In the field of tankship transportation, ensuring the efficient, safe, and stable transportation of liquid cargo is of utmost importance. Twin – screw pumps, with their unique performance advantages, have become the ideal choice for transporting liquid cargo on tankships.
I. Outstanding Self – Priming Ability
A. Handling Complex Loading Situations
When tankships load liquid cargo at the dock, they often encounter complex situations such as differences in the relative height between the cargo storage location and the pump. The strong self – priming ability of twin – screw pumps plays a crucial role here. Without the need for additional vacuum – pumping equipment or complex priming operations, it can rely on its own structure to suck in and transport liquids located below the pump inlet. For example, when a tankship is docked and extracting oil from the dock storage tank, even if the storage tank is slightly lower than the pump inlet, the twin – screw pump can easily suck in the oil and smoothly transport it to the ship’s cargo hold, greatly improving the loading efficiency and avoiding time – wasting and additional equipment investment due to difficult self – priming.
B. Ensuring Smooth Transportation Throughout
During the transportation process, as the liquid cargo in the cargo hold is gradually consumed, the liquid level will continuously drop. The consistent self – priming ability of the twin – screw pump ensures that even when the liquid level in the cargo hold is low, it can still continuously and effectively transport the remaining liquid, guaranteeing the continuity of the transportation process and avoiding transportation interruptions caused by a decrease in the liquid level. This provides strong support for the safe and stable transportation of tankships.
II. Efficient and Stable Transportation Performance
A. Adaptability to Various Liquid Cargoes
Tankships transport a wide variety of cargoes, ranging from low – viscosity light petroleum products to high – viscosity chemicals. Twin – screw pumps have good adaptability to liquids of different viscosities. For low – viscosity liquids such as gasoline, twin – screw pumps can achieve rapid and stable transportation by virtue of their precise screw clearances and efficient positive – displacement transportation principle, avoiding problems such as liquid leakage or flow fluctuations. For high – viscosity chemicals, the special screw structure design of twin – screw pumps can provide sufficient axial thrust to ensure the smooth flow of high – viscosity liquids inside the pump, achieving efficient transportation.
B. Precise Flow Control
In tankship transportation, precise control of the liquid flow rate is crucial for ensuring accurate loading and unloading of cargo and meeting the needs of different transportation stages. Twin – screw pumps can precisely control the flow rate by adjusting the rotational speed of the screws. During cargo loading, operators can flexibly adjust the pump’s rotational speed according to the capacity of the cargo hold and the loading speed requirements to achieve accurate quantitative loading. During the unloading process, the unloading flow rate of the liquid can also be precisely controlled according to the capacity of the receiving storage tank and the receiving speed, avoiding safety hazards and inefficiencies caused by excessive or too – small flow rates.
III. Low Shear Force and Gentle Transportation
A. Protecting Cargo Quality
Many liquid cargoes transported by tankships, especially some chemicals and high – value – added petroleum products, are very sensitive to shear force. Twin – screw pumps exert minimal shear force on the liquid during transportation, effectively protecting the chemical and physical properties of the cargo. For example, when transporting certain special chemicals containing high – molecular polymers, the high shear force of traditional pumps may cause the polymer molecular chains to break, thus changing the properties of the cargo. The low – shear – force transportation method of twin – screw pumps can ensure that the quality of these cargoes remains unaffected during transportation, providing customers with high – quality transportation services.
B. Reducing Equipment Wear
Low shear force not only protects the cargo but also greatly reduces the wear of the pump’s internal components. Since the liquid is subjected to less shear action when flowing inside the pump, the erosion and friction on key components such as screws and bushings are significantly reduced, which extends the service life of the twin – screw pump. During the long – term transportation operations of tankships, reducing equipment wear means reducing maintenance costs and equipment replacement frequencies, improving the reliability and operational efficiency of the equipment.
IV. Smooth Operation and Low Noise
A. Ensuring the Safe Operation of the Ship
When a tankship is sailing at sea, it requires a stable and reliable cargo transportation system. The screws of the twin – screw pump are processed with high precision and have an accurate dynamic balance design. During operation, it is very stable, effectively reducing the impact on the ship’s structure and other equipment caused by pump vibration. Especially on some large – scale tankships, the cargo transportation system is huge. If the pump operates unstably and generates strong vibrations, it may lead to a series of safety hazards. The smooth – operation characteristics of the twin – screw pump provide a strong guarantee for the safe navigation of tankships.
B. Improving the Working Environment of Crew Members
The twin – screw pump generates extremely low noise during operation, which is of great significance to the crew members who work on the ship for a long time. A low – noise environment not only helps improve the crew’s work comfort and reduces the damage of noise to hearing but also enables crew members to be more focused when operating and monitoring the pump’s operation, reducing the risk of operational errors caused by noise interference and further enhancing the safety and reliability of tankship transportation.
V. Compact Structure and Easy Maintenance
A. Saving Ship Space
Space on tankships is limited, and it is necessary to rationally arrange various equipment to improve space utilization. Twin – screw pumps feature a compact structure, small volume, and light weight, and can install efficiently in the limited ship space. Compared with some large – sized traditional pumps, twin – screw pumps can install more flexibly in different positions of the ship, meeting the complex equipment layout requirements of tankships and freeing up more space for the arrangement of other equipment.
B. Reducing Maintenance Costs
The structure of twin – screw pumps is relatively simple, with a small number of parts, and is easy to disassemble and assemble. This allows workers to inspect, repair, and replace parts more conveniently during daily maintenance and fault repair. In addition, due to the long service life of twin – screw pumps and relatively long maintenance intervals, tankship operators can reduce maintenance costs during operation, improving the overall economic efficiency of the equipment.
In conclusion, twin – screw pumps have become the best choice for transporting liquid cargo on tankships due to their outstanding self – priming ability, efficient and stable transportation performance, low shear force and gentle transportation, smooth operation and low noise, as well as compact structure and easy maintenance. For tankship operators, choosing twin – screw pumps means higher transportation efficiency, lower operating costs, and more reliable transportation guarantees.
