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LESSON 1. Principles of Measurement. Let the Games Begin!. Objectives. Measurement of temperature and pressure Units of measurement Measurement devices. References. Introduction to Naval Engineering Principles of Naval Engineering. Purpose of Measuring Devices.

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Presentation Transcript
objectives
Objectives
  • Measurement of temperature and pressure
  • Units of measurement
  • Measurement devices
references
References
  • Introduction to Naval Engineering
  • Principles of Naval Engineering
purpose of measuring devices
Purpose of Measuring Devices
  • Why essential to proper operation of propulsion plants?
what is temperature
WHAT IS TEMPERATURE?
  • An indication of the internal energy contained in a substance
    • Mono-Atomic Gases: Linearly proportional
    • Poly-Atomic Gases: translational, rotational and vibrational kinetic energy.
  • Temp is a measure of but not directly proportional to internal kinetic energy.
measurement of temperature
Measurement of Temperature
  • Relative Scales
    • Fahrenheit (°F)
    • Celsius (°C)
  • Absolute Scales
    • Rankine (°R)
    • Kelvin (K)
temperature relationships
Temperature Relationships

(°F) = 9/5*(°C) +32

(°C) = 5/9*[(°F) –32]

(°F) = (°R) – 459.67

(°C) = (K) – 273.15

measurement of pressure
Measurement of Pressure
  • Definition: Force per unit area
  • Units of measurement
    • Pounds force per square inch (psi)
    • Inches Hg or inches H2O (“Hg)
    • Atmospheres (atm)
pressure relationships
Pressure Relationships
  • Gage pressure (PSIG)
  • Absolute pressure (PSIA)
  • Vacuum pressure (PSIV) or (in Hg)
  • Atmospheric pressure (14.7 psi)
pressure relationships10
Pressure Relationships

Absolute Pressure = Atmospheric Press. + Gage Press.

Vacuum = Atmospheric Pressure - Absolute Pressure

pressure relationships11
Pressure Relationships

30 PSIA

15.3 PSIG

GAGE

PRESSURE

(PSIG)

ABSOLUTE

PRESSURE

(PSIA)

Atmospheric Pressure

14.7 PSIA

0 PSIG

(Average at Sea Level)

0 In. Hg

VACUUM

(in. Hg)

0 PSIA

29.92 In. Hg

principle of operation temperature devices
Principle of OperationTemperature Devices
  • Expansion Thermometers
    • Liquid in glass
    • Bimetallic
    • Filled system/distant reading
  • Pyrometers
    • Thermocouple
    • Resistance
    • Radiation and optical pyrometers
expansion thermometer
Expansion Thermometer
  • Liquid in Glass
  • Bimetallic
  • Filled System/Distant Reading
expansion thermometer14
Expansion Thermometer
  • Liquid in Glass
  • Bimetallic
  • Filled System/Distant Reading
expansion thermometer15
Expansion Thermometer
  • Liquid in Glass
  • Bimetallic
  • Filled System/Distant Reading
expansion thermometer16
Expansion Thermometer
  • Liquid in Glass
  • Bimetallic
  • Filled System/Distant Reading
pyrometers
Pyrometers
  • Thermocouple
  • Resistance
  • Radiation and Optical
pyrometers18
Pyrometers
  • Thermocouple
  • Resistance
  • Radiation and Optical
pyrometers19
Pyrometers
  • Thermocouple
  • Resistance
  • Radiation and Optical
pyrometers20
Pyrometers
  • Thermocouple
  • Resistance
  • Radiation and Optical
operation of pressure measuring devices
Operation of Pressure Measuring Devices
  • Manometers
  • Bourdon tube
  • Bellows gage
operation of pressure measuring devices22
Operation of Pressure Measuring Devices
  • Manometers
  • Bourdon tube
  • Bellows gage
operation of pressure measuring devices23
Operation of Pressure Measuring Devices
  • Manometers
  • Bourdon tube
  • Bellows gage
operation of pressure measuring devices24
Operation of Pressure Measuring Devices
  • Manometers
  • Bourdon tube
  • Bellows gage