GB/T 32859-2016Detergent additive for diesel oil (English PDF)

5.1 Inspection classification and inspection items

Product inspection is divided into exit-factory inspection and type inspection.

5.1.1 Exit-factory inspection

The exit-factory batch inspection items include appearance, nitrogen content, sulfur content, chlorine content, density, kinematic viscosity, flash point (closed), pour point, moisture, mechanical impurities, and demulsibility. When there are no changes in raw materials and production processes that may affect product quality, the exit-factory cycle inspection item is nozzle cleanliness. The inspection cycle is every two years for normal production.

5.1.2 Type inspection

The type inspection items include all the items specified in the technical requirements of Table 1.

The type inspection shall be conducted in one of the following cases:

a) When a new product is put into production or product stereotype identification;

b) when there are great changes in raw material, production technique which may affect product quality;

c) when production is resumed after discontinued production of more than two years.

5.2 Batching

Under the conditions of the same raw materials and production technique, each can or kettle produced is a batch.

5.3 Sampling

Conduct it according to GB/T 4756. The amount of sample taken is not less than 1L for inspection and sample retention.

5.4 Rules for determination

When the results of exit-factory inspection and type inspection all meet the requirements of Table 1, the batch of products is determined to be conforming.

5.5 Reinspection rules

B.1 Scope

This method specifies the test method and test instrument for the demulsification performance of detergent additive for diesel fuel.

This method is applicable to evaluation on the demulsification performance of detergent additive for diesel fuel.

B.2 Method summary

At room temperature, put the test diesel fuel and phosphate buffer solution into a clean stoppered glass measuring cylinder. Shake the measuring cylinder as required. Then check the volume change of the water layer in the glass measuring cylinder.

B.3 Instrument

Stoppered glass measuring cylinder: 100mL, of which the graduation is 1mL.

The distance from the 100mL scale line to the mouth of the measuring cylinder is 50mm~60mm.

B.4 Reagents and materials

B.4.1 Distilled water: meet the requirements of grade 3 water in GB/T 6682

B.4.2 Acetone: analytically pure (warning: flammable, harmful to the body).

B.4.3 Glass cleaning solution: non-ionic detergent cleaning solution; if

necessary, use chromic acid lotion (warning: strong corrosive, harmful to health). B.4.4 Potassium hydrogen phosphate anhydrous: analytically pure. B.4.5 Anhydrous potassium dihydrogen phosphate: analytically pure.

B.4.6 Phosphate buffer solution (pH 7.0): Dissolve 1.15g of anhydrous

potassium hydrogen phosphate and 0.47g of anhydrous potassium dihydrogen phosphate in 100mL of distilled water. The laboratory can also use the above buffer solutions that are commercially available. […]