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Instrumentation > Module 3- Pressure Measurement Standards and Pressure > Flashcards

Module 3- Pressure Measurement Standards and Pressure Flashcards

1
Q

How is flow inferred from pressure

A

measure of the press dropped across a restriction

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2
Q

Define pressure

A

the measurement of force acting on the area of a surface

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3
Q

Pressure formula

A

Force/Area

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4
Q

Pressure units

A

pounds per square inch PSI
Pascals Pa

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5
Q

1 PSI in Pa

A

7000

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6
Q

What does pressure vary depending on

A

weather pressure fonts, sea level

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7
Q

Define Gauge pressure

A

the pressure measured relative to the atmospheric pressure. It is the difference between the absolute pressure of a system and the atmospheric pressure surrounding it

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8
Q

Gauge pressure Formula

A

Absolute pressure - Atmospheric pressure

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9
Q

A gauge pressure device will indicate zero when

A

bled down to atmospheric pressure

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10
Q

Define absolute pressure

A

the total pressure exerted on a system, measured relative to a perfect vacuum (where there is no pressure)

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11
Q

Absolute pressure formula

A

Gauge pressure + Atmospheric Pressure

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12
Q

When would an absolute pressure indicator indicate atmospheric pressure

A

when completely vented down to atmosphere and it would not indicate scale 0

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13
Q

When Absolute pressure is zero what does is Gauge pressure

A

-101.3 kPa(g)

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14
Q

When gauge pressure is 0 what is absolute pressure

A

101.3

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15
Q

What are the 3 basic functions of pressure detector

A

ICA
Indicate
Alarm
Control

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16
Q

List pressure sensor

A

BBC MS
Bourdon tube
Bellow
Pressure Capsule
Manometer
Strain gauge

17
Q

Describe the manometer

A

a fluid-filled
tube where an applied gas pressure causes
the fluid height to shift proportionately

18
Q

why is a manometer consider a differential pressure instrument

A

because it indicates the
difference between two pressures by a shift
in liquid column height

19
Q

List the types of manometer

A

U tube manometer
Well manometer
Raised well manometer
inclined manometer

20
Q

What equation is the manometer based on

A

P1- P2 = rho g h

21
Q

Errors associated with manometer

A

manometer zero
meniscus
parallax
Vapourization of fluid

22
Q

Three pressure standards used with manometer

A

a standard atmosphere
A vertical column of water
A vertical column of mercury

23
Q

properties of manometer liquid

A

low temperature coefficient of expansion
low surface tension
low vapor pressure
immiscible with other liquids

24
Q

What are the typical gauge elements

A

Bellows
Bourdon Tube
Metallic Diaphragms
Capsules

25
Q

Bellows are extremely… and provide

A

extrmely sensitive and provide power for recording activating and indicating mechnisms

26
Q

Define hookes law

A

s, the force required to stretch an elastic object such as a metal spring is directly proportional to the extension of the spring

27
Q

Hookes law formula

A

F=-kx

28
Q

Define the bellows

A

collapsable tank
consist of corrugated or pleated tubes that can expand and contract along their length
pressure is applied to the internal volume and as the pressure changes it expands or contracts to generate an an electrical signal that causes the gauge pointer to move

29
Q

Pressure increase in bellows

A

If the pressure inside the bellows exceeds the external pressure, the bellows will expand.

30
Q

Pressure decrease in bellows

A

If the external pressure is greater than the pressure inside the bellows, it will cause the bellows to contract.

31
Q

Describe the make up of a bourbon tube

A

Thin arch shaped tube that is flattened so that is cross sectional area is that of an ellipse that is permanently fastened at on end

32
Q

Principle of operation of a bourdon tube

A

When pressure is applied to the system is the tube cross section returns to a circular shape and this causes the tube to straighten, the tip of the tube traces a curve this tip movement generates an electrical signal to move theguage pointer

33
Q

Types of bourdon

A

spiral and helical

34
Q

Diaphragms

A

Instrumentation (10 decks)

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