GB/T 33651-2017 in English
VALIDIn-situ measurements of heat loss through thermal insulation of equipments and pipes -- Infrared image method
- Issued on:2017-05-12
- Implemented on:2017-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$127.00
《GB/T 33651-2017设备及管道绝热层表面热损失现场测定 红外热像法》由TC20（全国能源基础与管理标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
1. Background and significance of the standard
GB/T 33651—2017 specifies the use of infrared thermography to test the surface temperature and heat flux density and their distribution of the insulation layer, and to determine and analyze the heat (cold) loss of the insulation layer. This standard is mainly applicable to the second and third level tests specified in GB/T 8174, as well as on-site evaluation of the insulation performance of equipment and pipeline insulation layers under normal working conditions.
With the continuous improvement of energy efficiency requirements in the industrial field, it is essential to accurately measure and evaluate the heat loss of equipment and pipelines. As an efficient and non-contact detection method, infrared thermography can quickly provide complete heat distribution information and has become an important means of modern insulation performance testing.
2. Comparison of standard frameworks
| Standard dimensions | GB/T 33651—2017 | GB/T 8174—2008 | GB/T 17357—2008 |
|---|---|---|---|
| Scope of application | On-site measurement of surface heat loss of insulation layer of equipment and pipelines, application of infrared thermal imaging method | Comprehensive testing and evaluation of insulation effect of equipment and pipelines | Heat flow meter method and surface temperature method for surface heat loss of insulation layer of equipment and pipelines |
| Core method | Infrared thermal imaging method | Comprehensive test and evaluation | Heat flow meter method and surface temperature method |
| Main indicators | Emissivity, infrared thermal image, reference temperature | Insulation effect, heat loss, test level | Surface temperature, heat flux density |
Note: The data in the table are derived from relevant standard documents, and the comparison dimensions include scope of application, core methods and main indicators.
3. Implementation suggestions and practical applications
3.1 Selection and calibration of test instruments
According to the requirements of the measurement level, the test instruments should be selected to meet the performance parameters required in Table 1. The infrared thermal imager needs to be calibrated in accordance with GB/T19870 and JJF1187 to ensure measurement accuracy and reliability.
| Measurement items | Performance indicators |
|---|---|
| Surface temperature of thermal insulation structure | ±0.5 ℃ |
| Surface temperature of cold insulation structure | ±0.3 ℃ |
| Ambient temperature | ±0.5 ℃ |
| Ambient wind speed | ±10% |
3.2 Control of on-site test conditions
When testing outdoors, measures should be taken to avoid dust and smoke, and measurements should be carried out on cloudy days or at night. If it cannot be met, a sunshade device should be added and the measurement should be conducted after it stabilizes for a period of time. The ambient temperature and wind speed should be measured at a distance of 1 meter from the measuring point, and avoid the influence of other heat sources.
In addition, the infrared thermal imager needs to be turned on and operated for more than 20 minutes to ensure that the internal thermal balance of the instrument is reached before testing.
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