Well done, Bill. Love your videos!
This is just food for thought as to what the oil could be....
The oil in your video looks similar to that in the photo on page nine of this Propane Education and Research Council
Final Report on An Assessment of the Merit of Conditioning LP Gas Hoses.
That page also says:
"It is interesting to note that after each static test was complete, and the LP Gas had been flared, an oily, golden-yellow liquid (shown in Figure 7) was recovered from the hose. The amount of liquid varied from test to test, from less than a teaspoonful to several tablespoonfuls for a 2-foot hose."
and
"By analogy, for a 125 ft hose typically used on a bobtail, the amount of residue would be in the cupfuls! An analysis of the liquid showed that it consisted mainly of plasticizers and heavy hydrocarbons. It is also interesting to speculate what happens to such liquids in the LP Gas distribution system."
(a bobtail is the delivery truck which delivers the propane to your supplier)
(My comment- Upon first seeing the idea that it's from plasticizers, I thought that unlikely given the short length of the rubber hose in our campers' propane system. But I was surprised to see how much came from a 2-foot hose in their testing. And they also make the point that it could be passed along through the supply chain.)
Also--
On page 29 of this "
Good Practices for the Care and Custody of Propane in the Supply Chain" report, we see:
"Oil Residues and Heavy Hydrocarbons
Description: This type of potential contamination can vary from very light oil to a very viscous tar-like substance. Sometimes it is a waxy material like paraffin, or it may be similar in consistency to axel grease. Sometimes it is transparent (no apparent color) while at other times it is light brown, dark brown, or even black. It usually has a strong odorant smell, as the ethyl mercaptan used as an odorant in propane appears to concentrate in the oily residues.
Source: The oils in propane can come from many sources; from processing, pipelines, pumps or compressors, piping systems, and flexible hoses. Heavy-ends usually appear when the liquid propane is vaporized for end-use applications. When external heat is used to vaporize propane, like in a propane powered vehicle vaporizer or industrial water-bath vaporizer, heavy-ends tend to deposit in greater volume."
and
"Prevention:
The following steps may prevent or reduce the occurrence of oily residues and heavy-ends in propane:
• Investigate and develop processes and procedures to help identify and eliminate the sources of oil.
• Use filters in the propane liquid or vapor lines (such as a coalescing filter) to remove oil prior to the end-use equipment.
• Use inspection and remediation procedures to ensure that empty storage tanks and piping are free of oils and heavy-end contaminants before being filled with liquid propane.
• Use oil traps to collect and remove any oils downstream of all externally heated vaporizers"
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That info appears to support the idea that the oil comes from 'a bad fill', i.e, inadequate quality control in the supply chain.
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