Loading and Unloading LPG

Liquefied gas pumps are special equipment used to transport liquefied gas (LPG). They are usually designed for high-pressure environments to ensure that the liquefied gas remains in a liquid state at normal temperature and pressure. LPG pump is a device that uses centrifugal force to transport gas to a specified location. Liquefied gas pumps usually work by centrifugal pumps or gear pumps. These pumps are positive displacement vane pumps, which work by centrifugal sliding of the vanes, and the flow rate is related to the speed of the shaft. The air pump works by compressed air or gas. This product is mainly used in gas stations, industrial production and other fields. Liquefied gas pumps are used to transport LPG. At a liquefied gas compression station, liquefied gas is loaded into a high-pressure container, then pressurized by a compressor and sent to a cooler for cooling. In the cooler, the liquefied gas is cooled below its boiling point and becomes liquid. Then, the liquefied gas is transported to a storage tank or pipeline by an LPG pump for transportation or storage. Usually, liquefied gas turbine pumps, liquefied gas vane pumps, and liquefied gas multi-stage centrifugal pumps are used. They are efficient, reliable, and safe, and can operate stably for a long time in harsh environments.

Core features

1. Liquefied gas pumps are usually designed with a high-efficiency transmission system, which can quickly and stably transmit liquefied gas and reduce energy consumption.

2. Provide precise flow control, suitable for precision delivery and filling tasks. Adapt to the requirements of different pressure levels, especially in LPG  storage and transportation and gas stations, liquefied gas pumps need to withstand higher pressures.

3. Liquefied gas pumps use corrosion-resistant and high-temperature resistant materials, such as stainless steel and alloy materials, to ensure that the pump body will not be corroded or worn by liquefied gas for a long time.

4. With explosion-proof design, it meets strict safety standards and is suitable for high-risk environments. Provide variable frequency drive (VFD) to achieve flow regulation, and flexibly adjust the delivery speed and pressure according to application needs. 5. Common drive methods include motor drive, diesel engine drive and pneumatic drive, and provide customized solutions according to the needs of different scenarios.

6. Low noise design reduces noise pollution at industrial sites, especially suitable for gas stations near urban areas and residential areas.

7. High-efficiency, stable and high-performance design, accurate flow, adapting to various liquefied gas transportation needs, durable and reliable high-quality materials and strict anti-corrosion and explosion-proof design to ensure the long-term operation of the pump in harsh environments.

8. High safety, multiple safety protection designs, such as over pressure protection, temperature monitoring, automatic shutdown function, etc.

9. Diversified selection provides a variety of drive modes and pump types to meet different flow, pressure and application requirements

The core of the precautions for the use of liquefied gas pumps is to ensure the operation specifications, prevent equipment damage and ensure safety, including key links such as pre-startup inspection, operation monitoring, prohibition of idling, pressure management and maintenance.

Main precautions

‌Pre-startup inspection and preparation‌

‌Manually rotate the pulley‌: Before the equipment is out of use for a long time or used for the first time, it is necessary to manually rotate the pulley for more than 2 turns to confirm that there is no abnormal sound or abnormal phenomenon.

‌Empty the gas in the pump‌: Before starting, the gas must be released through the highest point of the outlet pipe to ensure that the pump is full of liquid to avoid idling.

‌Check pressure and connection‌: Confirm that the cylinder angle valve is open and the inlet and outlet pressures are normal (about 2 kg). If the cylinder has a liquid phase port, the liquid phase port should be connected first.

‌Operation specification‌

1.‌Prohibit idling and reversing‌: Idling will cause serious wear in the pump, and reversing may damage the motor. If there is no liquid flow at the outlet, it is necessary to stop and check immediately.

2.‌Grounding and power supply matching‌: The equipment wires must be grounded, and the ordinary household power supply must ensure that the voltage and current meet the motor power requirements to avoid burning the motor.

3.‌Monitoring operation status‌: Observe the pressure gauge (≤0.49MPa in winter, ≤0.686MPa in summer), shaft end temperature (≤40℃) and abnormal noise during operation. If abnormal, stop the machine for inspection immediately.

4.Under certain conditions, the liquefied petroleum gas delivered by the liquefied gas pump will vaporize into a flammable gas about 250 times its original volume, and it is easy to spread. It will burn or explode when encountering an open flame, so special care must be taken when using it.

‌Safety and maintenance management‌

1.‌Anti-icing and blockage‌: Water-containing cylinders are prohibited in winter to prevent water from freezing and blocking the pipeline; clean the filter before the pump regularly (recommended once every 3 months).

2.‌Correct start-stop steps‌: The start sequence is open valve → exhaust air → start pump → adjust pressure; shutdown requires first turning off the motor → closing valve → cutting off the liquid supply → closing the safety reflux valve.

3.‌Regular maintenance‌: Bearing grease is replenished every 120 hours, pressure gauge is calibrated every 6 months, and failed instruments are replaced in time.

Future development trend of LPG pumps

As an important equipment in the field of LPG transportation, there is still a lot of room for development in future applications. In the future, LPG pumps will develop in the direction of low energy consumption, high efficiency, and diversified environmental protection. At the same time, influenced by science and technology, LPG pumps are gradually realizing intelligent and automated control, which will better meet the needs of different fields such as petrochemical industry, urban gas, and civil gas.