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MHT6093-2013: Assessment of the compatibility of gas turbine lubricants with elastomers. Gravimetric method
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| MH/T 6093-2013 | English | 29 |
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Assessment of the compatibility of gas turbine lubricants with elastomers. Gravimetric method
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MH/T 6093-2013
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Standard similar to MHT6093-2013 MH/T 6092 MH/T 6096 MH/T 6091 Basic data | Standard ID | MH/T 6093-2013 (MH/T6093-2013) | | Description (Translated English) | Assessment of the compatibility of gas turbine lubricants with elastomers. Gravimetric method | | Sector / Industry | Civil Aviation Industry Standard (Recommended) | | Word Count Estimation | 1,128 | | Date of Issue | 28/5/2013 | | Date of Implementation | 1/8/2013 | | Issuing agency(ies) | Civil Aviation Administration of China | MHT6093-2013: Assessment of the compatibility of gas turbine lubricants with elastomers. Gravimetric method
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Assessment of the compatibility of gas turbine lubricants with elastomers.Gravimetric method
ICS 75.100
E 34
MH
Civil Aviation Industry Standard of the People's Republic of China
Compatibility of Gas Turbine Engine Lubricants and Elastomers
Test method gravimetric method
2013-05-28 released
2013-08-01 implementation
Issued by Civil Aviation Administration of China
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the Aircraft Airworthiness Certification Department of the Civil Aviation Administration of China.
This standard was approved by the Aircraft Airworthiness Certification Department of the Civil Aviation Administration of China.
This standard is under the jurisdiction of the China Academy of Civil Aviation Science and Technology.
Drafting organization of this standard. The Second Research Institute of Civil Aviation Administration of China.
The main drafters of this standard. Liu Hua, Chen Kai, Yang Zhiyuan, Qian Jing, Xia Zuxi.
Test method for compatibility of gas turbine engine lubricating oil and elastomer gravimetric method
1 Scope
This standard specifies the gravimetric method for testing the compatibility of gas turbine engine lubricants with elastomers.
This standard is applicable to assess the compatibility of gas turbine engine lubricants with elastomers.
2 Method overview
2.1 Completely immerse the elastomer sample in the lubricating oil to be tested that has been heated to the test temperature. During the test, the lubricating oil to be tested is open to the atmosphere.
And maintain a constant temperature. After the test, the elastomer sample was placed in unheated lubricating oil to cool.
2.2 Measure the change in the weight of the elastomer, and then evaluate the embrittlement characteristics of the elastomer.
3 Equipment
This test uses the following equipment.
a) Heating device, see Appendix A;
b) Hot air circulation oven, the temperature should be controlled at the test temperature of 100 ℃, 130 ℃, 150 ℃, 175 ℃,.200 ℃, tolerance
Within the range of ±2 ℃;
c) Test device, see Table 1, and test device diagram in Appendix B;
d) A magnifying glass with 10 times magnification;
e) Electronic balance, accurate to 0.0001 g.
4 materials
The following materials are used in this test.
a) Glassware cleaning fluid. any suitable for laboratory glassware cleaning and can remove stains left over from the last test in the glassware
Can be used with cleaning fluid for sediment;
b) Distilled water or deionized water. meet GB/T 6682 level 3 requirements;
c) Petroleum ether (reagent grade). the distillation range is 40 ℃～60 ℃ or 30 ℃～60 ℃;
d) Sample. The materials of the required sample are shown in Table 2.The size of the sample meets the requirements of SAE AS568 No. 113 O-ring;
e) Lubricants to be tested. 350 ml of lubricating oil is required for each group of lubricating oil-elastomer test.
5 Preparation of equipment
5.1 Clean the test tube as follows.
a) Clean glassware with a cleaning solution that meets the requirements of item a) in Chapter 4;
b) Rinse glassware thoroughly with distilled or deionized water, and dry it in a hot air circulating oven.
5.2 Prepare the O-ring according to the following steps.
a) Clean the O-ring with petroleum ether;
b) For different O-rings, set the corresponding hot air circulation oven temperature according to Table 3, and keep the oven temperature constant. Place the O-ring
Keep it on the heating tray of the oven for 60 min ± 5 min;
c) After the drying is over, take the O-ring out of the oven and store it in a desiccator to avoid direct sunlight. O-ring in the dryer
Cool down for at least 3 h.
6 Procedure
6.1 Weight change test
6.1.1 General
The compatibility test of each group of lubricants and elastomers requires 3 identical O-rings to be tested. All 3 samples shall be in accordance with 6.1.2～6.1.5
carry out testing.
6.1.2 Initial weight test
6.1.2.1 Prepare the test sample according to 5.2.
6.1.2.2 Weigh the sample in air to the nearest 0.0001 g, and record the weight value (Wo).
6.1.3 Test process
6.1.3.1 Set the heating device temperature according to Table 3 to gradually reach equilibrium.
6.1.3.2 Pass the glass rod through the cork through the small hole, so that when the cork is at the mouth of the test tube, the hook at the lower end of the glass rod is at 50 ml
The middle position between the scale line and the bottom of the tube.
6.1.3.3 Take out the cork stopper and glass rod, and pour the lubricating oil to be tested into the test tube until the liquid level is at the 50 ml mark line.
6.1.3.4 Hang the O-ring on the hook of the glass rod and slowly immerse it in the lubricating oil. Make sure that the O-ring does not fall off the hook during the immersion process.
Fall off. After the sample is completely immersed in lubricating oil, fix the cork at the nozzle.
6.1.3.5 Place the test tube in the heating device for testing.
6.1.3.6 Take another test tube, add the lubricating oil to be tested into the test tube until the liquid level is at the 50 ml mark, and keep it at room temperature.
Cool down the O-ring described in 6.1.4.2.
6.1.4 24 h weight test
6.1.4.1 After the test tube is heated for 24 hours, remove the test tube from the heating device.
6.1.4.2 Quickly move the cork, glass rod and O-ring to the test tube prepared according to 6.1.3.6, and let it stand for 30 min ± 5 min.
6.1.4.3 Take out the O-ring from the test tube and clean it with petroleum ether. After cleaning, dry it at room temperature or absorb it with absorbent paper or cloth.
6.1.4.4 Weigh the O-ring in the air to the nearest 0.0001 g, and record the weight value (Wi).
6.1.4.5 Place the weighed O-ring on the hook again and immerse it in the test tube of the lubricant to be tested used in 6.1.4.1.
6.1.4.6 Put the test tube back into the heating device and continue the test.
6.1.4.7 Place the test tube prepared in accordance with 6.1.3.6 in a dark place again.
6.1.5 120 h weight test
After the cumulative heating time reaches 120 h, remove the test tube from the heating device, and repeat the operations of 6.1.4.2 to 6.1.4.3.Weigh in the air
Measure the O-ring to the nearest 0.0001 g, and record the weight value (Wf).
6.2 Brittleness performance test
6.2.1 Evaluate the embrittlement performance of any O-ring weighed in accordance with 6.1.5 according to the following steps.
a) Pinch the O-ring into the shape of the number "8", observe under a 10x magnifying glass for 5 s, and check whether the O-ring has cracks;
b) If the O-ring has no cracks, hang the O-ring back to the hook, plug the test tube tightly with a cork, put it back into the heating device, and proceed to 6.2.2
And record that the O-ring has passed the 5 d test;
c) If the O-ring has obvious cracks or breaks, prepare a new O-ring according to the requirements of 5.2, and perform the operations in 6.1.3 and 6.2.2.
Made.
6.2.2 Check the O-ring for cracks according to the following steps every day.
a) Take out the cork stopper, glass rod and O-ring from the test tube, absorb oil stains with absorbent paper or cloth, and cool the O-ring to room temperature;
b) Repeat the operation in 6.2.1a);
c) If the O-ring has cracks, record the number of days from the start of the test to the occurrence of cracks;
d) If by the eighth day of the test, the O-ring still has no cracks, pour off the lubricating oil in the tube, replace it with a clean test tube, and press 6.1.3.2~
Operate as required in 6.1.3.4, and then heat. Perform 6.2.2a) ~ 6.2.2c) operations every day.
6.2.3 Repeat the operation in 6.2.2 until the O-ring cracks or the test is carried out to the fifteenth day.
6.2.4 If there is no crack in the O-ring after 15 d, end the test and record the cracking time greater than 15 d.
7 Calculation
7.1 Calculate the weight change rate (R) of each O-ring after immersing for 24 h and 120 h according to the following formula.
7.2 Calculate the arithmetic average of the weight change rates of 3 O-rings in each test.
8 reports
The report should include the following.
--Lubricants and elastomers used for testing;
--24 h and 120 h O-ring weight change rate, accurate to 0.5%;
--O-ring cracking time, in days (d) as the unit (for example, if the O-ring cracked on the fourteenth day, the report result is
14 d; if there is no crack in the O-ring on the fifteenth day, the report result is greater than 15 d).
9 Precision
9.1 Repeatability
The same operator in the same laboratory, using the same instrument, the difference between the two test results measured on the same sample should not be more than 0.5%.
9.2 Reproducibility
Different operators in different laboratories use different instruments, and the difference between the two test results measured on the same sample should not exceed 0.5%. MH
Appendix A
(Normative appendix)
Heating device requirements
A.1 Heating device
Any device that meets the requirements of A.2.1 and has space for the test utensils in Appendix B can be used.
A.2 Temperature control and recording
A.2.1 The electronic temperature controller should be able to keep the temperature of the lubricating oil to be tested within ±1.0 ℃ of the specified temperature, and any two lubricating oils to be tested
The temperature difference between them is within 2 ℃.
A.2.2 Appropriate devices should be used to record real-time temperature data during the test.
Appendix B
(Normative appendix)
Elastomer compatibility test test device
Unit is mm
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