US 7,320,760 B2
Cleaning efficiency testing method and apparatus for a filter in a filtering system
Stefan Hedström, Helsingborg (Sweden); Harald Hermansson, Lund (Sweden); and Jeanette Lindau, Södra Sandby (Sweden)
Assigned to Tetra Laval Holdings & Finance S.A., Pully (Switzerland)
Appl. No. 10/496,672
PCT Filed Nov. 26, 2002, PCT No. PCT/SE02/02162
§ 371(c)(1), (2), (4) Date May 26, 2004,
PCT Pub. No. WO03/045530, PCT Pub. Date Jun. 05, 2003.
Claims priority of application No. 0104020 (SE), filed on Nov. 30, 2001.
Prior Publication US 2005/0000894 A1, Jan. 06, 2005
Int. Cl. B01D 41/00 (2006.01)
U.S. Cl. 210—741  [210/791; 210/108; 210/143; 73/38; 73/40] 14 Claims
OG exemplary drawing
 
1. A method for testing the efficiency of a cleaning procedure for a filter in a filtering system, said filter being provided with pores, comprising the steps of:
performing said cleaning procedure for said filter,
wetting said filter,
pressurizing the filtering system,
measuring a pressure decay in said filtering system over a predetermined time period, and
determining, based on the pressure decay, whether or not the cleaning procedure has been effective, wherein a pressure decay smaller than a predetermined threshold value indicates that the cleaning procedure has not been effective.