flow measurement Flashcards Preview

IET > flow measurement > Flashcards

Flashcards in flow measurement Deck (24):
1

An _____ is a primary flow element consisting of a thin circular metal plate with a sharp-edged round hole in it

Oriface plate

2

An _____ is the tubing or piping connection that connects flowmeter taps to any differential pressure instrument

Impulse line

3

what two forces are always present in a closed pipe?

Static head due to pressure
Static head due to elevation

4

When steam flow is measured, the measuring instrument must be located _____ the flow element

Below

5

Venturi tubes, orfice plates, and flow nozzles measure what?

Flow

6

_____ is the ratio of maximum flow to minimum flow at the desired measurement

Rangeability

7

When liquid flow is measured, the presence of _____ in impulse lines ruins accuracy

Air bubbles

8

A _____ valve is a valve used at a differential measuring instrument to equalize pressure in a differential instrument

Blocking

9

Pressure sensing taps are located _____ and _____ from a flow nozzle

Upstream
Downstream

10

When can flow measurement become inaccurate?

When flowing conditions change from when the system was designed

11

A _____ tube is a primary flow element consisting of an aerodynamic internal cross section with the low pressure connection at the throat

Low Loss

12

A _____ is a pressure connection

Tap

13

A _____ is a primary flow element consisting of a fabricated pipe section with a converging inlet section, a straight throat, and a diverging outlet section

Venturi tube

14

A _____ is a small metal or plastic rotameter with an adjustable valve at the inlet or outlet of the meter to control the flow rate of the purge fluid

Purge Meter

15

A _____ meter is a mechanical flowmeter consisting of turbine blades mounted on a wheel that measure the velocity of a liquid steam by counting the pulses produced by the blades as they pass an electromagnet pickup

Turbine

16

A _____ or _____ meter is a flowmeter consisting of an orifice as part of the float assembly that acts as a guide

Shaped-float or Orfice

17

A _____ shredding meter is a flowmeter consisting of a pipe section with a symmetrical vertical bluff body (partial dam) across the flowing stream

Vortex

18

What is a thermal mass meter?

Two thermal sensors with a heat element between them that measure the temperature difference on either side

19

how does an ultrasonic flowmeter measure flow?

Sound emitters send sound waves with and against the current to measure the difference in travel time for the waves

20

with a vortex shredding meter, the frequency of the fluid that is released can be measured with _____ meters

Ultrasonic

21

A _____ meter is a flowmeter consisting of a stainless steel tube lined with a non-conductive material, with two electrical coils mounted on the tube like a saddle

Magnetic

22

The detectors for coriolis meters consist of a _____ and _____ mounted on each tubing section at the points of maximum motion

Magnet
Coil

23

A coriolis meter can also measure _____

Density

24

A _____ meter is a mass flowmeter consisting of specially formed tubing that is oscillated at a right angle to the flowing mass of fluid

Coriolis