Return to the Harvest Forum | Post a Follow-Up

Venting before pressure canning

Posted by junelynn 7NC (My Page) on
Sun, Jun 21, 09 at 12:38

Why does the UGA say that you need to let the steam run for 10 minutes?
"After 10 minutes of continuous steam, you can close the petcock or place the counterweight or weighted gauge over the vent port to begin pressurizing the canner. (See steps 3 and 4 below.)"

Is it to ensure the vent port is clear????
To ensure various areas in the canner have pressure (minimum)? To ensure the cans (jars) can take the pressure?

Thanks in advance...
June Lynn

Follow-Up Postings:

RE: Venting before pressure canning

While it has the added benefit of making sure the vent port is clean and clear, the primary reason it to make sure that all of the air is removed from the canner and that only steam remains.

If air remains trapped in the canner then both the pressure and temp are affected (reduced) even tho it won't register as such on the gauge. It is a food safety oriented rule. ;)


RE: Venting before pressure canning

Thank YOU!!

RE: Venting before pressure canning

That's right. You want to measure the steam pressure, not the air inside. Otherwise it will be underprocessed and your food will be unsafe.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Harvest Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here