Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 1: General principles and requirements
1 Scope
This part of GB/T 2624 defines terms and symbols and establishes the general principles for methods of measurement and computation of the flowrate of fluid flowing in a conduit by means of pressure differential devices (orifice plates, nozzles and Venturi tubes) when they are inserted into a circular cross-section conduit running full. This part of GB/T 2624 also specifies the general requirements for methods of measurement, installation and determination of the uncertainty of the measurement of flowrate. It also defines the general specified limits of pipe size and Reynolds number for which these pressure differential devices are to be used.
GB/T 2624 (all parts) is applicable only to flow that remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. It is not applicable to the measurement of pulsating flow.
2 Normative references
The following referenced documents are indispensable for the application of this part of GB/T 2624. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2624.2-2006 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 2: Orifice plates (ISO 5167-2:2003, IDT)
GB/T 2624.3-2006 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 3: Nozzles and Venturi nozzles (ISO 5167-3:2003, IDT)
GB/T 2624.4-2006 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 4: Venturi tubes (ISO 5167-4:2003, IDT)
GB/T 17611-1998 Measurement of fluid flow in closed conduits — Vocabulary and symbols (idt ISO 4006:1991)
3 Terms and definitions
For the purposes of this part of GB/T 2624, the terms and definitions given in GB/T 17611 and the following apply.
NOTE: The following definitions are given only for terms used in some special sense or for terms for which it seems useful to emphasize the meaning.
3.1 Pressure measurement
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and subscripts
5 Principle of the method of measurement and computation
a Flow
6 General requirements for the measurements
7 Installation requirements
8 Uncertainties on the measurement of flowrate
Annex A (informative) Iterative computations
Annex B (informative) Examples of values of the pipe wall uniform equivalent roughness, k
Annex C (informative) Flow conditioners and flow straighteners
Bibliography
