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  2. Drain-waste-vent system - Wikipedia

    en.wikipedia.org/wiki/Drain-waste-vent_system

    In the U.S., every plumbing fixture must also be coupled to the system's vent piping. [1] Without a vent, negative pressure can slow the flow of water leaving the system, resulting in clogs, or cause siphonage 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.

  3. Miles per gallon gasoline equivalent - Wikipedia

    en.wikipedia.org/wiki/Miles_per_gallon_gasoline...

    The miles per gallon equivalent cost of an alternative fuel vehicle can be calculated by a simple formula to directly compare the MPG operating costs (rather than the energy consumption of MPGe [7]) with traditional vehicles since the cost of resources varies substantially from region to region. [5] [4] For reference, the complete equation is:

  4. Backflow prevention device - Wikipedia

    en.wikipedia.org/wiki/Backflow_prevention_device

    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.

  5. Fuel saving device - Wikipedia

    en.wikipedia.org/wiki/Fuel_saving_device

    It is claimed to increase vehicle fuel economy by up to 25% through "power conditioning of the vehicle's electrical systems", [17] but Consumer Reports detected no difference in economy or power in tests on ten separate vehicles, finding that the device did nothing but light up. [18]

  6. Spark arrestor - Wikipedia

    en.wikipedia.org/wiki/Spark_arrestor

    The Spark Arrester Guide is used by field inspectors and consumers to verify product certification status. Manufacturers pursuing spark arrester qualification in the United States should consult the USDA Forest Service's "Manufacturer's Submission Procedure" for both general purpose [ 6 ] and small engine [ 7 ] spark arresters.

  7. Fuel efficiency - Wikipedia

    en.wikipedia.org/wiki/Fuel_efficiency

    The displayed fuel economy is 18.1 km/L (5.5 L/100 km; 43 mpg ‑US). A Briggs and Stratton Flyer from 1916. Originally an experiment in creating a fuel-saving automobile in the United States, the vehicle weighed only 135 lb (61.2 kg) and was an adaptation of a small gasoline engine originally designed to power a bicycle.

  8. Detonation flame arrester - Wikipedia

    en.wikipedia.org/wiki/Detonation_flame_arrester

    If the mixture is ignited and the flame begins to travel back through the piping, the arrester will prohibit the flame from moving back to the gas source. Most detonation flame arrester applications are in systems which collect gases emitted by liquids and solids. These systems, commonly used in many industries, may be called vapor control systems.

  9. List of abbreviations used in sanitation - Wikipedia

    en.wikipedia.org/wiki/List_of_abbreviations_used...

    LCC - Life-cycle cost, see Whole-life cost or Life-cycle cost analysis; LCCA - Life-cycle cost analysis; LGA - Local government area; LMICs - Low and middle income countries; LNOB - Leave no one behind; lpcd - Liters per capita per day (liters per person per day), e.g. for daily wastewater flowrate

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