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Missing Main Vent

mdmhh256
mdmhh256 Member Posts: 30
in Strictly Steam

1 pipe, gas steam system. 2 main loops with dry returns. one loop has a vent on the return just before it drops to the boiler (although I am not sure it is working). The other loop has no vent

IMG_0514.jpg

, but there is a capped T just below where the return drops to the boiler (see photo). Two questions…. (1) Is it ok to put a vent into that T ? (I presume replace cap with an elbow and run a several inch nipple up with the vent at the top?) (2) does it matter on the venting capacity of a main vent, or just go for the fastest one available. Thanks

Comments

  • delcrossv
    delcrossv Member Posts: 1,916
    edited February 14
    1. Yes, not ideal, but convenience counts. Come out full size and then use a reducing ell to your nipple going up. Go as high as possible.
    2. Vents should some relationship to main size. And since you have two, you'd want them to fill with steam at approximately the same time.

    Can you provide the size and approximate length of each main?

    Trying to squeeze the best out of a Weil-McLain JB-5 running a 1912 1 pipe system.
  • mdmhh256
    mdmhh256 Member Posts: 30

    will get back to you re: size/length. away for several days.

    delcrossv

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