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Backflow prevention device. The simplest, most reliable way to provide backflow prevention is to provide an air gap.An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool.
In the U.S., every plumbing fixture must also be coupled to the system's vent piping. [1] Without a vent, negative pressure from water leaving the system can slow flow (resulting in clogs) or cause a siphon to empty a trap. The high point of the vent system (the top of its "soil stack") must be open to the exterior at atmospheric pressure.
The OBSS was grappled by the shuttle's robotic arm and used to inspect Endeavour ' s thermal protection system for damage from orbital debris. The imagery will be analyzed to clear the shuttle for reentry. [NASA 26] Meanwhile, the foam loss on the external tank was initially attributed to substrate contamination ahead of the application of the ...
Prepared a nitrogen tank assembly for removal, and the new tank was stowed on an External Stowage Platform to prepare for installation. Removed a television camera with failed power supply. [39] EVA 3 Fossum Garan June 8, 2008 13:55 June 8, 2008 20:28 6 hours, 33 minutes Removed and replaced the starboard nitrogen tank assembly.
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A flame arrester during testing A flame arrester made for a 91 cm (36 inch) pipe weighing 10 tons. A flame arrester (also spelled arrestor), deflagration arrester, [1] or flame trap [2] is a device or form of construction that will allow free passage of a gas or gaseous mixture but will interrupt or prevent the passage of flame. It prevents the ...
Holiday travelers setting out for what is expected to be one of the busiest travel weekends of the year are already facing delays as a severe round of storms rolls into the Southern US.
The world’s oldest known wild bird has sparked “special joy” among scientists after she laid an egg – her first in four years – at the age of 74.
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