The surface load of the FJ-63 flanged electric heating tube is determined according to the design standard of 0.7W/cm², making it suitable for static or low-speed flowing liquid heating scenarios with clear requirements for the medium temperature rise rate. At this power density, a reasonable difference is maintained between the element surface temperature and the medium temperature, which helps slow down the scaling tendency. During design selection, the total required power must be calculated based on the type of heated medium, initial temperature, target temperature, and vessel heat dissipation conditions, and then the quantity and arrangement should be determined in combination with the developed length of a single element.
The flange specification, tube diameter, and developed length should match the opening size of the vessel containing the heated medium. Before ordering, the standard flange nominal diameter, pressure rating, and sealing face type of the vessel opening must be provided to determine the flange outer diameter, bolt hole center distance, and bolt hole diameter. The tube diameter is usually selected according to power density and medium flowability, with a common range of 8 mm to 16 mm; the developed length refers to the effective heating section length of a single tube from the flange sealing face to the end, and this length affects the power per element and the installation depth. The distribution of multiple tubes on the flange should ensure mutual spacing to avoid excessively high local heat flux density.
Before installation, the matching dimensions of the flange and vessel opening should be verified, and the gasket material should be confirmed to be compatible with the medium. The tube insertion depth should allow the effective heating section to be fully immersed in the medium, avoiding the occurrence of dry-burn areas. The wiring cavity should face the side convenient for maintenance, and the seals must be ensured to be intact. For vertical installation, attention should be paid to the thermal expansion allowance of the tube at high temperature, and sufficient space should be reserved. After installation is completed, check the insulation resistance and grounding continuity according to electrical specifications, and only energize after confirming there are no issues.
This model of electric heating tube is suitable for heating and maintaining the temperature of water, oils, and some weakly corrosive liquids, and is commonly used in storage tanks, tanks, and pipeline heat tracing systems. It is not suitable for scenarios involving direct contact with flammable and explosive media; for such scenarios, products with corresponding explosion-proof structures should be selected. During selection, if the medium has a scaling tendency, it is recommended to evaluate the adaptability of the surface load in conjunction with a regular maintenance plan.
