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Ok Boiler Guys, What's This Fitting?????
I'm trying to diagnose a hot water boiler that's having poor water circulation. I found this 1 1/4 fitting that's connected to the supply line and coupled with two dialectic unions. I think it's some kind of strainer but I just want to make sure before I drain the system down and take it apart. Thanks 
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It looks like it is a possible expansion joint. Can you look at it from the end ? You will see the bellows under the cover.
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Originally Posted by
chander
It looks like it is a possible expansion joint. Can you look at it from the end ? You will see the bellows under the cover.
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Hmmmm. Well the fitting doesn't have any way to expand or contract. It's just a solid can with a union on each side. I was wondering maybe if it was some kind of magnet design to trap and debris in the pipework.
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If it is solid, I don't have a answer for you.
This is what I though it was. I have used these for expansion. Metraflex_Expansion_Joints.pdf
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Originally Posted by
Chopchop
Expansion joint
Can you elaborate. The fitting doesn't slide or move in any way.
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Originally Posted by
James Colver
Can you elaborate. The fitting doesn't slide or move in any way.
I did a little checking and this is what it appears to be.
https://www.hyspan.com/series8500.html
Far better it is to dare mighty things, to win glorious triumphs even though checkered by failure, than to rank with those poor spirits who neither enjoy nor suffer much because they live in the gray twilight that knows neither victory nor defeat. (President Theodore Roosevelt)
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I don't know but it looks suspicious like one of those magnetic 'ion / molecule / particle alignment' devices that were popular for a time. <g> And maybe still are - although I haven't seen one for a good while.
PHM
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Originally Posted by
James Colver
PHM
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When faced with the choice between changing one's mind, and proving that there is no need to do so, most tend to get busy on the proof.
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Originally Posted by
retired btc
Looks like BTC called it. Thanks man
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Definitely an expansion joint
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Expansion joint. We have the same thing in the schools
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Expansion joint. Depending on the model that plug would be the packing cylinder. We have 6 expansion joints to replace this summer on a university steam system. Ranging from 4” to 18”.
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Originally Posted by
HvAckid82
Expansion joint. Depending on the model that plug would be the packing cylinder. We have 6 expansion joints to replace this summer on a university steam system. Ranging from 4” to 18”.
what do you mean by the packing cylinder? it's on the non steam side of the expansion joint, but within the cylinder?
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They have that for water/hydronic systems. Picture a pipe and another slightly smaller pipe within the larger pipe. The smaller pipe/slip can move but needs to be sealed. There are different methods of seals/guides such as graphite and you can pump “grease” special product to help seal the graphite or other type. The slip/smaller pipe needs to be kept clean so the debris does not damage the internal guides. No one ever cleans them.
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Ahhh, interesting, thank you, have never dealt with one.
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