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Instrumentation Key Terms > Chapter 3 And 4 > Flashcards

Chapter 3 And 4 Flashcards

1
Q

A special kind of head pressure measuring method allowing the measurement of head pressure in a liquid without the pressure sensor coming in contact with the process fluid

A

Blubber

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2
Q

Monitors all level points in a tank from the zero percent level (bottom of the measuring device) to 100% full.

A

Continous level measurement

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3
Q

A distance from the surface of a liquid that extends downward

A

Depth

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4
Q

Measures the process variable directly in terms of itself ( e.g a sight glass or dipstick).

A

Direct level measurement

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5
Q

A sealed cyndrically shaped tube used to measure bouyancy

A

Displacer

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6
Q

There are three types of flat glass level gauges , reflex , transparent and welded pad. The heavy thick bodied glass promotes safety in high temperature and high pressure hydrocarbon service

A

Flat-glass level gauge

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7
Q

An instrument that used cables ,pulleys , levers or any other mechanism to convey the position of a float to a liquid level

A

Float gauge

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8
Q

A distance from zero reference point to the surface

A

Height

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9
Q

Liquid head pressure measurement expression;also expressed pounds per square inch (psi)

A

Inches of water column

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10
Q

Measures another process variable(e.g head pressure or weight) in order to infer level

A

Indirect level measurement

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11
Q

The measurement from the bottom of a tank to the surface of the product

A

Innage

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12
Q

A plane where two materials meet . Can be between two liquids , a liquid and a slurry , and or liquid and foam

A

Interface level

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13
Q

The act of establishing the height of a liquid surface in reference to zero point

A

Level measurement

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14
Q

The pressure exerted by the height of a column of liquid;the most common indirect level measurement.

A

Liquid (hydrostatic) head pressure

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15
Q

A device comprised of a strain gauge bonded to a robust support column called a force beam ; together these are capable of supporting the entire weight os a vessel and its contents ; a transducer that measures force or weight.

A

Load cell

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16
Q

The curved upper surface of a column of liquid having either a convex or concave shape

A

Meniscus

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17
Q

Uses a tightly controlled gamma radiation source with a detector to infer a level in a tank and used when other technologies are unsuccessful;located on the outside of a tank and impervious to the effects of adverse process conditions;commongamma radiation sources are the radioisotopes cobalt 60 and cesium 137

A

Nuclear device

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18
Q

A measurement of level based upon percentage with zero percent level at the bottom of the measuring device and 100% level being at the top

A

Percent level measurement

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19
Q

Level is measured at one distinct point in a tank

A

Point level measurement

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20
Q

Liquid head pressure measurement expression; also expressed as inches of water column

A

Pounds per square inch (Psi)

21
Q

Has a single flat glass panel capable of refracting light off a prism like back side creating a silvery contrast above the liquid level that allows it to be seen from a distance

A

Reflex level gauge

22
Q

A natrow strip of calibrated ribbon(steel) used to measure length

A

Tape gauge

23
Q

Has two transparent flat glass panels,front and back, thqt form a vertical chamber in conjunction with the metal sides where the process level can be seen and measure using this vertical chamber.

A

Transparent level gauge

24
Q

A reflex or clear glass tube open into a vessel on top and bottom

A

Tubular type sight glass

25
Q

The measurement from the surface of the product to the top of the tank

A

Ullage(outage)

26
Q

An accurate distance measuring instrument usually inserted at the top of the vessel; emmits a pulse of energy that is reflected off the surface of the material back to the receiver ; may be either a single unit (transponder) or two separate units ( transmitter aand receiver

A

Ultrasonic and radar device

27
Q

Generally made of flat glass and integrally mounted to the vessel by either welded or flanged connection with threaded pipe; extremely rugged to prevent vessel drainout

A

Welded pad gauge

28
Q

Most common types of level sensing and measurement devices in process industries

A 
Gauge or sigthglass
Float
Tape gauge
Differential pressure cell 
Bubbler
Displacer
Ultrasonic device 
Nuclear device 
Load cell
29
Q

A trademark name for one manufacturer multiport tube having four impact points spaced across the pipe and facing the flow with another tube sensing static pressure measures the average pressure produced by the four impact points

A

Annubar tube

30
Q

A magnetic flow meter designed to determine volumetric flow of electrically conductive liquids slurries and corrosive and or abrasive materials

A

Electromagnetic flow meter

Magmeter

31
Q

Flow rate( an instantaneous flow measurement) and total flow (a summation of instantaneous flow rates over a time interval or an accumulation of counts provided by a positive displacement device)’measured in volume or mass u its respect to time

A

Flow measurement

32
Q

Similar to a venture tube but has an extended tapered i let commonly installed in a short piece of pipe called a spool piece.

A

Flow nozzle

33
Q

A measure of how much fluid moves through a pipe or channel with a given period of time

A

Flow rate

34
Q

Flowing liquids and gases that mix easily because of the continual movement between molecules

A

Fluid

35
Q

Measuring one variable of a process to infer another

A

Indirect flow measurement

36
Q

Smooth flowing fluid

A

Laminar flow

37
Q

The most common type of true mass flow meter;a meter that elimantes the need to compensate for typical process variations such as temperature , pressure,density,and even viscosity

A

Mass flow meter coriolis

38
Q

A unit of measure for the weight being passed through the pipe to allowed pressures upstream and downstream of an orifice plateto be measure

A

Oriface flange

39
Q

A piece of 1/8 to 1/12 inch thick metal with a calibrated hole drilled or cut through types of orifice plates include the concentric plate eccentric bore, and segmental plate

A

Orifice plate

40
Q

A common way to indicate a flowing process with 100% equating to an actual quantity such as gallons per minute (gpm)

A

Percentage flow rate

41
Q

An L shaped tube that is inserted into a pipe with its open end facing the tube and another tube sensing static pressure

A

Pilot tube

42
Q

When flow is measured in absolute volumes where the flowing materials is admitted into a chamber known volume and the transferred to a discharge point ; a counter registers the number of times the chamber fills and discharges

A

Positive displacement flow measurement

43
Q

Piston oval gear nutating disk and rotary vane types of positive displacement flow meters

A

Positive displacement meter

44
Q

A mathematical computation describing the flow of fluids numerically

A

Reynolds number

45
Q

A direct read variable area (tapered) flow tube where the fluid enters through the bottom then flows upward lifting a free floating indicator plummet (float) the position of the float references to the calibrated marks on the glass tube to indicate flow rate

A

Rotameter

46
Q

A flow tube containing a free-spinning turbine (fan) wheel where the revolutions per minute (rpm) are proportional to flow rate ; the faster the flow the faster the turbine spins ;the output is fed directly into an instrument to indicate either flow rate or total flow

A

Turbine meter

47
Q

Fluid flowing with turbulance

A

Turbulent flow

48
Q

A primary element used in pipelines to create a differential pressure such that when converted to flow units (e.g.gpm) the flow in the line is measured

A

A unit of measure for the volume being passed through a certain location in a pipe or channel per unit ; usually measured in gallons per minute and cubic feet per minute

49
Q

The most common types of flow sensing and measuring devices

A 
Orifice plates 
Venturi tubes
Flow nozzles
Pilot tubes 
Annubar
Rotameters
Electromagnetic meter 
Turbine meters
Mass flow meters

Instrumentation Key Terms (5 decks)

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