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1/4" black iron pigtail i.d. dimensions

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Hello, sorry for the oddball question. I have been looking around for the inner dimension of a 1/4" black iron pigtail and I cannot find it anywhere. Where I am we don't use steam for heating and we don't have one on hand that I could measure unfortunately. I would potentially like to use them for a Christmas gift if the dimensions work out. 
Thanks for your time.

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  • dko
    dko Member Posts: 644
    edited November 2023
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    Corrected by JC_Jones
  • Hvacdingus
    Hvacdingus Member Posts: 3
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    dko said:
    black iron pipe is measured by ID. so a 1/4" nipple/pigtail is 1/4" ID. but ID is reduced at the loop due to bending

    Sorry, I should have clarified what i.d. I was talking about.  
    I am talking about the i.d. of the loop itself. Not the pipe.

  • hot_rod
    hot_rod Member Posts: 22,483
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    About 1-5/8" on the steel 1-1/2" on the brass.
    Are you trying to slip it over a pipe?
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • ChrisJ
    ChrisJ Member Posts: 15,923
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    Hello, sorry for the oddball question. I have been looking around for the inner dimension of a 1/4" black iron pigtail and I cannot find it anywhere. Where I am we don't use steam for heating and we don't have one on hand that I could measure unfortunately. I would potentially like to use them for a Christmas gift if the dimensions work out. 
    Thanks for your time.

    McMaster has 2d drawings and 3d models of them.
    https://www.mcmaster.com/products/pigtails/gauge-siphon-tubes-6/material~steel-1/

    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
  • KC_Jones
    KC_Jones Member Posts: 5,750
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    dko said:

    black iron pipe is measured by ID. so a 1/4" nipple/pigtail is 1/4" ID.

    but ID is reduced at the loop due to bending

    That statement is incorrect, and even though it's not the OP's question I think it's important to have proper information presented.

    The consistency in piping is the OD, the ID varies by schedule and almost none of the pipe actually has an ID that is the same as it's nominal size. If you look at the chart in the below link you will see all the different pipe ID's, and OD's and with few exceptions none of them match the nominal pipe sizing.

    https://usaindustries.com/piping-isolation-testing-products/pipe-schedule-chart/
    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
    Boiler pictures updated 2/21/15
  • ChrisJ
    ChrisJ Member Posts: 15,923
    edited November 2023
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    From what I see on McMaster's model it's 0.364" ID on the straight seamless steel pigtail.
    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