Omar Khalid
Ductile iron (DI) pipes are made from ductile cast iron and are commonly used for potable water transmission and distribution. DI pipes are known for their strength and durability, making them a popular choice for various applications, including high-profile projects such as bridge installations. One of the key advantages of DI pipes is their ability to withstand temperature changes and ground shifts, which has led to their preference over PVC pipes in certain installations. DI pipes are also non-combustible, providing a safe and reliable water supply in emergencies such as fires.
| Characteristics | Values |
|---|---|
| Material | Ductile iron |
| Use | Potable water transmission and distribution |
| Strength | Very strong |
| Durability | Long-lasting |
| Weather conditions | Can be assembled in nearly all weather conditions |
| Temperature change | Less affected by temperature change |
| Lifespan | Over 100 years |
| Safety | Non-combustible |
| Fire safety | Can withstand the stress caused by fires |
| Sustainability | Certified as a sustainable product by the Institute for Market Transformation to Sustainability |
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What You'll Learn
DI pipe is non-combustible, unlike PVC pipe
DI pipe, or ductile iron pipe, is a flexible conduit made from recycled iron and steel scrap. It is a sustainable product that is safe for public health and the environment. DI pipe is also non-combustible, making it a reliable option for providing water for firefighting. It can withstand the stress caused by fires, and its non-combustible nature means it does not release harmful gases when exposed to heat.
On the other hand, PVC, or polyvinyl chloride, pipe is made from chlorine (derived from salt) and carbon (derived from oil and gas via ethylene). PVC is a combustible material that has been implicated in causing severe problems in firefighting. When PVC melts in a fire, it releases hydrogen chloride gas, which can be harmful to firefighters and others in the vicinity.
The difference in combustibility between DI and PVC pipes is a critical factor to consider when choosing the appropriate piping material for a project. DI pipe's non-combustible nature makes it a safer option, especially in high-risk environments or where fire safety is a priority. This includes installations such as bridge crossings, fire hydrants, and power plant applications, where DI pipe is often the preferred choice due to its reliability and ability to withstand extreme conditions.
DI pipe's non-combustibility also contributes to its long-term durability and resilience. It is unaffected by temperature changes, maintaining its strength and integrity over a wide range of operating temperatures. In contrast, PVC pipe becomes brittle in cold temperatures and weaker in warmer climates, making it more susceptible to failure under stress.
Additionally, DI pipe's recyclability sets it apart from PVC. DI pipe is made from at least 90% recycled material and can be recycled indefinitely, whereas PVC has a recycled content of nearly zero and can only be down-cycled. This makes DI pipe a more environmentally friendly and sustainable option compared to PVC.
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DI pipe is more resilient to temperature change than HDPE pipe
DI pipes, or ductile iron pipes, are made from ductile cast iron and are commonly used for potable water transmission and distribution. They are known for their strength and durability. DI pipes possess expansion and contraction capabilities, making them suitable for installations that require flexibility, such as bridges.
HDPE pipes, on the other hand, are made from High-Density Polyethylene, which is derived from petroleum and natural gas. These pipes have gained popularity across various industries due to their strength, flexibility, and resistance to chemical corrosion. However, one critical factor that impacts the long-term performance of HDPE pipes is their temperature tolerance.
HDPE pipes have a temperature-dependent behaviour due to their plastic composition. They typically operate within a temperature range of 32°F to 140°F (0°C to 60°C). While they can withstand freezing and sub-freezing temperatures, prolonged exposure to elevated temperatures will cause deterioration, reducing their mechanical strength and service life. This limitation necessitates careful consideration during installation and maintenance to accommodate thermal expansion and contraction, which can affect the formation of stress points and cracking.
In contrast, DI pipes exhibit remarkable resilience to temperature variations. They remain stable and unaffected by temperature changes from -10°F to 150°F, far exceeding the range within which HDPE pipes can operate safely. DI pipes are designed to withstand extreme temperatures, with a proven service life of over 100 years. This durability is attributed to their strong, long-lasting iron composition, which can endure rough handling and varying installation conditions.
The superior temperature resilience of DI pipes is further evident when comparing their expansion and contraction rates. DI pipes are 13 times less affected by temperature change than HDPE pipes. This means that DI pipes can easily absorb temperature variations within their rubber gasket joints, ensuring the pipeline's integrity. On the other hand, HDPE pipes have a higher expansion and contraction rate per 10°F variance, requiring careful design considerations to prevent structural issues.
In summary, DI pipes offer a more robust solution for applications where temperature fluctuations are a concern. Their ability to withstand a broader temperature range, coupled with their durable construction, ensures that they remain unaffected by extreme conditions. This makes DI pipes a preferred choice in critical projects where temperature changes are expected, providing a reliable and resilient option compared to HDPE pipes.
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DI pipe is easier to assemble than HDPE pipe
DI pipes, or ductile iron pipes, are a combination of silicon, carbon, and ductile iron. They are commonly used for potable water transmission and distribution. Ductile iron pipes are simple to install and manage since they are connected via a variety of modes, such as push-on flexible joints, mechanical joints, and flanged joints. DI pipes are also highly resilient under stress and can withstand rough handling. They are also highly resistant to corrosion.
HDPE, or High-Density Polyethylene, pipes are manufactured from ethylene, which is obtained from petroleum and natural gas. They are known for their flexibility and durability, making them suitable for trenchless installation, seismic areas, and climates with potential ground movement due to freeze/thaw cycles and droughts. HDPE pipes can be welded into seamless, leak-free pipe lengths, creating exceptionally strong joints.
However, HDPE pipes require special machinery and training for assembly, as well as optimal weather conditions. The joints of HDPE pipes are typically welded together using butt-fusion welding, which leaves a distinct lip inside and outside the pipeline. This process can be challenging and may require subcontracting third parties at a significant cost.
In contrast, DI pipes use easy-to-assemble push-on rubber gasket joints that do not require specialized machinery or training. These joints allow for expansion and contraction, making them suitable for installations with temperature variations. DI pipes are also less affected by temperature changes, with a rate of only 0.75 inches per 1000 feet of DIP per 10°F swing, compared to 10 inches per 1000 feet of HDPE per 10°F swing for HDPE pipes.
Overall, DI pipes are generally considered easier to assemble than HDPE pipes due to their simple jointing systems, flexibility in installation conditions, and resilience to temperature changes.
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DI pipe is stronger than PVC pipe
DI pipe, or ductile iron pipe, is a flexible conduit made from ductile cast iron. It is commonly used for potable water transmission and distribution. The ductile iron used to manufacture the pipe is characterised by the spheroidal or nodular nature of the graphite within the iron. DI pipes are made from recycled steel and iron and are recyclable themselves. They are also non-combustible and can withstand the stress caused by fires.
PVC, or polyvinyl chloride, is made from chlorine (derived from salt) and carbon (derived from oil and gas via ethylene). It is weak or fragile when compared to DI pipe and has a recycled content of nearly zero. It is also combustible and releases harmful gases when burned.
DI pipes are more durable than PVC pipes. DI pipes have more than 13 times the impact strength, nine times the tensile strength, and four times the burst strength of PVC pipes. DI pipes can also withstand stress, whereas PVC pipes will eventually fail under stress. DI pipes are also less prone to wear and stress than other pipe materials, including PVC.
DI pipes are also more resistant to temperature changes than PVC pipes. PVC pipes become brittle in colder temperatures and weaker in higher temperatures. They can lose up to 34% of their impact strength from exposure to the sun in about a year, whereas temperature changes have little effect on DI pipes.
DI pipes are also easier to assemble than PVC pipes. DI pipes use an easy-to-assemble/disassemble push-on rubber gasket joint, whereas PVC pipes must be welded together with special machinery.
Overall, DI pipes are stronger and more durable than PVC pipes, making them a better choice for high-profile projects such as bridge installations.
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DI water is not suitable for use with galvanized pipes
DI water, or deionized water, is water that has had its minerals removed. It is commonly used in industrial settings and for cooling servers and other electronic equipment. However, it is not suitable for use with all types of piping, especially galvanized pipes.
Galvanized pipes are zinc-coated pipes that are commonly used for water transport, including drinking water. While galvanized pipes are considered safe for drinking water, there are some potential health concerns if the water supply is corrosive due to its acidic condition (low pH). In particular, lead and cadmium, which are known health hazards, may be present as impurities in the zinc used for the galvanizing process. If the water has more than 1.0 mg/L of zinc, there is a risk of lead and cadmium contamination.
When DI water comes into contact with galvanized pipes, it can cause degradation of the pipes over time. This is because the pure water starts to absorb minerals back from the pipes, leading to a process known as "degradation" or "corrosion". As a result, the pipe becomes rigid and weakened, and the water may become contaminated with zinc, lead, and cadmium.
Additionally, the use of PVC solutions with DI water can also cause issues. The Total Organic Carbon (TOC) concentration in the water can increase due to leaching of plasticizers from the PVC piping and the use of solvent cement during piping modifications. This can result in elevated levels of TOC for several days after the modification.
Therefore, it is important to consider the compatibility of DI water with the piping material. For galvanized pipes, DI water is not suitable due to the potential health risks associated with corrosion and the degradation of the pipes over time. It is recommended to use alternative piping materials, such as Teflon or CPVC, that are more compatible with DI water to avoid these issues.
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Frequently asked questions
DI pipe, or ductile iron pipe, is made from ductile cast iron and is commonly used for potable water transmission and distribution.
DI pipe is stronger and more durable than PVC pipe. It is also non-combustible and can withstand the stress caused by fires, making it a safer option. DI pipe is also less affected by temperature change and can be assembled in nearly all weather conditions.
The normal and proven service life of DI pipe exceeds 100 years when installed using "evolved laying practices", such as the use of properly installed LPS (polyethylene encasement).
The standard internal lining for DI pipe is cement mortar, but other options such as polyurethane can also be used.
DI water, or deionized water, is a type of water that has been treated to remove ions and impurities. It is often used in industrial and laboratory settings.
