How To Check The Leakage Of Plate Fin Heat Exchanger
The leakage of the aluminum plate fin heat exchanger is mainly leakage and leakage. No matter the method of leak detection, the purpose is to solve the leakage problem inside and outside.
Soap bubble
After the aluminum plate-fin heat exchanger strength test, the general channel filling the pressure value of the media to 0.1 MPa to 0.1 MPa dry, clean, no oil, gas, on the surface of the heat exchanger, brush at a certain concentration of soap and water, if there is a leak, will be blow fly continuous formation of soap bubbles or soap bubbles. Find out the leakage point, and discharge the pressure of all media channels, then repair the repair.
Air tightness test leak detection method
On aluminum plate-fin heat exchanger after the strength test, to all the media channels into a dry, clean, oil-free air or nitrogen, to channel pressure required by the design pattern of air tightness test pressure plate to be included in the pool of voltage 30 minutes, to judge surface had bubbles appear, if there are any bubbles, find out funnelled to tag.
Then, according to the principle of low voltage channels after high pressure first, successive emptying measured channel, according to the corresponding methods of leak detection technology by channel check, determine whether there is funnelled, and defects of leakage between which group of channels.
U-tube method
After finishing the strength test and air tightness test of the workpiece, the whole performance of the aluminum plate fin heat exchanger was checked by u-tube method.
Will be checked by channel of each nozzle using stuffy plug seal, only leave a nozzle with a rubber hose is connected to the transparent glass U tube containing a certain amount of water, at this time were the pressure inside the channel atmospheric pressure with the outside world was flat, u-tube two liquid surface flat, no height difference. Other media channels into a dry, clean, oil-free air or nitrogen, to channel pressure required by the design pattern of air tightness test pressure, after a certain time, observe the u-tube horizontal plane within two straight pipe change, if connected to the surface on one side of the channel is lower than the general atmospheric