A gasoline line is connected to a pressure gauge through a double U-shaped manometer, as shown from Figure 1. a) If the gauge pressure reading is 370 kPa, determine the gauge pressure of the gasoline (kPa). b) If the gauge pressure reading is 240 kPa, determine the gauge pressure of the gasoline (kPa). c) Indicate the pressure difference between the measured pressure and the calculated pressure. Assumptions: 1 - All liquids are incompressible. 2 - The effect of the air column on the pressure is insignificant. Properties: The specific gravities (GE) or also called the relative density (DR) of the oil, mercury and gasoline are 0.79; 13.6 and 0.70; respectively. Consider the density of water ρH O = 1000 kg/m and gravity as g = 9.81 m/s². Tip: Starting with the pressure indicated by the pressure gauge and moving along the tube adding (as we go down) or subtracting (as we go up) the ρgh terms until we get to the tube of gasoline, and set the result equal to P .
A gasoline line is connected to a pressure gauge through a double U-shaped manometer, as shown from Figure 1. a) If the gauge pressure reading is 370 kPa, determine the gauge pressure of the gasoline (kPa). b) If the gauge pressure reading is 240 kPa, determine the gauge pressure of the gasoline (kPa). c) Indicate the pressure difference between the measured pressure and the calculated pressure. Assumptions: 1 - All liquids are incompressible. 2 - The effect of the air column on the pressure is insignificant. Properties: The specific gravities (GE) or also called the relative density (DR) of the oil, mercury and gasoline are 0.79; 13.6 and 0.70; respectively. Consider the density of water ρH O = 1000 kg/m and gravity as g = 9.81 m/s². Tip: Starting with the pressure indicated by the pressure gauge and moving along the tube adding (as we go down) or subtracting (as we go up) the ρgh terms until we get to the tube of gasoline, and set the result equal to P .
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
A gasoline line is connected to a pressure gauge through a double U-shaped manometer,
as shown from Figure 1.
a) If the gauge pressure reading is 370 kPa, determine the gauge pressure of the
gasoline (kPa).
b) If the gauge pressure reading is 240 kPa, determine the gauge pressure of the
gasoline (kPa).
c) Indicate the pressure difference between the measured pressure and the calculated pressure.
Assumptions: 1 - All liquids are incompressible. 2 - The effect of the air column on the pressure is insignificant. Properties: The specific gravities (GE) or also called the relative density (DR) of the oil, mercury and gasoline are 0.79; 13.6 and 0.70; respectively. Consider the density of water ρH O = 1000 kg/m and gravity as g = 9.81 m/s². Tip: Starting with the pressure indicated by the pressure gauge and moving along the tube adding (as we go down) or subtracting (as we go up) the ρgh terms until we get to the tube of gasoline, and set the result equal to P .
Transcribed Image Text:Figura 1 – Manômetro duplo.
Pmedida = 240 kPa
Pmedida = 370 kPa
Óleo GE = 0,79
Óleo GE = 0,79
Gasolina GE = 0,70
Gasolina GE = 0,70
45 cm
45 cm
Duto
Duto
Ar
Ar
22 cm
22 cm
50 cm
50 cm
10 cm
10 cm
Mercúrio GE = 13,6
Mercúrio GE = 13,6
Água
Água
(a)
(b)
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