Sterilizing jars? And related questions
9 years ago
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Conversion of 'All American - 25X sterilizer' to 'pressure canner
Comments (37)Ok, I had to chime in as I repair autoclaves for a living. With the RIGHT autoclave, sterility, safety, and flavor can be maximized. I have two Pelton Crane OCRs (10in diameter chamber,) one Midmark M9 (9in diameter chamber,) and one Tuttnauer 2540m (10in diameter chamber.) Of all the units I have used, the older Pelton Crane units seem to be the most viable for home canning, as I personally use them for this task. This autoclave uses a bellows to allow air in the chamber to be displaced by steam as the chamber heats up. It has a safety valve which will open in an over-pressure condition, usually at either 35 or 40 PSI. The analog temperature control is fully adjustable, regulated by a chamber steam temp sensor and TRIAC circuit. If you are worried about gauge accuracy, remember that there is a direct correlation between steam pressure and temperature. (See attached picture for a chart listing correlation points between temperature and pressure.) As long as the temp and pressure gauges correlate, it should be accurate. If you have doubts, a max register lag thermometer can be used to confirm the max temperature. If the max temp displayed on the thermometer matches what was shown on the gauge, and the temp and pressure gauges correlate, there is nothing to worry about. (If you are not running back to back cycles. More on this later.) When I am canning (or sterilizing liquid growth media or IV fluids) in it, I just run it at a lower temp for liquids, and only partially vent it at the end of the cycle to allow the water at the bottom of the chamber to exit. After the venting sound switches from water to steam bubbling through the condenser tube in the water reservoir, I allow the pressure to get down to about 5 PSI before closing the valve and allowing the unit to cool down naturally before opening the door. This will allow the pressure in the jars to come down some, and prevent exploding. This is mainly an issue if you are running cycles above 252F. For reference, pressure canning is usually done at 240F / 10.5 PSI, which is EASILY achievable in an autoclave. Lastly, when using an autoclave, you MUST remember to allow the unit to cool down enough for the bellows for it to open the chamber air vent valve. Failure to do this will cause air in the chamber to not be displaced by steam, leaving a space in the autoclave that DID NOT get up to temperature. -Adam Nash...See MoreQuestion about jarring
Comments (18)The great majority of home canners in the U.S. and Canada BWB jams and jellies. Most Europeans do not. It's not particularly a safety issue because you're dealing with a high-acid high-sugar product. However, shelf life can be reduced and there is a somewhat greater likelihood of mold. Jars with mold have to be discarded as a correlation between the mold and cancer has been found. It's your call. Not a big deal either way, though BWB is recommended by the USDA, Extension services, all standard sources (except for the pectin inserts, for some unknown reason). If you're referring to lemon juice in tomatoes, that is bottled lemon juice (i.e. ReaLemon) because the acidity is standardized. The alternative is powdered citric acid (which most feel has less effect on the flavor). It's commonly available in grocery stores/pharmacies or can be ordered online. Vinegar can also be used at 2x the amount of bottled lemon juice, but it does affect the flavor. I wouldn't use it for plain canned tomtoes. Rhubarb is much less acid than lemons and somewhat less acid than vinegar, so I don't see that as do-able. I hope this helps. Let us know if you have other questions. Carol...See MoreVintage Canning Jars/Lids Questions
Comments (6)The jars, if in good shape with no rim nicks or cracks of any kind can safely be used IF the 2 part lids will fit on them. Many of us use really old jars. Some of us use them only for BWB recipes rather than pressure canning but some will also use them in pressure canning as all you stand to lose is thejar of contents if they don't hold up to the pressure. The lids are another problem. The bail top jars and gaskets haven't been 'officially' approved for decades now because of the questionable quality of the seals. Like many of the other old time methods of canning they fall into the Equipment and Methods No Longer Recommended category. Only the 2 piece flats and bands are 'officially' approved. But some of us who have some of the old bail type jars do still use them for really high acid foods like pickles. Most just use them for dry storage items like dried beans and such. That type of use is approved. Personally I wouldn't trust them in pressure canning or with low acid or border-line acid foods. If you are just getting back into canning after several years it would pay to spend some time exploring the NCHFP website for all the latest guidelines and information. Start with the FAQs there. Dave...See Moresterilizing medium
Comments (7)Cavemangardener, I wonder if part of the problem with the peat/perlite or Vermiculite mixes at commercial stores is that it is not a money making product rather than an industry standard. It is very cost effective product at some of the large hardware stores, so commercial hydro stores probably can not compete with their low prices. An exception is the Perlite. The Perlite I have seen sold at chain hardware stores is not of high quality. The higher grades I have seen are at stores that cater to professional growers. Another consideration is a less expensive pump may oftentimes be used with a media system, which might affect sales of the higher priced pumps. The peat/perlite/vermiculite systems can take more work and can be messy to handle. They are, however, cheaper to set up to run, & the media can be recycled. They can require less powerful pumps, which is a money saver consideration during these higher fuel priced times. If I were selling commercially, I would want to sell more money making products, such as ready made systems or media with a higher markup. This is just my opinion....See More- 9 years ago
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