GB/T 6907-2022 English PDF (GBT6907-2022)

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GB/T 6907-2022: Analysis of water used in boiler and cooling system - Sampling method of water
GB/T 6907-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.060.25
CCS G 76
Replacing GB/T 6907-2005
Analysis of water used in boiler and cooling system -
Sampling method of water
ISSUED ON: MARCH 09, 2022
IMPLEMENTED ON: OCTOBER 01, 2022
Issued by: State Administration for Market Regulation;
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 Method summary ... 5 
5 Sampling container ... 6 
6 Collection method of water samples ... 6 
7 Other matters of water sample collection ... 11 
8 Storage and transportation of water samples ... 11 
9 Water sample collection record ... 11 
Appendix A (Informative) Reference volume and storage time for water sample
collection ... 12 
Appendix B (Informative) Water sample collection record ... 13 
Analysis of water used in boiler and cooling system -
Sampling method of water
1 Scope
This document describes the collection container, collection method, storage,
transportation and recording of samples of water used in boiler and cooling system.
This document applies to the collection of samples of water used in boiler and cooling
system.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 1576, Water quality for industrial boilers
GB/T 6682-2008, Water for analytical laboratory use - Specification and test
methods
GB/T 6903, Analysis of water used in boiler and cooling system - General rule
GB/T 50050, Code for design of industrial recirculating cooling water treatment
3 Terms and definitions
Terms and definitions defined in GB/T 1576, GB/T 6903 and GB/T 50050 apply to this
document.
4 Method summary
According to the determination requirements, select a suitable sampling container,
collect water samples at representative locations, and obtain representative water
samples that meet the requirements according to the storage and transportation
conditions of the samples.
6.3 Collection methods of water samples in high temperature and high-pressure
devices or pipelines
6.3.1 When sampling in high temperature and high-pressure devices or pipelines, the
sampling pipe shall be made of stainless steel. Sampling devices for boiler feed water,
boiler water, steam and drain shall be equipped with coolers.
6.3.2 When collecting water samples installed with a sampling cooler, the opening of
the sampling valve shall be adjusted so that the flow rate of the water sample is at 300
mL/min ~ 700 mL/min, and the flow rate is kept stable. At the same time, adjust the
amount of cooling water, so that the temperature of the water sample is less than 40 °C.
The sampling valves for feed water, boiler water and steam shall be kept open; when
collecting other water samples, the accumulated water in the pipeline shall be drained
and rinsed before sampling.
6.4 Other special collection methods of water samples
6.4.1 When determining unstable components in water samples, it shall be measured on
site. If it is not possible to measure on site, the unstable components shall be converted
into stable state and then measured.
6.4.2 When measuring the organics in raw water, circulating cooling water and its
make-up water, it shall be measured as soon as possible after sampling, otherwise, the
water sample shall be adjusted to pH less than 2 by adding acid for preservation; when
measuring trace organics in the water samples involved in the boiler water treatment
system, the water sample is subject to no treatment after collection, and shall be
measured as soon as possible.
6.4.3 When measuring trace of iron, copper, aluminum and other components in the
water sample, the sampling bottle shall be soaked in hydrochloric acid solution (1+1)
of analytical grade or above for more than 12 hours, and then fully cleaned by grade-1
water that meets the requirements of GB/T 6682-2008. Before sampling, add an
appropriate amount of hydrochloric acid solution (1+1) of guaranteed reagent or above,
or nitric acid solution (1+1) to the sampling bottle in advance to make the pH value of
the water sample about 2; shake it up immediately after sampling. If there is no acid
addition condition, filter 10 L ~ 20 L of water sample by membrane method; measure
the metal ions on the filter membrane and in the filtrate respectively, to obtain the
content of metal ions in the water sample.
6.4.4 When measuring the hydrazine content in water samples, a special ground glass
bottle shall be used to collect water samples; 1 mL of hydrochloric acid of analytical
reagent or above shall be added in advance for every 100 mL of water samples, and the
collected water samples shall fill the sampling bottle.
6.4.5 When determining the bacterial content in water, pre-sterilized sealed glass bottles
or commercially available disposable sterilized sampling bottles shall be used to collect
water samples, which shall be measured within 24 hours after sampling.
7 Other matters of water sample collection
7.1 Before sampling, the sampling bottle shall be cleaned in advance, and then rinsed
three times with the water sample to be tested (except as otherwise specified in the test
method); then, the water sample shall be collected and quickly sealed.
7.2 The sampling volume shall meet the test and review needs. Appendix A gives the
reference volume for water sample collection. If the water sample is turbid, the
collected water sample shall be divided into two sampling containers.
7.3 The collected water samples shall be labelled, indicating the name of the water
sample, the sampling location, the name of the sampling person, and the sampling time.
7.4 When collecting water samples for field control test, special sampling bottles with
obvious marks shall be used.
8 Storage and transportation of water samples
8.1 Storage and transportation conditions of water samples
Water samples shall be stored in a cool and dry place, or refrigerated if conditions
permit. If there are special requirements, save them according to the relevant test
requirements. Water samples shall be protected from freezing and sunshine during
transportation; when measuring the stored or transported water samples, the storage
time and storage conditions shall be indicated in the water sample collection record
form (see Appendix B).
8.2 Storage time of water samples
The water samples shall be measured in time after collection, and the storage and
transportation time shall be shortened as much as possible. See Appendix A for the
reference time for storage of water samples after collection.
9 Water sample collection record
See Appendix B for the format of water sample collection record.