Galvanized pipe will last for 40 to 50 years under normal conditions. However, if the pipes are well installed and maintained regularly, they can be used for a longer time. In contrast, the service life will be shortened. For example, it can last only 10-20 years in heavy industrial areas or coastal environment. Besides, it also depends largely on the thickness of zinc coating. In order to prolong the service life of your galvanized steel tubes, the first step you need to do is to choose suitable tubing from quality manufacturers, such as Wanzhi Steel. Below is more information for your reference.