We can put up with the slow speed of the water transportation, but we would hate it if it’s leakage or blocked. Under this situation, how to pick up the right steel pipe would be a great art. For example, we must stop the pollution of our beaches, thus, it is our responsibility to choose the large diameter steel pipe for the fast transmit of the drainage water. Of course, more steel pipes would be work too. At the same time, a balanced technology of the steel pipe is very important for engineering project, thus, we need to advance our steel pipe’s manufacturing technology.