Air trap

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air trap

[′er ‚trap]
(civil engineering)
A U-shaped pipe filled with water that prevents the escape of foul air or gas from such systems as drains and sewers.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Air trap

A U-shaped pipe filled with water and located beneath plumbing fixtures to form a seal against the passage of gas and odors.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved


1. A device to maintain a water seal against sewer gases, air, and odors; also called a stench trap.
2. A removable section of a theater stage floor.
3. Same as traprock.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Inadequate tool venting is a big cause of air traps. Check the number of vents as well as vent depth.
All air with its potential contaminants is evacuated from the box to remove any air traps in the mold.
Users can overlay more than one result at a time on the same model, such as fill time and air traps, weld lines, or core/skin orientation.
Experts said soaring pollution levels could adversely affect athletes' health and performance especially due to "temperature inversion" when a layer of warm air traps pollutants close to the ground.
Today's mold simulation is more like an MRI in its ability to reveal fiber orientation, shrinkage, warpage, cooling rate, shear, air traps, weld lines, and behavior of multi-material and gas-assist injection.
Engineers have been trying to create similarly water repellent surfaces, but past attempts at artificial air traps tended to lose their contents over time due to external perturbations.

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