Method for measuring the local hydraulic permeability of a sub-group of hollow fibre of a bundle of hollow fibres
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United States of America Patent
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Jul 31, 2007
Grant Date -
Nov 25, 2004
app pub date -
Jun 24, 2004
filing date -
Oct 30, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method is provided for measuring the local hydraulic permeability, Lpi, of a sub-group of hollow fibres of a bundle of hollow fibres mounted in a tubular casing. The method comprises a step of placing the casing containing the bundle in a vertical position, the lateral opening of the casing being disposed toward the bottom, and sealing the lower end of the casing. A graduated, calibrated tube is applied in a vertical position over a portion of the upper cut surface of the bundle to form a sealed connection there between. A liquid is passed through the lateral opening of the casing at a defined flow rate, and the time required for the liquid to pass from a first graduation to a second graduation of the tube is measured. Lpi can then be calculated from the formula Lpi=V/tPSi in which; V represents the volume of the tube between the two graduations; t represents the time that the liquid takes to pass from the first graduation to the second graduation of the tube; P represents the transmembrane pressure; and Si represents the surface area of the hollow fibres belonging to the sub-group under consideration for the measurement.
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