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Which Hoffman 17C cage unit vents faster: Tunstall or B&J?

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Waterbury Steam
Waterbury Steam Member Posts: 53
in Strictly Steam
Just curious--I'm working on fine tuning my system and have had some luck with replacing a few stock Hoffman 17C capsules with B&J units, based on the data in Gerry Gill's balancing book. That book doesn't include any data on the equivalent Tunstall replacement cage--anyone know which is faster or if they're about the same?

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  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,576
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    I would think the capacity is dependent on the size of the orifice under the new capsule, and with either make, it would be the same.--NBC
  • Waterbury Steam
    Waterbury Steam Member Posts: 53
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    Maybe I should just order one of the Tunstalls and give it a try. I know the B&J is a lot faster than the stock Hoffman.
  • Silkey
    Silkey Member Posts: 18
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    I am replacing what looks to be original 1/2" steam traps with new Hoffman 17c traps. (Thats what the repair man used when one leaked last winter). The originals have an S inside a circle with a wishbone or v underneath.
    My question is if I should install new Bar and Jones Cage units when installing the new traps. I have not yet bothered to calculate many things...how much air in the main line, size of radiators....

    2 story house, 1600sq ft, about 22' x 36' each floor, 8 radiators, 2 main lines: 1 is about half the length of the other.

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