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GB 24747-2009 English PDF (GB24747-2009)

GB 24747-2009 English PDF (GB24747-2009)

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GB 24747-2009: [GB/T 24747-2009] Safety technology conditions for heat transfer fluids

This Standard specifies the terms and definitions, general requirements, quality indicators and test methods, determination and disposal, inspection cycle and sampling, mixing, recycling for various types of heat transfer fluid boiler and its heat transfer system; as well as cleaning, replacement and rejection of heat transfer systems. This Standard is applicable to heat transfer fluids that use various heat transfer fluid boiler as heating equipment for indirect heating, and is not applicable to heat transfer fluid that are only used for freezing and low-temperature cooling.
GB/T 24747-2009 (Renamed from GB 24747-2009)
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 27.060.30
J 98
GB 24747-2009
Safety Technology Conditions for Heat Transfer Fluids
ISSUED ON: OCTOBER 30, 2009
IMPLEMENTED ON: JUNE 01, 2010
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the PEOPLE Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 General Requirements ... 8
5 Quality Index and Test Methods ... 9
6 Judgment and Disposal ... 10
7 Inspection Cycle and Sampling ... 12
8 Mixed Use ... 13
9 Recycling ... 14
10 Cleaning of the Heat Transfer System ... 14
11 Replacement and Disposal ... 14
Appendix A (Normative) Determination Method of Acid Value of Heat Transfer Fluids (Potentiometric Titration Method) ... 16
Safety Technology Conditions for Heat Transfer Fluids
1 Scope
This Standard specifies the terms and definitions, general requirements, quality indicators and test methods, determination and disposal, inspection cycle and sampling, mixing, recycling for various types of heat transfer fluid boiler and its heat transfer system; as well as cleaning, replacement and rejection of heat transfer systems.
This Standard is applicable to heat transfer fluids that use various heat transfer fluid boiler as heating equipment for indirect heating, and is not applicable to heat transfer fluid that are only used for freezing and low-temperature cooling.
2 Normative References
The provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.
GB/T 259 Petroleum Products - Determination of Water-Soluble Acids and Alkalis GB/T 261 Determination of Flash Point - Pensky-Martens Closed Cup Method (GB/T 261- 2008, ISO 2719:2002, MOD)
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 1884 Crude Petroleum and Liquid Petroleum Products - Laboratory Determination of Density - Hydrometer Method (GB/T 1884-2000, eqv ISO 3675:1998)
GB/T 1885 Petroleum Measurement Tables (GB/T 1885-1998, eqv ISO 91-2:1991) GB/T 4756 Petroleum Liquids - Manual Sampling (GB/T 4756-1998, eqv ISO 3170:1988) GB/T 6536 Petroleum Products - Determination of Distillation (GB/T 6536-1997, eqv ASTM D86-95)
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods (GB/T 6682-2008, ISO 3696:1987, MOD)
GB/T 11133 Liquid Petroleum Products-Determination of Water-Karl Fischer Reagent Method
GB/T 11137 Black Petroleum Products. Determination of Kinematic Viscosity (Reverse- Flow Method) and Calculation of Dynamic Viscosity
GB/T 16483 Safety Data Sheet for Chemical Products - Content and Order of Sections GB/T 17144 Petroleum Products - Determination of Carbon Residue - Micro Method (GB/T 17144-1997, eqv ISO 10370:1993)
GB/T 23800 Heat Transfer Fluids - Determination of Thermal Stability (GB/T 23800-2009, DIN 51528:1998, MOD)
GB 23971-2009 Heat Transfer Fluids (DIN 51522:1998, MOD)
SH/T 0170 Petroleum Products - Determination of Carbon Residue (Electric Furnace Process)
SH/T 0246 Determination Method for Water Content in Light Petroleum Products (Coulometric Method)
SH/T 0558 Standard Test Method for Boiling Range Distribution of Petroleum Fractions (Gas Chromatography)
SH/T 0604 Crude Petroleum and Petroleum Products-Determination of Density- Oscillating U-Tube Method
3 Terms and Definitions
For the purposes of this Standard, the following terms and definitions apply. 3.1 Heat transfer fluids
The generic term for organic substances that are used as heat transfer media. NOTE: Heat transfer fluids include all organic media that is used for indirect heat transfer purposes such as heat transfer fluids, hot oils, organic heat transfer media, heating media, etc. According to chemical composition, it can be classified into synthetic heat transfer fluids and mineral heat transfer fluids. According to boiling range, it can be classified into vapor phase heat transfer fluids and liquid phase heat transfer fluids.
3.2 Unused heat transfer fluids
Heat transfer fluids that have not been injected into the heat transfer system for use. Under the operating conditions of the heat transfer system, the average main fluid temperature of the heat transfer fluids measured at the boiler outlet is the working temperature; while the maximum main fluid temperature of the heat transfer fluids allowed at the boiler outlet is the maximum working temperature.
3.11 Maximum permitted film temperature
The liquid film temperature refers to the temperature in the boundary layer of the heat transfer fluids in contact with the heating surface of the boiler; the maximum permitted film temperature is the maximum permitted temperature where the heat transfer fluids contact the heating surface of the boiler.
3.12 Calculated maximum film temperature
In the design of the heat transfer fluid boiler, the maximum film temperature of the boiler is calculated according to the maximum design area heat flux density in the furnace and the design heat exchange conditions of the heat transfer fluids in the furnace tube. 3.13 Initial boiling point (IBP)
The temperature point, using the petroleum fraction boiling range distribution method for testing, and the accumulated area is equal to 0.5% of the total area of the obtained chromatogram.
NOTE: The determination of the boiling range distribution of petroleum fractions adopts SH/T 0558. 3.14 Components with low boiling point
The substance that is distilled from the heat transfer fluids in use, with the temperature less than the initial boiling point of the unused heat transfer fluids.
3.15 Bulk temperature at the inlet of boiler
The average main fluid temperature of the heat transfer fluids in use in the system return that is measured at the boiler inlet.
3.16 Quality index
An index that is used to define the quality status of heat transfer fluids in use. NOTE: According to its quality status, the quality index of the heat transfer fluids in use are divided into permitted use quality index, safety warning quality index and stop-use quality index. 3.17 Closed heating system
The heat transfer system of heat transfer fluids in which the expansion tank is isolated from the atmosphere.
NOTE: Closed systems usually use inert gas or cold oil liquid seals to isolate the expansion tank from the atmosphere.
3.18 Opening heating system
The heat transfer system of heat transfer fluids in which the expansion tank communicates with the atmosphere.
4 General Requirements
4.1 Heat transfer fluid products shall meet the requirements of GB 23971-2009. The heat transfer fluid supplier shall provide the following product quality certification materials: a) The type test report of the product issued by a testing agency and recognized by the national competent authority.
b) The exit-factory quality inspection report of the batch of products issued by the manufacturer. If a copy is provided by the supplier, the authenticity of the report shall be confirmed by the supplier.
c) The safety data sheet for chemical products that meets the requirements of GB/T 16483. 4.2 For heat transfer fluid products with additives, in addition to meeting the requirements of 4.1, the type of added additives and relevant product information shall also be provided, as well as the following certification materials issued by a testing agency and recognized by the national competent authority:
a) Test report of thermal stability of heat transfer fluids before and after adding additives, measured by the method of GB/T 23800;
b) Test report of thermal oxidation stability of heat transfer fluids before and after adding additives, measured by the method in Appendix C of GB 23971-2009.
4.3 The maximum permitted bulk temperature of the heat transfer fluids shall be at least 10??C higher than the maximum working temperature of the heat transfer fluid boiler, and its auto- ignition point shall be no lower than the maximum permitted bulk temperature. For the case where the design average area heat flux density of the coal-fired boiler or the radiant section of the boiler is equal to or greater than 50kW/m2, the maximum permitted bulk temperature of the heat transfer fluids shall be 20 ??C higher than the maximum working temperature of the heat transfer fluid boiler.
4.4 The maximum permitted film temperature of the heat transfer fluid is the temperature that the heat transfer fluids in any part of the heat transfer system shall not exceed. The calculated maximum film temperature of the heat transfer fluid boiler shall be no higher than the maximum permitted film temperature of the heat transfer fluids.
4.5 L-QC and L-QD heat transfer fluid materials shall be used in closed circulation systems; L- b) When the heat transfer fluids in use discharged from the system are re-injected into the system;
c) After taking appropriate measures to improve the quality of the heat transfer fluids that are confirmed to stop using, before intending to continue to be used;
d) Within 3 months after the system is replaced or mixed with different heat transfer fluid products.
7.2 Sampling
7.2.1 Sampling of the unused heat transfer fluids shall meet the requirements of GB/T 4756; and the sampling volume shall meet the requirements retained samples for verification inspection and subsequent re-inspection; and the retained sample volume shall be no less than 2L.
7.2.2 The sampling of the heat transfer fluids in use shall be carried out through the sampling cooler in the circulation loop of the system; the temperature of the taken sample shall be no higher than 50 ??C; and the taken sample shall be representative of the quality of the average samples of the heat transfer fluids in use. The sampling volume shall meet the requirements of the retained samples for inspection and re-inspection. The retention time of the re-inspection samples shall be no less than 40 days.
8 Mixed Use
8.1 Vapor phase heat transfer fluids with different chemical compositions shall not be mixed; and vapor phase heat transfer fluids and liquid phase heat transfer fluids shall not be mixed. 8.2 Generally, heat transfer fluids with different chemical and physical properties shall not be added to the same system for mixed use.
8.3 If it is necessary to mix synthetic liquid phase heat transfer fluids with mineral heat transfer fluids, or mix synthetic liquid phase heat transfer fluids of different chemical compositions, and mix mineral heat transfer fluids produced by different manufacturers, the following requirements shall be met:
a) It shall pass the thermal stability inspection of GB/T 23800, and have equivalent or higher thermal stability than the original heat transfer fluids in use;
b) Meet the requirements of Clause 4 of this Standard;
c) The verification inspection specified in Table 1 shall be passed before adding; d) The manufacturer or supplier shall ensure that the mixed heat transfer fluids can be used safely.
8.4 The quantity and mixing ratio of the mixed heat transfer fluids added to the heat transfer system shall be accurately recorded; meanwhile the mixed heat transfer fluids shall be sampled and 2L of the reinspection sample shall be retained.
8.5 The mixed heat transfer fluids shall be used in accordance with the properties and performance conditions of the original heat transfer fluids in use, and its quality index shall meet the requirements of Table 2.
9 Recycling
9.1 For the heat transfer fluids in use that still has the value of recycling, distillation, filtration and hydrofining can be used for recycling to remove the pollutants and part of the metamorphic substances; so that the quality can be improved to a certain extent. After reaching the permitted quality index, it can be returned to the original system to continue to use. 9.2 In the recycling process, acid-base neutralization shall not be used to reduce its acid value, nor shall other chemical additives be added to change its physical properties. 10 Cleaning of the Heat Transfer System
10.1 When the heat transfer fluids in the system is seriously polluted, or an overheating and overtemperature accident occurs in the boiler tube, and before the system replaces the heat transfer fluids, the boiler and system shall be inspected. If coking has been produced or the residual oil is seriously adhered, appropriate cleaning methods shall be used to remove the pollutants in the system and the coke in the furnace tube to keep the system clean and avoid pollution of the newly replaced heat transfer fluids.
10.2 Cleaning of the heat transfer fluids system shall not use cleaning media that pollute the heat transfer fluids or cause corrosion hazards to system materials.
10.3 After the heat transfer fluids is injected into the cleaned system and exhausted and dehydrated, it shall be sampled for inspection; and its quality shall meet the quality index permitted to use in Table 2.
11 Replacement and Disposal
11.1 When the kinematic viscosity, acid value, carbon residue or pollution degree of the heat transfer fluids in use is within the range of the "quality index stopped to use" in Table 2, and it is difficult to effectively recycle it to the quality index permitted to use, all or partial heat transfer fluids shall be replaced.
11.2 The replaced heat transfer fluids shall be disposed of in accordance with the laws and regulations of the national safety and environmental protection department on the disposal of Appendix A
(Normative)
Determination Method of Acid Value of Heat Transfer Fluids
(Potentiometric Titration Method)
A.1 Overview
A.1.1 This method is applicable to the determination of the acid value of heat transfer fluids. The measurement range of the acid value is: 0 mg/g (by KOH) ~ 30 mg/g (by KOH). A.1.2 This method uses potassium hydroxide (isopropanol) standard solution (hereinafter referred to as KOH standard solution) as the titrant; dissolves the specimen with a mixed solvent of toluene, isopropanol and a small amount of water; passes through the composite electrode or a pair of glass indicator electrode-silver/silver chloride (Ag/AgCl) reference electrode for potentiometric titration. The titration curve is drawn according to the consumption volume of the KOH standard solution and potential value; and the end point is when the curve has an obvious jump point (i.e., the stoichiometric point). Due to the existence of various weak acids in the heat transfer fluids, there are often multiple jump points in the titration process; and the endpoint judgment is based on the jump point corresponding to the potential value of the standard buffer solution closest to pH 11??0.02 to calculate the acid value. If a jump point is not found during the titration, the acid value is calculated by the volume of the standard solution consumed when the electrode is titrated to the electrode in the pH 11??0.02 standard buffer solution to obtain the potential value.
A.2 Instruments
A.2.1 Potentiometric titrator
A.2.1.1 Automatic potentiometric titrator
Basic requirements of automatic potentiometric titrator are as follows: a) The automatic titration system shall be able to meet the setting requirements in A.5.7; b) Motor-driven burette: the accuracy is no less than ??0.001mL;
c) The titrant addition method shall be able to carry out the dynamic addition mode, that is, during the titration process, the addition volume and rate of the titrant shall be able to change with the change of the potential;
d) The measurement method is "balance control mode", and the potentiometric titration curve and the first-order differential curve shall be drawn simultaneously during the automatic titration process;
e) The reagent bottle containing the KOH standard solution shall be provided with a drying tube that can absorb CO2 (such as a drying tube containing soda, soda lime, etc.); f) Mechanical stirrer: program control shall be adopted; and propeller stirrer or magnetic stirrer can be used. The stirring speed shall be able to fully stir the liquid (a vortex is generated, but the liquid shall not be splashed or the air shall be stirred into the solution); g) Titration cup, 100mL volume; made of borosilicate glass or other materials that shall not interact with the heat transfer fluids.
A.2.1.2 Manual potentiometric titrator
Basic requirements of manual potentiometric titrator are as follows:
a) Potentiometer or voltmeter: electrodes comply with the provisions of A.2.2; when the resistance between the two electrodes is between 0.2 M?? and 20 M??, the accuracy of the potentiometer or voltmeter is ??0.5mV, the sensitivity is ??0.2mV, and the range is at least ??500mV.
b) The instrument shall be able to display the potential value or pH value. c) The instrument must be protected against electrostatic fields. The exposed surface of the glass electrode, the wire of the glass electrode, the titration table, the potentiometer, and the terminals of the potentiometer shall be grounded or shielded separately to isolate the external electrostatic field.
d) Micro-burette: the subscale is no more than 0.01mL; the accuracy is no less than ??0.005mL. KOH standard solutions are added directly to the titration vessel through the burette without exposure to ambient air. Burettes containing KOH need to have drying tubes containing soda, soda lime or other substances that can absorb CO2. e) The titration vessel, with a volume of 100mL ~ 250mL, is made of borosilicate glass or other materials that shall not interact with heat transfer fluids.
f) The titration table can reasonably place electrodes, stirrers and burettes. g) Mechanical stirrer: magnetic stirrer or propeller stirrer can be used. The stirring speed shall be sufficient to stir the liquid (a vortex is generated, but no liquid shall be splashed or air shall be stirred into the solution). If an electric stirring device is used, it needs to be properly used and grounded to prevent persistent changes in meter readings when the motor is powered on or off during titration.
A.2.2 Measuring electrodes
A.2.2.1 The measuring electrode shall use a standard pH electrode suitable for non-aqueous titration.
A.2.2.2 Composite electrode. There is an Ag/AgCl reference electrode in the measuring standard solution, the standard solution shall be calibrated frequently (generally at least once a month).
Warning: Reagents such as isopropyl alcohol and toluene are toxic substances, and shall be strictly prevented from entering into mouth or splashing on the skin and eyes. The solution preparation and measurement process shall be carried out in a fume hood; and protective glasses, latex gloves, gas masks, etc. shall be worn.
A.4 Electrode system
A.4.1 Electrode preparation
A.4.1.1 The Ag/AgCl reference electrode used in titration shall use the lithium chloride electrode filling liquid, otherwise it needs to be replaced. The method is as follows: emptying the origina...

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