Ductile Iron Pipe
Strength and Durability for LiFe®
From its inception more than 100 years ago, DIPRA has provided accurate, reliable, and essential engineering information about cast iron — and now Ductile iron — pipe to a wide variety of utilities and consulting engineers.
How Can We Help You?
Environmental Commitment
Read about DIPRA’s commitment goals of compliance, protection, and improvement.
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DIPRA Staff
Our team is comprised of a diverse group of professionals dedicated to informing and educating about the benefits of Ductile iron pipe.
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DIPRA's Commitment
Help citizens, decision-makers, and professional engineers understand and appreciate the many advantages that Ductile iron pipe offers to water and wastewater utilities.
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Member Companies
Learn about the ductile iron manufacturing companies whom DIPRA works in close collaboration with.
Meet the Team
Century Club
DIPRA sponsors the Cast Iron Pipe Century Club, started in 1947, and the Sesquicentennial Club, formed in 1989.
Century Club MembersAlliances
DIPRA partners with dedicated organizations to continue helping utility leaders, elected officials, and professional engineers.
Check out our Member Companies
Life Cycle Cost Analysis
Calculate the long-term value of Ductile iron pipe for specific installation scenarios. (Log-in needed)
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Hydraulic Analysis & Greenhouse Gas Emissions
See how typically larger than nominal inside diameter of Ductile iron pipe compares to other pipe material.
Compare
Calculators
DIPRA has five free web-based calculators that are useful tools for designing and specifying Ductile iron pipe.
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Thickness Design
Determine the most appropriate class of Ductile iron pipe to choose for a given project.
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Thrust Restraint
Unit frictional force, unit bearing resistance, and required restrained length for the most common restrained joint designs is determined with this calculator.
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Design on Supports
Determine support dimensions and the class of pipe needed to control beam deflection, beam stress and stress at supports.
Calculate
Pipe Material Comparison
There are various pipe materials available, choosing the wrong one can result in premature failures and unanticipated costs.
Compare Options
Value
Ductile iron pipe’s material production, installation, operation and maintenance, and end-of-life costs all contribute to its overall value.
Read MoreLongevity
Modern, domestic Ductile iron pipe has an anticipated life of more than 100 years of service.
Longevity
Environmental Benefits
Ductile iron pipes contain at least 90% recycled materials and the pipes themselves are 100% recyclable. No hazardous chemicals are released in the manufacturing process.
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Sustainability
Ductile iron pipe’s sustainable attributes, from materials it’s made of and its manufacturing process, to its positive reputation in the environmental community, are commendable.
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Resilience
Find out how Ductile iron pipe withstands sudden shocks, environmental hazards, and everyday stresses.
Proven Resilience
Safety
The manufacturing process and ease of installation and tapping in the field are added bonuses to the safe drinking water that Ductile iron pipe delivers.
Read about safetyCalculators
DIPRA has five free web-based calculators that are useful tools for designing and specifying Ductile iron pipe.
START CALCULATING
Materials
Nearly seven decades of field experience have proven Ductile iron pipe's strength, durability, reliability and resilience in service.
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ALL TECHNICAL RESOURCES
All of DIPRA’s technical resources can be found here for your access and reference.
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Design Steps
Learn about each phase of planning and design, installation and asset management.
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KNOWLEDGE PIPELINE
A video series to provide engineers valuable technical information and real-life application examples to help advance their engineering careers.
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Contact a Regional Engineer
DIPRA's REs are knowledgeable and well-versed in the unique infrastructure and environmental conditions of different areas of the country.
Contact an RE
Where We'll Be
DIPRA’s Regional Engineers participate in conferences and water industry events throughout the year.
Events Calendar
Ask an Engineer
DIPRA’s expert Regional Engineers are standing by to answer all your questions about the design and application of Ductile iron pipe.
Ask us a Question
Support the Issues
Be active in protecting local and professional control in making materials decisions for water infrastructure projects.
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Local Choice
Learn about the fight for communities to maintain local choice and control in designing water projects that will best serve their needs.
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Legislative and Regulatory Affairs
Water infrastructure investment is needed to benefit generations to come. Find out what’s happening at the Federal and State levels.
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Technical Resources
A Research Oriented Organization
We are a technically based, research-oriented organization providing a variety of technical brochures and publications, representation on standards-making committees, technical research on a variety of applications-based topics such as corrosion control and design of Ductile iron pipe, and personal technical service through our regional engineer program.
Member Companies
About Our Members
DIPRA is a non-profit association supported by all of the Ductile iron pressure pipe manufacturers in North America. While DIPRA member companies have different names and locations, they all have one thing in common: a commitment to produce and deliver the finest quality water and wastewater pipe material in the world, Ductile iron pipe.
Local Choice
Ductile Iron Pipe Advocates
Because Ductile iron pipe is the best answer to America’s water infrastructure needs, DIPRA’s mission is to help citizens, decision-makers and professional engineers understand and appreciate the many advantages that Ductile iron pipe offers to water and wastewater utilities and their customers. We invite consulting and utility engineers to take advantage of our many services, including our in-field regional engineers and technical staff.
Greener Initiatives
Our Environmental Commitment
The member companies of the Ductile Iron Pipe Research Association will uphold the following principles in all of their business activities through management commitment, employee involvement and allocation of adequate personnel and other resources:
Compliance
We will manage our business activities to meet all governmental laws and regulations as well as internally established environmental, health, and safety requirements. Our goal is 100% compliance, 100% of the time.
Improvement
We will continually improve our environmental, health, and safety performance with a primary focus on setting and achieving goals and objectives.
Protection
We will conduct our activities in a responsible manner to protect our employees, the public, and the environment by focusing on injury and illness prevention, pollution prevention and minimizing impacts and risks to the environment from our operations.
"In my 33 years in the water infrastructure industry, I have not found any other material stronger than Ductile iron pipe."
Gregg Loesch
Past Chair of the Congressional Fire Service Institute and a former firefighter/EMT in Baltimore County, The Washington Times
Resources
Resouces
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