JB/T 51023-1999Gasoline filter assemblies - Product quality grading (English PDF)

3.1 Technical requirements

3.1.1

The fuel filter shall be manufactured in accordance with the approved product drawings and technical documents. The technical requirements shall comply with the provisions of this Standard.

3.1.2

The filter paper of the filter element shall adopt the filter paper specified on the product pattern, and be through thermal curing according to the performance requirements of the filter paper.

3.1.3

The quality of the non-paper filter media shall comply with the provisions of the product pattern.

3.1.4

Metal parts used in the fuel filter shall be rust-proof.

4.3.3

Fuel concentration of test solution impurity is 0.4 g/L.

4.3.4

Test device complies with the provisions of 6.6.1 in JB/T 8122-1999.

4.3.5

The test solution passes through the fuel filter at a rated volume flow

rate. Stop the test when the differential pressure reaches 13.33 kPa. Record the cumulative time of passing through the test solution and the total amount of test solution.

4.3.6

According to the provisions of JB/T 8122, determine and calculate the filtration efficiency.

4.3.7

Determination method of total impurities in test solution passing through the fuel filter: in accordance with the provisions of 6.5.7.8 ~ 6.5.7.10 in JB/T 8122-1999.

4.3.8

The ash capacity is calculated according to equation (1):

Where,

G - ash capacity;

W 1 - total impurities added into test solution;

W 2 - total impurities in test solution after filtration.

4.4 Vibration test method of the fuel filter

the vibration specifications are according to 3.1.12.

4.5

Test method of high-temperature resistance of the fuel filter: according to

3.1.13.

4.6

Test method of low-temperature resistance of the fuel filter: according to

3.1.14.

4.7

Test method of fuel resistance of the fuel filter: according to 3.1.15.

4.8

The requirements specified in 3.1.6 and 3.1.7 shall use visual inspection.

4.9

The requirements specified in 3.1.7 shall use general measuring tool to test.

4.10

The bubble test is according to the provisions of 6.2 in JB/T 8122-1999.

4.11

The joints of the fuel filter tube do not break in the bending and torsion tests. Test method: fix the filter housing firmly; agreed by the supplier and the […]

5.5 Product quality grading

5.5.1 Sample inspection

The sample shall be inspected according to the classifications for the unqualified specified in Table 5, Table 6 and the sampling plans specified in

Table 7, table 8, and the provisions of Clause 3 and Clause 4.

5.5.2 Determination of batch

After the sample has been checked in its entirety, if the sample has a certain number of unqualified less than or equal to the Ac value, this type shall be qualified; if the number of the unqualified of some type is greater than or equal to Re value, this type shall be unqualified; when each type is determined as qualified, this batch of products shall be qualified.

5.5.3 Quality grading

5.5.3.1

After the sample has been checked in its entirety, when the number of unqualified items of each type in the sample is less than or equal to the Ac value of the first-grade, the product to be inspected shall be the first-grade. When the number of unqualified items of each type in the sample is less than or equal to the Ac value of the qualified-grade, the product to be inspected shall be the qualified. When the number of one type of unqualified items in the sample is greater than or equal to the Re value of the qualified-grade, the product to be inspected shall be the unqualified.

5.5.3.2

When the product is graded as unqualified, it is allowed to make a review once in half a year. If qualified in review, it can still be graded as qualified product, but it must not be graded as the first-grade product.

__________ END __________ […]