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systems_glitch

Schrader Valve on Telephone Conduit?

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I've noticed what appears to be Schrader (tire) valves on a number of telephone system conduits in our area. I finally remembered to take the camera with me and grab a picture:

 

post-2713-0-88618300-1378226841_thumb.jp

 

Any idea what this is for?!

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Sometimes phone lines were compressed either with dry air or nitrogen to keep the copper wires on long trunk lines from oxidizing.

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Interesting! I'd seen grease fittings on large conduits before, which were then filled with grease to keep water/air/whatever out. Having worked with grease-filled cables, I'd imagine the air/nitrogen approach is a lot nicer to maintain.

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I've also heard that conduits will be compressed with air to detect cuts and breaks so servicemen know exactly on what haul segment the leak is located.

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