GB/T 17617-2018 English PDF (GBT17617-2018)

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GB/T 17617-2018: Rule of sampling and inspection for refractory raw materials
GB/T 17617-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 81.080
Q 40
Replacing GB/T 17617-1998
Rule of sampling and inspection for refractory raw materials
(ISO 8656-1:1998, Refractory products - Sampling of raw materials and unshaped
products - Part 1: Sampling scheme, MOD)
ISSUED ON: FEBRUARY 06, 2018
IMPLEMENTED ON: JANUARY 01, 2019
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
National Standardization Administration.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 General ... 8
5 Sampling inspection of bulk refractory raw materials ... 9
5.1 Sampling inspection procedure ... 9
5.2 Group-batching ... 10
5.3 Determination of the increment size (mI) ... 11
5.4 Determination of the number of increments (nI) ... 11
5.5 Sampling of increment ... 13
5.6 Synthesis of gross samples and reduction of laboratory samples ... 14
5.7 Laboratory sampling ... 15
5.8 Preparation and testing of test samples ... 15
5.9 Product quality assessment ... 15
6 Sampling inspection of packaged particle size graded materials ... 17
6.1 Sampling inspection procedure ... 17
6.2 Group-batching ... 17
6.3 Extraction of unit packages ... 19
6.4 Taking of unit package samples ... 19
6.5 Laboratory sampling, test sample preparation, testing ... 20
6.6 Product quality assessment ... 20
7 Sampling inspection report ... 22
Appendix A (Informative) Correspondence of chapter and clause numbers between this
standard and ISO 8656-1:1988 ... 24
Appendix B (Informative) Technical differences between this standard and ISO 8656-
1:1988 ... 25
Appendix C (Normative) Calculation of standard deviation and precision of sampling
inspection ... 26
Appendix D (Normative) Empirical estimation of coefficient of variation of quality
characteristics of refractory raw materials ... 36
Appendix E (Normative) Reduction method of refractory raw material sample ... 37
Rule of sampling and inspection for refractory raw materials
1 Scope
This standard specifies the terms and definitions, general principles, sampling
inspection of bulk refractory raw materials, sampling inspection of packaged particle
size graded materials, sampling inspection reports, etc. for sampling inspection of
refractory raw materials.
This standard applies to sampling inspection of refractory raw materials.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 6005 Test sieves - Metal wire cloth, perforated metal plate and electroformed
sheet - Nominal sizes of openings
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 18930 Terminology for refractories
GB/T 22555 Acceptance sampling plans and procedures for the inspection of bulk
materials
3 Terms and definitions
The terms and definitions, as defined in GB/T 18930, as well as the following terms
and definitions, apply to this document.
3.1
Refractory raw materials
Bulk refractory materials with the appearance of blocks, granules, powders or
mixtures thereof, used to prepare shaped or amorphous refractory products.
3.2
f) The packaging of samples and the transportation and delivery method to the
inspection laboratory;
g) Laboratory sampling requirements, quality characteristic test methods, the
number of test samples;
h) Rules for evaluating the quality of the inspection batch products based on the
sample test results.
4.2 If the purpose of sampling inspection is to accept the quality of the product, the
sampling inspection scheme shall also clearly specify the quality characteristics items
to be inspected for acceptance. It shall be noted that not all quality characteristics
specified in product quality standards or technical requirements shall be used as
acceptance inspection items. Generally, chemical composition and no more than three
relatively independent main physical characteristics shall be selected as acceptance
inspection items.
4.3 During sampling, sample preparation, sample transfer and storage, care shall be
taken not to change the test performance of the original state of the material, and to
prevent any change in the properties to be tested. For example, when collecting samples
for moisture detection, the sampler shall be made of non-hygroscopic materials,
meanwhile the sample shall be sealed immediately after collection.
5 Sampling inspection of bulk refractory raw materials
5.1 Sampling inspection procedure
For bulk refractory raw materials that have not been graded, sampling inspection shall
be carried out according to the procedure shown in Figure 1. The specific steps are as
follows:
a) Divide into batches;
b) Determine the quantity of each increment;
c) Determine the number of samples to be taken from the inspection batch;
d) Take increment;
e) Synthesize a gross sample;
f) Divide the gross sample into two laboratory samples;
g) Use one of the laboratory samples for testing;
h) Evaluate the quality of the product based on the test results of the first laboratory
of the batch product μ for estimation. σI can be calculated according to the method given
in Appendix C.
5.4.3 If there are not enough previous test data of the same product to be inspected,
meanwhile the exact value of the coefficient of variation CV of the quality characteristic
cannot be obtained, the product non-uniformity category can also be estimated
according to the empirical method in Appendix D, under the agreement of the sampling
personnel of the relevant parties.
5.4.4 There are often more than one quality characteristic to be inspected for a batch of
products; their coefficients of variation CV are usually different. In this case, the value
of the minimum number of samples nI shall be determined, based on the largest
coefficient of variation CV among the quality characteristics to be inspected.
For bulk refractory raw materials, nI shall usually be determined based on the largest
coefficient of variation among the main chemical composition, bulk density, water
absorption.
5.5 Sampling of increment
5.5.1 Before sampling, the inspection batch of products shall be divided into several
parts equal to the number of increments nI, according to the actual sampling conditions;
the volume or weight of the material in each part shall be roughly equal. If sampling is
done during the dynamic process of product loading and unloading, the sampling
intervals can be divided by time; if sampling is done during the static state of product
stacking, the sampling intervals can be divided by regional location.
5.5.2 Dynamic sampling shall be preferred for increment sampling. When sampling in
a dynamic manner, within the first sampling interval, the time point for increment
sampling shall be random, but it cannot start at the starting point. Subsequent increment
sampling shall be done at equal intervals, until the sampling of the entire batch of
products is completed.
5.5.3 When sampling in a static manner, the sampling points for each regional increment
sampling shall not be the same in spatial position. Whether it is a singl...