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Trial Number 0

Trial Purpose:

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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