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GB/T 778.5-2018Meters for cold potable water and hot water -- Part 5: Installation requirements (English PDF)

饮用冷水水表和热水水表第5部分：安装要求

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

June 7, 2018

Implementation date

January 1, 2019

Scope

GB/T 778.5-2018 is the English-translated version of 饮用冷水水表和热水水表第5部分：安装要求.

GB/T 778.5-2018 is the Chinese standard "Meters for cold potable water and hot water -- Part 5: Installation requirements". Its scope clause reads: This part of GB/T 778 specifies the selection, installation and special requirements of water meters for single water meters, double water meters, coaxial water meters and connecting pipes.

Seek guidelines for the first use of new or improved water meters to ensure accurate and stable measurements and reliable readings. This section applies to water meters that measure the volume of drinking cold water and hot water in a closed full pipe and are equipped with a cumulative flow indicating device.

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 volume of cold water and hot water.

This section also applies to electronic aids. Usually the electronic aid is an option. However, national or international regulations may determine certain auxiliary devices as necessary for the use of the water meter.

The recommendations in this section apply to water meters that are defined as integrated meters and that continuously measure the volume of water flowing through any technique.

Note. National regulations are higher than the provisions of this section. Its clauses include terms and definitions.

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Document preview — GB/T 778.5-2018

National Standard of the People's Republic of China

ICS: 91.140.60
Classification: N 12

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
8.3.3);
8.5.1).

1 Scope

This part of GB/T 778 specifies the selection, installation and special requirements of water meters for single water meters, double water meters, coaxial water meters and connecting pipes.

Seek guidelines for the first use of new or improved water meters to ensure accurate and stable measurements and reliable readings.

This section applies to water meters that measure the volume of drinking cold water and hot water in a closed full pipe and are equipped with a cumulative flow indicating device.

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 volume of cold water and hot water. This section also applies to electronic aids. Usually the electronic aid is an option.

However, national or international regulations may determine certain auxiliary devices as necessary for the use of the water meter.

The recommendations in this section apply to water meters that are defined as integrated meters and that continuously measure the volume of water flowing through any technique.

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 dated versions apply to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 778.1-2018 Drinking cold water meters and hot water meters - Part 1. Quantitative requirements and technical requirements (ISO 4064-1.

2014, IDT)

ISO 6817 Measurement of the flow rate of conductive liquids in closed pipes. Method of use of electromagnetic flowmeters (Measurementof

Conductiveliquidflowinclosedconduits-Methodusingelectromagneticflowmeters)

3 Terms and definitions

The following terms and definitions as defined in GB/T 778.1-2018 apply to this document.

3.1 Parallel operation in parallel

< Water Meter> Two or more water meters are connected to a common water source and a public water supply pipe.

3.2 Multi-table running multiplemeteroperation

The water inlets of several water meters are connected to a common water source, or the outlets are connected to a common water supply pipe (two

The situation does not exist at the same time).

3.3 Adapter adaptor

< Water meter> is used to connect the plug-in water meter with different geometrical and unmodified shapes to the connection interface of another geometric size.

A mechanical device mounted on the connection interface.

3.4 Converter

< Water Meter> A connection interface of a complete unit consisting of several components before being loaded into the water supply system. […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 24 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 778.1-2018Meters for cold potable water and hot water -- Part 1: Metrological requirements and technical requirements

ISO 4064 · ISO 6817

Cited by

GB/T 44918-2024Management specification for water conservation of urban water supply institutions

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