to superior performance. 

Note that the lamina failure criterion was not mentioned explicitly in the discussion of Figure 4-36. The entire procedure for strength analysis is independent of the actual lamina failure criterion, but the results of the procedure, the maximum loads and deformations, do depend on the specific lamina failure criterion. Also, the load-deformation behavior is piecewise linear because of the restriction to linear elastic behavior of each lamina. The laminate behavior would be piecewise nonlinear if the laminae behaved in a nonlinear elastic manner. At any rate, the overall behavior of the laminate is nonlinear if one or more laminae fail prior to gross failure of the laminate. In Section 2.9, the Tsai-Hill lamina failure criterion was determined to be the best practical representation of failure... 

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