The ductile iron pipe fitting puddle flange pipe design requires that the buried depth of the pipe should be determined according to factors such as the degree of freezing, the intersection of external loads and other pipes. Under normal circumstances, the buried depth can be 0.2 meters below the freezing line, and meet the following conditions: When the pipe diameter is greater than 100mm, the minimum buried depth of the pipe top is 1.20 meters.
