I wrote a column about this some years back. The unnamed author mentions the point of no pressure change and the location of the compression tank. This is the only issue (1930) of that book that mentions this, which remains a mystery (I had just about all the editions in my collection). Gil Carlson gets credit for it, but clearly he wasn’t the first to know about it.
I asked him one day how he came upon the PONPC. He said it was just something he had always known. Gil was seven years old in 1930. I suspect he may have seen the 1930 edition when he was an engineering student at Purdue.
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1930 was the year, hydronic design and products
hot_rod
Member Posts: 25,045
Found a copy of this engineers guide that talks about pumping away from the point of no pressure change.
Other clever products and design graphs. It's hard not to like a "compeller"
Also a chapter on gravity hydronic design and pipe sizing
Enter the graph on the lower left quadrant, follow the dotted line across and up through the other quadrants.
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream
trainer for Caleffi NA
Living the hydronic dream
6
Comments
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Those ASHVE Guides are great. I have that year's Guide, as well as about 20 others.
All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Consulting1 -
do you have the 1929?
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
Yup.
All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Consulting0 -
I like the description of the second to last screenshot. "For stimulating the circulation in hot water heating systems…" differentiating from gravity type heating. And reading things in their infancy.
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First non-electric radiator valves and circulators. The compeller and the thermotrol.
We have come a long way in the last 94 years.
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I wrote a column about this some years back. The unnamed author mentions the point of no pressure change and the location of the compression tank. This is the only issue (1930) of that book that mentions this, which remains a mystery (I had just about all the editions in my collection). Gil Carlson gets credit for it, but clearly he wasn’t the first to know about it.
I asked him one day how he came upon the PONPC. He said it was just something he had always known. Gil was seven years old in 1930. I suspect he may have seen the 1930 edition when he was an engineering student at Purdue.
Retired and loving it.2 -
At the end of the chapter that talks about the PONPC they reference professor F.E. Giesecke ASHVE June and August 1929. Is he the gentleman that came up with the concept?
Perhaps more to be learned in those issue??
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream
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I don’t recall which magazine published that article that I wrote about this. However, there was no response from anyone in the industry or otherwise.
Retired and loving it.0 -
I don't remember the magazine version of the story, or what year.
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
Yes. I don’t remember either. I wrote too much. 🤪
Retired and loving it.1 -
Well, here is some info on Dr. Giesecke:
Use the Find function on this one to see the titles of his articles:
and this one too:
and:
etc etc.
All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Consulting0 -
Very interesting. It is amazing how much has changed. Thank you for sharing.
In my mind I am trying to imagine what it took to build a large say four thousand square foot home from scratch in 1930. From the foundation to the four inch gravity mains to the "thermostatic" valves on the radiators.
Then I fast forward to today. Modern construction methods, pex tubing, and thermostatic valves on the heat emitters.
I would guess that today the labor (in hours) is about one third of what it was in 1930 for the same house. So much has changed.
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Dr. Giesecke's bio is here:
And here is another one that mentions Dr. Giesecke, in league with a bunch of other Dead Men @DanHolohan has introduced us to over the years:
All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Consulting0 -
This would be an interesting read if you have the issue?
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
i have many questions about the humidifier
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@DanHolohan I believe I remember. It was in Plumbing and Mechanical Magazine.
I remember because I saved it and read it to a Voc. Ed. class I was teaching at the time.
If memory serves me correctly, the title of the article was "The Point of No Pressure Change". In the article, you wrote about why manufacturers shipped boilers with the circulator mounted on the return and why this was wrong. ( I think, because of this article, it was the beginning as to why they stopped shipping them that way.) It was around the time of the war in Kuwait. You mentioned something about scud missiles in the article.
I may have the full magazine somewhere. If I find it I'll post it.
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Thanks! HR posted it above.
Retired and loving it.0 -
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Look like something similar to the Walton humidifier that was introduced about the same time.. I have 2 portable Waltons that are still in service.
Trying to squeeze the best out of a Weil-McLain JB-5 running a 1912 1 pipe system.0
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