Semitrailer tank truck is a tank truck connected with the tow part by traction head. Compared with ordinary single type tank truck, semitrailer tank truck can effectively improve the transportation efficiency. In the case of the same tonnage, reduce transportation cost and save fuel consumption. It is mainly composed of tank, frame, traction device, supporting device, electrical system, walking system, protective device, accessories and so on.

Semitrailer tank truck is divided into two parts, the tank part and support tank body skeleton or driving part, semitrailer tank truck rear is roughly the same, there are two bridges (two shafts), rear three bridges (three shafts) points, according to the need to choose traction head. Semitrailer tank trucks are usually called by the brand of the tractor head.

Semitrailer tank body

1. The tank is made of 4mm or 6mm high quality carbon steel produced by iron and steel company according to the national standard. The shape is divided into oval or square shape tank, which can be loaded with 1-4 kinds of oil products. Also can produce heat preservation series tank.

2. Alcohol and chemical tank cars are made of stainless steel imported from South Korea, with a thickness of 4mm-5mm.

3. All kinds of hydrochloric acid, sulfuric acid, lye tank trailers are made of plastic, the thickness is 12mm - 22mm.

4. The tank body is equipped with multiple anti-wave partitions. The use of high pressure gas leakage detection, so that the tank has high strength, stable center of gravity, safe and stable vehicle transport characteristics.

5. According to the use of tank trailer can choose centrifugal pump, gear pump, stainless steel pump, with large flow, suction speed and other characteristics.

6. Tank metering can choose single count, double count flow meter, also can assemble tax control computer refueling machine, install 10-15 meters automatic retractable coil, with refueling gun. Edible oil can choose edible oil computer meter to measure.

Semitrailer tank truck features

• Use medium: gas and diesel.
• Tank material: carbon steel, aluminum alloy.
• Tank shape: oval and round.
• Unloading system: Bottom loading system, oil recovery system, overflow control system.
• Features: Light weight, large load weight, high transportation efficiency and operating income, good electrical conductivity, high safety, no rust, no pollution to the shipping medium.

Special configuration of semitrailer tank truck ​

Bottom loading system (tank)

Comparison of principle between conventional top loading and bottom loading and unloading systems

• Top loading: It is unsafe to operate on the top of the tank, and oil and gas escape into the atmosphere, which is a safety hazard.
• Bottom loading: Safe and efficient internal oil and gas circulation with no explosion risk.

Bottom loads the components of the system

• Bottom handling system: Pneumatic controlled bottom valve and API connector valve.
• Oil and gas recovery system: Oil and gas recovery connector, oil and gas recovery valve, side plate vent valve.
• Overflow prevention system: Sensor and socket control system.

Truck-mounted pump loading and unloading system (tank)

Purpose: pump the liquid in the tank into the tank which is higher than the tank truck, and inhale the liquid in the tank which is lower than the tank trailer

Driving type of pump:

• Tweeter drive (for cycling).
• 380V motor drive (for semitroring or cycling).

Pump line function:

• Pump in and out through the steel pipe and different ball valve opening and closing.
• Connect the tank outlet to the inlet and outlet of the pump through the hose to realize the pumping in and out function.

Valve and emergency bottom valve

Breathing valve. Why do we have a breathing valve? What does it do?

In order to ensure that the tank in the working process, the tank pressure and atmospheric pressure is basically consistent, in the tank cover is installed on the breathing valve, when the tank oil heated expansion or when the oil pump to the tank refueling, the tank oil surface rises, the pressure increases, when the tank pressure is 8KPA higher than the external pressure, the valve plate on the breathing valve open. When the oil pump is discharged outward or the oil is contracted by cold, the oil surface drops and the pressure is reduced. When the pressure in the tank is 3KPA lower than the external pressure, the valve plate under the breathing valve is opened.

For tank trucks loaded with toxic and corrosive media, the valve pressure rating shall not be lower than PN 1.6mpa. The discharge valve shall be a series of double valves, one of which is a built-in valve, and installed at the bottom of the tank.

In the new standard, the tank truck also put forward the configuration of the bottom valve requirements, to avoid increasing the severity of accidents due to leakage. Emergency bottom valve: it is installed at the inlet of the pipe at the bottom of the tank. When the unloading pipe encounters accidental damage, the emergency bottom valve is still in the closed state and the medium will not leak. Emergency bottom valve has pneumatic and manual two kinds, easy to operate.

Safety accessory in tank top

• Tank top shoulder guards: There are shoulder guards on both sides of the tank top. The shoulder guards are higher than all the accessories on the tank top and can carry twice the total weight of the tank truck. In case of an accident such as a rolover, ensure that the accessories on the tank top will not be damaged and avoid liquid leakage due to the damage of the accessories on the tank top.