T.O. 33B-1-13-68c. Remove cap, cover, seal, or plug from the bulk vehicle container. Obtain a clean glass tube of sufficientlength to reach from the bottom of the bulk vehicle container to at least six (6) inches above thecontainer opening when tube is held in the vertical position.d. Place thumb over one end of the glass tube. Insert the other end of the glass tube slowly in a verticalposition into the bulk vehicle. Insure that the tube is all the way to the bottom of the container.e. Release thumb on upper end of the glass tube for five (5) to ten (10) seconds, then replace thumb overend of glass tube. Remove glass tube slowly from the bulk vehicle maintaining its vertical position.f. Prior to removing thumb from the end of the glass tube, observe the level of contamination in the glasstube. Water and other contaminants should be evident in lower portion of the glass tube, if present. (Atdepot facilities, if the vehicle is suspected, the contents of the glass tube may be sent to the depotchemical laboratory for analysis).g. If contaminants are evident in the bottom of the container, siphon off the good vehicle to within twoinches of contamination level.h. See paragraph 3.2.5.1.2 for disposition instructions of contaminated bulk vehicle.3.5.6.6.3 ParticleConcentration.NOTEPrior to adding the magnetic particles to the vehicle they SHALL be demagnetizedto eliminate any agglomeration that might have developed during storage because ofmagnetization.The strength of the bath is a major factor in determining the quality of the indications obtained. Too heavy aconcentration of particles gives a confusing background and excessive adherence of particles at external poles, reducingthe visibility of indications of very fine discontinuities. Add magnetic particles to obtain a suspension concentration asfollows:a. Visible magnetic particle bath concentrations: 1.2 to 2.4 milliliters (ml) of particles per 100 ml ofvehicle.b. Fluorescent magnetic particle bath concentrations: 0.1 to 0.4-ml/100 ml.These ranges are rather broad for uniform results and should be reduced by the individual laboratories for their specificrequirements. The optimum range for most magnetic particle bath concentrations is 1.5 to 2.0 ml/100 ml for visibleparticles and 0.15 to 0.20 ml/100 ml for fluorescent particles.3.5.6.6.4 DryPowderConcentrate.Measure out the required amount of powdered concentrate and pour it directly into the bath liquid in the tank. Theagitation system should be running and the concentrate poured in at the pump intake, so that it will be quickly drawninto the pump and dispersed. The new pre-wet concentrates will disperse very quickly even through the large volume ofbath in large units. After 10 minutes of operation the bath strength should be checked with a settling test. The amountof settled material should check approximately with the volume requirements in paragraph 3.5.6.6.3.3.5.6.6.5 PasteConcentrate.The procedure is similar to that followed with the dry powder concentrates, except that the paste must be weighedinstead of measured. It is transferred to a mixing cup or bowl, bath liquid is added little at a time, and mixed until asmooth thin slurry has been produced. This slurry is then poured into the tank at the point where the agitation system
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