Shell & Tube

Heat Exchanger

The shell and tube-type heat exchanger(hydraulic oil cooler) is divided into horizontal installation and vertical installation. 

The heat transfer core is divided into a light tube type, a finned tube type, and a heat dissipation plate type. The PS series coolers were developed, researched, and designed independently by our company with the whole radiator piercing through a copper pipe mode.

Heat transfer performance is more than 60% higher than the original finned tube series coolers. After being put on the market, it has been highly praised by many industry leaders. The tubular heat exchangers have the unique advantages of having a small size, large heat transfer power, etc., and are the most popular choice for hydraulic machinery, construction machinery, chemical machinery, electric machinery, compressors, and so on. 

Fits these applications: Hydraulic, Wind Power, Hydropower, Petrochemical, Ocean Going Ships, Metallurgical, Construction

How to choose a tubular heat exchanger?

Basic requirements:

  • Have enough heat dissipation area

  • High heat dissipation efficiency

  • The pressure loss is small when the oil passes

  • Compact structure, sturdiness, small size and lightweight

Selection basis:

  • The technical requirements of the system: the temperature, flow, pressure of the working fluid of the system when it enters the cooler and the heat that needs to be taken away by the cooler;

  • System environment: ambient temperature, cooling water temperature, and water quality;

  • Installation conditions: the location of the cooler and the space it can occupy;

  • Economy: purchase cost, operating cost and maintenance cost, etc.;

  • Reliability and life requirements: The life of the cooler depends on the water corrosion and tube bundles and other materials.

shell and tube heatexchanger.jpg
shell and tube heat exchanger

How to clean the tubular heat exchanger?

When the copper tube in the tube heat exchanger is damaged and leaks, if the tube plug is used to block it, the total number of blockages shall not exceed 10% of the total number of tubes (please refer to the requirements of the heat exchanger product manual). We can inspect and clean the surface of the tube wall of the tubular heat exchanger according to the water quality and soil quality. The cleaning method of tubular heat exchanger is as follows:

1. Cleaning the water side of the tubular heat exchanger

  • We can use trichloroethylene solution for flushing so that the cleaning liquid circulates in the cooler, the pressure of the solution is not greater than 0.63MPa, and the flow direction of the solution is best to be the opposite to the direction of the oil flow in the cooler. The cleaning time depends on the dirt. After rinsing, introduce clean water into the cleaning until the water flowing out is clean by visual inspection.

  • We can use carbon tetrachloride soaking, pour the solution into the cooler, and watch the color of the solution after 15-20 minutes. If it is severely turbid, replace it with a new solution and repeat the soaking until the color of the solution after soaking is similar to that when it is clean. Then introduce clean water into the cleaning, until the outflow of water is clean by visual inspection.

  • If there is no obvious structure in the waterside pipeline, you can clean it with the corresponding brush according to the diameter of the pipeline, and then rinse it with clean water.

2. After cleaning the tubular heat exchanger, perform a hydraulic test:
The cavities between the tubes of the tube cooler shall be tested for tightness with water at its nominal pressure or 1.25 times the working pressure, and the pressure shall be maintained for 30 minutes, and there shall be no leakage at the expanded tube or welded joint. The water must be completely drained after the test.

3. Heat exchange effect inspection of tubular heat exchanger:
After the lubricating oil is cooled by the cooler, the general temperature can be reduced by 5-10℃, and the temperature of the cooling water can be increased by 3-5℃.

4. The state of each connection port of the tubular heat exchanger:

it must not be opened for no reason during the cleaning process, and it must be sealed with a bulkhead or flange cover.