Malfunction and methods of treatment of electric heating on the offshore oil well platform
To ensure the normal operation of the electric heating system, the electric heating system of the piping shall be used for preventive inspection at least twice a year, the constant temperature induction system shall be checked regularly before the cold season, and the heating wires, accessories, insulation layers shall be checked, or the waterproof coating shall be repaired and replaced immediately if damaged. Common faults, possible causes and solutions:
The first kind of fault and the way it is treated
The phenomenon of the fault is that the heat output of the system is normal, but the temperature of the pipeline is below the calculated value. Possible reasons: the insulation layer is wet, the thermostat regulator is not adjusted correctly, the parameters used in calculating the heat loss do not correspond to each other. Treatment method: Replace the wet insulation layer with a dry layer and add a waterproof coating, adjust the thermostat regulator again, recheck the calculation parameters and make the necessary adjustments.
The second kind of fault and method of its treatment
The phenomenon of failure is that the electric heating belt is poorly used, the warranty period is exceeded, the defrost time is extended or the ambient temperature is too low, and the antifreeze effect is poor. Possible reasons: poor product selection or low technical parameters; too thin insulation layer or no waterproofing, so that the heating belt works for a long time at low temperature and high power, and the attenuation factor is too large. Processing method: According to the manual, preliminary design and product selection; thickening of the insulation layer (30-50mm) and good waterproofing work, so that the electric heating belt can work in a dry condition; choose quality products from famous brands.
The third type of fault and its treatment method
The phenomenon of fault is that the electric heater belt is not hot or the heating and cooling are uneven. This can be: lack of insulation; the insulation layer is too thin or uneven in thickness; power work, serious loss of energy costs. Treatment method: choose the electric heating belt from the ordinary manufacturer that was in operation, with the correct certificates and marked nameplate, various technical indicators and dates of manufacture, make insulation, install it according to the product instruction, and make the waterproofing layer according to authority. Temperature message layer to make the electric heating belt work in a dry state.
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.
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.
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.
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.
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 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.
To solve many problems in the "three high levels" crude oil extraction process, the thermal energy generated by the electric heating is used to heat the crude oil in the oil pipe throughout the process to improve the fluidity of the crude oil. Effectively solve various technical problems encountered in the operation of high-condensation, high-viscosity and high-paraffin crude oil, and achieve the goal of improving the productivity and efficiency of oil wells.