GB 1788-1979Jet fuel No.2 (English PDF)

Foreword

This standard applies to jet fuel produced by processing natural crude oil. The product is manufactured from the raw materials and by the production process used for the trial samples that passed the appraisal procedure prescribed by the State. Its designation code is RP-2.

Additives of various kinds that help to raise or improve the quality of jet fuel may be added to this product, singly or in combination; the amounts and types added are specified separately according to the particular circumstances.

Issued by the State Bureau of Standards; implemented on 1 July 1980. Proposed by the Ministry of Petroleum Industry of the People's Republic of China. Drafted by the Research Institute of Petroleum Processing.

Note: from the date of implementation of this standard, the former ministry standard SY 1006-77 is abolished.

1 Technical requirements

The product shall meet the following requirements (item - quality indicator - test method):

Density (20 °C), g/cm3, not less than: 0.775 - SY 2206-76.

Distillation range - GB 255-77: initial boiling point, °C, not higher than 150; 10% recovered temperature, °C, not higher than 165; 50% recovered temperature, °C, not higher than 195; 90% recovered temperature, °C, not higher than 230; 98% recovered temperature, °C, not higher than 250; residue and loss, %, not more than 2.0.

Flash point (closed cup), °C, not lower than: 28 - GB 261-77.

Kinematic viscosity, cSt - GB 265-75: at 20 °C, not less than 1.25; at -40 °C, not more than 8.0.

Crystallization point, °C, not higher than: -50 - SY 2204-76 (by the non-dehydrated method).

Aromatic hydrocarbon content, %, not more than: 20 - SY 2115-77.

Iodine value, g I/100 g, not more than: 4.2 - SY 2114-77.

Acidity, mg KOH/100 mL, not more than: 1.0 - GB 258-77.

Sulphur content, %, not more than: 0.2 - GB 380-77.

Mercaptan sulphur content, %, not more than: 0.002 - GB 505-65.

Copper strip corrosion (100 °C, 2 hours): pass - SY 2222-76.

Silver strip corrosion (50 °C, 4 hours), grade, not more than: 1 - SY 2223-76.

Net heat of combustion, kcal/kg, not less than: 10250 - GB 384-64, Note 1.

Combustion properties (one of the following requirements shall be met): (1) smoke point, mm, not less than 25 - GB 382-77; (2) naphthalene hydrocarbon content (when the smoke point is not less than 20 mm), %, not more than 3 - SY 2227-77; (3) luminometer number, not less than 45 - SY 2225-77.

Existent gum, mg/100 mL, not more than: 5.0 - GB 509-77.

Ash, %, not more than: 0.005 - GB 508-65.

Water-soluble acids or alkalis: none - GB 259-77.

Mechanical impurities and water: none - Note 2.

Water reaction - GB 1793-79: volume change, mL, not more than 1; interface condition, grade, not more than 1b; degree of separation, grade: to be measured and reported.

Note 1: calculation by SY 2210-77S, Determination of net heat of combustion of jet fuels (calculation method), is permitted.

Note 2: pour the oil sample into a 100 mL glass graduated cylinder and observe at 15 °C to 25 °C; it shall be clear, with no suspended or settled mechanical impurities or water. In case of dispute, determine by GB 511-77 and GB 260-77.

Note 3: dynamic thermal stability shall be actually measured by SY 2226-77S at least once a year.

2 Packaging, marking, storage, transport and delivery acceptance

Packaging, marking, storage, transport and delivery acceptance of this product shall be carried out in accordance with SY 2000-78.

3 Sampling

Sampling shall be carried out in accordance with SY 2001-77; 2.5 L shall be taken for inspection and as a retained sample.

Amendment No. 1

Amendment No. 1 to GB 1788-1979, Jet fuel No. 2, was approved by the State Bureau of Standards on 16 May 1988 by document Guo Biao Fa Bian Zi [1988] No. 092, and has been in effect since 1 December 1988.

I. In the technical requirements: for the item density at 20 °C, the unit "g/cm3" is changed to "kg/m3" and the quality indicator is changed to "775"; for the item net heat of combustion, the unit "kcal/kg (kJ/kg)" is changed to "MJ/kg" and the quality indicator "10 250" is changed to "42.9"; for the item copper strip corrosion, "(100 °C, 2 hours)" is changed to "(100 °C, 2 h), grade, not more than", and the quality indicator is changed from "pass" to "1".

II. Note 1 is changed to "calculation by GB 2429, Calculation method for net heat of combustion of aviation fuels, is permitted".