Electricity accompanies the tropical protection sewage pipe heat preservation

In winter or cold area, the sewage pipe heat preservation and anti-freezing is the key to guarantee the stable operation of municipal and industrial system. Electric accompanied by heat technology by virtue of its accurate temperature control, flexible installation and other advantages, become the sewage pipe insulation “invisible guard”. However, it seems simple behind the application of electric accompanying heat, actually hides from the selection to the maintenance of many technical doorway.

Selection to match the medium and environmental characteristics

Sewage pipe heat preservation and anti-freezing need to be combined with the characteristics of the medium and environmental conditions of scientific selection. If the pipeline contains grease or high viscosity sewage, need to choose high power density of constant power electric accompanied by tropical, ensure that the heat through the pipe wall transfer to the medium; If the pipeline is located in the corrosive environment (such as chemical plant sewage pipe), need to use corrosion-resistant jacket accompanied by tropical, to avoid chemical erosion led to the failure of the insulation layer.

In addition, the cold region need to consider the low temperature start-up ability of the heat tape. The self-limiting temperature electric accompanies the tropical tape to adjust the output power automatically according to the ambient temperature, avoids the low temperature to start the difficulty; And accompanies the tropical tape to bear the highest temperature to be higher than the pipeline medium's highest working temperature, prevents the damage because of the over-temperature. For example, the pipeline which conveys high temperature sewage needs to choose the heat-resistant grade of 150℃ or above to ensure the safe operation.

Installation technology decides to accompany the heat efficiency

The installation process of electric accompanying heat tape directly affects the heat preservation effect of sewage pipe. For vertical or inclined pipeline, need to use spiral winding method, increase the contact area of heat tape and pipeline; Horizontal pipeline can be used parallel and straight, but need to be fixed every 30-50cm with high temperature tape, prevent shift or loose.

Key parts need to focus on protection: valves, flanges and other complex structure of the region, need to use aluminum foil tape wrapped with heat tape, enhance the uniform distribution of heat; pipeline bracket at the need to reserve heat tape bending space, to avoid mechanical extrusion led to insulation layer damage. In addition, accompanied by the tropical outer layer should be installed with waterproof insulation layer (such as rubber insulation cotton), not only to reduce heat loss, but also to prevent external moisture infiltration triggered by short-circuit.

Intelligent temperature control to realize energy saving and safety win-win

Traditional heat tracing system often leads to high energy consumption due to continuous full-power operation, and intelligent temperature control technology can crack this problem. By installing temperature sensors and PID controllers, the system can monitor the pipeline temperature in real time and dynamically adjust the power of the heating tape. For example, when the sewage flow is reduced automatically reduce the heating power to avoid energy waste.

In the safety design, the need to configure multiple protection mechanisms: leakage protection device can quickly cut off abnormal circuit; over-temperature fuse can be fused in the accompanied by tropical local overheating, to prevent fire; explosion-proof accompanied by tropical for the existence of combustible gases in the sewage environment (such as petrochemical plants), to avoid sparks triggered by the explosion. A chemical park case shows that after the introduction of intelligent temperature control system, the sewage pipe heating energy consumption is reduced by 35%, and the failure rate is reduced by 60%.

Operation and maintenance points to extend the system life

The long-term stable operation of electric accompanying heat system depends on regular maintenance. Quarterly need to check the insulation resistance value of the accompanying heat tape, if lower than 50MΩ, it is suggested that the insulation aging, need to be replaced in time; Every year before winter, test the response speed of the thermostat to ensure that it can start and stop normally in -20℃ environment.

Emergency treatment of sudden freeze blockage is also key: if a section of the pipeline temperature is found abnormal, should first cut off the power supply, check whether the accompanying tropical fracture or joint oxidation, rather than blindly increase the power. Daily also need to clean up the snow or water outside the heat preservation layer, prevent the external low temperature to offset the accompanying heat effect. A northern city sewage treatment plant through the “online monitoring + manual inspection” combination of modes, will be accompanied by heat system life from 5 years to more than 8 years.

The electric accompanies the heat belt to guard the sewage pipe heat preservation doorway, not only lies in “the right medicine” the selection design, also can't be separated from the precise installation, the intelligent temperature control and the scientific operation and maintenance. From antifreeze to energy saving, from safety to long-lasting effect, these technical details superposition, let the electricity accompanies the heat to become the sewage system to resist the cold reliable barrier, for the stable operation of the city infrastructure escort.