Selection of electric heating system type of antifreeze ventilation pipeline of the main tank

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2023-05-18 13:59

The air pipe of the ballast water tank is generally carried out of the cabin, and during the voyage of the polar cruise ship, the sea water will inevitably splash out onto the deck, and due to the low temperature it is easy to freeze at the mouth. An air pipe outside the cabin, as a result of which the gas cannot escape, resulting in excess pressure in the ballast water tanks, creating a risk of explosion. Therefore, it is especially important to formulate a reasonable system plan for freezing protection of the liquid tank ventilation pipeline.

When choosing an electric heating cable, the following factors are mainly taken into account: ambient temperature, including the highest ambient temperature and lowest ambient temperature; maintenance temperature required by the heated object; insulation material and insulation layer thickness; heat transfer coefficient; pipeline material, length. And Pipeline Number of reinforcement. In addition, the actual environment of the electric heating pipeline should be considered, including whether it is indoors or outdoors, outdoor wind speed, whether it is installed in an explosion-proof area, and whether aggressive gas (liquid) is present. In the place of installation.

Pipeline characteristics of polar cruise ships: complex direction, large number of fittings and fittings on the pipeline, many workarounds. If you choose to use a constant power heating cable, it can cause local overheating at the intersection of the heating cable and even pose a safety hazard. Thus, the type of heating cable that can be selected is a heating cable with automatic temperature control. The principle of choosing an electric heating system is that the heat generated by the selected electric heating cable is able to compensate for the heat loss of the heated object to maintain a certain temperature.

A full electric heating system usually includes the following components: 1) a heating cable (self-regulating, limited power, parallel port of constant power or serial constant power); 2) a kit for power connection; 3) a sensor or control thermostat; 4) T-connecting box shaped, three-way connecting box (Allowing two or three cables to be spliced together), tail connection box, 5) cable fitting, 6) adhesive tape (used according to specification specifications or requirements); 7) "electrical accompanying" thermal "labels (adhesive labels, attached to the insulated steam insulator at 10 intervals or in accordance with regulations or specifications); 8) Insulation and moisture insulation. The design scheme of the electric heating system for the pipelines of polar cruise ships tanks is presented in the figure.

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