flow measurement Flashcards
An _____ is a primary flow element consisting of a thin circular metal plate with a sharp-edged round hole in it
Oriface plate
An _____ is the tubing or piping connection that connects flowmeter taps to any differential pressure instrument
Impulse line
what two forces are always present in a closed pipe?
Static head due to pressure
Static head due to elevation
When steam flow is measured, the measuring instrument must be located _____ the flow element
Below
Venturi tubes, orfice plates, and flow nozzles measure what?
Flow
_____ is the ratio of maximum flow to minimum flow at the desired measurement
Rangeability
When liquid flow is measured, the presence of _____ in impulse lines ruins accuracy
Air bubbles
A _____ valve is a valve used at a differential measuring instrument to equalize pressure in a differential instrument
Blocking
Pressure sensing taps are located _____ and _____ from a flow nozzle
Upstream
Downstream
When can flow measurement become inaccurate?
When flowing conditions change from when the system was designed
A _____ tube is a primary flow element consisting of an aerodynamic internal cross section with the low pressure connection at the throat
Low Loss
A _____ is a pressure connection
Tap
A _____ is a primary flow element consisting of a fabricated pipe section with a converging inlet section, a straight throat, and a diverging outlet section
Venturi tube
A _____ is a small metal or plastic rotameter with an adjustable valve at the inlet or outlet of the meter to control the flow rate of the purge fluid
Purge Meter
A _____ meter is a mechanical flowmeter consisting of turbine blades mounted on a wheel that measure the velocity of a liquid steam by counting the pulses produced by the blades as they pass an electromagnet pickup
Turbine
