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GB 25502-2017: Minimum allowable values of water efficiency and water efficiency grades for water closets
GB 25502-2017
GB
NATIONAL STANDARD OF THE
PEOPLE?€?S REPUBLIC OF CHINA
ICS 91.140.70
Q 31
Replacing GB 25502-2010
Minimum allowable values of water efficiency and
water efficiency grades for water closets
ISSUED ON: MARCH 09, 2017
IMPLEMENTED ON: SEPTEMBER 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Technical requirements ... 6
5 Calculation and test methods ... 7
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB 25502-2010 "Minimum allowable values of water
efficiency and water efficiency grades for water closets". Compared with GB
25502-2010, the main technical changes in this Standard are as follows:
- added the term and definition for average water consumption of water
closet;
- modified the calculation formula for average water consumption in 4.2 of
GB 25502-2010 according to GB 6952;
- modified the water efficiency in Clause 4.
This Standard was proposed by National Development and Reform
Commission, Ministry of Water Resources.
This Standard shall be under the jurisdiction of Subcommittee on Water
Efficiency of Water Products and Appliances of National Technical Committee
on Industrial Water Saving of Standardization Administration of China (SAC/TC
410).
The drafting organizations of this Standard: China National Institute of
Standardization, Anhui Product Quality Supervision and Inspection Institute,
Yiyuan (Shanghai) Energy Conservation and Environmental Protection
Technology Co., Ltd., China Building Materials Inspection and Certification
Group (Shaanxi) Co., Ltd., Jiumu Kitchen and Bath Co., Ltd., Huida Sanitary
Ware Co., Ltd., Luda (Xiamen) Industrial Co., Ltd., Foshan Shunde District
Lehua Ceramic Sanitary Ware Co., Ltd., Foshan Fa'en Sanitary Ware Co., Ltd.,
Liaoning Supor Ceramics Industry Co., Ltd., Xinle Sanitary Ware (Foshan) Co.,
Ltd., Roca (China) Co., Ltd. Company, Guangdong Anbi Technology Co., Ltd.,
Guangdong Rongxin Sanitary Ware Industry Co., Ltd., Guangdong Kangna
Sanitary Ware Technology Co., Ltd., Chaozhou Muye Ceramic Products Co.,
Ltd., Anhui Xueyu Sanitary Ware Co., Ltd., Xiamen Anbaili Plastic Co., Ltd.,
Henan Lang Di Porcelain Industry Co., Ltd., Changge Donghong Ceramic
Products Co., Ltd., Changge Yuandong Ceramics Co., Ltd., Zhejiang Surda
Sanitary Ware Co., Ltd., Zhejiang Jinbo Fluid Control Co., Ltd., Zhejiang Gaobo
Sanitary Ware Co., Ltd., Mingdun Co., Ltd. Company, Yuhuan Jinlong Ouyu
Sanitary Ware Co., Ltd.
Main drafters of this Standard: Zhu Chunyan, Zhu Shuangsi, Bai Xue, Lin Sen,
Wang Yujie, Chen Chunhong, Cai Kuan, Cheng Xiaomin, Zhang Weixing,
Shang Bei, Lin Xiaofa, Wang Yanqing, Xu Chuankai, Yan Bangping, Fang Chun,
Dai Aichun, Hu Yaping, Peng Yiqun, Su Yaoguang, Chen Rongxiang, Chen
Minimum allowable values of water efficiency and
water efficiency grades for water closets
1 Scope
This Standard specifies the minimum allowable values of water efficiency, water
saving evaluation values, water efficiency grades and test methods for water
closets.
This Standard is applicable to the water efficiency evaluation of all types of
water closets installed on cool water pipelines in building facilities and the water
supply pressure is not greater than 0.6MPa.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB 6952 Sanitary wares
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB 6952
as well as the followings apply.
3.1 average water consumption of water closet
The water consumption of the water closet which is measured and calculated
according to the test method and calculation formula stipulated by the standard.
3.2 minimum allowable values of water efficiency for water closet
The maximum water consumption allowed for the water closet, under the test
conditions stipulated by the standard, when it meets the general technical
requirements, flushing function requirements, and supporting technical
requirements.
NOTE: The water consumption of a single flush water closet refers to its average water
consumption. The water consumption of a double flush water closet includes the average