How to repair a shell and tube cooler?

- Jun 29, 2018-

Correct maintenance of damaged cooling tube of shell and tube cooler


Cooler faults are mostly caused by cooling pipes. Due to corrosion, cavitation, and wear, the walls of the tube are thinned and perforated, and due to thermal expansion and contraction, vibrations caused by the movement of fluids cause joints and other mechanical damage. After the cooling pipe breaks, the two media will seep into each other and should be repaired in time. The methods are:


(1) Find out the damaged cooling pipe and use a pipe plug to block both ends. The taper of the pipe plug is between 3 and 5 degrees. The hardness of the pipe plugging material should be less than or equal to the pipe hardness. The total number of blocked pipes must not exceed 10% of the total number.


(2) Remove the damaged tube and replace it with a new one.


(3) Leakage at the connection between the pipe end and the tube plate should be re-expanded. If corrosion is serious, replace the tube bundle.


While dealing with the problem of cooling pipes, everyone must also master the correct disassembly so as to avoid damage to the equipment caused by the big unloading and unloading. Cooler removal and reassembly follow these steps:


(1) Close the inlet and outlet oil and water valves, release the retained media, and then remove the cooler from the system.


(2) Dismantle the water return cover and the water separation cover and inspect the seal ring, cooling pipe damage and scale deposition. If only plugging or replacing the cooling pipe can be performed immediately. If you need to pull out the cooling tube bundle must be removed from the direction of the fixed tube plate (large cooler can be vertical (fixed tube plate down), Then use a lifting device to lift the shell to expose the tube bundle.


(3) When assembling, proceed according to the reverse process of disassembly. The seal ring should generally be replaced with a new one.


(4) After the installation, the airtightness test on the side of the front oil side should be conducted separately. The test pressure should be greater than 1.2 times the actual working pressure.

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