Tanker

Oil tank truck: There are many different titles depending on the medium, configuration, and name of each place, such as tanker, tanker, tanker, fuel tanker, puller, etc. Mobile refueling vehicles, tax-controlled refuelling vehicles, computer refueling vehicles, diesel transporters, gasoline transporters, coal tar transporters, lubricant transporters, crude oil transporters, heavy oil transporters, and oil transporters.

According to their appearance, tankers can be divided into: flat-head tank trucks, sharp-head tank trucks, Qitou tanker trucks, single-bridge tanker trucks, rear-shuangqiao tanker trucks, Shuangqiao tanker trucks, and double rear axles. Tanker, Light Tanker, Small Tanker, Medium Tanker, Large Tanker, Semi-Trailer, Small Three-Axis Tanker, Front Double Rear Single Tanker, Front Four Rear Four Tanks Car, front four after eight oil tanker, etc.

According to the brand, the tanker can be divided into: Dongfeng Tanker, Liberation Tanker, Foton Tanker, Heavy Gas Tanker, Beiben Tanker, JAC Oil Tanker, Shan Gasoline Tanker [1], China Ling Oil Truck, Isuzu Oil Tanker, Qingling Oil Tanker, Jiangling Oil Tanker, etc.

Transport medium: Suitable for the transportation of gasoline, kerosene, diesel oil, vegetable oil, edible oil, heavy oil, coal tar and non-petroleum products. Alcohols, aldehydes, benzene, ether and other liquid substances.

罐 Tank material is made of high-quality 4-6mm thick carbon steel. GB plate can be made of carbon steel, stainless steel, aluminum alloy, pure aluminum can, rubber lined, rotomolded, plastic tank, fiberglass tank as required.

罐 Can-type round, oval, round;

æ²¹ Oil pump has self-priming pump, gear pump, double pump;

â—‡ It can be designed as a special chemical transport vehicle;

â—‡ It is possible to divide the positions independently and pack different oil products. Pump-in pump, self-flow, optional flow meter, computer tax-controlled fuel dispenser, 15-meter refueling reel (can be automatically returned), multiple anti-wave partitions are installed inside the tank to make the tank have high strength and center of gravity Stability, vehicle safety and stability and other features.

All tanker trucks can be designed into chemical vehicles and various types of heating and heat preservation tanks; all tanker trucks can be equipped with computer refueling machines; a wide range of customer tonnage can be selected to meet the needs of users; there are many tanks Road anti-wave partitions. The use of high-pressure gas leak detection, so that the tank has high strength, stable center of gravity, vehicle safety and stability

Mobile refueling vehicle

The tank structure is an elliptical cylindrical or trapezoidal surface cylindrical body, made of high-quality steel plate, the entire tank is divided into single or multiple positions, the chamber can be divided into chambers, the bottom of the intermediate baffle has through holes, and the intermediate positions of each warehouse are welded or Multiple warehouses, warehouses can be divided into rooms, through the middle of the bottom of the baffle through holes, each warehouse is welded with a warehouse to strengthen the wave partition, in order to reduce the impact of the tank body oil and improve the rigidity of the tank.

In order to prevent corrosion, the outer surface of the tank is coated with anti-rust paint and decorative paint. A tank indicator is installed in the middle of the tank. The tank can directly indicate the volume of the tank when it is refueled or discharged to the tank. (Optional)

The canisters are 500mm diameter holes for maintenance. The big cover is fastened to the can bottom by bolts. The small cover and the big cover are connected together by a support pin and a lug. Turn the handle on the small cover clockwise to compress the small cover. Reverse, after the ear plate is released, the small cover can be opened, and the breathing valve is installed on the upper side of the lid.

In order to ensure that the tanker is in operation, the pressure in the tank is basically the same as the atmospheric pressure. A breathing valve is installed on the tank and the oil level in the tank rises when the oil in the tank is heated to expand or when the oil is pumped into the tank. The pressure increases, when the tank pressure is higher than the external pressure 8KPA, the valve on the breathing valve opens; When the oil pump to the outside or the oil cold shrinks when the oil surface drops, the pressure decreases, when the tank pressure is lower than the outside pressure At 3 KPA, the valve below the breathing valve opens.

With the function of self-priming oil, self-discharging and other functions, it can be divided into two to three different specifications of oil, optional double pump.

The car purchaser must hold a certificate for the transport of dangerous goods, and the transporter must have a qualification certificate and an escort certificate.

Tank volume: 3-6 cubic meters (3-5 tons full load diesel)

Tanker: The national computer tax control fuel dispenser with a luminous LED display can calculate the amount and scheduled flow and other functions. Attachment carries 15 meters of automatic return reel, high pressure anti-corrosion refueling gun. Major brands include: Henan Zhengxing fuel dispensers, Shanghai Bole fuel dispensers, Beijing Sanjin fuel dispensers, Guangdong Hengshan fuel dispensers and other well-known domestic brands. Tank Introduction: The world's pressure volume sophisticated manufacturing equipment, one-time roll forming manufacturing process, mechanical horizontal welds, computer-controlled automatic forming head, full inside and outside welding butt, solid and durable.

Pipe network system: All aluminum alloy material, double net up and down, self-priming and self-discharge can be realized.

Others: gear oil pump, breathing valve, fire extinguisher, two 3 meters butt oil suction tube, safety warning sign and on-board maintenance tools, etc. [2]

1. To ensure the tank truck is clean, the tank and oil system should be cleaned periodically. The inner and outer joints at both ends of the oil hose should be coated with lubricating oil. The tank truck can be easily disassembled and installed. After each time the tubing is completed, clean it in time to ensure that it is clean inside!

2. The use and maintenance of the tanker oil pump is strictly performed according to its use and maintenance instructions!

3, before refueling operations, must use the plug to insert moisture into the wet land, the tanker grounding tape should be grounded, the operation process should always maintain good static conduction!

4. Tanker safety valves and filter nets should always be checked and cleaned!

5, tanks and piping systems should be cleaned regularly. The tanker regularly checks whether the joints of the pipeline system are well connected and the seal is reliable!

6: The tanker should be installed in accordance with the specification electrostatic belt, when the static electricity encountered in the car concentration of highly flammable gas, explosion occurred, the electrostatic belt for the car body and other friction is frequent, easy to generate static electricity space can effectively go out Electrostatic hazards to ensure that the body is not compromised.

installation method:

Installed in the chassis metal parts! After a period of wear, the rubber band on the top can be put down!

Conditional users can install electrostatic tanker grounding alarm

(5) It is forbidden to add fuel to the tanker under the high voltage wires.

(6) The method of hanging fire is not often used. Sometimes the spark plug of a car will have carbon deposition. When a certain cylinder's carbon deposition is serious, the cylinder will not work properly. In order to make the cylinder work normally, the method of “hanging fire” outside the cylinder is adopted (leaving the spark plug and the high voltage wire 3 Mm - 4 mm gap) to improve the energy of the spark plug electrode flashover, so that the cylinder back to work, but the general "hanging fire" method is not easy to fall off with little attention. If there is dripping gasoline on the cylinder, it is extremely easy to have a fire. Therefore it is only a temporary remedy. The correct treatment should be timely cleaning and maintenance of spark plugs, try to avoid the use of "hanging fire" method. Preparation of tanker before use

1. Insert the conductive rod into the ground to make it "grounded". If the ground is dry, it can be watered to make it wet, ensuring good grounding. Check the ground chain to make contact with the ground.

2. Open the tanker control box door and check the valve handles to make them closed (vertical position).

3. When using the oil pump for the first time, there is no oil in the pump and it is necessary to add oil in advance. 10 liters of oil can be added through the oil inlet.

4. Check the lubricant oil level in the gearbox to the lower edge of the grease plug hole. If insufficient, add gear oil.

5, check the gearbox lever, so that it is in a neutral position, check the position of the power lever control handle, so that it is horizontal to the right position, check the throttle controller to make it the smallest.

Maintenance of tanker

Some people think that the maintenance of oil tankers is changing oil. This is one-sided and wrong. Maintenance of tank trucks is a broad concept, including oil and filter replacement and cleaning of various engine systems (oil, gear oil, brake oil, auto-oil, booster oil, glass water, battery water, machine filter, steam Filter, air filter, air conditioning filter, etc.) Replacement and maintenance of consumable parts of the truck such as belts, batteries, brake pads, ball heads, clutch plates, shock absorbers, etc., tank car beauty (car wash, exterior paint care, Interior trim care, etc.)

Normal tanker maintenance can maintain vehicle performance and extend its useful life. The introduction of the maintenance of consumables of oil tankers this time is how to inspect, replace and maintain. At the same time, the phenomenon of wearable parts found in the maintenance and these phenomena indicate what the problem is.

â—† The driver's friends should pay attention when the tanker is driving:

1 The tanker checks the working condition of each instrument while driving;

2 Check if the steering system is working properly when the tanker is in motion;

3 It is abnormal for the tanker to check the hand and foot brake while driving.

4 The tanker checks whether the engine, the chassis and the tank body are abnormal noises and abnormal odors during running.

5 Use the parking time to do the following inspections of the tanker: Check whether the brake drums of the front and rear wheels are overheated, check the tightening of the tires and nuts, remove the inclusions in the tire tread, and check for oil leakage or water leakage. , leak, check the situation of the leaf spring, if the drive shaft bolts are loose, check the appearance of the tank body and the tank network system of the tanker.

The mobile refueling vehicle is equipped with a vehicle-mounted computer tax-controlled fuel dispenser on the tanker truck. The fuel pump can be pumped into the refueling machine. The refueling machine can achieve "refueling" or "input amount" metering, or install a flow meter. Oil tankers are flexible and can be refueled according to demand. Cities, suburbs, mines, terminals, airports, stations, country roads and other places without gas stations, cars, loaders, excavators, cranes, mining equipment The refueling of ships has greatly improved the convenience of the refueling of various types of automobiles and equipment, the flexibility is not comparable, and the extensive service to the general public has reduced the inconvenience of all types of vehicles or equipment to go to gas stations to refuel. A truly mobile gas station.

Tanker oil and gas recovery system uses: During the loading and unloading of tank trucks, fully-enclosed gas recovery is achieved to limit the release of oil and gas to the atmosphere. While the tanker is pumping oil through the helium line, the oil and gas in the gas station tank returns to the tanker through the return line. Tanker trucks bring oil and gas back to the oil depot for processing to achieve the goal of oil and gas recovery.

Subsea valve use:

The bottom valve series, also known as the emergency shut-off valve, is installed at the bottom of the tank and can replace the traditional top-mounted refueling for bottom loading and refueling, making the operation of the staff easier, saving time, and safety and environmental protection. A cutting groove is designed on the valve body. When an accident occurs in the tanker, the cutting groove is disconnected, and the bottom pipe and the tank body are cut off without affecting the sealing of the tank body, thereby effectively preventing the oil leakage in the tank and ensuring the oil. Pot security.

Breathing valve use:

When the breathing valve dumps 70o, the sealing ball in the valve is dumped to form an effective seal to prevent oil leakage. Oil hole use:

Installed on the manhole cover at the preparation of the mouth, you can install a dipstick or liquid level meter.

Safety valve use:

Specially designed for cans, chemical tanks and other cans, according to user needs to set different opening pressure to meet different needs. The main body is made of stainless steel as a whole, which is corrosion resistant and highly closed. It is suitable for various environments.

Anti-overflow sensor:

Uses: Anti-flooding electronic sensors are widely used in a variety of container tanks in the closed liquid filling, in order to prevent the overflow of the liquid spill warning and a safety device, it is installed in the top of the container tank cover, when the oil When the alarm limit is reached, the sensor will alarm automatically.

1. Tanker trucks should be equipped with special fire extinguishers and should be equipped with tow subway chains and electric poles. When driving, the tow subway chain should be in contact with the ground; when refueling or draining, it must be inserted into the damp ground.

2. The oil tank filling hole should be tightly sealed, the oil discharge valve and the oil discharge pipe should be free of leakage, the tank vent hole should be unimpeded, the oil pump oil inlet filter should be cleaned frequently, and the two ends of the joint cover should be installed immediately after the delivery oil hose is used up. No dirt can enter.

3. Gasifiers and exhaust pipes of internal combustion engines must not be tempered. The exhaust pipe should be installed in front of the vehicle.

4. Tanker workers must not wear nailed shoes. It is forbidden to smoke near the oil tank and fire is strictly prohibited.

5. When parking, you should stay away from the fire source. During the hot season, you should choose a cool place to park. During a thunderstorm, it must not be parked under trees or under high-voltage lines. When parking in the middle of driving, there should be special care.

6. During the inspection and repair process, if the operator needs to enter the oil tank, it is strictly prohibited to carry the fire, and must have reliable safety protection measures. The outside of the tank must have special personnel to monitor.

7. All electrical devices in the vehicle must be well insulated and no sparks are allowed. Vehicle work lighting should be a safety light of 36V or less.

8. When the tank sedimentation tank is frozen, it is forbidden to use fire to bake, and it may be used to melt hot water, steam, or thaw the car into the greenhouse.

9. When carrying out maintenance and inspections under the vehicle, the internal combustion engine should be turned off, the hand brake should be tightened, and the wheels should be secured.

10. When a vehicle needs repair after repair, it should be driven by a qualified person. The vehicle must not be loaded with people and carry loads. When a vehicle needs to be tested on the road, a test license issued by the traffic management department should be affixed.

11. When parking on a ramp, a reverse gear should be hung on a downhill parking, a gear should be hung on an uphill parking, and a triangle wooden wedge should be used to fasten the tire.

Liberation tanker

Liberated cars occupy the second largest chassis sales in China, and the liberation of cars in the Northeast has always been the first choice. It is a strong opponent of Dongfeng Motor.

Chassis model: CA1251P1K2L7T3EA80

Upper tonnage (T): 14.6 tons

Vehicle size (length, width, height mm): 10850×2500×3300

Tank size (length, width, height mm): 8100×2420×1600

The total mass (kg): 25000

Rated load mass (kg): 14675

Service quality (kg): 10195

Fuel Type: Diesel

Engine Model: CA6DF3-22E3F (220 hp)

Power / Displacement: 165/7120

Engine manufacturer: FAW Jiefang Automobile Co., Ltd. Wuxi Diesel Engine Factory

Engine Type: Country III

Wheelbase (mm): 1900+5150

Tire specification: 10.00-20

Air conditioning, optional according to need, can also be equipped with tanker

The first thing to understand is to master the main structure, performance, and tanker functions of tank trucks. These aspects are well understood in our purchase of cars and daily use. The chassis of the special vehicle must be taken to the Dongfeng Second Automobile Service Station or Liberation First Automobile Service Station as required for warranty or maintenance; the second tanker truck [3] is usually a dedicated vehicle chassis (Dongfeng or Liberated Class II vehicle chassis), oil tank body, The system consists of four parts: the pipe network system and the power take-off device. Every driver of the tanker driver must do a routine maintenance of the tanker. He must check, clean, and tighten the car before, during, and after the delivery. Solid additions, timely detection of problems or safety hazards in the tanker, timely detection of problems in time to deal with; inspect the tank body, pipe network, valves, etc. before the oil leakage or oil leakage, the cover is pressed Requirements cover, lubricating oil quantity, fuel oil quantity, cooling water, hand and foot brake, steering device, instrument, light, tire pressure, tire nut, etc. Problems that driver's friends should pay attention to while driving a tanker:

1 The tanker checks the working condition of each instrument while driving;

2 Check if the steering system is working properly when the tanker is in motion;

3 It is abnormal for the tanker to check the hand and foot brake while driving.

4 The tanker checks whether the engine, the chassis and the tank body are abnormal noises and abnormal odors during running.

5 Use the parking time to do the following inspections of the tanker: Check whether the brake drums of the front and rear wheels are overheated, check the tightening of the tires and nuts, remove the inclusions in the tire tread, and check for oil leakage or water leakage. , leakage, check the situation of the leaf spring, whether the shaft bolt is loose, check the appearance of the oil tank and the tank network system of the tanker;

(6) Tanker vehicles regularly go to the Dongfeng Second Automobile Service Station and Liberate FAW Service Station to do the chassis maintenance and maintenance work;

Checking the fire extinguishers on new cars regularly is the key to ensuring safety.

First: The longer the car, the more lazy the maintenance

When a new car is used, the frequency of maintenance is very high, and a little problem will run 4S shop. The car is available for a long time, and it pays less and less attention to vehicle maintenance. Mr. Ying is one of the extreme examples. In fact, the frequency of car maintenance should be proportional to the age of the car. The longer the car is used and the greater the mileage, the more frequent maintenance should be. For example, a new car will be maintained once every 10,000 kilometers, and a 10-year old car should be maintained once every 1,000 kilometers. Nowadays, old cars that have been stipulated for more than six years are subject to annual inspections. This is the reason.

Second: The steering wheel is hit in the end

In the course of learning the car, the coach sometimes allows the trainee to “touch the steering wheel”, which is to make the car go more accurately. However, after schooling, many owners still retain this habit, and even intensify and fiercely beat the direction, this habit is very hurt, because doing so will make the steering system of the ball head, connecting rod wear is greatly increased. In addition, for the assisted steering vehicle, when the steering wheel is killed, the output of the booster pump to the steering gear is maximized, which causes the internal hydraulic pressure and the oil temperature of the booster system to increase rapidly, which may easily lead to damage or leakage of the assist system. For details, please refer to Tanker Steering Troubleshooting and Troubleshooting (1)

Third: brakes in the end

Bombing the throttle, slamming on the brakes is what many people like to drive. The car mainly uses disc brakes and drum brakes. Disc brakes use brake pads and brake discs to produce brake energy, and brake pads are lost parts. Pushing the brakes often will greatly shorten the life of the brake pads. Some cars can replace brake pads for 40,000 kilometers, and some cars will have to be replaced when they are 10,000 kilometers away. However, if the brake drum is often slammed on the brake, it can easily cause the brake to overheat and fail, which will affect the safety. Therefore, slamming on the brakes is the last resort to be done. Usually, driving should be based on “point brakes”.

Fourth: "Road to meet uneven" fuel door

Many people drive quickly and swiftly, and they do not slow down when they go over the deceleration belt or the gully. Encountered the pit road section, but also increase the throttle speed. These habits can easily affect the wheel alignment system, leading to vehicle deviation, or affecting the tire's life, and affecting the vehicle's suspension. Sometimes the trench can scratch the vehicle's chassis and even hit the engine.

Fifth: Randomly get on and off the road

This is the "killer" of car tires. Hantai Tire has done statistics. In China, 70% of tire damage is caused by cars getting on and off the road. In particular, squeezing on the side of the road can easily cause the tire to break. In addition, when the units and the district could not find a parking space, many car owners would use the flower beds and roadsides to park the car diagonally for a whole day. As everyone knows, this type of parking will make the tire steam pressure unbalanced for a long time, and it is very easy to cause tire bulging.

Sixth: Gasoline Alarm Continues to Drive

If the fuel tank warning light is on, it means that there are few left in the tank. But the old driver knows that, with the remaining fuel, the average vehicle can still travel tens of kilometers. Many models of petrol pumps are installed directly on the bottom of the fuel tank. Petrol pumps rely on gasoline for lubrication and cooling. If the amount of gasoline is missing too much, the gasoline pump cannot be properly lubricated and cooled under driving conditions, which can easily cause damage to the pump body.

First, engine deceleration and automatic flameout

When the engine is running, the accelerator pedal is released or the engine automatically shuts off when the vehicle is running. The fundamental reason is that the engine is not easily stabilized when the engine is not idling to idle, so the engine is immediately turned off. The specific reasons include the failure of the accelerator pedal; the crankshaft position sensor and the camshaft sensor signal are not synchronized; the fuel oil pressure is faulty; the control unit signal is incorrect; the injection timing is incorrect. Should focus on checking the value change from non-idle to idle.

Second, the lack of engine power or poor acceleration

The phenomenon of engine power shortage is basically normal when the engine is running without load, but the acceleration is slow when the load is running, and there is no power on the uphill. When the accelerator pedal is stepped on, it still feels that the power is not enough, and the speed is not changed and the maximum speed cannot be achieved. The phenomenon of poor engine acceleration is that the engine speed cannot be increased immediately after the accelerator pedal is depressed, there is a hysteresis phenomenon, or there is a slight fluctuation in the engine during acceleration.

Insufficiency of engine power and poor acceleration are caused by too high or too low oil pressure in the fuel system; poor injector fuel injection; sensor signal error; insufficient fuel injection quantity; Exhaust pipes are blocked.

Third, the engine can not start and start due to difficulties

There are many factors that cause the failure of electronically controlled diesel engines. Generally, they cannot be started (no initial combustion) and start-up is difficult. Its inspection and exclusion methods are as follows:

1. Check for fault codes. If any, check the contents of the fault code.

2. Check that the engine can turn when starting.

1 When starting, the starter does not turn and should be checked according to the cause of the starting system failure. First check the storage condition of the battery and the pole connection and contact; if it is normal, check the starting circuit, fuse and ignition switch. If the starter rotates and the engine does not rotate at start-up, the starter and the engine are partially engaged.

2 When starting, the engine speed is normal, and the engine does not start. Check the fuel injection system and the intake system separately.

For an electronically controlled fuel injection engine, there is no need to step on the accelerator pedal when starting. If the accelerator pedal is fully depressed or the accelerator pedal is pressed repeatedly to increase the fuel supply when starting, the engine speed may increase instantaneously, resulting in an increase in fuel consumption of the engine.

3. Disconnect the throttle pedal harness. In this case, the engine can enter the idling operation, which means that the fault is the failure of the accelerator pedal.

4. Appearance check: Check the air intake pipe for leaks.

5. Check the oil circuit: Check the connection status of the tubing, the phenomenon of air intake and the quality of the fuel.

6. Harness Check: Whether there is looseness in the harness connection status or the phenomenon of loose connection.

7. Inspection of the sensor: Check for sensor failure, loose or broken lines, and synchronization of the crankshaft and camshaft.

8. Check the injector for a control signal. If there is no control signal, check fuses, wiring, and ECU. If there is a control signal, check the injector spray condition is normal.

Tank trucks play a very important role in the process of oil and gas storage and transportation. In the storage and transportation of oil and gas, most tankers are used for oil storage and transportation. When oil is needed, the oil is output from the tank. In the process of exporting oil products, such a problem is inevitably encountered. Due to the low temperature, the oil product becomes viscous and the fluidity of the oil product is reduced. As a result, the oil product cannot be smoothly exported from the oil tank. Question, how to solve it? According to the "Tank Heating Technology Promotion Center" introduction, the new local rapid heating technology for oil tanks has solved this problem.

Tank local fast heater

working principle:

1, the "vortex hot film heat exchanger" along the radial extension of the tank into the bottom of the tank, hot medium (steam) take the tube, the oil flow from the shell within the tube, the shell oil inlet directly connected to the tank Internal media.

2. A temperature control valve is set at the steam inlet of the heat exchanger, and the temperature of the oil outlet is detected by the temperature probe to control the steam inlet steam inlet of the heat exchanger so as to ensure the temperature of the oil product is constant.

The heat exchanger adopts the high-efficiency heat exchange element—the eddy current hot film tube, to maintain the reasonable flow of oil products between the tubes. The thermal efficiency is 3-5 times that of ordinary heat exchangers. The heat transfer enhancement mechanism is: the oil fluid flows on the internal and external surfaces. When it is designed as a turbulent flow, it will produce strong vibration and scouring action. The direction of flow will change continuously. The high-temperature oil fluid that keeps close to the surface of the pipe will be continuously replaced, the insulation layer will be thinned and even destroyed, and the heat transfer on the metal surface will be accelerated. The microscopic vortex strengthens the internal heat diffusion of the oil fluid. The local high-temperature overheating of the fluid close to the surface of the pipe wall is not caused, so that the oil product can be properly and sufficiently heated without the possibility of coking and decomposing. Both heat transfer is good, but it will not be very resistant.

Heating features:

1, fast heating, high heat transfer efficiency, easy to scale.

2, can quantitatively heat the oil, how much heating is needed.

3, the oil will not appear local high temperature, carbonization, to ensure the oil quality and heater heat transfer efficiency.

4. The oil outlet temperature in the oil tank is the highest, which ensures the oil flowability.

5. It avoids repeatedly heating the oil in the tank, ensuring the chroma of the oil and reducing the cost of the oil treatment.

6, long service life, corrosion resistance, high temperature, high pressure, anti-fouling function, greatly improving the overall performance of the heat exchanger.

7. The advanced design of the process structure guarantees a smooth outflow of oil products and a better “bottomed” effect.

8, can achieve automatic control, according to the oil inlet and outlet temperature and inverted oil flow control steam feed.

9, compact structure, easy installation and maintenance, will not affect the safety of the tank due to the installation of the heater. Compared with the U-tube heat exchanger, in the case of the same heat exchange area: the size of the eddy current heat film heat exchanger is only about half of the U-tube heat exchanger's external dimensions.

10. Compared with the electric heating method, it is safer, the heating is gentler, and the effect on the oil quality is smaller.