Testing how the positions of tubes effect cleaning
Date Run:
05/16/1995
Experiment Procedure:
Testing the how the positions of the tubes will effect the cleaning inside the tubes. Two cleaners will be used, 10% Skyproducts Cleaner #10 and 4% ManGill #0650. For Each Cleaner, three positions will be used. First the tubes will be filled with cleaner and pointed hole side up. Second, the tubes will be filled with cleaner and lie on their side. Finally, the tubes will be filled with cleaner and pointed hole side down. Samples were cleaned using Crest Ultrasonics in a beaker for 15 minutes at 140 degrees. For all three testing conditions the tubes were filled with cleaner or water before washing and rinsing. The samples were rinsed in a beaker filled with tap water at 140 degrees and agitated with a stirbar. During rinsing the tubes were positioned hole side up so that the oil was allowed to escape. After rinsing the water was drained out of the tubes and they were placed in a convection oven set at 162 degrees for one hour and then placed in a vacuum oven set at for 1 hour. All samples were weighed before cleaning and after drying. The amount of residual oil on the inside of the tubes was checked by inserting a cotton swab in the hole and noticing the oil buildup on it. The amount of oil buildup will be termed: none, slight, moderate, heavy.
Trial Results:
GRAVIMENTRIC ANALYSIS
sample # and tube positioning
amount of oil inside tubes (swab)
weight with contamination(g)
weight after cleaning (g)
weight change (g)
49, upward
none
15.5557
15.5474
0.0083
50, upward
slight
15.5749
15.5621
0.0128
51, upward
slight
15.589
15.5616
0.0274
52, upward
none
15.5391
15.5261
0.0130
53, upward
heavy
15.6068
15.5875
0.0193
54, upward
slight
15.5993
15.5917
0.0076
55, upward
slight
15.5775
15.5629
0.0146
56, upward
moderate
15.5349
15.5084
0.0265
57, sideways
light
15.5567
15.5436
0.0131
58, sideways
moderate
15.637
15.6264
0.0106
59, sideways
none
15.6652
15.6527
0.0125
60, sideways
slight
15.5549
15.5319
0.0230
61, sideways
moderate
15.5600
15.5523
0.0077
62, sideways
slight
15.6249
15.6082
0.0167
63, sideways
moderate
15.6576
15.6504
0.0072
64, sideways
heavy
15.6700
15.6602
0.0098
65, downward
none
15.6240
15.6129
0.0111
66 downward
moderate
15.6230
15.6204
0.0026
67, downward
none
15.5223
15.5005
0.0218
68, downward
heavy
15.6682
15.6283
0.0399
69, downward
moderate
15.6268
15.6101
0.0167
70, downward
slight
15.6653
15.6494
0.0159
71, downward
heavy
15.6077
15.5739
0.0338
72, downward
none
15.5691
15.5604
0.0087
Notes and Observations: Hole side up-Oil was released from the hole of the tube immediately after insertion into the ultrasonic bath. Tubes filled up easily in the cleaner but needed some aggitation to fill the tubes totally up with rinse water. Average removal was .0162 grams with a standard deviation of .0075.
Hole side down-No noticable removal of oil during cleaning. But after draining the tubes after cleaning and rinsing, alot of oil was released. Average removal was .0188 grams with a standard deviation of .0126. Sideways-Due to cloudiness of cleaner solution could not see if any oil was being released. Tubes needed to be shaken up in order to allow cleaner solution to fill the tubes. Alot of oil was released from the tubes during draining. Average removal was .0126 grams with a standard deviation of .0052.
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Copper tubes looked very clean after drying. Some residual copper buildup was noticed on the bottom of the beaker of Skyproducts cleaner solution after cleaning. This is believed to be copper chips that were on the tubes prior to cleaning. The swab tests show that the Skyproducts #10 cleaner was superior to the Mangil Gillite 0650. The best oil removal was obtained when the tubes were placed upright. Better removal can be obtained with a longer cleaning time and better rinsing (most likely tumbling).
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