Presto Pressure canner VS All American. - Page 4

rhines81 · August 17, 2015

Yes frdlturner - just hook them up in tandem and assume that when his gauge is 16 psig (worst case), that your gauge is pointing to its 15 psig point (could actually be pointing at 13psig) and mark the location of your needle with a sharpie. Test it 3-5 times (for repeatability) before you make the final mark.
Always test on the high side of the accuracy band, otherwise you are aiming for under-pressure.
The more accurate the test gauge, the better. The accuracy stated is almost always based on the full scale of the gauge. A 3% gauge 0-30psig is just as accurate as a 1.5% gauge o-60 psig - theoretically.

It would even be better if his gauge was calibrated to a standard that indicates his gauge reading when the actual pressure is 15 psig, but we can't all be that lucky.

Worth1 · August 17, 2015

Another thing I have now discovered is the gauges on the two canners.
The All American has a lid that is thick enough to use a gauge that connects with a 1/8 inch standard national pipe thread.
evidently the Presto since 1978 the lid is thinner and it requires a nutted gauge with a rubber gasket and washer.
Prior to January 1978 they used a a NPT threaded gauge.
Thinner metal would be the only reason I could see for the change but I may be wrong.

It also seems to me that if the weights are as accurate as they claim to be then a person would never have to have the dial gauge tested on that canner.
The weights never change and aren't mechanical.
In other words if it reads zero and spans without sticking and the steam is released on the 10 pound weight and the gauge reads 10 pounds then it is okay.
You would check it with the 5 and 15 pound weights also.
If I am not mistaking there are three weights each representing three pounds with the presto you can buy.
If it is so, then you would start at 5 and work your way up adding a weight after each test.
You couldn't do this with the All American as it would require you to remove the weight and release steam each rotation of the weight.
You would have to let it cool off first each time.
Does this make sense?

Why am I even saying this because you can have them tested for free here in the US.
Not everyone is in the US and that is why I am posting this.
It would be a way to test your gauge if you have no other way.
It would also be a good way to see how accurate that cheap gauge is on the canner.

Worth

Worth1 · August 17, 2015

I would also bet the All American has a much better gauge.

I need to correct my self it seems the presto still uses NPT but they have a contration to screw it into so far i have seen 3 different gauge setups.

Remember on a gauge or NPT threads 1/8 pipe threads will look like 1/4 inch the reason is pipe is measured on the inside not the outside like a bolt.

Worth

frdlturner · August 17, 2015

Thanks rhines81 and Worth
My friend says he is going to give me the gauge if I can use it to test with its in a box set in foam.

Worth1 · August 18, 2015

Here I submit to you the new OSHA/USDA/UL/FM Listed approved safety canner.
You will see it has three gauges three regulator weights a pressure switch going to the power shut off for gas and electricity.
Another wire going to an air raid siren outside to warn the neighborhood of impending doom.
The pressure vessel is rated for 500 psi and weighs 200 pounds even though everything is set to either shut off and sound the siren at 25 PSI.
The three (if all else fails) plugs will blow out at 30 PSI.
Due to be on the market in 2025.
One of the gauges will be a test gauge.
The other two shall be of industrial grade.
It will also have an alarm that goes off as long as the canner is under pressure.
Cost $5,000 not including installation by an approved technician.
Happy safe canning.

Worth

Canner1.jpg

loulac · August 18, 2015

Is it made of aluminium, stainless steel or titanium ? maybe pure gold to be sent to Emirates ?

Nematode · August 18, 2015

Whoa there that things not safe yet by a long shot

The pressure detecting thumbscrews, so it can not be opened with any steam pressure,
The safety heat shield so you cant touch the outside and get a burn.
The broken back safety stickers warning not to lift it.
And because there is not an actual canner spec it will require an ASME rating under the catch all pressure vessel spec.

Can you tell I've dealt with them?

Worth1 · August 18, 2015

Quote:

Originally Posted by Nematode

You forgot
The pressure detecting thumbscrews, so it can not be opened with any steam pressure,
The safety heat shield so you cant touch the outside and get a burn.
The broken back safety stickers warning not to lift it.
And because there is not an actual canner spec it will require an ASME rating under the catch all pressure vessel spec.

Can you tell I've dealt with them?

That's why it wont be out till 2025 it is a prototype.
Meanwhile thousands and thousands of people will get burned.

Keep the ideas coming we'll make this thing fool proof for sure.

Worth

TomNJ · August 18, 2015

Quote:

Originally Posted by Worth1

Here I submit to you the new OSHA/USDA/UL/FM Listed approved safety canner.
You will see it has three gauges three regulator weights a pressure switch going to the power shut off for gas and electricity.
Another wire going to an air raid siren outside to warn the neighborhood of impending doom.
The pressure vessel is rated for 500 psi and weighs 200 pounds even though everything is set to either shut off and sound the siren at 25 PSI.
The three (if all else fails) plugs will blow out at 30 PSI.
Due to be on the market in 2025.
One of the gauges will be a test gauge.
The other two shall be of industrial grade.
It will also have an alarm that goes off as long as the canner is under pressure.
Cost $5,000 not including installation by an approved technician.
Happy safe canning.

Worth

Beautifully done Worth!!!

TomNJ/VA

TomNJ · August 18, 2015

I measured the height of my AA 30 quart canner and it is 18 3/4 inches in total height.

Tom

**coronabarb** · August 18, 2015

Worth, it has to have a fancy paint job with flames like Alton Brown's KitchenAid mixer.

Worth1 · August 18, 2015

Quote:

Originally Posted by TomNJ

I measured the height of my AA 30 quart canner and it is 18 3/4 inches in total height.

Tom

Thank you Tom.

I knew you would come through.

Worth

Worth1 · August 18, 2015

Quote:

Originally Posted by coronabarb

Worth, it has to have a fancy paint job with flames like Alton Brown's KitchenAid mixer.

Don't tempt me.

I have a grey/silver looking KtichenAid food processor I need to paint red so it will match my red KtichenAid mixer.

Worth

**coronabarb** · August 18, 2015

I have a red one too but I'd rather have one like this...

Worth1 · August 18, 2015

I like this one.
Worth

August 17, 2015	#46
rhines81 Tomatovillian™ Join Date: Mar 2015 Location: Zone 5A, Poconos Posts: 959	Yes frdlturner - just hook them up in tandem and assume that when his gauge is 16 psig (worst case), that your gauge is pointing to its 15 psig point (could actually be pointing at 13psig) and mark the location of your needle with a sharpie. Test it 3-5 times (for repeatability) before you make the final mark. Always test on the high side of the accuracy band, otherwise you are aiming for under-pressure. The more accurate the test gauge, the better. The accuracy stated is almost always based on the full scale of the gauge. A 3% gauge 0-30psig is just as accurate as a 1.5% gauge o-60 psig - theoretically. It would even be better if his gauge was calibrated to a standard that indicates his gauge reading when the actual pressure is 15 psig, but we can't all be that lucky. Last edited by rhines81; August 17, 2015 at 10:09 PM.

August 17, 2015	#48
Worth1 Tomatovillian™ Join Date: Feb 2006 Location: Den of Drunken Fools Posts: 38,539	I would also bet the All American has a much better gauge. I need to correct my self it seems the presto still uses NPT but they have a contration to screw it into so far i have seen 3 different gauge setups. Remember on a gauge or NPT threads 1/8 pipe threads will look like 1/4 inch the reason is pipe is measured on the inside not the outside like a bolt. Worth Last edited by Worth1; August 17, 2015 at 10:28 PM.

August 18, 2015	#50
Worth1 Tomatovillian™ Join Date: Feb 2006 Location: Den of Drunken Fools Posts: 38,539	Here I submit to you the new OSHA/USDA/UL/FM Listed approved safety canner. You will see it has three gauges three regulator weights a pressure switch going to the power shut off for gas and electricity. Another wire going to an air raid siren outside to warn the neighborhood of impending doom. The pressure vessel is rated for 500 psi and weighs 200 pounds even though everything is set to either shut off and sound the siren at 25 PSI. The three (if all else fails) plugs will blow out at 30 PSI. Due to be on the market in 2025. One of the gauges will be a test gauge. The other two shall be of industrial grade. It will also have an alarm that goes off as long as the canner is under pressure. Cost $5,000 not including installation by an approved technician. Happy safe canning. Worth Canner1.jpg Last edited by Worth1; August 18, 2015 at 01:32 PM.

August 18, 2015	#52
Nematode Tomatovillian™ Join Date: May 2012 Location: massachusetts Posts: 1,710	Whoa there that things not safe yet by a long shot The pressure detecting thumbscrews, so it can not be opened with any steam pressure, The safety heat shield so you cant touch the outside and get a burn. The broken back safety stickers warning not to lift it. And because there is not an actual canner spec it will require an ASME rating under the catch all pressure vessel spec. Can you tell I've dealt with them? Last edited by Nematode; August 18, 2015 at 07:39 PM. Reason: Humor.attempt

August 18, 2015	#56
coronabarb Tomatoville® Recipe Keeper Join Date: Jan 2006 Location: Roseburg, Oregon - zone 7 Posts: 2,821	Worth, it has to have a fancy paint job with flames like Alton Brown's KitchenAid mixer. __________________ Corona~Barb Now an Oregon gal

August 17, 2015	#49
frdlturner Tomatovillian™ Join Date: Mar 2011 Location: Galena, MO Posts: 215	Thanks rhines81 and Worth My friend says he is going to give me the gauge if I can use it to test with its in a box set in foam.

August 18, 2015	#51
loulac Tomatovillian™ Join Date: Feb 2013 Location: France Posts: 554	Is it made of aluminium, stainless steel or titanium ? maybe pure gold to be sent to Emirates ?

August 18, 2015	#55
TomNJ Tomatovillian™ Join Date: May 2009 Location: Floyd VA Posts: 771	I measured the height of my AA 30 quart canner and it is 18 3/4 inches in total height. Tom