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  2. Helium mass spectrometer - Wikipedia

    en.wikipedia.org/wiki/Helium_mass_spectrometer

    Helium is used as a tracer because it penetrates small leaks rapidly. Helium also has the properties of being non-toxic, chemically inert and present in the atmosphere only in minute quantities (5 ppm). Typically a helium leak detector will be used to measure leaks in the range of 10 −5 to 10 −12 Pa·m 3 ·s −1.

  3. Water detector - Wikipedia

    en.wikipedia.org/wiki/Water_detector

    Electronic components used to make a simple water detector: battery, resistor, transistor, water sensor and piezoelectric buzzer for audible alert A water detector is an electronic device that is designed to detect the presence of water for purposes such as to provide an alert in time to allow the prevention of water leakage.

  4. Basement waterproofing - Wikipedia

    en.wikipedia.org/wiki/Basement_waterproofing

    The Federal Emergency Management Agency (FEMA) recommends basement waterproofing with a water alarm and "battery-operated backup pump" as a preventive measure against the high cost of flooding. [2] Wall conduits (such as dimple boards or other membranes) are fastened to the foundation wall and extend over the new drainage to guide any moisture ...

  5. Cost Of Adding Metal Detectors To Subway Stations In NYC - AOL

    www.aol.com/cost-adding-metal-detectors-subway...

    So, what would it cost to add metal detectors? Each metal detecting machine costs about $2,200, and the city would need four turnstiles per station. That adds up to $8,800.

  6. Leak detection - Wikipedia

    en.wikipedia.org/wiki/Leak_detection

    The primary purpose of leak detection systems (LDS) is to help pipeline controllers to detect and localize leaks. LDS provide alarms and display other related data to the pipeline controllers to assist decision-making. Pipeline leak detection systems can also enhance productivity and system reliability thanks to reduced downtime and inspection ...

  7. February 13–17, 2021 North American winter storm - Wikipedia

    en.wikipedia.org/wiki/February_13–17,_2021...

    The National Oceanic and Atmospheric Administration officially documented US$26.5 billion in damage in the United States from the winter storm. [1] Aon PLC, a finance company, estimated the system to have cost over $196.5 billion in damages, including at least $195 billion in the United States and over $1.5 billion in Mexico. This would make it ...

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