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  2. Duct leakage testing - Wikipedia

    en.wikipedia.org/wiki/Duct_leakage_testing

    With the house pressurized (or depressurized) to 50 Pa (-50 Pa) using a blower door, a pressure gauge is attached to the pressure pan by means of a hose. If the pressure difference is near zero, this indicates that the ductwork associated with that particular register is not connected to the outside. A pressure 5 Pa or above indicates that the ...

  3. MAP sensor - Wikipedia

    en.wikipedia.org/wiki/MAP_sensor

    MAP sensors measure absolute pressure. Boost sensors or gauges measure the amount of pressure above a set absolute pressure. That set absolute pressure is usually 100 kPa. This is commonly referred to as gauge pressure. Boost pressure is relative to absolute pressure - as one increases or decreases, so does the other.

  4. Hydrostatic test - Wikipedia

    en.wikipedia.org/wiki/Hydrostatic_test

    The vessel is filled with a nearly incompressible liquid – usually water or oil – pressurised to test pressure, and examined for leaks or permanent changes in shape. Red or fluorescent dyes may be added to the water to make leaks easier to see. The test pressure is always considerably higher than the operating pressure to give a factor of ...

  5. Pressure measurement - Wikipedia

    en.wikipedia.org/wiki/Pressure_measurement

    Example of the widely used Bourdon pressure gauge Checking tire pressure with a spring and piston tire-pressure gauge. Pressure measurement is the measurement of an applied force by a fluid (liquid or gas) on a surface. Pressure is typically measured in units of force per unit of surface area.

  6. Leak-down tester - Wikipedia

    en.wikipedia.org/wiki/Leak-down_tester

    Gauge meter faces can be numbered 0-100 or 100-0, indicating either 0% at full pressure or 100% at full pressure. There is no standard regarding the size of the restriction orifice for non-aviation use and that is what leads to differences in readings between leak-down testers generally available from different manufacturers.

  7. Glossary of boiler terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_boiler_terms

    A non-return valve allowing atmospheric air into the boiler, if a cold boiler reduces its internal pressure on cooling down. This avoids the risk of damage to some types, if their pressure loads are reversed. Few boilers are fitted with these, although the feedwater clack valve usually has a similar effect. Vertical boiler Water-level Water-wall

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