In the preceding blog we looked at the expansion and contraction of liquids as a means of measuring temperature. The expansion and contraction of solids (usually metals) is another way to measure temperature. Most solids expand and contract in a relatively linear way in response to temperature changes. In most cases, solids expand as they …
In preceding blogs I have identified temperature as probably the single most important variable in a cleaning process. Devices that sense and control temperature, therefore, are a critical part of a cleaning system. Let’s take a quick look at a few of the types of temperature sensors that are available and suggest where each is applicable …
I have talked before on the blog about the subject of chemical concentration and its relationship to cleaning. A couple of recent incidents prompt me to re-address the subject of chemical concentration but from a little different angle. It’s a “no-brainer” that cleaning chemicals are expensive and, with the possible exception of heat and labor, …
In some cases, previously described oil removal technologies based on the gravity separation of oil from the cleaning solution are unjustifiably cumbersome and expensive. Fortunately, smaller scale solutions are available for use in such applications. Oil Skimmers – Oil skimmers utilize a material which preferentially attracts oil (hydrophobic) to skim floating oil from a surface …
Preceding blogs have described oil removal techniques for industrial cleaning in some detail. It would be nice if this was always a simple consideration – but it is not! The case for using an oil coalescer is pretty clear cut as long as the cleaning chemistry is truly a “splitter” AND, THE OIL IS NOT WATER SOLUBLE. …
In the blogs Chemistry – Oil Splitting and Oil Emulsification – Part 1 and Chemistry – Oil Splitting and Oil Emulsification – Part 2, I discussed how oils are removed from parts using chemistry that either splits or emulsifies the oil. The next step is to collect and get rid of or recycle that removed oil. This …
As I have said before on this blog, I am not a chemist. Whatever I say about chemistry on the blog is expressed in layman’s terms and is based on practical experience and not on any deep understanding I have of the properties of chemicals. The usefulness of any information provided here applies only to …
A few more things to monitor – Dirty rinse – An effective rinse is critical to most cleaning processes. Only in very limited cases can residues from the cleaning step be left on parts after they are cleaned. It does not, of course, do any good to clean the parts if they become re-contaminated by a …
Here are a few more variables that can be monitored in cleaning systems in pursuit of a Six Sigma process – Oil laden detergent – A good oil removal system is paramount in controlling the quality of the detergent in a cleaning system. An oily bath can quickly become ineffective in removing additional oil and even …
As discussed earlier, monitoring variables in a process is a critical part of Six Sigma. The following are some examples of parameters that can be monitored in a cleaning process and some suggestions regarding how the monitoring can be done. Chemical Concentration – Chemistry (detergent, acid, rinse aid, etc.) is one of the most important components of the …
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