JJG 162-2009 English PDF (JJG162-2009)

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JJG 162-2009: Verification Regulation of Cold Water Meter
JJG 162-2009
JJG
NATIONAL METERING AND CALIBRATION REGULATION
OF THE PEOPLE’S REPUBLIC OF CHINA
Cold water meter
冷水水表
ISSUED ON: APRIL 08, 2009
IMPLEMENTED ON: APRIL 30, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine
Table of Contents
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and units of measurement ... 6 
3.1 Water meter and its composition ... 6 
3.2 Metering characteristics ... 9 
3.3 Operating conditions ... 10 
3.4 Test conditions ... 12 
3.5 Electronic devices and electrical devices ... 13 
3.6 Unit of measurement ... 14 
4 Overview ... 14 
4.1 Principle and structure... 14 
4.2 Classification ... 15 
5 Measurement performance requirements ... 15 
5.1 Q1, Q2, Q3, Q4 value... 15 
5.2 Accuracy level and maximum permissible error ... 16 
6 General technical requirements ... 18 
6.1 Material and structure... 18 
6.2 Adjustment and correction ... 19 
6.3 Installation conditions ... 19 
6.4 Rated working conditions ... 19 
6.5 Marking and nameplate ... 20 
6.6 Indicating device ... 21 
6.7 Verification marks and protective devices ... 24 
6.8 Tightness ... 25 
6.9 Other requirements for water meters with electronic devices ... 25 
6.10 Ancillary device ... 26 
7 Control of measuring instrument ... 26 
7.1 Verification conditions ... 27 
7.2 Verification items ... 29 
7.3 Verification method ... 29 
7.4 Processing of verification results ... 35 
7.5 Verification cycle ... 35 
Appendix A Type evaluation outline of cold water meter ... 36 
Appendix B Type evaluation check and test list ... 102 
Appendix C The role of checking facility ... 119 
Appendix D Type evaluation of series water meters ... 124 
Appendix E Installation requirements for flow interference test ... 126 
Appendix F Reference format of verification record ... 127 
Appendix G Verification flow and water consumption reference value of some
water meters ... 128 
Appendix H Format of verification certificate and verification result notification
(inner page) ... 130 
Verification regulation of cold water meter
This regulation, referring to the international recommendation OIML R49-
1:2006 (E) "Water meters for measuring drinkable cold and hot water - Part 1:
Measurement and technical requirements", OIML R49-2:2006 (E) "Water
meters for measuring drinkable cold water and hot water - Part 2: Test methods",
combined with the current situation of the Chinese industry, added and deleted
some content.
1 Scope
This regulation is applicable to the type evaluation, first verification, subsequent
verification and in-use inspection of cold water meters.
The cold water meter referred to in this regulation is a water meter that
measures clean cold water flowing through a closed pipe and has a temperature
of T30 or T50, including mechanical water meters, mechanical water meters
equipped with electronic devices, water meters based on electromagnetic or
electronic principles.
2 Normative references
The following documents are cited in this regulation:
GB/T 778.1-2007 Measurement of water flow in fully charged closed
conduits - Meters for cold potable water and hot water - Part 1: Specifications
GB/T 778.2-2007 Measurement of water flow in fully charged closed
conduits - Meters for cold potable water and hot water - Part 2: Installation
requirements
GB/T 778.3-2007 Measurement of water flow in fully charged closed
conduits - Meters for cold potable water and hot water - Part 3: Test methods
and equipment
OIML R49-1:2006 (E) Water meters intended for the metering of cold potable
water and hot water. Part 1: Metrological and technical requirements
OIML R49-1:2006 (E) Water meters intended for the metering of cold potable
water and hot water. Part 2: Test methods
OIML D11:2004 (E) General requirements for electronic measuring
of a number of metering chambers of known volume that are successively filled
and discharged with water and a mechanism driven by flow.
3.1.12 Velocity meter
A mechanical water meter which is installed in a closed pipeline and composed
of moving element driven by the speed of water flow.
3.1.13 Woltmann meter
A velocity meter consisting of a wing rotor rotating around the flow axis.
3.1.14 Single-jet meter and multiple-jet meter
A velocity meter consisting of a turbine rotor rotating around an axis
perpendicular to the water flow. If a single stream impinges on a certain part of
the edge of the rotor, it is called a single-jet meter; if multiple streams impinge
on a certain part of the edge of the rotor at the same time, it is called a multiple-
jet meter.
3.1.15 In-line meter
The water meter which is directly installed in the closed pipeline by using the
connecting thread or flange at the end of the water meter.
3.1.16 Combination meter
A water meter composed of a large water meter, a small water meter, a
conversion device; the water flow automatically flows through the small water
meter or the large water meter, or flows through both meters at the same time
according to the flowrate. The reading of the water meter is given by two
independent calculators, or given by a calculator after adding the values on the
two water meters.
3.1.17 Concentric meter
A water meter that can be connected to the pipeline with a collecting pipe. At
the contact surface, the inlet, outlet and collecting pipe, the water meter is
coaxial. The collecting pipe is a special connecting pipe for concentric meters.
3.1.18 Water meters equipped with electronic devices
A water meter equipped with electronic devices to achieve predetermined
functions. Water meters with electronic devices include mechanical water
meters equipped with electronic devices and water meters based on
electromagnetic or electronic principles. The electronic device includes a flow
signal conversion and processing unit, meanwhile it may be added with storage
memory devices, presetting devices, price display devices, etc.
high zone.
The following are not considered to be significant faults:
a) Fault caused by simultaneous and independent causes in the water meter
itself or its checking facility;
b) Temporary fault, manifested as an instant indication change that cannot
be interpreted, stored or transmitted as a measurement result.
3.2.11 Durability
The ability of the water meter to maintain its performance characteristics after
a period of use.
3.2.12 Metering conditions
When measuring water volume, the conditions of the water at the measuring
point (such as water temperature and water pressure).
3.2.13 First element of an indicating device
The graduated ruler element with verification scale interval as equipped in an
indicating device which is composed of several elements.
3.2.14 Verification scale interval
The smallest division of the first element of an indicating device.
3.2.15 Resolution (of an indicating device)
The smallest difference between the indicating values that can be effectively
distinguished in the indicating device.
Note: For digital devices, the resolution is the amount of change when the
minimum effective number of the indicating device changes by one step.
3.3 Operating conditions
3.3.1 Flowrate Q
The quotient of the actual volume through the water meter and the time used.
3.3.2 Permanent flowrate Q3
Maximum flowrate under rated operating conditions. At this flowrate, th...