湿磁粉悬浮液浓度Concentration of wet magnetic particle suspensions.docVIP

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湿磁粉悬浮液浓度Concentration of wet magnetic particle suspensions.doc

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Concentration of wet magnetic particle suspensions NDE07-08 Revision 0 Date 30/04/2017 Page PAGE 4 of NUMPAGES 4 Concentration of wet magnetic particle suspensions 3 2 1 0 REVISION PREPARED BY REVIEWED BY APPROVED BY AI 1. Scope This procedure covers the measure of wet magnetic particle suspension and provides a means of evaluating the wet magnetic particle testing for discontinuity. This procedure is prepared reference to T765 WET MAGNETIC SUSPENSION AND POLLUTION” of ASME Sect.Ⅴ. 2. Concentration of wet magnetic particle suspensions 2.1 The initial bath concentration of suspended magnetic particles should be as specified of as recommended by the manufacturer and should be checked by settling volume measurements and maintained at the specified concentration on a daily basis. If the concentration is not maintained properly, test results can vary greatly. 2.2 The bath concentration shall be maintained within 1.2 to 2.4 ml per 100ml of vehicle for no fluorescent particles unless otherwise specified by the particle manufacturer. 2.3 Bath concentration is normally determined by measuring its setting volume through the use of an ASTM Pear-shaped centrifuge tube with a 1.5-ml stem(0.1-ml divisions )for nonfluorescent suspensions .Before sampling, run the suspension through the recirculation system for at least 30-min to assure thorough mixing of all particles which could have settled on the sump screen and along the sides or bottom of the tank. Take a 100-mL portion of the suspension from the hose or nozzle and allow it to settle for approximately 30 min. The volume settling out at the bottom of the tube is indicative of the particle concentration in the bath. If the bath concentration is low in particle content, add a sufficient amount of particle materials to obtain the desired concentration. If the suspension is high in particle content, add sufficient vehicle to obtain the desired concentration. 2.4 If the settled particles appear to be loose agglomerates