This standard specifies the sampling inspection procedure and qualified assessment rules for synthetic fiber ropes with the average value of linear density and the minimum value of breaking strength as quality indicators. This standard applies to batch inspection of synthetic fiber ropes. SC/T 5024-2002 Sampling method and qualified assessment rules for fishing gear materials Synthetic fiber rope SC/T5024-2002 standard download decompression password: www.bzxz.net

ICS65.150
Aquatic Industry Standard of the People's Republic of China
SC/T5024—2002
Sampling methods and acceptance lot decisionrules of fishing gear materials--Synthetic fiber ropes2002-11-05Promulgated
Ministry of Agriculture of the People's Republic of China
Implementation on 2002-12-20
SC/T5024--2002
This standard is in accordance with ISO)2307:1990 Determination of physical and mechanical properties of ropes. The sample size is determined according to the batch; the linear density and breaking strength are the main quality characteristics of synthetic fiber ropes, the linear density is the average value, the breaking strength is the minimum value, and the judgment array is a counting test with 0 and 1. This standard is issued by the Ministry of Agriculture of the People's Republic of China. This standard is issued by the Technical Committee on Fishing Gear Materials of the National Technical Committee for Standardization of Fisheries. The drafting units of this standard are: Donghai Fisheries Research Institute of Chinese Academy of Fishery Sciences, Quality Supervision, Inspection and Testing Center of Rope and Net Products of the Ministry of Agriculture. The main drafters of this standard are: Le Weizhang and Guo Yiping. 1 Scope Sampling methods for fishing gear materials and qualified batch determination rules Synthetic fiber ropes SC/T 5024—2002 This standard specifies the sampling inspection procedures and qualified batch determination rules with the average value of the linear density and the minimum value of the breaking strength of synthetic fiber ropes as quality indicators. This standard is applicable to the batch inspection of synthetic fiber ropes. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For the dated referenced documents, all the subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to the agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For the undated referenced documents, the latest versions shall apply to this standard. (B/T3358.1—1993 Statistical terms Part 1—General statistical terms GB/T3358.2—1993 Statistical terms Part 2 Statistical quality control terms GB/T8054-1995 Standard for measurement of average values ​​- Single sampling inspection procedures and sampling tables GH/T8834-1988 Determination of physical and mechanical properties of ropes GB/T19000—2000 Quality management system foundation and terminology SC/T5001-1995 Basic terms of fishing gear materials 3 Terms, definitions and symbols
3. 1. Terms and definitions
The terms and definitions established in GB/T3358.1G13/T3358.2, G13/T1900G, 56/T5001-1995 and the following terms and definitions apply to this standard.
Batch dot:batch
A certain number of individuals produced under consistent conditions or collected in a specified manner. 3. 1. 2
Lot size; batch size
The number of individuals included in the batch,
Sample sariple
One or more individuals taken from a population are used to provide information about the population and serve as the basis for making certain judgments about the population, 3. 1. 4
Sample size
sample size
Number of sampling individuals included in the sample
Samplingsampling
The reverse process of randomly selecting or forming a sample.
Singlesampling
SC/T 5024—2002
Sampling method of taking only one sample from the batch. 3.1.7
Conformity
Meeting the specified requirements.
Nonconformity
Not meeting the specified requirements.
Inspection
The activity of measuring, testing, testing or measuring one or more characteristics of an entity and comparing the results with the specified requirements to determine the completeness of each characteristic. 3.1.10
Inspection lot
Inspection lot
A certain number of individuals produced under uniform conditions and submitted for inspection. 3.1. 11
Batch inspection: lot inspection
Inspection conducted to determine the quality of a batch. 3.2 Symbols
The following symbols apply to this standard.
N: batch size.
: sample mean
: upper specification limit (the maximum value of the specified qualified quality).
: lower specification limit (the minimum value of the specified qualified quantity). X: represents the quality property of the first unit product. X: sample mean.
S: sample standard deviation.
A: qualified judgment number (the maximum number of unqualified products allowed in the sample for batch qualified judgment). R: unqualified delimited number (the minimum number of unqualified products allowed in the sample for batch unqualified judgment). A, R are the decision matrix of the proposed sampling plan. Q: upper specification limit quality statistic.
Q, =x
Q: quality statistic of the lower specification limit,
Q -xt
: acceptance constant (constant used to determine whether the batch is qualified or not). 4: Sampling inspection procedure
The inspection procedure specified in this standard is as follows:
a) Determine the inspection batch;
+++++..( 2)
....(4
Determine the quality characteristics to be inspected:
Determine the type and method of sampling inspection;
Specify the qualified quality;
Select the sample mouse;
Search the sampling plan;
Take the sample;
Test the sample and calculate the result;
Determine whether the inspection batch is qualified or not.
5 Implementation of sampling inspection
Determine the inspection batch
SC/T 5024—2002
Determine the inspection batch according to the requirements. The products of the inspection batch are composed of ropes of the same manufacturer, the same material, the same type, the same nominal diameter, the same grade, and the same series of manufacturing processes. 5.2 Determine the quality characteristics to be inspected
The quality characteristics to be inspected of synthetic fiber ropes are linear density and breaking strength. 5.3 Determine the type and method of sampling inspection
Use a sampling inspection. The linear density is the average value measurement type\S method double-sided specification limit sampling inspection, and the breaking strength is the counting type sampling inspection.
5.4 Qualified quality requirementsbZxz.net
The upper and lower specification limits of the linear density and the minimum value of the breaking strength of the qualified synthetic fiber rope shall be clearly specified in the product standard or order contract.
5.5 Selection of sample quantity
The unit product of synthetic fiber rope is a rope roll consisting of a standard delivery length of 100m, 200m, 220m or a delivery length specified in the contract. The batch is the number of rope rolls contained in the batch. According to 1, the sample is selected by batch. Table 1 Batch and sample size
Batch (N)
15--59
77--126
127--189
190---264
265-351
358--451
565-589
Sample A (mb
You can take a roll and cut out 20 samples from it. Batch base (N)
590---826
827--976
977~1139
1 140--.1 :14
1 315-1 591
1 502 --1 701
1702-1914
1 915 -- 2 139
2 140 -- 2 375
2 377 -- 2 626
Sample slide ()
一5.1, rounding according to the numerical rounding rules, when n≤25, the rounding interval is 1. When n25, the rounding interval is 5.3
SC/T 5024—2002
5.6 Sampling plan for inspection
5.6.1 Linear density sampling plan
Select the sample number n from 5.5. Read the acceptance constant directly in the row where n is in Table 2 (according to Table 1 in GB/T8054-1995). Table 2 Acceptance constant K
—3.785
-—0. 564
5. 6.2 Sampling plan for breaking strength
—0. 507
—0，464
The sample size is selected by 5.5. The judgment array is [0,1], that is, A.0, R.=1. 5.7 Sample extraction
—0. 265
Randomly select 1 rope roll of the selected quantity in 5.5 from the inspection batch. Take one sample from any end of each roll drawn, or when the rope roll is ready to be cut, take a sample from the middle of the subsequent roll. When the batch is 1 to 14 rolls, a rope roll can be drawn, and two samples can be cut from the rope roll as described above. Take all necessary measures to avoid the sample from retreating. If necessary, any end that has retreated slightly can be discarded.
5. 8 Sample testing and calculation
The sample is taken one by one to measure the linear density and breaking strength according to the provisions of GB/T8834-1988. The test results should be recorded completely and accurately, and the location where the break occurs during the breaking strength test must be recorded. Calculate the sample mean X and sample standard deviation S of the linear density. If the breaking strength test value of the sample is not lower than the breaking strength index value of the product standard (or contract provisions) and the grade record; or when the break occurs outside the two marks (5.2.2 in B3/18834-1988), the test value is not lower than 90% of the index value, then the rope roll is recorded as qualified products, otherwise the rope roll is recorded as unqualified products.
6 Judgment rules
Judgment of whether the linear density is qualified or unqualified
Q. ,Q is calculated according to formula (3) and formula (1),
If Q and Q, the linear density is qualified:
If or Q;, the linear density is unqualified.
6.2 Judgment of whether the minimum breaking strength is qualified or unqualified If the number of unqualified products is zero (R=0), the minimum breaking strength is qualified: when the number of unqualified products is greater than (R=1), the minimum breaking strength is unqualified. 4
3 Judgment of whether the inspection batch is qualified or unqualified
If both the linear density and the minimum breaking strength are qualified, the inspection batch is qualified: if one of the linear density or the minimum breaking strength is unqualified, the inspection batch is unqualified, SC/T5024—2002
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