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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 ...
January 28 – In Centralia, Missouri, natural gas at 47 psig entered a low pressure distribution system which normally operated at 0.40 psig after a backhoe bucket snagged, ruptured, and separated a 3/4-inch steel pressure regulator control line at a regulator station. The backhoe, owned and operated by the city of Centralia, was being used to ...
Pressure regulator for domestic water supply. Outlet pressure is set with the blue handwheel and shown on the vertical scale. A water pressure regulating valve limits inflow by dynamically changing the valve opening so that when less pressure is on the outside, the valve opens up fully, and too much pressure on the outside causes the valve to shut.
The gas fire caused major damage to ten homes, and, minor damage to 42 homes. [217] November 19 – Telephone company contractors installing an underground cable hit a 10-inch gas pipeline in Vandyne, Wisconsin. Gas at 750 psi escaped, and ignited about 45 minutes later, killing one of the contractors, and injuring three others. [175]
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 ...
The San Bruno pipeline explosion occurred at 6:11 pm PDT on September 9, 2010, in San Bruno, California, when a 30-inch (76 cm) diameter steel natural gas pipeline owned by Pacific Gas & Electric exploded into flames in the Crestmoor residential neighborhood 2 miles (3.2 km) west of San Francisco International Airport [4] near Skyline Boulevard and San Bruno Avenue. [5]