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  2. List of pipeline accidents in the United States (1900–1949)

    en.wikipedia.org/wiki/List_of_pipeline_accidents...

    December 20 – In Beaver Falls, Pennsylvania, two children were fatally burned and five injured in a gas explosion and fires that destroyed three houses.The explosions were caused by the breaking of a valve gate on the Fort Pitt Gas Line, which allowed leaking gas to seep into the houses' cellars, following water pipes from the street.

  3. Double-walled pipe - Wikipedia

    en.wikipedia.org/wiki/Double-walled_pipe

    Dual-wall stainless steel tubing is most commonly used in semiconductor plants for the containment of highly toxic gases. A leak detection system in the containment pipe indicates if the carrier pipe is leaking. Double wall pipes are usually hydrostatically tested, or tested to hold and maintain a target gas pressure before the first use.

  4. Double chimney - Wikipedia

    en.wikipedia.org/wiki/Double_chimney

    A double chimney (or double stack, double smokestack in American English) is a form of chimney for a steam locomotive, where the conventional single opening is duplicated, together with the blastpipe beneath it. Although the internal openings form two circles, the outside appearance usually forms a single elongated oval.

  5. Chimney - Wikipedia

    en.wikipedia.org/wiki/Chimney

    Sometimes weep holes are placed at the bottom of the chimney to drain out collected water. A chimney cowl or wind directional cap is a helmet-shaped chimney cap that rotates to align with the wind and prevent a downdraft of smoke and wind down the chimney. An H-style cap is a chimney top constructed from chimney pipes shaped like the letter H ...

  6. Flue - Wikipedia

    en.wikipedia.org/wiki/Flue

    A seven-flue chimney in a four-storey Georgian house in London, showing alternative methods of sweeping. A flue is a duct, pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors. Historically the term flue meant the chimney itself. [1]

  7. Stack effect - Wikipedia

    en.wikipedia.org/wiki/Stack_effect

    The stack effect or chimney effect is the movement of air into and out of buildings through unsealed openings, chimneys, flue-gas stacks, or other purposefully designed openings or containers, resulting from air buoyancy. Buoyancy occurs due to a difference in indoor-to-outdoor air density resulting from temperature and moisture differences ...

  8. Fix problems signing in to AOL Mail

    help.aol.com/articles/fix-problems-signing-in-to...

    Sometimes the old "turn it off and on again" actually works. In this case, try completely signing out of your account then sign back in. Many times, this will help, especially in cases of bad passwords or some simple browser issues.

  9. Chimney fire - Wikipedia

    en.wikipedia.org/wiki/Chimney_fire

    Regular chimney sweeping removes creosote and prevents fires in the chimney. Steps to prevent this buildup of deposits include only running appliances hot during the initial ignition phase regularly, only building short and hotter fires, regular cleaning of flues using a chimney sweep, and only using internal chimney structures where possible versus a chimney attached to an external wall.

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