1. Electric heater installation:
1.1 Before installation, check whether the electric heater equipment that has been transported over long distances has appearance defects, and use a 1000V shaker to measure the insulation resistance between the conductive part and the shell 1.5～10MΩ. The arrangement of the electric heater in the storage tank is shown in Figure 2 and Figure 3:
Figure 2: Plane layout of RDRQ electric heater on vertical oil tank
Figure 3: Horizontal installation of RDRQ electric heater on horizontal oil tank
1.2 The RDRQ electric heater is installed horizontally. A space equal to the length of the heater is reserved on the front side of the heater junction box to prepare for maintenance.
Weld the installation puppet on the oil tank first (whether there is a reinforcement ring on the tank wall is determined by the process design, the installation puppet is provided by the factory, and the specifications are shown in Table 1), and the electric heater is installed on the puppet The connecting flange is installed on the tank, and an oil-resistant asbestos rubber gasket should be added between the two flanges, and the bolt connection should be fastened without leakage (see Figure 4). The inlet of the junction box must be installed downwards. The highest position of the electric heater body must be controlled below the lowest working liquid level of the oil tank process design.
The electric heater is equipped with a special grounding bolt. The user should reliably connect the grounding wire to the bolt, and the grounding wire should be used
Multi-strand copper wires above 4mm2, grounding resistance ≤10Ω. After the electrical wiring is completed, the joints of the junction box must be coated with industrial petroleum jelly
Ensure that the seal is intact.
1. Electric heater 2. Factory matching installation short section ⒊oil tank wall
2. Supporting device installation:
2.1 Control cabinet installation and electrical wiring:
Non-explosion-proof electric heating control cabinet should be installed outside the explosion-proof area (safe area). The box body should be vertical when installing, and the grounding wire should be firm and reliable. The floor type requires anchor bolts to fix the box on the foundation.
According to the requirements of explosion-proof regulations, copper core cables are required for power cables and control cables, and their cross-sections should be selected according to the power of the electric heater (the actual cable cross-section should be re-checked by the design according to the voltage drop), and according to the manufacturer The provided wiring diagram is correctly wired.
2.2 Installation of temperature measuring resistance:
Because the oil in the tank presents a non-uniform temperature field, the relative position of the temperature measuring resistor and the electric heater should be selected to reflect the true temperature of the oil inside the tank. It is recommended to install it according to the position shown in Figure 5. .
Installation method: The temperature measuring resistor is installed in the steel sheathing tube, and the steel sheathing tube is welded to the wall of the oil tank. It is inclined downwards during installation and forms an angle of 15 degrees with the horizontal (see Figure 6). Add an appropriate amount to the casing After the transformer oil and the temperature measuring resistor are inserted into the steel sheathed tube, they are fastened with positioning screws.
2.3 Installation of the liquid level controller: the relative position of the liquid level controller and the electric heater (see figure 7), provided by the product manufacturer, flange pipe with an outer diameter of Φ90mm (see figure 8) Weld horizontally on the wall of the oil tank, and install the level controller on the flange pipe. Oil-resistant asbestos rubber gaskets should be used between the flanges.
Figure 5: Relative position of temperature measuring resistor and electric heater installation
Picture 6: The temperature measuring resistor is installed on the oil tank
Figure 7: Relative position of liquid level controller and electric heater
Picture 8: The installation of the level controller on the oil tank
Note: When determining the relative positions of the electric heater, float level controller, and temperature measuring resistor, it is recommended that the lowest position of the level controller is 150mm higher than the upper surface of the electric heater, and should be higher than the platinum heater. The lowest end of the resistor is 100mm.
2.4 Installation of heating chamber for commercial oil tanks: The characteristics of commercial oil tanks are: unplanned, irregular, and small in quantity. Therefore, the use of electric heat tracing for heat preservation of the entire commercial oil tank consumes energy and is uneconomical, and the management is also complicated. A heating chamber with a certain capacity is designed in the oil tank, and an electric heater is installed in it. When the customer sends a request for oil purchase, the electric heater is operated to heat the medium in the heating chamber. After the customer has completed the procedures for purchasing the oil, the oil can be sent.
Picture 9: Installation of RDRQ electric heater in the oil tank heating cabin
3. Trial run:
3.1 Check before trial operation:
Check whether the installation position of the electric heater and supporting components is correct, whether the connecting bolts are loose, whether the grounding is reliable, and whether the grounding resistance is qualified. Check whether the electrical wiring conforms to the drawing, whether the wiring process meets the installation requirements, and whether the bolt connection is firm. Use a 1000V shaker to check whether the live part and the shell are well insulated, the insulation resistance is ≥1.5MΩ, the insulation resistance of the marine electric heater is ≥10MΩ, and check whether the power supply voltage is consistent with the product nameplate. Check whether the over-temperature protection sensor is connected. The over-temperature protector has been set at the temperature according to the explosion-proof regulations at the factory, and no further adjustment is required. Check whether the oil level in the oil tank is higher than the top of the electric heater. ,
3.2 Trial run:
Set various process temperature limit values according to the temperature regulator manual. After the transfer switch is set to the manual position, the power is turned on and the trial operation is started. After running in the manual position for 10 minutes, the condition is normal, you can turn the switch to the automatic position, and the equipment is put into automatic operation. Operate correctly according to the operating instructions in the accompanying drawings and documents of the equipment, and record the relevant data such as voltage, current, and temperature during operation. After the trial run for 2 hours, there is no abnormal situation before it can be transferred to the formal operation.
