Ductile Iron Pipe for Sewer Systems

Ductile iron pipes are known for their advantages, especially compared to cast iron. They can be used even in sewer systems despite the complex structure these systems have. Professionals generally use Ductile Iron Pipe for sewers. There are plenty of reasons for that, but the most important ones are strength, flexibility, and durability. Ductile iron pipes for sewers are special due to several categorizations they have. Sizes, classes, and rating pressures are how these pipes are divided.

For the installation process of ductile iron pipe for sewer, the key steps are excavation, pipe preparation, and assembly, positioning, joint connections and backfilling, and finally, testing and restoration. Maintenance of these pipes also requires several steps. These steps include regular inspections, cleaning, protective coatings, proper installation, and flushing guidelines. Having a careful look at all the required processes results in having a reliable system.

Why Do Professionals Use Ductile Iron Pipe for Sewer?

According to McWane Ductile, professionals choose to use ductile iron pipe for sewers due to some specifications. These specifications ensure the longevity of the environmental benefits of ductile iron and ductile iron pipe. That is why ductile iron is a popular option for professionals.

Strength

Ductile iron pipe shows much higher tensile strength and yield strength. This strength makes them capable of handling and withstanding heavy external loads and pressure. That is why ductile is a wise choice for iron pipes to be applied to sewers. They are ideally useful in underground sewer systems as pipes endure a great amount of stress in these systems.

Flexibility

Ground movement wouldn’t cause any cracking or breaking, as ductile iron pipes are fairly flexible. The flexibility of ductile iron reduces the damage risk caused by soil settlement or seismic activity. As a result, the longevity and integrity of the sewer system are ensured.

Durability

A protective oxide layer covers the ductile iron pipe surface. This layer gives excellent corrosion resistance to ductile iron pipes. The corrosion resistance makes it completely reasonable to use ductile iron for sewers. It makes ductile iron notably resistant to the aggressive environment of the sewer system, such as corrosive liquids and gasses. The expenses of maintenance and replacements are reduced by this cost-effective sewer piping as the durability of iron pipes ensures long-term sewer pipe solutions.

 

This table fairly shows the technical specifications of using ductile iron pipe for sewer infrastructure compared to other materials.

 

Property	Ductile Iron Pipe	PVC Pipe	Concrete Pipe	Steel Pipe
Material Composition	Iron, carbon, graphite, magnesium	Polyvinyl chloride (PVC)	Portland cement, aggregate, water	Iron, carbon, and other elements
Strength	High tensile strength	Good tensile strength	Good compressive strength	High strength
Corrosion Resistance	Moderate	Excellent resistance to chemical corrosion	Good resistance to chemical corrosion	Requires protection (e.g., galvanizing)
Weight	Heavy	Lightweight	Heavy	Moderate to heavy (depending on thickness)
Durability	Long lifespan (100+ years)	Good durability (50+ years)	Good durability (50+ years)	Long lifespan (50+ years) with proper maintenance

Are Ductile Iron Pipes for Sewer Special?

Ductile iron pipe for sewer is special in design and specifications. These factors are streamlined so that these pipes perform perfectly in wastewater systems. The different sizes, classes, and pressure ratings make these pipes suitable for use in waste management systems.

Size

Ductile iron pipes for sewers have different diameters to adjust various flow capacities. These diameters generally range from 3 to 64 inches, which is equal to 76 mm to 1600 mm.

Classes

Ductile iron pipes for sewer systems come in two classes: pressure class and thickness class. These two classes define the internal working pressure and wall thickness. Pressure classes vary from Class 5 to Class 56, which is equal to 350 psi to 560 psi. Moreover, thickness classes vary from Class 18 to Class 64, which shows a thickness of 18 inches to 64 inches.

Pressure Ratings

The pressure rating of ductile iron sewer pipe is mainly deduced from its class. Higher classes represent higher internal working pressure. The pressure rating ensures that the pipe can handle all the pressure requirements of the wastewater and sewer system.

How Do You Install Ductile Iron Pipes for Sewer?

Referring to Trenchless Pedia, installing ductile iron pipe for sewer requires a few key steps. These steps will ensure appropriate assembly, positioning, and joint connections. Also, following the manufacturer’s installation guidelines is essential.

Excavation

As the first step, dig the trench with the right dimensions, depth, and width. The width of the trench must be enough to adjust the pipe and any other equipment required for the installation.

Pipe Preparation and Assembly

Before starting the main process, thoroughly inspect the pipes. First, clean the pipe ends and search for defects. Then, lubricant was applied to the gasket and pipe ends to facilitate joint assembly properly. Insert the spigot end of one pipe into the bell end of another to connect the pipe sections. Be careful that the gasket is properly seated and compressed.

Positioning

Lay the assembled pipe sections into the trench. When lowering the pipe sections, maintain the right alignment and grade. The pipes must be supported by suitable bedding materials. Materials like gravel or crushed stone could provide stability and protect them from external loads and forces.

Joint Connections and Backfilling

Connecting pipe sections requires appropriate joint types. Push-on, mechanical, and restrained joints are among the various types of joints that can be utilized to connect pipe sections securely. This way, the connections will be leak-free and secure, which is essential. After placing the pipes, fill the trench with the backfill material you have decided on for the project. Compact the backfill in layers so that there is adequate support prepared for the pipes.

Testing and Restoration

After the installation process is complete, perform two essential tests: pressure tests and leak detection tests. These tests will check the integrity of pipe sections and joint connections. After ensuring that the results are desirable, restore the site to its original condition and let the installation procedure finish. In some cases, resurfacing the road or ground surface may be required.

Maintenance Tips for Ductile Iron Sewer Pipes

A few tips should be implemented to ensure reliable sewer system piping and long service life for the piping and fittings.

Regular Inspections

Inspections must be done regularly to check for potential hazards or issues. Any signs of wear and tear must be detected as soon as possible. This way, by having early detections, you will have enough time for repairs and prevent any further damage.

Cleaning

Pipes must be regularly cleaned. Hydro-jetting can improve the process of cleaning pipes from debris, grease, or any other buildup that might lead to clogs and blockages.

Protective Coatings

Protective coatings or linings for all parts of the pipes are the best options to prevent corrosion. This process extends pipes’ lifespan and helps them maintain proper functionality for a long time.

Proper Installation

The pipes must be installed according to standards and manufacturer’s guidelines. Proper installation reduces the risk of future problems considerably, and the longevity of the sewer system is guaranteed.

Flushing Guidelines

Proper flushing guidelines are required. It is also crucial to educate residents and users on how to use the flush and what to flush down the system. Non-degradable products and items such as wipes, grease, or feminine hygiene products must not be flushed down to prevent any blockage or damage in the system.

Final Words

Ductile iron pipe for sewer systems has its own specifications and properties. Even the overall maintenance and installation processes can be specific. Proper and fitting pipes must be chosen for each project, paying proper attention to deciding the right size, class, and pressure ratings. Constructing a reliable sewer system depends on the piping. By following crucial tips, make the most out of beneficial technical specifications of ductile iron pipe for sewer.