GB/T 778.1-2018 PDF English
US$150.00 · In stock · Download in 9 secondsGB/T 778.1-2018: Meters for cold potable water and hot water -- Part 1: Metrological requirements and technical requirements Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 778.1: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 778.1-2018 | English | 150 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Meters for cold potable water and hot water -- Part 1: Metrological requirements and technical requirements
| Valid |
| GB/T 778.1-2007 | English | 440 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Measurement of water flow in fully charged closed conduits -- Meters for cold potable water and hot water -- Part 1: Specifications
| Obsolete |
| GB/T 778.1-1996 | English | 135 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Measurement of water flow in closed conduits--Meters for cold potable water--Part 1: Specifications
| Obsolete |
| GB 778-1984 | English | 799 |
Add to Cart
|
5 days
|
Vane wheel type water meters for cold water--Nominal diameter 15mm to 40mm
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 778.1-2018
GB/T 778.1-2018: Meters for cold potable water and hot water -- Part 1: Metrological requirements and technical requirements
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT778.1-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.140.60
N 12
GB/T 778.1-2018 / ISO 4064-1.2014
Replacing GB/T 778.1-2007
Meters for cold potable water and hot water – Part 1.
Metrological requirements and technical requirements
(ISO 4064-1.2014, Water meters for cold potable water and hot water -
Part 1.Metrological and technical requirements, IDT)
Issued on. JUNE 7, 2018
Implemented on. JANUARY 1, 2019
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword... 3
1 Scope... 7
2 Normative references... 7
3 Terms and definitions... 7
4 Metrological requirements... 23
5 Water meters equipped with electronic devices... 28
6 Technical requirements... 30
7 Metrological controls... 40
Annex A (Normative) Performance tests for water meters with electronic
devices... 49
Annex B (Normative) Checking facilities... 52
Annex C (Informative) Permissible errors in service and subsequent
verification... 57
Bibliography... 58
Foreword
GB/T 778, Meters for cold potable water and hot water, consists of 5 parts.
— Part 1.Metrological and technical requirements;
— Part 2.Test methods;
— Part 3.Test report format;
— Part 4.Non-metrological requirements not covered in GB/T 778.1;
— Part 5.Installation requirements.
This Part is Part 1 of GB/T 778.
This Part was 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 fully charged
closed conduits – Meters for cold potable water and hot water – Part 1.Specifications.
Compared with GB/T 778.1-2007, its major technical changes are as follows.
— it changes the standard name;
— it extends the applicable scope of the standard, without specifying maximum
admissible working pressure (see Clause 1; Clause 1 of 2007 edition);
— it adjusts the structure of the standard;
— it adds the terms, including “water meter”, “tariff control device”, “pre-setting
device”, “meter for two constant partners”, “cartridge meter”, “cartridge meter
connection interface”, “meter with exchangeable metrological module”,
“exchangeable metrological module”, “connection interface for meters with
exchangeable metrological modules”, “error”, “durability”, “metering conditions”,
“resolution of a displaying device”, “combination meter changeover flow rate”,
“durability test”, “temperature stability”, “preconditioning”, “conditioning”,
“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);
— it modifies the terms including “flow sensor”, “correction device”, “initial intrinsic
error”, “working temperature”, “influence factor”, “rated operating condition”,
“type P automatic checking facility” (see 3.1.3, 3.1.7, 3.2.7, 3.3.10, 3.4.2, 3.4.4
and 3.5.6; 3.26, 3.32, 3.49, 3.17, 3.50, 3.5 and 3.40 of 2007 edition);
— it deletes the definitions of the terms including “minimum admissible working
pressure”, “limiting conditions” and “power supply device” (see 3.15, 3.6 and 3.43
of 2007 edition);
— it modifies the selection of the value of Q3/Q1 (see 4.1.4; 5.1.2 of 2007 edition);
— it deletes the determination of reference flow (see 5.1.5 of 2007 edition);
— it adds the classification of water meter accuracy classes and adds the maximum
permissible error requirements for class 1 meters (see 4.2.2);
— it deletes the column of reference conditions in the table of “temperature classes”
(see 5.4.1 of 2007 edition);
— it adds different requirements for permanent flow and measuring range in two
directions of reverse flow water meters (see 4.2.7);
— it adds the requirement that water meters are capable of withstanding static
pressure without damage or leakage (see 4.2.10);
— it adds the requirement that for a replaceable battery, a low battery or exhausted
battery indicator or a meter replacement date shall be indicated on the meter
(see 5.2.3.2);
— it adds the requirement that, for a replaceable battery, if the register display gives
an indication of “low battery”, there shall be a minimum useful life for the register
display from the time “low battery” indication is displayed to end of life (5.2.4.2);
— it adds the requirement that Replacement of the battery shall be carried out in a
way that does not necessitate breaking the seal required for statutory
metrological inspections (5.2.4.4);
— it adds the requirement that a water meter shall be of such design, composition,
and construction that it does not facilitate the perpetration of fraud and that it
does not exploit the MPE or favour any party (see 6.1.7 and 6.1.9);
— it adds the requirement that the adjustment of the meter may not exploit the MPE
or systematically favour any party (see 6.2.1);
— it adds the requirements for meter installation conditions (see 6.3);
— it adds the requirements for accuracy classes and pressure loss classes on the
nameplate (see 6.6.2);
— it deletes the requirements for the types of output signals provided for auxiliary
devices on the nameplate (see 6.8 of 2007 edition);
— it is modified that it requires provision of environmental classes and
electromagnetic compatibility only on the nameplate of water meters with
electronic devices (see 6.6.2; 2007 edition);
— it adds the display requirements for electronic indication devices (see 6.7.2.2);
— it adds the requirements for resolution of the indicating device of class 1 water
meters (see 6.7.3.2.3);
— it adds the requirements for the indicating device of combination water meters
(see 6.7.3.3);
— it deletes the requirements for additional verification elements (see 6.6.3.3 of
2007 edition);
— it adds the requirements for metrological controls, including type test and initial
verification (see Clause 7);
— it deletes Annexes A and B to 2007 edition;
— it adds the annex “Performance tests for water meters with electronic devices”
(see Annex A);
— it adds the annex “Permissible errors in service and subsequent verification” (see
Annex C).
This Part identically adopts ISO 4064-1.2014, Water meters for cold potable water and
hot water – Part 1.Metrological and technical requirements, using the translation
method.
The following editorial modifications are made in this Standard.
— the standard name is modified.
This Part was proposed by the China Machinery Industry Federation.
This Part shall be under the jurisdiction of National Technical Committee 124 on
Industrial Process Measurement, Control and Automation of Standardization
Administration of China (SAC/TC 124).
The drafting organizations of this Part. Shanghai Institute of Process Automation and
Instrumentation Co., Ltd., Ningbo Water Meter Co., Ltd., Sanchuan Wisdom
Technology Co., Ltd., Ningbo Donghai Instruments and Water channels Co., Ltd.,
Suzhou Water Meter Co., Ltd., Zhejiang Institute of Metrology, Henan Institute of
Metrology, Ningbo Institute of Measurement and Testing, Nanjing Tap Water General
Company Water Meter Factory, Chongqing Intelligent Water Meter Co., Ltd., Wuxi
Water Meter Co., Ltd., Shanghai Water Meter Co., Ltd., Shanghai Inspection and
Testing Institute of Instruments and Automation Systems, Hangzhou Water Meter Co.,
Ltd., Shenzhen Jiexian Digital Technology Co., Ltd., Huizhong Instrumentation Co.,
Ltd., Fuzhou Kerong Instrument Co., Ltd., Yangzhou Hengxin Instrument Co., Ltd.,
Beijing Waterworks Group Jingzhao Water Meter Co., Ltd., Jinan Richens Electronic
Co., Ltd., Hangzhou Jingda Electronic Co., Ltd., Jiangyin Lixin Intelligent Device Co.,
Ltd., Hunan Changde Water Meter Manufacture Co., Ltd., Ningbo Jingcheng
Technology Co., Ltd., Hunan Weiming Energy Technology Co., Ltd., Qingdao IESLab
Electronic Co., Ltd., Tianjing New Sun Energy Technology Co., Ltd.
The main drafters of this Part. Li Minghua, Zhao Shaoman, Song Caihua, Lin Zhiliang,
Yao Fujiang, Zhao Jianliang, Cui Yaohua, Ma Jun, Lu Congwen, Wei Qinghua, Zhang
Qing, Chen Zhengrong, 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 Ye, Wang Jianing, Song Yanyong, Wang
Xinxin, Wang Qinli.
The previous editions of the standard replaced by this Part are as follows.
— GB/T 778-1984;
— GB/T 778.1-1996, GB/T 778.1-2007.
Meters for cold potable water and hot water – Part 1.
Metrological requirements and technical requirements
1 Scope
This Part of GB/T 778 specifies the metrological and technical requirements for water
meters for cold potable water and hot water flowing through a fully charged, closed
conduit. These water meters incorporate devices which indicate the integrated volume.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to this document.
3 Terms and definitions
For the purposes of this document, the following definitions apply.
part of the meter that transforms the flow rate or volume of water to be measured into
signals which are passed to the calculator and includes the sensor
4 Metrological requirements
A water meter shall be designed and manufactured such that its errors (of indication)
do not exceed the maximum permissible errors (MPEs) as defined in 4.2.2 or 4.2.3
under rated operating conditions.
The meters fall under water temperature classes corresponding to the various ranges,
chosen by the manufacturer from the values given in Table 1.
5 Water meters equipped with electronic devices
All water meters equipped with checking facilities shall prevent or detect reverse flow,
as specified in 4.2.7.
Replacement of the battery shall be carried out in a way that does not
necessitate breaking the seal required for statutory metrological inspections.
6 Technical requirements
Under specific installation conditions, a strainer or filter, fitted at the inlet of a
meter or in the upstream pipeline, may be required.
The colour black should be used to indicate the cubic metre and its multiples.
The colour red should be used to indicate sub-multiples of a cubic metre.
7 Metrological controls
Before undergoing type evaluation tests, each type of water meter submitted shall be
examined externally to ensure that it complies with the provisions of the relevant
preceding clauses of GB/T 778.1.
Annex A
(Normative)
Performance tests for water meters with electronic devices
This annex defines the programme of performance tests intended to verify that water
meters with electronic devices can perform and function as intended in a specified
environment and under specified conditions. Each test indicates, where appropriate,
the reference conditions for determining the intrinsic error.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 778.1-2018 be delivered?Answer: The full copy PDF of English version of GB/T 778.1-2018 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 778.1-2018_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 778.1-2018_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 778.1-2018 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. Question 5: Should I purchase the latest version GB/T 778.1-2018?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 778.1-2018 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of GB/T 778.1-2018?A step-by-step guide to download PDF of GB/T 778.1-2018_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 778.1-2018".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|