Internal, generally

Smiths Detection DoE Oak Ridge National Lab Johns Hopkins University APL UTC Hamilton-Sundstrand IGEN International General Dynamics Becton-Dickinson... 

Developments to Date. It often has been stated that the basic policy objective of efforts to harmonize the U.S. and European laws is the achievement of consistent and effective protection of health and the environment. However, economic considerations — in particular, the avoidance (or minimization) of non-tariff trade barriers — constitute the principal force behind virtually all of these multilateral efforts. The trade in chemicals and chemical products constitutes a significant part of the overall trade between Western industrialized nations. Specifically, the U.S. enjoys a favorable balance in its chemicals trade, and this is particularly significant given the current recession. Thus, any unnecessary barriers to this trade may impose substantial burdens upon certain segments of the American chemical industry, and may constitute violations of the international General Agreement on Tariffs and Trade (GATT). 

In 1960 the International General Conference on Weights and Measures adopted an improved form of the metric system, The International System of Units (SI). The units of mass, length, and time are the kilogram (kg), meter (m), and second (s). The following prefixes are used for fractions and multiples ... 

The diameter and height of the contactor depend on the type of internals. Generally, bubble cap tray or structured packing is used as contactor internals. The following methods are used in the estimation of contactor diameter [3] The gas loading rate is estimated as... 

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