Bengbu Aipu Compressor Manufacturing Co.,Ltd
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Introduction of Capacity Adjustment and Lubrication of Boil-off Gas Compressor

Introduction of Capacity Adjustment and Lubrication of Boil-off Gas Compressor

1. What to do if the air volume at the inlet of the boil off gas compressor is lacking?


The capacity of the boil off gas compressor is determined according to the maximum BOG produced in the storage tank. After the boil off gas compressor is selected, its capacity is constant. If the amount of air sucked is greater than the amount of BOG produced in the tank, the tank pressure will drop. When the tank pressure drops to a certain level, in order to compensate for the lack of air at the inlet of the boil off gas compressor, the following two measures can be taken:


(1) The gas phase at the secondary outlet of the boil off gas compressor is returned to the inlet flash tank D~2, and the control loop part of the valve PV-2 is controlled by the D-2 pressure P-2. Here, the set value of P-2 is 300KPa. If the pressure of D-2 is higher than this value, the valve PV-2 is closed. If the pressure of D-2 is lower than this value, the valve PV-2 is opened to make the gas phase return.


(2) The intake air volume can be reduced by unloading the boil off compressor inlet, that is, the capacity of the boil off gas compressor is reduced from 100% to 50%. For the Diaphragm-type unloading device, the unloading device of the inlet air valve controlled by the instrument air restricts the free movement of the valve plate and keeps the inlet air valve in an open state. Since the inhaled gas is not compressed and discharged, it returns to the inlet again. In this way, if one end of the double-acting cylinder (cylinder end or crankshaft end, generally the cylinder end) is unloaded, the capacity of the boil off gas compressor becomes 50%, and if both ends are unloaded, it becomes 0%.


2. Lubricating oil for the boil off gas compressor


Lubricating oil can be referred to as the blood of boil off gas compressors. It can lubricate various parts, reduce wear, and lower the temperature of parts. It can also play a role in sealing, damping, and preventing rust.


The boil off gas compressor produced by gas compressor manufacturers is equipped with a special lubricating oil pump. The oil pump must be started before turning on the boil off gas compressor. To ensure the normal operation of boil off gas compressors, there are strict requirements on the pressure and temperature of the lubricating oil. The high oil temperature is set to 55℃, and the low oil pressure is set to 0.175MPa. If the corresponding indicators are exceeded, the system will pre-alarm.


Our technology and innovation have never stopped. With the excellent quality of LNG BOG compressor and perfect and timely after-sales service, we are currently the boil off gas compressor supplier of well-known LNG operating companies and LNG engineering design and construction units, such as ENN, China Res Gas, China Gas, HKCG, etc. 

Our customers are well-known for advanced technology, excellent performance, safety and reliability, and long service life. Our company continues to improve product quality, wholeheartedly provide high-quality services to new and old users at home and abroad, and work together for common development. If necessary, please consult.

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