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Adding a low pressure gauge

cubicacrescubicacres Member Posts: 256
We saw a 0-3 psi gauge we thought we'd try adding to our 0-30 psi gauge required by the city on our steam boiler to see how the pressure's going. Would a 0-5 or 0-10 psi gauge be better in case psi were to jump over 3 on occassion? We're not expeting that since we have our pressuretroll set for as low as it goes around 1-1.5 psi (I think) and things have been fine, but wondering how much over 3 psi a 0-3 gauge might handle before causing it trouble.

Comments

  • Jamie HallJamie Hall Member Posts: 6,598
    Depends on the gauge. Usually, however, you can find the maximum rated pressure somewhere in the fine print.
    Jamie



    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.



    Hoffman Equipped System (all original except boiler), Weil-McClain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • JUGHNEJUGHNE Member Posts: 3,067
    Some will add the 0-3 PSI gauge next to the 30 PSI on a tee, but install a ball valve under the low pressure one, leave it off until you want to read it. This protects it from high pressure which you may notice on the 30# one if there is a problem.

    A second pressure control as a high limit is not a bad idea also.
  • cubicacrescubicacres Member Posts: 256
    Thanks-we have 2 pressuretrolls on one pigtail, I think. We could add a pigtail with the 0-3 or 0-5psi gauge addition. Any thoughts on pipe configuration with them (2 pressuretrolls, one 0-30 psi & one 0-3 gauge)?

    The manufacturer of the gauge said there's not much tolerence over 3 psi (2-3% above 3psi) or 5 psi for each of the respective gauges, so with pressuretrolls set at .5 cut in with a differential of 1 or 1.5, is a 2 psi ceiling enough of a safety margin to go with the 0-3 psi gauge, or would 0-5 or 0-10psi be a safer choice (but with less detail on the psi scale as a tradeoff)?
  • ChrisJChrisJ Member Posts: 8,477
    edited August 9
    I aim for 50% of the gauge.

    Meaning, if you run 1.5 PSI, a 3 PSI gauge is good. If you run 2 to 2.5 PSI, go with a 5 PSI gauge.

    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment

    Steam system pictures
    https://goo.gl/photos/ZgpNUTyckkmiEdAf9
    Central air project pictures
    https://goo.gl/photos/4JjnLStEq42sWsQo8
  • cubicacrescubicacres Member Posts: 256
    We'd like to try as low as possible, so maybe a 0-3 is best for us.
  • ChrisJChrisJ Member Posts: 8,477
    > @cubicacres said:
    > We'd like to try as low as possible, so maybe a 0-3 is best for us.

    As low as possible? :)
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment

    Steam system pictures
    https://goo.gl/photos/ZgpNUTyckkmiEdAf9
    Central air project pictures
    https://goo.gl/photos/4JjnLStEq42sWsQo8
  • SteamheadSteamhead Member Posts: 11,271
    Go with the 0-3, and definitely add a second pigtail for the second pressuretrol. On a boiler like your W-M EGH, you'd come out from the side of the boiler with a 1/2" or 3/4" nipple and put your pigtails on a cross or a pair of tees. Unfortunately I don't have any pics of where we've done this on that type of boiler.

    I like to install my gauges on 1/4" tees under the pressuretrols, with suitable extension nipples as needed. This way you can check to see that the pigtails are not plugged without disconnecting and removing the pressuretrols- by removing the gauges and blowing into the pigtails.
    All Steamed Up, Inc.
    "Reducing our country's energy consumption, one system at a time"
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Baltimore, MD (USA) and consulting anywhere.
    https://heatinghelp.com/find-a-contractor/detail/all-steamed-up-inc
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