The horizontal pump is horizontally arranged (the liquid inlet pipe is lower than the liquid discharge pipe), and heating gas (set behind the pump or in front of the filter in front of the pump to prevent impurities from entering), seal gas, liquid discharge exhaust valve (discharge at low place and exhaust at high place) and return pipeline (return liquid inlet phase) are required.

The air cooling tower of precooling system has two forms: closed circulation (the air cooling tower is divided into upper and lower sections, and the chilled water circulates between the upper section of the air cooling tower and the water cooling tower) and open circulation (into the circulating water system). The closed circulation is mainly used in chemical plants with poor water quality, which needs to supplement fresh water and chemicals