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  2. Automatic bleeding valve - Wikipedia

    en.wikipedia.org/wiki/Automatic_bleeding_valve

    In a closed heating system though, it has no other means of escape and builds up. An air bubble trapped within a radiator means that no hot water circulates in the upper part and so the heating power of the radiator is reduced. If air is trapped within the boiler this may cause pump cavitation or boiling and overheating within the heat exchanger.

  3. Water-tube boiler - Wikipedia

    en.wikipedia.org/wiki/Water-tube_boiler

    The older fire-tube boiler design, in which the water surrounds the heat source and gases from combustion pass through tubes within the water space, is typically a much weaker structure and is rarely used for pressures above 2.4 MPa (350 psi). A significant advantage of the watertube boiler is that there is less chance of a catastrophic failure ...

  4. Uniform Swimming Pool, Spa and Hot Tub Code - Wikipedia

    en.wikipedia.org/wiki/Uniform_Swimming_Pool,_Spa...

    Designated as an American National Standard, the Uniform Swimming Pool, Spa and Hot Tub Code (USPSHTC) is a model code developed by the International Association of Plumbing and Mechanical Officials to govern the installation and inspection of plumbing systems associated with swimming pools, spas and hot tubs as a means of promoting the public's health, safety and welfare.

  5. Hot tub - Wikipedia

    en.wikipedia.org/wiki/Hot_tub

    A 5-seat hot tub with a cast acrylic shell, supported by a frame structure, showing vents for water circulation and massage Outdoor hot tubs. A hot tub is a large tub full of water used for hydrotherapy, relaxation or pleasure. Some have powerful jets for massage purposes. Hot tubs are sometimes also known as "spas" or by the trade name Jacuzzi ...

  6. College Football Playoff first round showed system is broken ...

    www.aol.com/college-football-playoff-already...

    It's already broken and bombing. That doesn't mean the College Football Playoff can't be fixed with the right plan. It's actually pretty simple.

  7. Why the Dow is suddenly in a historic funk - AOL

    www.aol.com/finance/why-dow-suddenly-historic...

    The Dow's losses amount to roughly 3%, or more than 1,500 points, in the past nine trading sessions. The index has fallen from a record close of 45,014 on Dec. 4 to 43,499 as of Tuesday's close.

  8. Shop these 10 thoughtful gifts under $50 from Nordstrom that ...

    www.aol.com/lifestyle/shop-these-10-thoughtful...

    For the really late shoppers, you can get your gifts in time if you order by 12 pm EST on December 22 and select two-day shipping at checkout, but don't wait too long; these hot-ticket items won't ...

  9. Troubleshooting - Wikipedia

    en.wikipedia.org/wiki/Troubleshooting

    Troubleshooting is a form of problem solving, often applied to repair failed products or processes on a machine or a system. It is a logical, systematic search for the source of a problem in order to solve it, and make the product or process operational again. Troubleshooting is needed to identify the symptoms.