TM 5-3895-374-10......................................................................................................................................................... EDIT PROCESS DELAYSActual interval measurement is usually done in two parts. First material is run from the furthest bin and the time for thismaterial to travel between bins is measured and recorded. The travel time from the furthest bin to the scale can also bemeasured and recorded. Next, the travel time of material from the scale to the point of asphalt injection is estimated. Thisinterval is hard to accurately measure as it is affected by materials, rates, burner air etc. Often it is easier to estimate thisnumber and correct it under actual operating conditions.For example:(in this example Bin 1 is the furthest bin) Actual materialtravel times are measured as follows:Bin 1 to Bin 2=3 seconds Bin 1 to Bin 3=4 seconds Bin 1 toVir Scale = 25 secondsAssume Vir Scale to A/C = 70 secondsThenVir Scale to A/C=70 sec.Bin 1 to A/C = Bin 1 to Scale + Scale to A/C=95 sec.Bin 2 to A/C = Bin 1 to A/C - Bin 1 to Bin 2=92 sec.Bin 3 to A/C = Bin1 to A/C - Bin 1 to Bin 3 = 91 sec.Enter these numbers in the computer. Now suppose on making actual mix some 5 seconds worth of material must berejected because it was not coated. This happens when material actually gets to the point of A/C injection beforeexpected. All time intervals should be shortened by 5 seconds because the A/C injection point is 5 seconds closer thanthought.The new values would then become:Vir Scale to A/C= 70 - 5= 65 sec. Bin 1 to A/C= 95 - 5= 90 sec.Bin 2 to A/C= 92 - 5= 87 sec. Bin 3 to A/C= 91 - 5= 86 sec.The rules are:On normal startup-if reject has too little oil shortenall intervals-if reject has too much oil lengthen allintervalsOn normal cleanout/shutdown-if reject has too much oil -shorten all intervals-if reject has too little oil lengthen allintervalsUsing the above rules the operator should be able to reach the point of having negligible waste at both startup andshutdown because of incorrect oil content.page F - 63SYSTEMS Equipment Corp. 8/31/89 Page (34)
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