Shandong Huaning Electric Heating Technology Co., Ltd.
Precautions for the installation and use of electric heating cables in explosive gas environments
In the mass production and use of electric heating cables, it is especially important to pay attention to the installation and use of electric heating cables in explosive gas environments.
Feb 27,2023
As an effective measure of pipeline insulation and anti-freeze protection, electric heating cable is widely used in many fields, such as electric power, steel, oil, chemical industry, fire protection, etc. D. It has become a key national promotion due to its advantages of high thermal conductivity. Efficiency, energy saving and environmental protection, simple design and convenient installation. In the mass production and use of electric heating cables, it is especially important to pay attention to the installation and use of electric heating cables in explosive gas environments.
The electric heating system is mainly composed of power supply, electric heating cable, temperature controller, junction box, back and other components. The electric heating cable and the necessary components must first meet the requirements of GB 3836.1-2010. When the junction box, tail and other components are used as independent components, they must meet the requirements of one or more explosion-proof types. Are listed in the GB 3836.1-2010 standard. Electric heating cables are the main heating equipment Special standards for electric heating cables used in explosive environments include: "GB/T 19518.1-2017 Resistive heaters for explosive environments, Part 1: General requirements and test requirements", "GB/T 19518.2-2017. Resistance electric satellites for explosive environments, part 2: Design, installation and maintenance manual.
Differences in System Equipment Implementation
The electric heating system usually consists of a junction box, a distribution cable, an electric heating cable and its accessories. Accessories include: power junction box, intermediate junction box (double-sided or three-sided), terminal junction box, etc. D. The basic composition of the electric heating system is shown in the figure below.
The system features two forms:
1. Suitable for entering distribution cables. (The inner hole of the sealing ring is round)
2. Suitable for the electric heating cable input device. (The inner opening of the sealing ring is in the form of a flattened rod suitable for an electric heating cable)
In engineering practice, the component systems must be properly selected and properly installed according to the requirements of the equipment operating instructions. It is strictly forbidden to inject and deduct the distribution cable through an input device suitable for an electric heating cable, or to inject and deduct the electric heating cable through an input device suitable for the distribution cable.
Grounding
1 The metal shielding layer of the electric heating cable shall be securely connected to the protective ground (PE) line of the power supply in the power supply distribution box.
2. The metal shielding layer between the electric heating cables shall be securely connected in the intermediate junction box (two-way or three-way).
3. In the distribution box, the bare wire of the heating cable and the grounding metal shielding layer should be further insulated to prevent leakage or short circuit.
4. The metal shielding layer of the electric heating cable with the outer shielding layer shall be securely connected to the outer grounding connector of the junction box, and the outer grounding shall be securely connected to the grounding system in the explosive area, and the grounding resistance shall not exceed 4 ohms.
qualification
Electric heating cables and their system fittings used in explosive environments must have explosion protection certificates and mandatory product certification (CCC certification, etc.).
Related Posts
Electrical heating installation precautions
Electric heating cable is a heating method that uses insulation resistance or resistance heating wire to create a temperature after power supply. It can automatically adjust the output temperature and reasonably maintain the process temperature requirements to keep warm, raise the temperature and protect the heating equipment from freezing. The insulation and antifreeze effect of the container is very good.
Which electric heating should be chosen for the main pipeline transport of heavy oil
Transport of heavy oil through the pipeline over long distances and long-term retention in the pipeline will result in a drop in temperature due to heat dissipation and increased viscosity, which will cause the pipeline to be blocked by freezing or condensation-related accidents. Electric heating is widely used as effective insulation of pipelines and anti-freeze protection.
Which electric heating cable should be considered for a 4 km pipeline
According to the statistics of the Hydrometeorological Center, the average daily minimum temperature at the location of the CNPC tank farm is 5 ° C, and the average daily maximum temperature is 14 ° C. Since the freezing point of the PX is about 15 °C, the supply pipeline needs heat preservation and heating. The oil depot has been in operation for many years without a stable source of steam, therefore, this project is considering the use of electric heating technology.
Application of outdoor electric heating cable in oil main pipelines with high paraffin content
Long-distance crude oil pipelines with a high paraffin content with freezing temperatures above 50 °C. According to the requirements of the production plan of the plant, the volume of oil transportation through the pipeline is 150 thousand rubles. Tons per year, maximum-200 thousand. Tons per year.. According to the thermodynamic analysis of the pipeline, the initial supply temperature of the pipeline is 80 ° C (TN), and the temperature of the end entering the tank is 60 ° C (Tu). Since the transportation temperature needs to be adjusted according to the time of year, it sometimes needs to be transported by heat.
What heating product to choose for main infusion pipelines
In petrochemical engineering, trunk infusion pipelines are the lifeblood of the factories. The temperature in the northern region is too low in winter and the pipeline needs to be insulated to compensate for the heat loss due to the low temperature in winter to ensure the normal operation of the pipeline.
The role of leather tracer cables in the insulation of asphalt main pipelines
The toughness of the asphalt is greatly affected by the temperature. When the temperature decreases, the toughness of the asphalt increases, and the drop in resistance of the asphalt during pipeline transportation increases; when the temperature falls below the freezing point, the asphalt solidifies, causing the pipeline to clog and the conveyor belt to come to trouble. Therefore, electric heating and heat preservation during the transportation of asphalt are very important.
Need help to find the right solution with our experts?
WhatApp:
E-mail:
Address:
Xinxing Street, Industrial Park, Shanghe County, Jinan City, Shandong Province
✪ Huaning Electric Heat Tracing provides you with professional solutions
