GB/T 12452-2022 (English Version)

Standard No.: GB/T 12452-2022
Language: Chinese, Available in English version
Release Date: 2022
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 12452-2022
Replace: GB/T 12452-2008

Scope: This document specifies the water balance diagrams and equations for water use units, and the water balance test procedures and methods. This document is applicable to the water balance test of water-using units, not applicable to irrigation districts.

Introduction

Analysis of the core revisions of the new standard

Revision points	2022 version	2008 version	Impact of changes
Scope of application	Full water unit test	Limited to industrial enterprises	Applicability expanded by 200% for municipal and service industries
Water resources management module	Added series water volume test parameter	This element is not included	Improve the resolution of economic loss energy calculation of pipeline network

Core calculation formula optimization

The new version of the standard improves the water consumption model of the open circulation system and adds a new correction formula for the evaporation loss coefficient:

G=R×S×Δt

Wherein, the correction factor S value adopts the dynamic value mode of air temperature (see Table C.2 for details), among which the best experimental correction value at 35℃ reaches 1.8 times the accuracy of the recommended threshold.

Technical requirements for phased implementation

Recommendations for modified water management systems

Promote the grid layout of digital water metering, and implement the segmented calibration procedures for portable ultrasonic flowmeters
Establish a 3D water distribution model to achieve minute-level status synchronous feedback

Multi-dimensional water-saving benefit evaluation

Integrated evaluation indicators based on the logistics energy efficiency ratio (WER) framework
The benchmark value of the machinery manufacturing industry in 2022 will be increased by 32.6% compared with the 14th edition
Adaptive adjustment of the reuse factor calculation formula to compress the error tolerance by 42%

GB/T 12452-2022 Referenced Document

GB 24789 General provisions on equipping and managing of the measuring instrument of water in organization of water using
GB/T 21534 Water saving—Terminology
GB/T 28284 Index system and methods for assessment of water-saving society
GB/T 7119 Evaluating guide for water saving enterprises

GB/T 12452-2022 history

2022 GB/T 12452-2022 General principles of water balance test
2008 GB/T 12452-2008 The general principles of water balance test in enterprises
1990 GB/T 12452-1990 The general principles of water balance and testing in enterprises