GB/T 24747-2023 English PDF (GBT24747-2023)

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GB/T 24747-2023: Safety technology conditions for organic heat transfer fluid
GB/T 24747-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.060.30
CCS J 98
Replacing GB/T 24747-2009
Safety Technology Conditions for Organic Heat Transfer
Fluid
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: MAY 23, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 7
4 General Requirements ... 8
5 Requirements and Test Methods for Quality Indexes ... 9
6 Determination and Disposal ... 11
7 Inspection Cycle and Sampling ... 13
8 Mixed Use ... 14
9 Separation and Disposal of Deteriorated Material ... 15
10 Cleaning of Heat Transfer System ... 15
11 Replacement and Abandonment ... 15
Appendix A (normative) Determination of Acid Value of Organic Heat Transfer Fluid
(by potentiometric titration method) ... 17
Safety Technology Conditions for Organic Heat Transfer
Fluid
1 Scope
This document specifies the safety technology conditions for organic heat transfer fluids used
by various types of boilers and heat transfer systems with organic heat transfer fluids.
This document is applicable to organic heat transfer fluids that use various organic heat transfer
fluid boilers, photothermal energy storage or other heating equipment as heating sources and
for the purpose of indirect heating. It is inapplicable to organic heat transfer fluids that are only
used for freezing and cryogenic cooling, nor is it applicable to organic silicone heat transfer
fluid.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 261 Determination of Flash Point - Pensky-Martens Closed Cup Method
GB/T 265 Petroleum Products - Determination of Kinematic Viscosity and Calculation of
Dynamic Viscosity
GB/T 4756 Method for Manual Sampling of Petroleum Liquids
GB/T 6536 Standard Test Method for Distillation of Petroleum Products at Atmospheric
Pressure
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 11133 Standard Test Method for Determination of Water in Petroleum Products,
Lubricating Oils, and Additives - Coulometric Karl Fischer Titration 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 23800 Heat Transfer Fluids - Determination of Thermal Stability
3.5 liquid phase organic heat transfer fluid
Liquid phase organic heat transfer fluid is a synthetic organic heat transfer fluid and mineral oil
organic heat transfer fluid with a certain distillation range, which can only be used under liquid
phase conditions.
[source: GB 23971-2009, 3.6, modified]
3.6 maximum working temperature
Maximum working temperature is the maximum temperature of the main fluid of the organic
heat transfer fluid allowed at the boiler outlet under the actual operating conditions of the heat
transfer system.
NOTE: the average main fluid temperature of the organic heat transfer fluid measured at the boiler
outlet is the working temperature.
[source: GB 23971-2009, 3.9, modified]
3.7 initial boiling point; IBP
Initial boiling point is the temperature point, at which, the cumulative area is equal to 0.5% of
the total area of the obtained chromatogram when the petroleum fractions boiling range step-
by-step method is used for determination.
NOTE: the determination of boiling range distribution of petroleum fractions adopts NB/SH/T
0558.
3.8 low-boiling component
Low-boiling component is the substance whose distillation temperature in the organic heat
transfer fluid in use is lower than its initial boiling point when it is unused.
3.9 deteriorated material
Deteriorated material is a general term for substances different from the original properties of
the organic heat transfer fluid and generated under the influence of factors, such as: oxidation,
overheating and mixture of foreign matters, on the organic heat transfer fluid in use.
4 General Requirements
4.1 The organic heat transfer fluid products shall comply with the requirements of GB 23971.
The following documents, for example, product quality certificate, shall be provided at the same
time when the organic heat transfer fluid products are sold.
a) Product type test report that complies with GB 23971 and issued by the organic heat
transfer type test institution.
b) Exit-factory quality inspection report of the batch of products issued by the
manufacturer; if the supplier provides a copy of the report, the authenticity of the
report shall be confirmed by the supplier.
c) Safety data sheet for chemical products that complies with the requirements of GB/T
16483.
4.2 The self-ignition point of the organic heat transfer fluid shall not be lower than the maximum
permitted bulk temperature.
4.3 The maximum permitted bulk temperature of the organic heat transfer fluid shall be at least
10 C higher than the maximum working temperature of the organic heat transfer fluid boiler.
For electric heating boilers, coal-fired boilers or boilers with an average heat flux density
greater than 0.05 MW/m2 on the radiant heating surface of the furnace, the maximum permitted
bulk temperature of the selected organic heat transfer fluid shall be at least 20 C higher than
the maximum working temperature of the organic heat transfer fluid boiler.
4.4 The organic heat transfer fluid at any point in the heat transfer system shall not exceed the
maximum permitted film temperature of the organic heat transfer fluid; the calculated
maximum film temperature of the organic heat transfer fluid boiler shall not be higher than the
maximum permitted film temperature of the organic heat transfer fluid.
4.5 L-QC and L-QD organic heat transfer fluids shall be used in closed circulation systems; L-
QB organic heat transfer fluid can be used in closed or open circulation systems, but the thermal
oxidation stability index of the organic heat transfer fluid used in the open circulation system
shall be qualified, and the temperature of the organic heat transfer fluid in the expansion tank
of the open circulation system shall be lower than 70 C during normal operation. See GB
23971 for the classification of L-QB, L-QC and L-QD.
4.6 The organic heat transfer fluids shall not be directly used to heat or cool oxidizing chemicals.
The organic heat transfer fluids used for indirect heating in the production of food or medicine
shall not only comply with the stipulations of GB 23971, but also satisfy the requirements of
relevant national safety standards on food and medicine.
5 Requirements and Test Methods for Quality Indexes
5.1 Verification Indexes and Test Methods for Unused Organic Heat Transfer
Fluid
Before the unused organic heat transfer fluid is injected into the system (including the unused
organic heat transfer fluid initially injected into the system and the unused organic heat transfer
fluid replaced or supplemented after operation), a quality verification inspection...