Quote from: robertr on April 11, 2019, 12:57:36 PMI will add that the small desiccant drier on the Hill pump does not do much, the air does not stay in the desiccant long enough to do it's job properly . It is best to make an external desiccant tube to feed the small one on the pump. It should be long enough that the air stays in the tube for a bit before it gets to your pump. The one I made is 28" high x 1 1/2" ID pvc pipe.I found an old thread on the GTA where Ribbonstone mentioned he tested how fast a Hill pump desiccant "filled up"--it only took a few fill sessions. (Here's the link he gave to the test https://www.tapatalk.com/groups/yellow/dry-pac-testing-t155379.html#p1457268)Have you been able to estimate how long your PVC pipe version lasts before recharging is needed? What desiccant did you fill it with?
I will add that the small desiccant drier on the Hill pump does not do much, the air does not stay in the desiccant long enough to do it's job properly . It is best to make an external desiccant tube to feed the small one on the pump. It should be long enough that the air stays in the tube for a bit before it gets to your pump. The one I made is 28" high x 1 1/2" ID pvc pipe.
Cobalt is an essential element for life in minute amounts. The LD50 value for soluble cobalt salts has been estimated to be between 150 and 500 mg/kg.[114] In the US, the Occupational Safety and Health Administration (OSHA) has designated a permissible exposure limit (PEL) in the workplace as a time-weighted average (TWA) of 0.1 mg/m3. The National Institute for Occupational Safety and Health (NIOSH) has set a recommended exposure limit (REL) of 0.05 mg/m3, time-weighted average. The IDLH (immediately dangerous to life and health) value is 20 mg/m3.[115]However, chronic cobalt ingestion has caused serious health problems at doses far less than the lethal dose. In 1966, the addition of cobalt compounds to stabilize beer foam in Canada led to a peculiar form of toxin-induced cardiomyopathy, which came to be known as beer drinker's cardiomyopathy.[116][117]It causes respiratory problems when inhaled.[118] It also causes skin problems when touched; after nickel and chromium, cobalt is a major cause of contact dermatitis.[119] These risks are faced by cobalt miners.Cobalt can be effectively absorbed by charred pigs' bones; however, this process is inhibited by copper and zinc, which have greater affinities to bone char.[120]