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  2. Water hammer - Wikipedia

    en.wikipedia.org/wiki/Water_hammer

    This pressure wave can cause major problems, from noise and vibration to pipe rupture or collapse. It is possible to reduce the effects of the water hammer pulses with accumulators, expansion tanks, surge tanks, blowoff valves, and other features. The effects can be avoided by ensuring that no valves will close too quickly with significant flow ...

  3. Merrimack Valley gas explosions - Wikipedia

    en.wikipedia.org/wiki/Merrimack_Valley_gas...

    According to the NTSB's preliminary report, customers in the accident area received gas from a low-pressure (0.5 psi) distribution network which, in turn, was fed from a high-pressure (75 psi) main pipeline via regulators controlled by sensors measuring pressure in the low-pressure pipes. At the time of the accident, workers were replacing some ...

  4. Pressure regulator - Wikipedia

    en.wikipedia.org/wiki/Pressure_regulator

    A typical nominal regulated gauge pressure from a medical oxygen regulator is 3.4 bars (50 psi), for an absolute pressure of approximately 4.4 bar and a pressure ratio of about 4.4 without back pressure, so they will have choked flow in the metering orifices for a downstream (outlet) pressure of up to about 2.3 bar absolute.

  5. List of pipeline accidents in the United States in the 1990s

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

    January 2 – A crew installing a water main hit a 6-inch gas main at 450 psi of pressure in Novi, Michigan. Gas company workers were trying to install a sleeve over the failure when the gas exploded and burned, injuring 6 of the Gas Company crew. A telephone cable was also damaged, knocking out phone service for about 5-- customers. [32]

  6. Gas leak leaves schools, homes, businesses in North Idaho ...

    www.aol.com/news/gas-leak-leaves-schools-homes...

    A gas leak has affected homes and businesses across North Idaho, leaving thousands of customers without heat and hot water. Avista Utilities, a company that provides electric and natural gas in ...

  7. Reduced pressure zone device - Wikipedia

    en.wikipedia.org/wiki/Reduced_pressure_zone_device

    A reduced pressure zone device (RPZD, RPZ, or RPZ valve) is a type of backflow prevention device used to protect water supplies from contamination. RPZDs may also be known as reduced pressure principle (RP), reduced pressure principle backflow prevention devices, [1] [2] reduced pressure zone assemblies (RPZA), [3] or reduced pressure principle ...