We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What Is the Moody Chart?

By B. Turner
Updated May 17, 2024
Our promise to you
About Mechanics is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At About Mechanics, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

The Moody chart is a tool that is widely used in plumbing and piping work. This resource is valued by everyone from piping designers and manufacturers to plumbers and installers. Using this chart, piping professionals are able to quickly and easily determine how the friction created by the pipe walls impacts flow rates, pressure and other operating features within a plumbing system. The Moody chart, or Moody diagram dates back to the 1940s, and has changed little since that time.

L.F. Moody developed the Moody chart back in the 1940s. It was first published by the American Society of Mechanical Engineers (ASME), in an industry journal. Since that time, the Moody diagram has become an important tool for plumbers and piping designers throughout the world. It can be found in many textbooks related to these subjects, and is also used in the mechanical and chemical engineering fields. Today this chart is included in many common industry publications and handbooks used by plumbing professionals.

The Moody chart offers a graphical representation of the Moody friction factor, or Moody friction coefficient, which is often represented by the symbol "f." The diagram illustrates the relationship between this factor, the Reynolds number, which indicates the type of flow, and the roughness of the pipe. As piping professionals use the complex Darcy-Weishbach formula to calculate pressure loss along a piping run, they can simply refer to the Moody chart to find several important values that are needed when using this formula.

In addition to allowing users to directly determine the Moody friction factor or calculate pressure loss, the Moody chart is a valuable tool for determining many other kinds of information about a plumbing system. Using this information in this diagram, plumbers can estimate flow rate and pressure changes as fluid travels along a pipe. They may also rely on this chart to extract information like the pipe diameter, the proper pipe material to use, or the best length for the plumbing run.

Professionals in many different industries rely on the information provided in the Moody diagram to successfully design and install piping systems. This chart is used in water distribution and sewage system design, and also serves as a common resource in the sprinkler industry. It is helpful to designers and installers working in the oil and gas distribution industries, and also has applications in refrigeration, chemical distribution, and manufacturing. Almost any firm that uses hydraulic or pneumatic tubing or piping may refer to the Moody chart when designing or maintaining piping systems.

About Mechanics is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.

About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.