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2. Pipe plug - Wikipedia

   en.wikipedia.org/wiki/Pipe_plug

   Pipe plugs provide a trench-less method for the maintenance of drains and sewers, and construction and testing of non-pressurized gravity pipelines. There are three main purposes of pipe plugs. These are temporary sealing or stopping the fluid flow in a pipeline, leak testing and by-passing the flow.

3. Deep freeze breaks pipes, creates water crisis across South - AOL

   www.aol.com/weather/deep-freeze-breaks-pipes...

   Days of freezing temperatures in Deep South areas that usually freeze for only hours are threatening dozens of water systems as burst pipes leak millions of gallons of water. The problems were ...

4. Efforts to stem the Deepwater Horizon oil spill - Wikipedia

   en.wikipedia.org/wiki/Efforts_to_stem_the...

   [7] [8] The second technique, placing a 125-tonne (276,000 lb) containment dome (which had worked on leaks in shallower water) over the largest leak and piping the oil to a storage vessel on the surface, failed when gas leaking from the pipe combined with cold water formed methane hydrate crystals that blocked the opening at the top of the dome ...

5. 2014 Elk River chemical spill - Wikipedia

   en.wikipedia.org/wiki/2014_Elk_River_chemical_spill

   However, the DEP, whose inspectors discovered the leak at 11:10 a.m. in response to residents' complaints about the odor, [4] contradicted Southern's claim. When the department's inspectors arrived at the facility, they observed the MCHM leaking through a concrete block containment dike with no cleanup or containment measures underway.

6. How to Fix Your Frozen Pipes, According to Experts - AOL

   www.aol.com/keep-pipes-freezing-winter-according...

   Pipes near exterior walls or foundation: These are most susceptible to freezing. Exposed pipes in crawl spaces or attics : Lack of insulation increases their vulnerability.

7. Gas leak - Wikipedia

   en.wikipedia.org/wiki/Gas_leak

   A gas leak refers to a leak of natural gas or another gaseous product from a pipeline or other containment into any area where the gas should not be present. Gas leaks can be hazardous to health as well as the environment. Even a small leak into a building or other confined space may gradually build up an explosive or lethal gas concentration. [1]