Which type of pipe has the highest normal maximum working pressure?

Ductile iron pipes are known for their robust characteristics and high strength, which contribute to their ability to handle higher internal pressures compared to other materials. The construction of ductile iron involves adding a small amount of magnesium to cast iron, which results in a material that is more flexible and resistant to cracking. This flexibility allows ductile iron pipes to withstand significant pressure and resist impact, making them suitable for applications in water distribution systems where higher pressures are common.

The high normal maximum working pressure capability of ductile iron makes it a preferred choice for many water and wastewater applications, particularly in areas where harsh conditions or high flow rates are expected. As a result, ductile iron pipes can typically support higher working pressures than reinforced concrete, polyvinyl chloride (PVC), or high-density polyethylene (HDPE) pipes, which have lower pressure ratings due to their material properties or construction methods.

Understanding the strength and pressure capabilities of various piping materials is essential for engineers and operators to ensure the integrity and reliability of water distribution systems.