The industry's most authoritative handbook on flow measurement provides a road map to the field of flow measurement. This best-seller discusses strategies for problem solving and puts the whole array of types of flowmeters at the reader's disposal. The text includes laminar flow elements, critical flowmeters, statistics for measurement, laboratory primary standards, and uncertainty in flow measurement. Emphasis is placed on the importance of accuracy in measurements and ways of ensuring accuracy and avoiding equipment damage through correct forecast of operating conditions, flowmeter selection, installation, calibration, and maintenance. Fundamental considerations such as mixed-phase flow, piping effects, and flow conditioning are examined at length. The problem of attaining a meaningful flow signal through linearization, compensation, and totalization is discussed. Join the thousands of engineers, technicians, managers, and salespeople that have found this reference text an invaluable resource.
TABLE OF CONTENTS Chapter 25 - Flowmeter Selection
A large number of many types of flowmeters are available today. The most commonly
used is the variable differential pressure type, which includes "the orifice
meter," an engineering expression for the thin plate, concentric hole, sharp-edged
orifice plate with its associated transmitter. The use of this flowmeter is so well established
that within some organizations other types of flowmeters will be used
only "when and if the orifice meter is proven not to work." That's one way to select
a flowmeter; however, it is not a method that easily optimizes flowmeter selection.
The variable differential pressure flowmeter is only one type, even though
it is available in many forms:
- Concentric, thin, sharp edged orifice
- Eccentric orifice
- Segmental orifice, and the wedge
- Quadrant and/or conical orifice
- Venturi
- Flow nozzle
- Flow tube
- Pitot
- Averaging Pitot
- Target (annular orifice)
- V-cone
- 90 degree elbow
Other types of flowmeters, without all of their various formats, include the following:
- Constant differential pressure (variable area)
- Displacement (positive and inferential)
- Sonic
- Electromagnetic
- Coriolis
- Thermal types
- Oscillatory (fluidic, vortex precession, and vortex shedding)
 | No one type of flowmeter is suitable and certainly cannot be the optimum choice for every application. A selection process is needed to find which meter is the best solution for a specific measurement problem. |
