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Flowmeters

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by

Dana Havas

on 5 December 2013

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Transcript of Flowmeters

3.80E-4
Flow meters
Thursday Group 5
rotameter
how it works
Disadvantages
Force Balance
Float Weight
Drag Force + Buoyancy
Float Weight & Buoyancy are constant
increase in flow = increase in annular area
Drag force = drag constant x density x Velocity
velocity = flow-rate x annular area
Advantages
accuracy
some options
Venturi Meter
Nozzle Meter
System uncertainty for our discharge coefficient is between 0.84% to 2.1%.
actual flow-rate of the system
Discharge Coefficient (C)
ideal flow-rate
Q=m/ρt
Q is flow-rate
m is mass
ρ is fluid density
t is time
Q is flow-rate
A is area
β is D2/D1
D is diameter
p is for pressure
p1-p2 is ∆p
ρ is fluid density
1 is for inlet location
2 is for throat location
another equation for flow-rate of system:
therefore:
Chibuzo Akaolisa
Jo Shuang Chang
Dana Havas
Yong Sheng Tan
Schematic
&
Calculations
Conclusion
&
Questions
Review and information on meters
Rotameter
Venturi Meter
Orifice Meter
Nozzle Meter
Schematic
pressure drop of the system
Calculations
satisfactory for gases and liquids

high and low pressure

low pressure drop across meter

low cost

float shape and proportions can vary as per application

simple to install and maintain

linear scale
sensitive to changes in viscosity

difficult adaption to machine reading

chemical compatibility needs to be checked

require vertical runs of pipe
narrow part of taper at bottom
using a rotameter to determine flow-rate
how it works
Utility & Application
Advantages
easy to install in comparison to venturi.

low cost in comparison to the venturi

low energy loss in comparison to orifice plate

Less susceptible to erosion and corrosion than an orifice plate.

Can be installed horizontally or vertically
Disadvantages
Accuracy
turn down ratio (4:1)

2% full scale accuracy
Mechanism
Specifications and Calibration
1% full range Accuracy

Turndown Ratio of 4:1
Application and Utility
Used where high pressure recovery is required

Suitable for measuring flow rates of a wide range of fluids

Useful in a variety of environments
Advantages
Low pressure loss

No moving parts

Minimal to no sedimentary clogging
Disadvantages
Large in size
(L/D ratio close to 50)


expensive


Alteration restrictions (i.e limit of pressure measurement)
Examples
Orifice Meter
how it works
Experimental vs Typical
Advantages
ease of installation and maintenance

suitable for many fluids

low cost

suitable for pipe range: 1/2" to 36"

simple design

measure both mass and volumetric flow rates

Disadvantages
Accuracy
Options for Orifice meter
may leak and trap gases

gauge taps are required

large pressure drop across the plate

turbulent flow profile

requires homogeneous fluid
indexed markings on meter
Up to 2% of full scale

10:1 turn-down ratio

Up to 1⁄4% of Reading Repeatability

Crude Oil Pipelines
Carburetors
Waste-water and Treatment Plants
pressure difference --> flowrate
Best for measuring gas flow rates

Used for high temperature fluids

Used for high flow rate fluids

Useful for non-homogeneous liquids
pressure recovery is low

high maintenance
glass tube rotameters
metal tube rotameter
plastic tube rotameter
correction factor table:
Retrieved from Matheson: https://www.mathesongas.com/pdfs/products/flowmeter-product-line-overview.pdf
p1
p2
V1
V2
Cocentric Beveled Bore
Restriction Bore
Universal Orifice Plates
Green, D. W., & Perry, H. R. (2008). Perrys Chemical Engineer Handbook. New York : McGraw Hill.
0.68 vs 0.55-0.62
The turndown ratio is 3:1

1%-5% full scale accuracy
3.80E-04
High
Conclusions
High
Q^2
p
Flowmeter Options & Calibration
Full transcript