VOLTAGE DROP

The voltage drop around a circuit including wiring and loads must equal the supply voltage.

Related Terms

RESTRICTOR

A device for producing a deliberate pressure drop or resistance in a line by reducing the cross-sectional flow area.

restrictor pressure_drop pressure device flow line resistance drop

FILTER RATED CAPACITY

The amount of contaminants a filter will hold before an excessive pressure drop is caused. Some filters have bypass valves which open when a filter reaches its rated capacity.

filter_rated_capacity rated_capacity contaminant pressure_drop pressure filter hold bypass drop open valves

APPARENT VOLTAGE

The apparent voltage, as measured by the drop in pressure due to a current flowing through a resistance. (EMF)

apparent emf pressure current drop

A method which involves placing a drop of fluid on a permeable piece of paper and noting the development and nature of the halos, or rings, surrounding the drop through time. The roots of this test can be traced to the 1940s, when railroads used the 'blotter spot' tests.

paper_chromatography fluid paper test drop

REACTION TURBINE

A reaction turbine utilizes a jet of steam that flows from a nozzle on the rotor. Actually, the steam is directed into the moving blades by fixed blades designed to expand the steam. The result is a small increase in velocity over that of the moving blades. These blades form a wall of moving nozzles that further expand the steam. The steam flow is partially reversed by the moving blades, producing a reaction on the blades. Since the pressure drop is small across each row of nozzles (blades), the speed is comparatively low. Therefore, more rows of moving blades are needed than in an impulse turbine.

reaction_turbine rotor impulse_turbine pressure steam flow turbine velocity nozzle pressure_drop speed wall drop fixed form

FLASHING

The process whereby a drop in pressure or increase in temperature cause vaporization.

flashing vaporization pressure temperature process drop

SIPHON

A pigtail-shaped pipe or a drop leg in the pipe leading to a steam pressure gauge, serving to trap water in the gauge and prevent overheating from direct contact with steam.

siphon pressure_gauge pressure steam water pipe overheating contact drop leg trap

ATOMIZATION

The process whereby a volume of liquid is converted into a multiplicity of small drops. The principal goal is to produce a high surface area to mass ratio so that the liquid will vaporize quickly and thus be susceptible to combustion.

atomization liquid drop vapor combustion surface volume area mass process ratio high

BLOWBACK

The number of pounds per square inch of pressure drop in a boiler from the point where the safety valve pops to the point where the safety valve reseats.

blowback pressure_drop boiler safety_valve pressure safety valve drop square

BOIL-OFF

Boil-off is the vapor produced above the surface of a boiling cargo due to evaporation. It is caused by heat ingress or a drop in pressure.

boil_off vapor evaporation cargo heat pressure surface boiling drop