Accession Number : ADA298261

Title :   Investigation of Stack Gas Filtering Requirements and Development of Suitable Filters.

Descriptive Note : Rept. no. 8,

Corporate Author : LITTLE (ARTHUR D) INC CAMBRIDGE MA

PDF Url : ADA298261

Report Date : 28 FEB 1950

Pagination or Media Count : 36

Abstract : Currently a paper filter design has been developed, and performance characteristics have been determined. Facilities have been set up for producing full size filters in pilot scale production. Samples of these filters have been provided to the various AEC sites for operating tests and for general evaluation. Manufacturing methods are being worked out with the intention that the filters in a variety of sizes will be produced by a commercial manufacturer. It should be understood that this kind of filter comes closer to being an absolute filter than any other type of air cleaning device now produced commercially. It is regularly observed that less than .02% of dust in the size range of 0.2 to l.0 micron is passed by these filters when new. Filtration very rapidly improves still further with use and the improved efficiency remains up to the point where the dust load becomes so excessive that the units must be replaced. The primary dust load in an atomic energy installation is the dirt naturally found in the atmosphere Therefore the tests have been carried on with particular emphasis on performance against atmospheric air borne dust. The high speed jet impactor was adopted as the test instrument and has proven itself satisfactory. Filter media other than the especially developed paper have been studied - particularly glass fiber mats, and their performance characteristics have been observed. Increase of pressure drop was moderate, indicating good life expectancy for air filters at that site using such media. No special filtration problems were encountered It has been demonstrated that a low efficiency filter medium can be improved greatly for air filtration by priming with a finely divided asbestos fiber.

Descriptors :   *AIR FILTERS, PRESSURE GRADIENTS, REQUIREMENTS, FIBERS, MANUFACTURING, PRODUCTION, LIFE EXPECTANCY(SERVICE LIFE), EXPOSURE(GENERAL), HIGH TEMPERATURE, EFFICIENCY, TEST EQUIPMENT, DUST, INSTALLATION, GLASS FIBERS, COMMERCIAL EQUIPMENT, NUCLEAR REACTORS, CLEANING, ASBESTOS, PAPER, PILOT PLANTS, FILTRATION, FLUE GASES, MATS, CORROSIVE GASES, MILLIPORE FILTERS.

Subject Categories : Pumps, Filters, Pipes, Tubing, Fittings & Vlvs

Distribution Statement : APPROVED FOR PUBLIC RELEASE