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SH/T 0066-2002 PDF English (SH/T 0066-1991: Older version)Search result: SH/T 0066-2002 (SH/T 0066-1991 Older version)
SH/T0066-2002 (SHT0066-2002): PDF in EnglishSH/T 0066-2002 SH PETROCHEMICAL INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 75.080 E 49 SH/T 0066-2022 Replacing SH/T 0066-1991 Standard Test Method for Foaming Tendencies of Engine Coolants in Glassware ISSUED ON: MAY 31, 2002 IMPLEMENTED ON: JULY 1, 2002 Issued by: State Economic and Trade Commission Table of Contents Foreword ... 3 1 Scope ... 5 2 Normative References ... 5 3 Terms ... 5 4 Overview of Method ... 6 5 Meaning and Usage ... 6 6 Instruments ... 6 7 Reagents and Materials ... 8 8 Test Solution ... 8 9 Test Conditions ... 8 10 Test Procedures ... 9 11 Report ... 9 Appendix A (Standard) Specification of Thermometer ... 11 Standard Test Method for Foaming Tendencies of Engine Coolants in Glassware 1 Scope 1.1 This Standard specifies the method for determining the foaming tendencies of engine coolants using glassware under certain temperature and ventilation conditions controlled in the laboratory. 1.2 This Standard involves some hazardous materials, operations and equipment, but it does not intend to make recommendations on all safety issues related to this. Therefore, users shall establish appropriate safety and protection measures and determine applicable management systems before using the standard. 2 Normative References The following standards include provisions that constitute part of this Standard by reference. Unless otherwise specified in the standard, the following referenced standards shall be the currently valid standards. GB/T 6682 Water for analytical laboratory use - Specification and test methods GB/T 12579 Determination of foaming characteristics of lubricating oils SH/T 0065 Engine coolant for rust preventive agent test sample taking and preparation of aqueous solution ASMT D 3585 Standard specification for ASTM reference fluid for coolant tests 3 Terms For the purposes of this Standard, the follow terms apply. 3.1 Break time The time from gas stop to foam bursting and until an "eye" appears on the liquid surface. 3.2 Eye The bubble-free area surrounded by the foam attached to the wall of the measuring cylinder on the liquid surface. 4 Overview of Method The mixed solution of coolant and water was kept at a constant temperature of 88°C ± 1°C; ventilated with a constant air flow for 5 min; and measure its foam volume and break time. 5 Meaning and Usage In practice, this method is usually used to distinguish coolants with excessive foaming tendency in order to select coolants suitable for further analysis to determine their performance. NOTE: During the use of the coolant, as time goes by or the coolant is contaminated, its foaming tendency shall increase. A certain pressure shall be maintained to inhibit the formation of foam in the coolant. 6 Instruments 6.1 Container: 500mL graduated heat-resistant glass cylinder, the minimum scale is 5mL, the diameter is 45mm ~ 50mm, and the length is 380mm. 6.2 Water bath: 4000mL glass container, which can at least immerse the 350mL scale line of the 500mL measuring cylinder below the liquid surface. 6.3 Heater: An electric heater that can keep the bath temperature at 88°C±1°C. 6.4 Gas diffusion head: 25.4mm in outer diameter; a sand core ball made of sintered crystalline alumina. The following conditions shall be met when measuring according to the Appendix A of GB/T 12579: Maximum pore size/μm: no more than 80 Permeability at 2.45kPa pressure/(mL/min): 3000~6400 6.5 Thermometer 1] meet the requirements of Appendix A, or use a common thermometer with a temperature range of 0°C~100°C and a graduation value of 1°C. 6.6 Air source: A clean and dry air source that is free of grease and other pollution and can ensure the specified gas flow rate through the diffusion head. 6.7 Stopwatch: Graduation value 0.2s. 1] The thermometer specification in ASTM D 1881-97 is given in the Appendix A of this Standard; and add the provision to use domestic common thermometer. 7 Reagents and Materials 7.1 Purity of water: Unless otherwise specified, the water used in the standard is the Grade-2 water specified in GB/T 6682. 7.2 Acetone: Analytically pure, rinse and dry the test instrument. WARNING: Acetone is highly flammable. 7.3 Reference coolant: Unless otherwise specified, the reference coolant refers to the coolant without defoaming agent specified in ASTM D 3585. 7.4 Cleaning solution: refers to the acidic or alkaline cleaning solution used to clean glass containers between tests. It is selected according to the specific situation. For example, chromic acid cleaning solution and sodium (potassium) hydroxide alcohol solution are commonly used acidic and alkaline cleaning solutions, respectively. WARNING: The cleaning solution is a strong oxidant or strong acid or alkali. Avoid contact with skin, eyes, and clothing. Do not inhale steam. It is best to operate in a ventilated cabinet. 8 Test Solution 8.1 Prepare a 33% (V/V) aqueous solution from the reference coolant concentrate. 8.2 Use the glass beaker used to prepare the reference coolant to prepare an aqueous solution containing 33% (V/V) concentrate from the coolant to be tested. Rinse the glass beaker with water before preparing the solution. Dilute the additive concentrate with water to the recommended concentration. Sampling and specimen preparation are carried out in accordance with SH/T 0065 to ensure that the prepared specimen contains all insoluble substances and is representative. 9 Test Conditions 9.1 Test temperature: During the test, the constant temperature water bath liquid level is maintained at the 350mL~375mL scale position of the measuring cylinder; and the test solution temperature is maintained at 88°C ±1°C, which is suitable for both high-boiling point and low- boiling point coolants. 9.2 Air flow: Maintained at 1000mL/min ± 25mL/min. 9.3 Number of tests: The reference coolant is used to determine whether the used glassware and test instruments have residual defoaming agent. If the foam volume of the measured reference coolant is greater than 250mL and the break time is greater than 8s, pour out the reference coolant in the glassware, rinse it with water, and prepare for the test. Each sample is repeatedly tested for three times, and each time a new specimen prepared according to the requirements of Subclause 8.2 is used. The used measuring cylinder and gas diffusion head shall be thoroughly cleaned before each test. The measuring cylinder is cleaned with tap water, cleaning fluid, and water in turn. The gas diffusion head is immersed in acetone and water in turn; and is repeatedly cleaned by suction and compressed air. All test instruments are fully rinsed with water before the test. NOTE: Before each test, wipe the glass measuring cylinder, ventilation pipe and gas diffusion head to remove the residual defoaming agent and glass cleaning fluid from the previous test, because these residues shall affect the reproducibility of the test. 10 Test Procedures 10.1 Place the measuring cylinder containing 145mL of specimen in a constant temperature bath; heat the specimen to 88°C ±1°C; immerse the gas diffusion head in the specimen; make the gas diffusion head just touch the bottom of the measuring cylinder and be located in the center of the measuring cylinder (see Figure 1). When the specimen temperature in the measuring cylinder reaches the test temperature 1], read the initial volume of the specimen, accurate to 5mL. 10.2 Connect the air source, rotate the three-way valve to allow the gas to flow to the ventilation pipe; and use a gas flow meter or other suitable instrument that can accurately measure the air flow to adjust the air flow to 1000mL/min±25mL/min. 10.3 If the specimen evaporates before ventilation and the volume decreases, water shall be added to the initial volume and the specimen temperature shall be brought to the specified temperature. 10.4 When the first bubble appears in the specimen, start timing and ventilate for 5min. 10.5 At the end of 5 min, immediately read the volume of the rising foam, accurate to 5mL; minus the initial volume of the liquid after immersion of the gas diffusion head as the foam volume (mL). 10.6 Rotate the three-way valve to close the air source; and put the air inlet of the ventilation pipe in a venting state; and record the time from stopping the air supply to the gradual break of the foam until the "eye" appears on the liquid surface, as the break time (s), accurate to ±0.2s. 11 Report Take the arithmetic mean of the three results as the measurement result. The test results can be expressed in the following form. 1] The ASTM D 1881-97 standard does not describe the location of the gas diffusion head and the reached test temperature. This Standard still adopts the relevant description in the SH/T 0066-91 standard. .......Source: https://www.ChineseStandard.net/PDF.aspx/SHT0066-2002 |