GB/T 12691-2021Air compressor oils (English PDF)

Foreword

This document is drafted in accordance with the rules given in GB/T 1.1-2020, Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.

This document replaces GB/T 12691-1990, Air compressor oils, and GB/T 5904-1986, Lubricants for light duty rotary oil-flooded air compressor. Compared with GB/T 12691-1990 and GB/T 5904-1986, apart from structural adjustments and editorial changes, the main technical changes are as follows:

a) the scope has been changed to read "This document specifies the product classification and marking, requirements and test methods, inspection rules, and marking, packaging, transport, storage and delivery acceptance of mineral oil type, semi-synthetic and synthetic air compressor oils. This document applies to reciprocating or oil-drip rotary air compressor oils and oil-flooded rotary air compressor oils" (see Clause 1; Clause 1 of GB/T 12691-1990 and the "Scope" of GB/T 5904-1986);

b) the normative references have been changed (see Clause 2; Clause 2 of GB/T 12691-1990 and Clause 1 of GB/T 5904-1986);

c) product classification has been added (see 4.1);

d) two viscosity grade products, L-DAA 220 and L-DAB 220, have been added (see Table 1);

e) the test methods GB/T 30515 and NB/SH/T 0870 have been added for kinematic viscosity (40 °C) and kinematic viscosity (100 °C) (see Table 1 and Table 2);

f) a viscosity index item has been added for L-DAA and L-DAB, with the requirement "report"; the test method GB/T 1995 has been added for viscosity index and made the referee method (see Table 1 and Table 2);

g) a technical requirement for demulsibility (time for the emulsion layer to reach 3 mL) has been added for L-DAA, and the L-DAB demulsibility item has been changed from "Demulsibility (40-37-3)" to "Demulsibility (time for the emulsion layer to reach 3 mL)" (see Table 1);

h) a liquid-phase rust item has been added for L-DAA, with the requirement "pass" (see Table 1);

i) the test method for the ageing characteristics of L-DAA and L-DAB has been changed from SH/T 0192 to GB/T 12709; the requirement for the increase in carbon residue (200 °C, Fe2O3) in the ageing characteristics of L-DAB has been changed to not more than 2 (see Table 1; Table 1 of GB/T 12691-1990);

j) the neutralization value (before and after additive) item of L-DAA and L-DAB has been changed to acid value, and the test method GB/T 7304 has been added (see Table 1; Table 1 of GB/T 12691-1990);

k) the test method GB/T 17144 has been added for the carbon residue items (see Table 1 and Table 2);

l) the test method GB/T 11133 has been added for water (see Table 1 and Table 2);

m) footnotes have been added to the demulsibility, ageing characteristics, properties of the residue after 80 % removal by reduced-pressure distillation, and water items of L-DAA and L-DAB (see Table 1);

n) only viscosity grades 32, 46 and 68 have been retained for L-DAG (see Table 2);

o) a kinematic viscosity at 100 °C item has been added for L-DAG, with the requirement "report" (see Table 2);

p) the L-DAG foaming characteristic requirement at 24 °C has been changed to 50 mL/0 mL, and items at 93.5 °C and at 24 °C after 93.5 °C have been added, with requirements of 30 mL/0 mL and 50 mL/0 mL respectively (see Table 2; Table 1 of GB/T 5904-1986);

q) a rotating pressure vessel oxidation (rotating bomb) item has been added for L-DAG, with the requirement "report" and the test method SH/T 0193 (see Table 2);

r) an acid value item has been added for L-DAG, with the requirement "report" and the test methods GB/T 7304 and GB/T 4945 (see Table 2);

s) footnotes have been added to the demulsibility, oxidation stability and water items of L-DAG (see Table 2);

t) technical requirements for L-DAH and L-DAJ have been added (see Table 2);

u) Clause 5 "Sampling" of GB/T 12691-1990 and Clause 4 "Sampling" of GB/T 5904-1986 have been changed to Clause 6 "Inspection rules" (see Clause 6; Clause 5 of GB/T 12691-1990 and Clause 4 of GB/T 5904-1986).

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.

This document was proposed by and is under the jurisdiction of the National Technical Committee on Petroleum Products and Lubricants of Standardization Administration of China (SAC/TC 280).

Drafting organizations of this document: SINOPEC Research Institute of Petroleum Processing Co., Ltd., Sinopec Lubricant Co., Ltd., and PetroChina Lubricant Company.

Main drafters of this document: Han Hongling, Zhu Xinyi, Chen Lin, Liu Zhongguo, Liu Qian, Kang Yin, Chen Xiaowei, Xiong Kai, Xu Shuyan, Wang Huiyu, Li Lin and Wang Hui.

This document was first published in 1990; this is its first revision, and it incorporates GB/T 5904-1986.

1 Scope

Warning - If appropriate precautions are not taken, the products covered by this document may present hazards during production, storage, transport and use. This document does not purport to address all the safety problems associated with these products. It is the responsibility of the user to establish appropriate safety and health measures and to ensure compliance with the relevant national laws and regulations.

This document specifies the product classification and marking, requirements and test methods, inspection rules, and marking, packaging, transport, storage and delivery acceptance of mineral oil type, semi-synthetic and synthetic air compressor oils.

This document applies to reciprocating or oil-drip rotary air compressor oils and to oil-flooded rotary air compressor oils.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 259 Petroleum products - Determination of water-soluble acids and alkalis

GB/T 260 Petroleum products - Determination of water content - Distillation method

GB/T 265 Petroleum products - Determination of kinematic viscosity and calculation of dynamic viscosity

GB/T 268 Petroleum products - Determination of carbon residue (Conradson method)

GB/T 511 Petroleum, petroleum products and additives - Determination of mechanical impurities

GB/T 1995 Petroleum products - Calculation of viscosity index

GB/T 2433 Additives and lubricating oils containing additives - Determination of sulfated ash

GB/T 2541 Petroleum products - Viscosity index calculation tables

GB/T 3141 Industrial liquid lubricants - ISO viscosity classification

GB/T 3535 Petroleum products - Determination of pour point

GB/T 3536 Petroleum products - Determination of flash and fire points - Cleveland open cup method

GB/T 4756 Method for manual sampling of petroleum liquids

GB/T 4945 Petroleum products and lubricants - Determination of acid or base number (colour-indicator titration method)

GB/T 5096 Petroleum products - Corrosiveness to copper - Copper strip test

GB/T 7304 Petroleum products - Determination of acid number - Potentiometric titration method

GB/T 7305 Petroleum and synthetic fluids - Determination of water separability

GB/T 7631.9 Lubricants, industrial oils and related products (class L) - Classification - Part 9: Family D (Compressors)

GB/T 9168 Petroleum products - Determination of distillation at reduced pressure

GB/T 11133 Petroleum products, lubricating oils and additives - Determination of water - Karl Fischer coulometric titration method

GB/T 11143 Inhibited mineral oils - Determination of rust-preventing characteristics in the presence of water

GB/T 12579 Lubricating oils - Determination of foaming characteristics

GB/T 12581 Inhibited mineral oils - Determination of oxidation characteristics

GB/T 12709 Lubricating oils - Determination of ageing characteristics (Conradson carbon residue method)

GB/T 17144 Petroleum products - Determination of carbon residue - Micro method

GB/T 30515 Petroleum products - Transparent and opaque liquids - Determination of kinematic viscosity and calculation of dynamic viscosity

NB/SH/T 0164 Rules for packaging, transportation, storage and delivery acceptance of petroleum and related products

NB/SH/T 0870 Petroleum products - Determination of dynamic viscosity and density and calculation of kinematic viscosity - Stabinger viscometer method

SH/T 0193 Lubricating oils - Determination of oxidation stability - Rotating bomb method

3 Terms and definitions

No terms and definitions are listed in this document.

4 Product classification and marking

5 Requirements and test methods

The technical requirements and test methods of air compressor oils L-DAA and L-DAB shall comply with Table 1; the technical requirements and test methods of L-DAG, L-DAH and L-DAJ shall comply with Table 2.

Table 1 - Technical requirements and test methods for reciprocating or oil-drip rotary air compressor oils (L-DAA and L-DAB; the requirements are the same for both varieties unless stated otherwise):

Viscosity grade (GB/T 3141): 32, 46, 68, 100, 150, 220.

Kinematic viscosity (40 °C), mm2/s: grade 32: 28.8 to 35.2; grade 46: 41.4 to 50.6; grade 68: 61.2 to 74.8; grade 100: 90.0 to 110; grade 150: 135 to 165; grade 220: 198 to 242. Test method: GB/T 265 (a).

Kinematic viscosity (100 °C), mm2/s: report. Test method: GB/T 265 (a).

Viscosity index: report. Test method: GB/T 1995 (b).

Pour point, °C <=: -9 for grades 32, 46, 68 and 100; -3 for grades 150 and 220. Test method: GB/T 3535.

Flash point (open cup), °C >=: grade 32: 175; grade 46: 185; grade 68: 195; grade 100: 205; grade 150: 215; grade 220: 240. Test method: GB/T 3536.

Copper strip corrosion (100 °C, 3 h), class <=: 1. Test method: GB/T 5096.

Demulsibility (c) (time for the emulsion layer to reach 3 mL), min: at 54 °C <= 30 for grades 32, 46 and 68 (not required at 82 °C); at 82 °C <= 30 for grades 100, 150 and 220 (not required at 54 °C). Test method: GB/T 7305.

Liquid-phase rust (24 h): pass. Test method: GB/T 11143 (Method A).

Sulfated ash, %: L-DAA: not required; L-DAB: report. Test method: GB/T 2433.

Ageing characteristics (d), test method GB/T 12709: a) 200 °C, air - L-DAA: evaporation loss, % <= 15 and increase in carbon residue, % <= 1.5 for grades 32, 46 and 68; evaporation loss, % <= 15 and increase in carbon residue, % <= 2.0 for grades 100, 150 and 220; L-DAB: no value given. b) 200 °C, Fe2O3 - L-DAA: not required; L-DAB: evaporation loss, % <= 20; increase in carbon residue, % <= 2.0.

Properties of the residue after 80 % removal by reduced-pressure distillation (e), test method GB/T 9168: a) carbon residue, % <=: L-DAA grade 32: not required; L-DAA grades 46 to 220: 0.3; L-DAB grades 46 to 220: 0.6 (test method GB/T 268 (f)); b) ratio of the kinematic viscosity at 40 °C of the residue to that of the new oil <=: L-DAA grade 32: not required; L-DAA grades 46 to 220: 5; L-DAB grades 46 to 220: 5 (test method GB/T 265). No value is given for L-DAB grade 32.

Acid value, mg KOH/g: report. Test method: GB/T 7304 (g).

Water-soluble acid or alkali: none. Test method: GB/T 259.

Water <=: trace. Test method: GB/T 260 (h).

Mechanical impurities (mass fraction), % <=: 0.01. Test method: GB/T 511.

Note: where the purchaser has requirements, additional control indicators may be added in the purchase contract by agreement with the supplier, specific values may be set for the items marked "report", or the frequency of product inspection may be increased.

a) GB/T 30515 and NB/SH/T 0870 may also be used; in case of dispute, GB/T 265 is the referee method.

b) GB/T 2541 may also be used.

c) Not applicable to oils containing detergent additives; for air compressor oils that are Group V synthetic oils or contain Group V synthetic oils, the demulsibility requirement may be agreed between the supplier and the purchaser.

d) Applicable to mineral oil type air compressor oils; the oxidation characteristics of semi-synthetic and synthetic air compressor oils are agreed between the supplier and the purchaser.

e) Applicable to mineral oil type air compressor oils.

f) GB/T 17144 may also be used as the test method; in case of dispute, GB/T 268 is the referee method.

g) GB/T 4945 may also be used as the test method.

h) GB/T 11133 may also be used as the test method; when GB/T 11133 is used, the water mass fraction shall not exceed 0.03 %; in case of dispute, GB/T 260 is the referee method. For air compressor oils that are Group V synthetic oils or contain Group V synthetic oils, the water requirement may be agreed between the supplier and the purchaser.