SIST EN 24185:2001/AC:2001
(Amendment)Measurement of liquid flow in closed conduits - Weighing method (ISO 4185:1980)
Measurement of liquid flow in closed conduits - Weighing method (ISO 4185:1980)
Durchflußmessung von Flüssigkeiten in geschlossenen Leitungen - Wägeverfahren (ISO 4185:1980)
Mesure de débit des liquides dans les conduites fermées - Méthode par pesée (ISO 4185:1980)
Merjenje pretoka tekočin v zaprtih vodih - Metoda tehtanja (ISO 4185:1980)
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 24185:2001/AC:2001
01-julij-2001
0HUMHQMHSUHWRNDWHNRþLQY]DSUWLKYRGLK0HWRGDWHKWDQMD ,62
Measurement of liquid flow in closed conduits - Weighing method (ISO 4185:1980)
Durchflußmessung von Flüssigkeiten in geschlossenen Leitungen - Wägeverfahren (ISO
4185:1980)
Mesure de débit des liquides dans les conduites fermées - Méthode par pesée (ISO
4185:1980)
Ta slovenski standard je istoveten z: EN 24185:1993/AC:1993
ICS:
17.120.10 Pretok v zap
...
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This European standard specifies general requirements, minimum performance requirements and test procedures forinstrumentation used to measure either volumetric flow-rate and/or total volume passed of water in closed conduits. It covers all closed conduit instrument (CCI) technologies intended to operate in closed pressurised pipes and partially filled pipes.
It is recognised that for some CCIs certain tests cannot be carried out.
The data obtained from the testing of CCIs in accordance with the requirements of the Measuring Instruments Directive [4] or ISO4064-1 [5] can be used to meet, in part, the requirements specified in this European Standard. However, for the avoidance of doubt,compliance with the requirements of this European Standard does not equate to compliance with the requirements of theMeasuring Instruments Directive or ISO 4064-1.
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This document specifies the geometry and method of use (installation and operating conditions) of
cone meters when they are inserted in a conduit running full to determine the flow rate of the fluid
flowing in the conduit.
As the uncertainty of an uncalibrated cone meter might be too high for a particular application, it might
be deemed essential to calibrate the flow meter in accordance with Clause 7.
This document also provides background information for calculating the flow rate and is applicable in
conjunction with the requirements given in ISO 5167-1.
This document is applicable only to cone meters in which the flow remains subsonic throughout the
measuring section and where the fluid can be considered as single-phase. Uncalibrated cone meters can
only be used within specified limits of pipe size, roughness, β, and Reynolds number, Re. This document
is not applicable to the measurement of pulsating flow. It does not cover the use of uncalibrated cone
meters in pipes sized less than 50 mm or more than 500 mm, or where the pipe Reynolds numbers are
below 8 × 104 or greater than 1,2 × 107.
A cone meter is a primary device which consists of a cone-shaped restriction held concentrically in
the centre of the pipe with the nose of the cone upstream. The design of cone meter defined in this
document has one or more upstream pressure tappings in the wall, and a downstream pressure tapping
positioned in the back face of the cone with the connection to a differential pressure transmitter being
a hole through the cone to the support bar, and then up through the support bar.
Alternative designs of cone meters are available; however, at the time of writing, there is insufficient
data to fully characterize these devices, and therefore, these meters shall be calibrated in accordance
with Clause 7.
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This document specifies the geometry and method of use (installation and operating conditions) of nozzles and Venturi nozzles when they are inserted in a conduit running full to determine the flowrate of the fluid flowing in the conduit.
This document also provides background information for calculating the flowrate and is applicable in conjunction with the requirements given in ISO 5167‑1.
This document is applicable to nozzles and Venturi nozzles in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. In addition, each of the devices can only be used within specified limits of pipe size and Reynolds number. It is not applicable to the measurement of pulsating flow. It does not cover the use of nozzles and Venturi nozzles in pipe sizes less than 50 mm or more than 630 mm, or where the pipe Reynolds numbers are below 10 000.
This document deals with
a) three types of standard nozzles:
ISA 1932[1] nozzle;
the long radius nozzle[2];
the throat-tapped nozzle
b) the Venturi nozzle.
The three types of standard nozzle are fundamentally different and are described separately in this document. The Venturi nozzle has the same upstream face as the ISA 1932 nozzle, but has a divergent section and, therefore, a different location for the downstream pressure tappings, and is described separately. This design has a lower pressure loss than a similar nozzle. For all of these nozzles and for the Venturi nozzle direct calibration experiments have been made, sufficient in number, spread and quality to enable coherent systems of application to be based on their results and coefficients to be given with certain predictable limits of uncertainty.
[1] ISA is the abbreviation for the International Federation of the National Standardizing Associations, which was superseded by ISO in 1946.
[2] The long radius nozzle differs from the ISA 1932 nozzle in shape and in the position of the pressure tappings.
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This document specifies the geometry and method of use (installation and operating conditions) of
wedge meters when they are inserted in a conduit running full to determine the flow rate of the fluid
flowing in the conduit.
NOTE 1 As the uncertainty of an uncalibrated wedge meter can be too large for a particular application, it
could be deemed essential to calibrate the flow meter according to Clause 7.
This document gives requirements for calibration which, if applied, are for use over the calibrated
Reynolds number range. Clause 7 could also be useful guidance for calibration of meters of similar
design but which fall outside the scope of this document.
It also provides background information for calculating the flow rate and is applicable in conjunction
with the requirements given in ISO 5167-1.
This document is applicable only to wedge meters in which the flow remains subsonic throughout the
measuring section and where the fluid can be considered as single-phase. Uncalibrated wedge meters
can only be used within specified limits of pipe size, roughness, β (or wedge ratio) and Reynolds number.
It is not applicable to the measurement of pulsating flow. It does not cover the use of uncalibrated wedge
meters in pipes whose internal diameter is less than 50 mm or more than 600 mm, or where the pipe
Reynolds numbers are below 1 × 104.
NOTE 2 A wedge meter has a primary element which consists of a wedge-shaped restriction of a specific
geometry. Alternative designs of wedge meters are available; however, at the time of writing there is insufficient
data to fully characterize these devices, and therefore these meters are calibrated in accordance with Clause 7.
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This document defines terms and symbols and establishes the general principles for methods of
measurement and computation of the flow rate of fluid flowing in a conduit by means of pressure
differential devices (orifice plates, nozzles, Venturi tubes, cone meters, and wedge meters) when they
are inserted into a circular cross-section conduit running full. This document also specifies the general
requirements for methods of measurement, installation and determination of the uncertainty of the
measurement of flow rate.
ISO 5167 (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.
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This document specifies the geometry and method of use (installation in a system and operating
conditions) of critical flow nozzles (CFNs) used to determine the mass flow rate of a gas flowing through
a system basically without the need to calibrate the CFN. It also gives the information necessary for
calculating the flow rate and its associated uncertainty.
This document is applicable to nozzles in which the gas flow accelerates to the critical velocity at the
minimum flowing section, and only where there is steady flow of single-phase gas. When the critical
velocity is attained in the nozzle, the mass flow rate of the gas flowing through the nozzle is the
maximum possible for the existing inlet condition, while the CFN can only be used within specified
limits, e.g. the CFN throat to inlet diameter ratio and Reynolds number. This document deals with the
toroidal- and cylindrical-throat CFNs for which direct calibration experiments have been made in
sufficient number to enable the resulting coefficients to be used with certain predictable limits of
uncertainty.
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This document specifies the geometry and method of use (installation and operating conditions) of
Venturi tubes1) when they are inserted in a conduit running full to determine the flow rate of the fluid
flowing in the conduit.
This document also provides background information for calculating the flow rate and is applicable in
conjunction with the requirements given in ISO 5167-1.
This document is applicable only to Venturi tubes in which the flow remains subsonic throughout
the measuring section and where the fluid can be considered as single-phase. In addition, Venturi
tubes can only be used uncalibrated in accordance with this standard within specified limits of pipe
size, roughness, diameter ratio and Reynolds number, or alternatively they can be used across their
calibrated range. This document is not applicable to the measurement of pulsating flow. It does not
cover the use of uncalibrated Venturi tubes in pipes sized less than 50 mm or more than 1 200 mm, or
where the pipe Reynolds numbers are below 2 × 105.
This document deals with the three types of classical Venturi tubes:
a) “as cast”;
b) machined;
c) fabricated (also known as “rough-welded sheet-iron”).
A Venturi tube consists of a convergent inlet connected to a cylindrical throat which is in turn connected
to a conical expanding section called the divergent section (or alternatively the diffuser). Venturi
nozzles (and other nozzles) are dealt with in ISO 5167-3.
NOTE In the USA the classical Venturi tube is sometimes called the Herschel Venturi tube.
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