Investigation of a technique for measuring the solids burden of gases described in BS 3405 has shown that 30% oversampling is possible.
In tests using BS pitot-static tubes (1) and BCURA cyclones (2) under conditions typical of plant practice the presence of solids in the gas stream had negligible effect on the pitot reading but increased the flow through the cyclone corresponding to any given pressure drop across it. The increase varied with solids concentration, particle size and the material used.
The mechanisms of the effect was not investigated but the observations suggest that it is caused by a small quantity of solids remaining airborne within the cyclone.
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References
1.
British Standard 3405, 1961 Revised 1971.
2.
“Measurement of Grit and Dust in Flue Gases”, HawksleyP.G.W.BadziochS.BlackettJ. H., BCURA1961.
Grit and Dust; “Measurement of Emission from Boiler and Furnace Chimneys; Standard Levels of Emission”. Min. of H. and L.G., Scottish Development Office, Welsh Office: HMSO 1967.
