GB/T 778.1-2018 PDF English
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Meters for cold potable water and hot water -- Part 1: Metrological requirements and technical requirements
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Measurement of water flow in fully charged closed conduits -- Meters for cold potable water and hot water -- Part 1: Specifications
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Measurement of water flow in closed conduits--Meters for cold potable water--Part 1: Specifications
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Vane wheel type water meters for cold water--Nominal diameter 15mm to 40mm
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GB/T 778.1-2018: PDF in English (GBT 778.1-2018) GB/T 778.1-2018
Meters for cold potable water and hot water--Part 1. Metrological requirements and technical requirements
ICS 91.140.60
N12
National Standards of People's Republic of China
Replace GB/T 778.1-2007
Drinking cold water meter and hot water meter
Part 1. Measurement requirements and technical requirements
Part 1.Metrologicalrequirementsandtechnicalrequirements
(ISO 4064-1.2014, Watermetersforcoldpotablewaterandhotwater-
Part 1. Biological andtechnicalrequirements, IDT)
Published on.2018-06-07
2019-01-01 implementation
State market supervision and administration
China National Standardization Administration issued
Foreword
GB/T 778 "Drinking cold water meter and hot water meter" is divided into the following five parts.
--- Part 1. Measurement requirements and technical requirements;
--- Part 2. Test methods;
--- Part 3. Test report format;
--- Part 4. Non-metering requirements not included in GB/T 778.1;
--- Part 5. Installation requirements.
This part is the first part of GB/T 778.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 778.1-2007 "Measurement of water flow in closed full pipelines. Drinking cold water meter and hot water meter. Part 1
Points. Specification, the main technical changes compared with GB/T 778.1-2007 are as follows.
--- Modified the standard name;
--- Expanded the scope of application of the standard, did not specify the maximum allowable working pressure (see Chapter 1, Chapter 1 of the.2007 edition);
---Adjusted the standard structure;
--- Added the terms "water meter", "rate control device", "preset device", "fixed customer water meter", "plug-in water meter", "plug-in water meter"
Interface "" interchangeable metering module water meter" "interchangeable metering module" "interchangeable metering module water meter connection interface" "error" "resistant
"Permanence" "Measurement conditions" "Resolution of display device" "Multiple water meter conversion flow rate" "Endurance test" "Temperature stability" "Pre-existing
“Environmental adaptation”, “recovery”, “type evaluation” and “type approval” (see 3.1.1, 3.1.9, 3.1.10, 3.1.12, 3.1.20, 3.1.21,
3.1.22, 3.1.23, 3.1.24, 3.2.4, 3.2.10, 3.2.11, 3.2.14, 3.3.6, 3.4.7, 3.4.8, 3.4.9, 3.4.10, 3.4. 11,
3.4.12, 3.4.13);
--- Modified the terms "detection component", "correction device", "initial basic error", "operating temperature", "impact factor", "rated working condition"
Definition of “P-type automatic inspection device” (see 3.1.3, 3.1.7, 3.2.7, 3.3.10, 3.4.2, 3.4.4, 3.5.6,.2007 edition)
3.26, 3.32, 3.49, 3.17, 3.50, 3.5, 3.40);
--- Removed the terms "minimum allowable working pressure" "limit condition" "power supply unit" (see 3.15, 3.6, 3.43 of.2007 edition);
--- Modified the selection of the value of Q3/Q1 (see 4.1.4, 5.1.2 of.2007 edition);
--- Deleted the determination of the reference traffic (see 5.1.5 of the.2007 edition);
--- Increased the classification of the water meter accuracy level, increasing the maximum allowable error requirement of the level 1 table (see 4.2.2);
--- Deleted the "Temperature Level" table reference conditions column (see 5.4.1 of the.2007 edition);
--- Increased the requirements for different flow rates and measurement ranges in both directions of the countercurrent meter (see 4.2.7);
--- Increased the requirement that the water meter does not damage the leak when static pressure is applied (see 4.2.10);
--- Added the requirement for replacement of the battery on the non-replaceable battery, and the minimum service life requirement (see 5.2.3.2);
--- Increased minimum service life requirements for replaceable batteries when the battery is low (see 5.2.4.2);
--- Increased the requirement to replace the battery without damaging the metering seal (see 5.2.4.4);
--- Increased the design of the water meter should be inconvenient to implement fraud, should not be beneficial to either party's requirements (see 6.1.7, 6.1.9);
--- Increased water meter adjustment should not be beneficial to either party's requirements (see 6.2.1);
--- Increased the requirements for water meter installation conditions (see 6.3);
--- Increased the requirement for accuracy grade and pressure loss grade on the nameplate (see 6.6.2);
--- Removed the requirement on the nameplate for the type of output signal provided to the auxiliary device (see 6.8 of the.2007 edition);
--- Revised to provide environmental rating and electromagnetic compatibility rating only on nameplates with electronic water meters (see 6.6.2,.2007 edition)
6.8);
--- Increased display requirements for electronic pointing devices (see 6.7.2.2);
--- Increased the resolution requirements for the indicating device of the Class 1 water meter (see 6.7.3.2.3);
--- Increased the requirements for dual water meter indicating devices (see 6.7.3.3);
--- Removed the requirement for additional verification components (see 6.6.3.3 of the.2007 edition);
--- Increased measurement control content, including type testing and first verification requirements (see Chapter 7);
--- Removed Appendix A and Appendix B of the.2007 edition;
--- Added an appendix to the "Performance Test for Water Meters with Electronic Devices" (see Appendix A);
--- Added "Approval Errors in Use and Subsequent Verification" appendix (see Appendix C).
This section uses the translation method equivalent to ISO 4064-1.2014 "Drinking cold water meters and hot water meters - Part 1. Metrology and technology
Claim".
This standard has made the following editorial changes.
--- Modified the standard name.
This part was proposed by the China Machinery Industry Federation.
This part is under the jurisdiction of the National Industrial Process Measurement Control and Automation Standardization Technical Committee (SAC/TC124).
This section drafted by. Shanghai Industrial Automation Instrumentation Research Institute Co., Ltd., Ningbo Water Meter Co., Ltd., Sanchuan Smart Technology Unit
Co., Ltd., Ningbo Donghai Instrument Waterway Co., Ltd., Suzhou Waterworks Co., Ltd., Zhejiang Institute of Metrology, Henan Province
Institute of Scientific Research, Ningbo Metrology and Testing Institute, Nanjing Water Group Co., Ltd. Water Meter Factory, Chongqing Smart Water Co., Ltd., Wuxi Water
Table limited liability company, Shanghai Water Meter Factory, Shanghai Instrumentation Automatic Control System Inspection and Testing Institute, Hangzhou Water Meter Co., Ltd., Shenzhen Jiexian Digital
Technology Co., Ltd., Huizhong Instrument Co., Ltd., Fuzhou Kerong Instrument Co., Ltd., Yangzhou Hengxin Instrument Co., Ltd., Beijing
Lai Shui Group Jingzhao Water Meter Co., Ltd., Jinan Ruiquan Electronics Co., Ltd., Hangzhou Jingda Electronics Co., Ltd., Jiangyin Lixin Intelligent Design
Preparation Co., Ltd., Hunan Changde Water Meter Manufacturing Co., Ltd., Ningbo Jingcheng Technology Co., Ltd., Hunan Weiming Energy Technology Co., Ltd.
Division, Qingdao Jicheng Electronics Co., Ltd., Tianjin Sain Energy Technology Co., Ltd.
The main drafters of this section. Li Minghua, Zhao Shaoman, Song Caihua, Lin Zhiliang, Yao Fujiang, Zhao Jianliang, Cui Yaohua, Ma Jun, Lu Congwen,
Wei Qinghua, Zhang Qing, Chen Yu, Xie Jianliang, Chen Jian, Zhang Jichuan, Chen Hanzhang, Zhang Jian, Zhang Wenjiang, Dong Liangcheng, Du Jiquan, Han Lu, Zhu Zhengjian,
Tang Tianshun, Liao Jie, Zhang Dexia, Zuo Wei, Wang Jianing, Song Yanyong, Wang Xinxin, Wang Qinli.
The previous versions of the standards replaced by this section are.
---GB 778-1984;
---GB/T 778.1-1996, GB/T 778.1-2007.
Drinking cold water meter and hot water meter
Part 1. Measurement requirements and technical requirements
1 Scope
This part of GB/T 778 specifies a drinking cold water meter that measures the flow of water in a closed full pipe and is equipped with a cumulative flow indicating device.
The measurement requirements and technical requirements of hot water meters.
This section applies to both water-based and mechanical-based water meters, as well as based on electrical or electronic principles and based on mechanical principles,
A water meter used to measure the volumetric flow of drinking cold water and hot water.
This section also applies to electronic aids that are usually available as an option. However, national regulations may stipulate that certain options are water meters.
Essential aids.
Note. National regulations are higher than the provisions of this section.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
Drinking cold water and hot water meters - Part 2. Test methods (ISO 4064-2.2014, IDT)
3 Terms and definitions
The following terms and definitions apply to this document.
Note. These terms are the same as in ISO /IEC Guide 99.2007/OIMLV2-200.2012[1], OIMLV1.2013[2] and OIMLD11[3], listed here.
Certain terms modify the definition of ISO /IEC Guide 99.2007/OIMLV2-200.2012 and OIMLD11.
3.1 Water meter and its components
3.1.1
Water meter watermeter
A meter for continuously measuring, recording, and displaying the volume of water flowing through a measurement sensor under measurement conditions.
Note 1. The water meter includes at least a measuring sensor, a calculator (including adjustment and correction devices), and a pointing device. The three can be placed in different enclosures.
Note 2. The water meter can be a double water meter (see 3.1.16).
3.1.2
Measuring sensor measurementtransducer
The water meter converts the measured water flow or water volume into a component that sends a signal to the calculator, which contains the sensing element.
Note. Measurement sensors can be based on mechanical principles, electrical principles or electronic principles, and can be self-excited or use an external power source.
3.1.3
Detection element sensor
A component of a water meter that is directly affected by a phenomenon, medium, or object that is being measured.
Note 1. Rewrite ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), definition 3.8. Change the "measurement system" to "water meter".
Note 2. The detection elements of the water meter can be discs, pistons, gears, turbines, electrodes in electromagnetic water meters or other components. Water flow through the water meter is detected in the water meter
The quantity or volume of water is referred to as a "flow detecting element" or a "volume detecting element."
3.1.4
Calculator calculator
A water meter component that receives the output signal of a measurement sensor or associated measurement instrument and converts it into a measurement result. If conditions permit,
Measurement results can also be stored in memory before they are used.
Note 1. The gear transmission in the mechanical water meter can be regarded as a calculator.
Note 2. The calculator can also communicate bidirectionally with the auxiliary device.
3.1.5
Indicating device
A water meter component that corresponds to the indicated volume of water flowing through the water meter is given.
Note. The term “indicative value” is defined in ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), 4.1.
3.1.6
Adjustment device adjustmentdevice
The water meter can be adjusted in the water meter to make the error curve of the water meter parallel to the device within the maximum allowable error range.
Note. The term “measurement system adjustment” is defined in ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), 3.11.
3.1.7
Correction device correctiondevice
Connected or installed in a water meter, automatically under the measurement conditions based on the flow rate and/or characteristics of the water being measured and a predetermined calibration curve
A device that corrects the volume.
Note 1. The characteristics of the water to be measured (such as temperature and pressure) can be measured with the relevant measuring instrument or stored in the instrument's memory.
Note 2. The definition of the term “correction” can be found in ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), 2.53.
3.1.8
Auxiliary device
A device that performs a specific function and is directly involved in generating, transmitting, or displaying measured values.
Note 1. The definition of “measured value” can be found in ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), 2.10.
Note 2. There are mainly the following auxiliary devices.
a) zero adjustment device;
b) price indicating device;
c) repeating the indicating device;
d) printing device;
e) storage device;
f) rate control device;
g) a preset device;
h) self-service devices;
i) a flow detecting element moving detector (detecting the movement of the flow detecting element before the indicating device is displayed);
j) Remote meter reading device (can be installed permanently or temporarily).
Note 3. According to national laws and regulations, auxiliary devices may be subject to legal measurement management.
3.1.9
Rate control device
A device that assigns measured values to different registers according to rates or other criteria. Each register can be read separately.
3.1.10
Preset device pre-settingdevice
A device that allows the selection of water usage and automatically stops the flow of water after the selected amount of water has been measured.
3.1.11
Related measuring instrument associatedmeasuringinstruments
A meter attached to a calculator or correction device for measuring a certain amount of water for correction and/or conversion.
3.1.12
Fixed customer water meter meterfortwoconstantpartners
Only for a fixed installation of water meters that a supplier supplies to a customer.
3.1.13
Pipeline water meter in-linemeter
A water meter that accesses a closed pipe using a connector at the end of the water meter.
Note. The end connector can be flanged or threaded.
3.1.14
Integral water meter completemeter
Measuring instruments, calculators, and water meters that are inseparable from the pointing device.
3.1.15
Split type water meter combinedmeter
A water meter that separates the measuring sensor, calculator, and pointing device.
3.1.16
Duplex water meter combinationmeter
A water meter consisting of a large water meter, a small water meter and a conversion device. The conversion device according to the flow rate flowing through the water meter
Automatically directs water flow through a small or large water meter, or both water meters.
Note. The reading of the water meter is read from two independent totalizers, or the total flow value of the two water meters is added by an accumulator.
3.1.17
Test equipment equipmentundertest; EUT
A complete water meter, water meter assembly or auxiliary device that is tested.
3.1.18
Coaxial water meter concentricmeter
A water meter that uses a manifold to access a closed conduit.
Note. The inlet and outlet channels of the water meter and manifold are coaxial at the junction between the two.
3.1.19
Coaxial water meter collection tube concentricmetermanifold
Special connection pipe fittings for coaxial water meters.
3.1.20
Cartridge water meter cartridgemeter
A water meter that accesses a closed conduit using a transition piece called a connection interface.
Note. The inlet and outlet channels of the water meter and connection interface are coaxial or axial. See GB/T 778.4 for details.
3.1.21
Cartridge water meter connection interface cartridgemeterconnectioninterface
Special connection fittings for coaxial or axial cartridge water meters.
3.1.22
Interchangeable metering module water meter meterwithexchangeablemetrologicalmodule
The common flow rate is above 16m3/h, which consists of a connection interface and a metering module. The metering module can be used with other models of the same model.
Block interchangeable water meters.
3.1.23
Interchangeable metering module exchageablemetrologicalmodule
A separate module consisting of a measuring sensor, a calculator and a pointing device.
3.1.24
Interchangeable metering module water meter connection interface connectioninterfaceformeterswithexchangeablemetrological
Modules
Special connection fittings for interchangeable metering modules.
3.2 Measurement characteristics
3.2.1
Actual volume actualvolume
Va
The total volume of water flowing through the water meter at any time.
Note 1. This is measured.
Note 2. The actual volume is calculated from the reference volume. The reference volume is determined by using appropriate measurement standards in consideration of various measurement conditions.
Fixed.
3.2.2
Indicate volume indicatedvolume
Vi
Corresponds to the actual volume, the volume of water displayed by the water meter.
3.2.3
Main indication value primaryindication
The value of the legal system management.
3.2.4
Error error
The measured value is subtracted from the reference value.
[ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), Definition 2.16]
Note 1. For this part, the indicated volume is the measured value and the actual volume is the reference value. The difference between the indicated volume and the actual volume is. (indicator) error.
Note 2. In this section, the (indicator) error is expressed as a percentage of the actual volume, ie.
(Vi-Va)/Va×100%
3.2.5
Maximum allowable error maximumpermissibleerror; MPE
The limit value of the measurement error relative to the known reference magnitude, as permitted by the specification or procedure of the water meter.
Note. Modify ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), definition 4.26. Replace “measurement, measuring instrument or measuring system” with “water meter”
System."
3.2.6
Basic error intrinsicerror
The error of the water meter determined under the reference conditions.
Note. Modify OIMLD11.2013, definition 3.8. Replace the “measurement meter” with “water meter”.
3.2.7
Initial basic error initialintrinsicerror
The basic error of the water meter determined prior to the performance test and durability evaluation test.
Note. Modify OIMLD11.2013, definition 3.9. Replace the “measurement meter” with “water meter”.
3.2.8
Error fault
The difference between the (indicative) error of the water meter and the basic error.
Note. Modify OIMLD11.2013, definition 3.10. “Indicative value” is placed in parentheses; “water meter” is used instead of “measurement meter”.
3.2.9
Obvious error significantfault
An error greater than the value specified in GB/T 778.1.
Note 1. Modify OIMLD11.2013, definition 3.12. Replace “related international recommendations” with “GB/T 778.1”.
Note 2. The specified value is given in 5.1.2.
3.2.10
Durability
The ability of a water meter to maintain its performance characteristics after a period of use.
Note. Modify OIMLD11.2013, definition 3.18. Replace the “measurement meter” with “water meter”.
3.2.11
Measuring condition
The conditions of the water to be measured at the measurement point (for example, water temperature, water pressure, etc.).
3.2.12
Indicating device primary element firstelementoftheindictingdevice
An indicator device consisting of a plurality of components is provided with an element for calibrating the scale division scale.
3.2.13
Verification scale division verificationscaleinterval
Indicates the minimum index of the primary component of the device.
3.2.14
Display resolution of the device resolutionofandisplayingdevice
The minimum difference that can be effectively resolved between the displayed values.
[ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), Definition 4.15]
Note. For digital pointing devices, this term refers to the amount of change in the indication that indicates a change in the least significant digit of the device.
3.3 Working conditions
3.3.1
Flow rate
Q = dV/dt, where V is the actual volume and t is the time it takes for the volume to flow through the meter.
Note. 4.1.2 of ISO 4006.1991 [5] uses the symbol qV to indicate flow, but this part is expressed by Q according to industry practice.
3.3.2
Common traffic permanentflowrate
Q3
The maximum flow rate of the water meter in accordance with the maximum allowable error under rated working conditions.
Note. In this section, the flow unit is m3/h, see 4.1.3.
3.3.3
Overload flow overloadflowrate
Q4
The water meter is required to meet the maximum allowable error requirement in a short time, and then the maximum metering characteristic can be maintained under the rated working conditions.
flow.
3.3.4
Demarcation flow transitionalflowrate
Q2
Appear between the common traffic and the minimum traffic, and divide the traffic range into "high zone" and "low zone" each with a specific maximum allowable error.
Traffic in the district.
3.3.5
Minimum flow minimumflowrate
Q1
The water meter meets the minimum flow rate required by the maximum allowable error.
3.3.6
Duplex water meter conversion flow combinationmeterchangeoverflowrate
Qx
As the flow rate decreases, the flow rate Qx1 when the large water meter stops working, or the flow rate Qx2 when the large water meter starts to work as the flow rate increases.
3.3.7
Minimum allowable temperature minimumadmissibletemperature; mAT
Under the rated working conditions, the water meter can last for a long time and the metering performance will not deteriorate.
Note. mAT is the lower limit of the rated operating temperature.
3.3.8
Maximum allowable temperature maximumadmissibletemperature; MAT
Under the rated working conditions, the water meter can last for a long time and the metering performance will not deteriorate.
Note. MAT is the upper limit of the rated operating temperature.
3.3.9
Maximum allowable pressure maximumadmissiblepressure; MAP
The highest internal pressure that the water meter can withstand for a long time and the metering performance does not deteriorate under rated working conditions.
3.3.10
Working temperature workingtemperature
Tw
The temperature of the water in the pipe measured upstream of the water meter.
3.3.11
Working pressure workingpressure
Pw
The average water pressure (gauge pressure) in the pipe measured upstream and downstream of the water meter.
3.3.12
Pressure loss
Δp
At a given flow rate, there is an unrecoverable pressure drop caused by the presence of a water meter in the pipeline.
3.3.13
Test flow testflowrate
The average flow rate at the time of the test calculated from the indicated values of the calibrated reference device.
3.3.14
Nominal diameter nominaldiameter; DN
An alphanumeric symbol for the pipe size in the piping system for reference.
Note 1. The nominal diameter is indicated by the letter DN followed by a dimensionless integer, which indirectly represents the actual size of the inner or outer diameter of the joint in millimeters.
Note 2. The number after the DN does not represent a measurable value and should not be used for calculation unless specified in the relevant standards.
Note 3. The standard using the DN notation should describe the relationship between the DN and the pipe size, such as DN/OD or DN/ID.
3.4 Test conditions
3.4.1
Influence quantity
In the direct measurement process, it does not affect the amount actually measured, but affects the relationship between the indication and the measurement result.
[ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), Definition 2.52]
Example.
The ambient temperature of the water meter is the amount of influence, and the temperature effect of the water flowing through the water meter is measured, not the amount of influence.
3.4.2
Impact factor
The value of the influence is within the range of the rated working conditions of the water meter specified in GB/T 778.1.
Note. Modify OIMLD11.2013, definition 3.15.1. Replace “measurement instrument” with “water meter”; replace “related international recommendations” with “GB/T 778.1”.
3.4.3
Disturbance disturbance
Its value is within the limits specified in GB/T 778.1 but exceeds the influence of the rated working conditions of the water meter.
Note 1. Modify OIMLD11.2013, definition 3.15.2. Replace “related international recommendations” with “GB/T 778.1”; replace “measurement meters” with “water meters”.
Note 2. If a certain amount of influence is not specified in the rated workpiece condition, the amount of influence is a disturbance.
3.4.4
Rated working conditions ratedoperatingconditions; ROC
In order to make the water meter work according to the design performance, the working conditions that need to be met during the measurement.
Note 1. Amend the ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), definition 4.9. Replace “necessary satisfaction” with “need to meet”; use “water meter”
Instead of "measuring instrument or measuring system".
Note 2. The rated working conditions stipulate the range of flow and influence quantities, and the (indicative) error of the water meter should be within the maximum allowable error range.
3.4.5
Reference condition referenceconditions
Operating conditions specified to evaluate the performance of the water meter or to compare multiple measurements.
Note. Modify ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), definition 4.11. Replace “measurement or measurement system” with “water meter”.
3.4.6
Performance test
Verify that the device under test is capable of performing its intended function.
[OIMLD11.2013, definition 3.21.4]
3.4.7
Durability test
Verify that the device under test can maintain its performance characteristics for a long time after a period of use.
[OIMLD11.2013, definition 3.21.5]
3.4.8
Temperature stability
The temperature difference between the components of the device under test (EUT) does not exceed 3 ° C, or the conditions specified in the relevant specifications for the final temperature.
3.4.9
Preconditioning
The device under test (EUT) is processed to eliminate or partially offset early effects.
Note. Pretreatment is the first step in the entire test process when pretreatment is required.
3.4.10
Environmental adaptation
The device under test (EUT) is placed under certain environmental conditions (impact factors and disturbances) to determine the effect of this condition.
3.4.11
Recovery recovery
After the environment is adapted, the device under test is processed to stabilize its performance before measurement.
3.4.12
Type evaluation typeevaluation; patternevaluation
Systematic inspection and testing of the performance of one or several water meters of a specified type of measuring instrument according to the requirements of the document, and writing the results
Enter the evaluation report to determine if the type is approved.
Note 1. The term “patternevaluation” is used for statutory measurement and has the same meaning as “typeevaluation”.
Note 2. Modify OIMLV1.2013, define 2.04. Replace the "type(pattern) with the synonyms terms......
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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