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According to a National Fire Protection Association report, a hotel worker — identified in the local media as Chamnien Suthho, the manager of the eatery — who had been investigating the smell attempted to shut off the valve on the cylinder and unwittingly increased the flow of vapor. [10]
In natural gas furnaces, water heaters, and room heating systems, a safety cut-off switch is normally included so that the gas supply to the pilot and heating system is shut off by an electrically operated valve if the pilot light goes out. This cut-off switch usually detects the pilot light in one of several ways: A flame rectification device. [2]
As he recoiled from the flow, the operator partly pulled off the valve handle. The fireman, losing sight of the operator, turned on the water supply to the sprays fitted to the sphere and, with the operator, attempted to reposition the valve handle and shut the valve. They failed to do so. The time was now approximately 06:40.
A shutdown valve (also referred to as SDV or emergency shutdown valve, ESV, ESD, or ESDV; or safety shutoff valve) is an actuated valve designed to stop the flow of a hazardous fluid upon the detection of a dangerous event. This provides protection against possible harm to people, equipment or the environment.
The control room operators saw the leak on closed-circuit television and began to shut down the plant. However, valves that would have prevented further release of chemicals had to be shut off manually. Operators in the vicinity of the leak attempted to reach manual shutoff valves but were driven back by the vapor cloud. As a result, the ...
Flare stack at the Shell Haven refinery in England. A gas flare, alternatively known as a flare stack, flare boom, ground flare, or flare pit, is a gas combustion device used in places such as petroleum refineries, chemical plants and natural gas processing plants, oil or gas extraction sites having oil wells, gas wells, offshore oil and gas rigs and landfills.
Valves can be categorized into the following types, based on their operating mechanism: Ball valve, for on–off control without pressure drop. Ideal for quick shut-off, since a 90° turn completely shuts off, compared to multiple 360° turns for other manual valves; Butterfly valve, for on–off flow control in large diameter pipes
Service valves are fitted to the outlet from the tank to the service line. These have a tap to turn the fuel on and off. The tap is usually only closed when the tank is being worked on. In some countries, an electrical shut-off valve is built into the service valve. Two Sherwood valves. 1995 on left, 1989 on right
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