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The M&M Subdivision was the site of the deadliest crash in Amtrak's history. On September 22, 1993 at 2:45 a.m., a barge lightly struck the line's bridge over Big Bayou Cannot near Mobile. The bridge had been designed as a swing bridge, but the center span was never operational and was not fully secured from movement when it was built. The ...
A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.
The majority of guidance available for design of heat and smoke building vents installed in buildings is restricted to nonsprinklered, single-story buildings. [4] This is partly a historical consequence of the installation of heat and smoke vents following the August 1953 General Motors, Livonia, MI major fire in a nonsprinklered manufacturing facility which effectively stopped the production ...
Vertical ventilation takes place through holes cut in the roof, typically by truck companies during the early stages of a fire in a process known collectively as roof operations, while horizontal ventilation usually takes place through doors and windows. The goal of each is to clear heat and smoke to increase chances of survival for trapped ...
A trickle vent is a very small [quantify] opening in a window or other building envelope component to allow small amounts of ventilation in spaces intended to be naturally ventilated when major elements of the design—windows, doors, etc.—are otherwise closed.
0.30 L/s/m 2: Spaces where space contamination is normal, or similar to an office environment: Conference rooms, lobbies 0.12 cfm/ft 2: 0.60 L/s/m 2: Spaces where space contamination is significantly higher than an office environment: Classrooms, museums 0.18 cfm/ft 2: 0.90 L/s/m 2: Spaces where space contamination is even higher than the ...
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The placement of the sensors should be able to provide an accurate representation of the space, usually placed in a return duct or on the wall. [5] As the sensor reads the increasing amount of carbon dioxide levels in a space, the ventilation increases to dilute the levels.