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weil mclain reservoir piping

Thanks nbc - I've only used the search function to a very limited extent and since it referred me to very recent posts hadn't realized that older ones might be available.

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  • weil mclain reservoir piping

    anyone ever try some thing like this?
    the idea is to hold a bit of extra condesate in a "resevoir pipe" to tide the system over until it comes back.
    i only run low on water level occasionally when the burner cycles on my v-stat,probably because the steam bubbles collapse.
    i would like to keep the system gravity so my UPS will keep things going a long time when there is a power cut.[page 16]:


    http://www.weil-mclain.com/downloads/literature/eg/egboilermanual.pdf



    ..or maybe a surge collumn on the LWCO to make it a more true reading of level?
    nbc
  • gerry gill
    gerry gill Member Posts: 3,078
    gwgillplumbingandheating.com
    Serving Cleveland's eastern suburbs from Cleveland Heights down to Cuyahoga Falls.

  • reservoir piping

    thanks for the reply, that looks like my next project!
    are there any min. pipe sizes,or pitch requirements for the connection to the equaliser?
    w-m literature doesn't seem to recommend this arrangement on systems over 400,000 btu, whereas i have 1,050,000; but i don't see why it wouldn't work. i am probably only short a couple of gallons for 5 min. at the cut-out of the burner on pressure.
    probably i could use a left over non-bladder hydronic expansion tank on this. where would i get the nifty tank stand for it?
    i had thought of using an air compressor [controlled by the lwco pump contacts] to pressurize a tank below the waterline when needed and effectively raise the system waterline without really adding more water.but that could be a control problem.
    this looks better and more like what the "dead men" would have done if they ever used a boiler with low water content.any other experiences with rhis out there? thanks--nbc
  • gerry gill
    gerry gill Member Posts: 3,078
    we used a John Woods

    asme hydronic compression tank for that job which was also over a million btu..the Woods tank is nice cause it has the tapping on the top and the bottom..but any compression tank would work..just remember that you don't get as much water out of the tank as it may appear..if your operating level in the boiler is say 3'' then you only get the water in 3'' of the tank also..

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  • rich on heat
    rich on heat Member Posts: 47



    Thank you both for the information on the reservoir tank. It's interesting concept and seems like a great answer to early low water cut off problems.

    Gerry - Is there any downside to using a reservoir tank?
    Is there any possible problem with thermal shock on a cold start? I guess I'm concerned with the intake of a large volume of cold water into a hot boiler or is there enough mixing with the hot boiler water in bottom of the equalizer loop to prevent this?
  • gerry gill
    gerry gill Member Posts: 3,078
    there is no problem

    using a passive reservoir tank, and the water will be room temperature or warmer..so that isn't an issue either..its not really moving water very fast either..its an old timers method..

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  • reservoir piping

    i see from the w-h diagram that the disharge from the bottom of the tank bypasses the hartford loop, and goes straight into the boiler.
    it would be more convenient for me to pipe it into the wet return, or would that not work?
    any advice on pipe size or pitch on the top side? must it be 2 in. like the return, or could it be smaller?
    thanks--nbc
  • gerry gill
    gerry gill Member Posts: 3,078
    we used 1'' piping in and out of the tank.

    and the tank isn't part of the hartford loop but part of the wet return..probably 5 feet from the closest boiler..we took out one big boiler and put in three smaller boilers whose steam output equalled the radiation load but whose water content didn't equal the commercial boilers content..so we made up the missing 9 gallons with a reservoir tank..2'' of water in the tank is the 9 gallons..we don't believe in condensate tanks and feed pumps..we believe in gravity.

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  • gerry gill
    gerry gill Member Posts: 3,078
    maybe this picture

    will help more.. see the tank in the background against the wall?

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  • rich on heat
    rich on heat Member Posts: 47


    Gerry- Thanks for the info and pictures. I'm always completely awe struck with the quality and cherry layouts of your work !!!
  • Now that

    is some excellent piping.

    How much fuel did they save?

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  • gerry gill
    gerry gill Member Posts: 3,078
    won't know about fuel for awhile

    since we just finished the job..actually some loose ends to still tie up.

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  • JohnNY
    JohnNY Member Posts: 3,226
    An old post reference:

    I posted this a while back. I feel like we're saying and accomplishing the same thing with slightly different methods.

    Am I off the mark?

    Click here, please.


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  • rich on heat
    rich on heat Member Posts: 47


    Thanks John for posting your earlier discussion. Very interesting... I'm going to have to "absorb" the firing rate table. A shortcoming of this board is that there isn't an archive where you read old posts. Maybe they would take up too much web space I guess.
  • Dale
    Dale Member Posts: 1,317
    tank

    If you have a smaller system Burnham has a nice drawing in their heating helper book. The hookup drawing is complete. They use an 8 inch steel pipe. Length of pipe based on volume needed.If you had to pay someone to fit the cost of the pipe method might be more costly than the ASME steel tank, small ASME air compressor tank might be the least cost way to go.
  • archives R available

    don't forget you can do a keyword, or author search to read the old posts!
    the trick is the right key word!--nbc
  • reservoir tank for 1-pipe system

    just reviving this old post to ask some questions.
    do you think the tank needs to be vented to remove air in the steam cycle?
    i am about to put in a couple of hydronic expansion tanks piped in the way i think yours is. my feeling is that i don't need tank venting, just the column of air, from steam main, to tank waterline surface.
    i can always add the venting later. i'll try to post pix as soon as i get things finished.
    if this has no unintended consequences, then i can't under stand why more systems are not piped this way, unless it's because of needing such a large tank in relation to boiler size.after all, unlike pumps and tanks this one cannot overfill, unless gravity is reversed!--nbc
  • gerry gill
    gerry gill Member Posts: 3,078
    your correct

    no venting is required as its not necessarily steam thats needed to be pushing down on the tanks water but ''pressure'' thats needed..compressed air being pushed by the steam would work just as well.

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