Q:When purchasing ductile iron pipes, what technical indicators and acceptance criteria should be given special attention?

Ductile iron pipes are widely used in municipal engineering projects such as water supply, drainage, and gas transmission due to their excellent mechanical properties, corrosion resistance, and long service life.

Material Standards: First, when selecting ductile iron pipes, it is essential to check whether the material conforms to international or national standards. These standards clearly stipulate the composition, mechanical properties, and dimensional tolerances of ductile iron pipes.
This ensures that the pipes meet quality requirements, possess good mechanical properties and corrosion resistance, and provide greater peace of mind.

Appearance: High-quality ductile iron pipes should have a uniform surface coating without obvious defects or flaws. When purchasing, the pipe surface can be visually inspected for casting defects such as porosity, cracks, cold shuts, and sand holes.
These defects can affect the strength and service life of the pipe. Additionally, attention should be paid to the flatness of the pipe ends to ensure that there are no problems during pipe cutting and connection.

Corrosion Protection: In practical applications, ductile iron pipes often need to withstand various corrosive environments; therefore, internal and external corrosion protection treatment is particularly important.
External corrosion protection typically employs asphalt or epoxy resin coatings to ensure the pipeline's service life in buried or humid environments. Internal corrosion protection usually uses cement mortar lining, which offers good corrosion resistance and wear resistance.
When purchasing, carefully check whether the anti-corrosion coating is uniform and whether there are any bubbles or peeling. You can also make a preliminary judgment on the uniformity and adhesion of the cement mortar by tapping and listening to the sound.

Time：11/05/2026 16:07:22