WRT to the other, moisture penetrating CU and thermo plastic lines? No, not buying that. If so we'd see a whole lot of weeping plumbing in houses. And even if they did weep, I'd still have a hard time believing that MS can pull a moisture gradient/vacuum to do it much less make any difference to ACR copper or HP thermoplastic with a 7000psi burst rating.
We have an expression that the 'eyes can't see what the brain doesn't know' which I think applies here.
We are dealing with water vapor (gaseous) in the ppm level not free water leaking through cement wall. Buy it or not if you fill a copper pipe with dry pressurized air at - 60 C atmospheric dew point and then come back six months later there will be an increase in measured water vapor in that pipe. The same goes for thermoplastic except that the water vapor molecules will penetrate even faster if the air in the line is sitting.
Usually this is academic of course unless you are a hospital which is trying to meet a water vapor specification in the compressed air and the copper piping has not been purged for many months. The same goes for a fire hall that wonders why they have failed on the moisture spec when all their piping rather than being stainless steel is thermoplastic. These issues are real and well documented by people who actually work with these problems on a day to day basis.
Please do us a favor and search on here for Iain's guidelines for MS storage wrt moisture penetration. If I recall a plastic ziplock bag is several days, a thick plastic jug is three months, and a steel paint can is 12 months. You can put your 10% humidity disc in each one and see how long the 10% RH sector remains blue. There is a reason LF has an shelf life for its cartridges even if vacuum sealed and unopened.
Trace Analytics did tell me to do a 20 min run before I sampled, but that was to make sure the compressor what completely heated up, and pumping properly - ie ring seal vs oil contamination, and to heat up any fill lines greater than 10' left "wide open" to ambient to purge them.
I don't buy the oil logic wrt a RIX which has no oil, but I can understand a need to warm up the entire system - compressor filters, etal and have it pressurized under load before filling or sampling. Everything works better when its warm, me included.
That said, empirical data trumps theory any day of the week, and if it all works better after the first 20 mins, then that's when I'll fill.
WRT 13x, from what I can read, it only regenerates at temp 200-350 degC, not wrt pressure (?). So (trying to understand this) why do you say it will dump its Co2 (or H2O) if at ambient?
At pressure more water molecules can be stored in the MS bed and the same goes for volatiles on the AC bed. If you have been running a cartridge for many months and keeping it pressurized but suddenly it loses that pressure the CO2 and VOCs will be released back into the air stream and contaminate your breathing air.
On a smaller scale this will happen with every compressor run if your system leaks back to ambient overnight such that the CO2 retained by the sieve at 3000 psig will no longer be retained and instead will re-enter the air stream. That is why Trace and all the other labs tell you to purge your system for twenty minutes before sampling. Same goes for moisture if the thermoplastic hoses are long and have been sitting for weeks.
If you look in any of the smaller Bauer compressor manuals (where the compressor does leak down to ambient pressure) they all tell the end user to purge the fill lines for several minutes to ambient before filling tanks so as to not end up with this CO2 slug in the first tank.
From the Trace web site:
"The filter will then hold the CO
2 along with other removed impurities.
If a sudden pressure drop should occur, like when the bleed valve to the purification chamber is opened too quickly or a sudden failure of the pressure maintaining valve occurs, then CO2 and other contaminants can be released into the air stream. Another scenario that can cause high CO
2 levels is when a purification filter is not removed but moved up the chain of cartridges to a front position or when it has reached its maximum efficiency. Some filters have a moisture indicator strip on the outside of the cartridge. Even though the strip may not indicate that it is time to be removed, it should not be assumed that the filter is good as new. A filter is like a sponge, it can hold on to unknown quantities of CO
2 or gaseous hydrocarbons. When it becomes completely saturated, like a sponge, it will not continue to remove but allow contaminants to simply pass through. If a pressure drop occurs at this point, large amounts of CO
2 and/or gaseous hydrocarbons can be released."
Compressed Air Testing - Carbon Dioxide - Trace Analytics, The AirCheck? Lab