310201f Flow Measurement Fundamentals Flashcards
List for reasons for flow measurement
- Production
- Custody transfer
- Inventory control
- Leak detection
- Process control
Using the correct conversion ratio, convert 3 m³ to the correct US gallon measurement
3 m³ x 264.2 = 792.6 US gal
You are provided with a volumetric flow rate.
What other information do you need to find the mass flow rate?
Fluid density
Describe the flow characteristics of laminar flow
In laminar flow, the motion paths are parallel to the piping.
The particles act like smooth bands that do not mix with one another.
Describe the flow characteristics of turbulent flow
In turbulent flow, the particles move in a very complex random pattern and form vortices (whirling masses) as they mix along the piping in a non parallel flow
When the Reynolds number is less than 2000 you have _________ flow
When the Reynolds number is less than 2000 you have laminar flow
When the Reynolds number is between 2000 and 4000 you have _________ flow
When the Reynolds number is between 2000 and 4000 you have transitional flow
When the Reynolds number is over 4000 you have __________ flow
When the Reynolds number is over 4000 you have turbulent flow
When the Reynolds number is over 10000 you have _____________ flow
When the Reynolds number is over 10000 you have fully developed turbulent flow
The following calculation determines the Reynolds number, identify the components used in this equation.
p = density
v = velocity
D = pipe diameter
u = absolute viscosity
True or false
Pressure has no effect on the Reynolds number
True
A ________ edge orifice plate should be used with low Reynolds numbers.
A quadrant edge orifice plate should be used with low Reynolds numbers.
What is pulsating flow? And what is the most common cause?
A process flow that has irregular or repeating variations in fluid flow rate
Devices such as reciprocating pumps, compressors and positive displacement devices cause pulsating flow.
List 2 ways you can reduce pulsations
- Move the flow meter away from the source of the pulse (farther down the pipe)
- Install filters or other hardware damping devices
Explain one option for managing pressure pulsations when a smart flow transmitter is in use
In the case of smart pressure transmitters, software damping can be used to smooth variations in output readings caused by rapid input changes.
