GB/T 778.4-2018: Meters for cold potable water and hot water -- Part 4: Non-metrological requirements not covered in GB/T 778.1

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Scope

This part of GB/T 778 stipulates that the volume of cold water and hot water is measured in a closed full pipeline and equipped with a cumulative flow indicator device.
Technical characteristics requirements for water meters and hot water meters.
This section applies to the following types of water meters.
a) The maximum allowable pressure (MAP) is greater than or equal to 1MPa (0.6MPa for a water meter with a nominal pipe diameter DN≥500mm);
b) Cold drinking water meter with a maximum allowable temperature (MAT) of 30℃;
c) A hot water meter with a maximum allowable temperature (MAT) of up to 180℃ according to the grade.
This part applies not only to water meters based on mechanical principles, but also to water meters based on electrical or electronic principles and with electronic devices based on mechanical principles.
A water meter for measuring the volume flow of cold drinking water and hot water. This section also applies to electronic auxiliary devices. Usually electronic auxiliary devices are optional
Installation parts, but national or international regulations may determine certain auxiliary devices as necessary parts based on the usage of the water meter.

Basic Data

Standard ID	GB/T 778.4-2018 (GB/T778.4-2018)
Description (Translated English)	Meters for cold potable water and hot water -- Part 4: Non-metrological requirements not covered in GB/T 778.1
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	N12
Classification of International Standard	91.140.60
Word Count Estimation	30,394
Date of Issue	2018-06-07
Date of Implementation	2019-01-01
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration