The Benefits of Ductile Iron Pipe - Hebei Deko Commercial Co., Ltd.

05 Jun.,2025

 

The Benefits of Ductile Iron Pipe - Hebei Deko Commercial Co., Ltd.

A century ago, dedicated American engineers installed iron pipes to create the country's water supply system. This sturdy, safe and reliable product has withstood the test of time. Modern ductile iron pipes have a service life of more than 100 years. Due to their recyclable components, energy saving during service, durability, their own recyclability and the promise of the ductile iron pipe industry, it is a more environmentally friendly product. Ductile iron pipe is a key component of a clean energy future and modern, resilient water infrastructure. Ductile iron pipe has proven itself to stand the test of time.

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Ductile Iron Pipes

Benefits of ductile iron pipes include:

• Environmentally Superior Pipe

Ductile iron pipes are natural,safe, and sustainable. Ductile ironpipes contain at least 90% recycledmaterials with the pipes themselvesbeing 100% recyclable.

• Better Value

Ductile iron pipe is a better value than plastic pipe because it lasts longer and saves money over time. According to a University of Michigan report, Ductile iron pipe is the more cost-effective material over a pipeline’s service life with lower operational and maintenance costs and lower energy costs. By increasing the flow capacity and reducing costs, significant energy savings are achieved during the life of the pipeline. Ductile iron saves money.

• Lower Emissions and Less Energy

Ductile iron pipe has better environmental performance due to its lower greenhouse gas emissions in both the production and operation phases. From cradle-to-grave, ductile iron pipe is superior environmentally, as it requires less energy to pump water and has a lower environmental impact.

• Resilient

Ductile iron pipe is resilient through extreme weather events, natural disasters, soil contamination, and unpredictable situations. With its strength and durability, Ductile iron is the pipe of choice to protect against wildfires, earthquakes, floods, hurricanes, extreme temperatures, and the regular, ongoing stresses facing water utility systems. It is strong enough to withstand the harshest conditions, from high pressure applications, heavy soil and traffic loads, to unstable soil conditions. It can resist corrosion in most soils, and usually only needs an effective and economical polyethylene encasement. This is a loose sheathing in harsh environments. The metallic nature of ductile iron pipe means that it can be easily positioned underground by conventional pipe locators. Due to its strength, durability and conservative design, ductile cast iron has been the pipe of choice for many years to prevent surges and increase pressure loads.

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• Health and Safety

Production of Ductile iron pipe does not release dangerous chemicals like vinyl chloride, dioxin or ethylene dichloride. Ductile iron pipe does not absorb toxins like plastic pipe and provides better protection against drinking water contamination. Ductile iron pipe is safer to install and maintain than plastic pipe, which is more prone to catastrophic installation and operational failures causing injuries to workers and damage to property. For workers who cut and beat ductile iron pipes on site, the installation is simple and safe. The ductile iron pipe is strong and durable, and will not be damaged during operation and installation. 

• Longer Life Cycle

Ductile iron pipe requires very little maintenance and has an expected service life of at least 100 years. Ductile iron pipe provides significant cost savings and benefits compared to plastic pipe, which has an average service life of 55 years.According to a recent report by the American Water Works Association, the expected service life of modern ductile iron pipes is at least 105 years. There are more iron pipes in service than any other pipe, and ductile iron pipes are currently the longest service life of any material on the market. A longer life cycle saves money and is better for the environment. It also means fewer interruptions, fewer replacements, and more peace of mind for local communities.

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The Basics of Ductile Iron Pipe

Introduced into the U.S. marketplace in , ductile iron pipe (DIP) is pressure pipe commonly used for pressurized water transmission and sewer force mains.

The predominant wall material is ductile iron, a spheroidized graphite cast iron, although an internal cement mortar lining usually serves to inhibit corrosion from the fluid being distributed. Various types of external coating are also used to inhibit corrosion from the environment.

Ductile iron pipe is a direct development of earlier cast iron pipe. Ductile iron has proven to be a better pipe material, being stronger and more fracture resistant; however, like most ferrous materials, it is susceptible to corrosion and retains some brittle characteristics.

Although ductile iron is commonly used in water systems, it has several advantages and disadvantages that owners should factor into its long-term management.

Advantages

  • Greater ductility than cast iron
  • Greater impact resistance than cast iron
  • Greater strength than cast iron
  • Lighter and easier to lay than cast iron
  • Simplicity of joints
  • Joints can accommodate some angular deflection
  • Low pumping costs due to large nominal inside diameter

Disadvantages

  • Similar corrosion rate to cast iron and steel pipe
  • Prone to external and internal corrosion
  • Internal and external protection systems required
  • Limited number of protection systems available
  • Polyethylene wrappings can be damaged

How Does DIP Fail?

Like every pipe material, DIP has specific failure modes and indicators that the pipe is nearing failure. Corrosion is the primary cause of failure for any metallic pipe material. There are three types of failures primarily seen in DIP.

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Break Failure

  • Internal pitting and graphitization corrosion can lead to ductile iron failure. Indicators that this is occurring are lining damage, wall loss from internal pitting, graphitization, leaks, excessive external loads, and pressure variations.
  • External pitting and graphitization corrosion is another type of break failure in DIP. Indicators that this is occurring are damage to the pipeline coating, wall loss from external pits, graphitization (hard to detect), leaks, external loads, and pressure variations.

Structural Failure

  • Pipe movements from thermal variations, seismic shifts, or external loading can lead to structural failure. The indicators that this type of problem may be occurring are joint leaks, poor bedding, or pipe movement.
  • Thermal contraction, poor support leading to movement, or internal pressure can also result in structural failure. The indicators of this failure mode are circumferential cracks, frost regions, leaks, pipe movements, and expansive clays.
  • Internal pressures, external loadings, and thermal stresses can be identified by longitudinal cracks, frost regions, and changing internal or external loads.
  • Leadite joints can lead to eventual structural failure and are identified by cracking at the bell of the pipe.

Leaks