In the vast world of pipes and fittings, understanding the meaning behind technical terminology is crucial. One such term, widely used in the industry, is NPS (Nominal Pipe Size). As a leading provider of pipe fittings and equipment, YANHAO takes pride in sharing comprehensive knowledge about NPS and its significance. This blog aims to shed light on NPS, offering a deep and wide-ranging exploration. With a commitment to expertise, authoritativeness, and trustworthiness, YANHAO presents this informative guide to help you navigate the complexities of pipe sizing. So, let’s delve into the world of NPS and discover how it influences the entire pipeline system.

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What is NPS?

NPS, or Nominal Pipe Size, is a standard numerical designation used to categorize pipes based on their approximate inside diameter (ID). It plays a pivotal role in the pipe industry by providing a consistent method for referencing and selecting pipe sizes.

However, it’s important to note that NPS does not represent the actual outer diameter (OD) of the pipe. Instead, it serves as a nominal or approximate value. The actual OD can vary based on different pipe schedules and manufacturing tolerances. Understanding this distinction is significant while specifying and fitting pipes accurately.

At YANHAO, we recognize the importance of NPS in pipe systems. That is why we offer a comprehensive range of pipe fittings specifically designed to suit various NPS sizes. Whether you require flanges, elbows, tees, reducers, or other connectors, our products are available to meet your specific NPS requirements. We ensure the highest quality and precision, adhering to industry standards and exceeding customer expectations.

NPS vs. DN (Diameter Nominal)

It’s important to understand that NPS and DN are two different systems of designating pipe sizes. NPS is predominantly used in the United States, while DN (Diameter Nominal) is widely used globally, especially in countries following the metric system.

NPS is based on the approximate inside diameter of the pipe, whereas DN is based on the approximate outside diameter. This fundamental difference in measurement criteria can sometimes cause confusion when converting between NPS and DN sizes.

At YANHAO, we recognize the significance of both NPS and DN in the industry. We have a deep understanding of these standards and their implications for our global clientele. Whether you require fittings for NPS or DN sizes, we have the expertise and capability to cater to your needs. Rest assured, our products are designed and manufactured with the precise measurements required for optimal compatibility and performance in both NPS and DN systems.

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NPS Conversion Chart

To help readers understand the correlation between NPS and actual pipe sizes, here is a conversion chart:

NPSActual Pipe OD (inches)
1 1.315
1 1/41.660
1 1/21.900
2 1/22.875
3 1/24.000
NPS Conversion Chart

YANHAO’s Proficiency in Catering to Multiple Measurement Standards:

At YANHAO, we pride ourselves on our proficiency in catering to multiple measurement standards, including NPS, DN, and others. We understand the importance of accuracy and precision when it comes to pipe fittings, and we ensure that our products are meticulously manufactured to meet the required specifications across different measurement standards.

With our extensive experience in the pipe industry, we have developed the capability to provide high-quality fittings for various measurement systems. Whether you require fittings based on NPS, DN, or any specific measurement standard, you can trust YANHAO to deliver reliable and precise solutions. Our commitment to adhering to these standards enables us to meet the diverse needs of our global customers with the utmost professionalism and efficiency.

Common Applications of NPS

NPS plays a crucial role in various industries that rely on pipe systems for fluid transportation or containment. Some common applications where NPS is widely used include:

  1. Oil and Gas Industry: NPS is essential for offshore and onshore drilling, pipeline transportation, refineries, and petrochemical plants.
  2. Petrochemical Industry: NPS is critical in the production of chemicals, plastics, and other petroleum-based products.
  3. Power Generation: NPS is necessary for power plants, including fossil fuel power plants, nuclear power plants, and renewable energy facilities.
  4. Water and Wastewater Treatment: NPS is utilized in water treatment plants, wastewater treatment facilities, and distribution systems.
  5. Construction and Infrastructure: NPS is significant in building construction, plumbing, HVAC systems, and infrastructure projects.

YANHAO’s Experience in Serving Relevant Industries:

YANHAO has extensive experience in serving industries such as oil and gas, petrochemical, power generation, water treatment, and construction. We understand the unique challenges and requirements of these sectors, especially regarding pipe systems and fittings.

Our expertise enables us to provide customized solutions that meet industry standards and specifications. Whether it’s designing fittings for high-pressure pipelines, corrosion-resistant materials for aggressive environments, or complying with specific regulatory requirements, YANHAO is well-equipped to handle diverse applications in these industries.

We take pride in our track record of delivering exceptional quality products and reliable services to our clients in the oil and gas, petrochemical, power generation, and other relevant industries. With YANHAO, you can trust that our products will meet your NPS and industry-specific needs with utmost accuracy and reliability.

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Importance of Choosing the Right NPS

Choosing the correct NPS (Nominal Pipe Size) is crucial for ensuring optimal performance, flow rates, and pressure ratings in pipe systems. Here’s why it’s essential:

  1. System Efficiency: The proper NPS selection plays a significant role in maintaining system efficiency. A correctly sized NPS ensures that the flow rates within the pipes are within the desired range, minimizing energy losses and maximizing system performance.
  2. Flow Rates: Choosing the right NPS helps maintain the required flow rates for the intended application. An undersized NPS can cause flow restrictions, resulting in reduced efficiency and performance. On the other hand, an oversized NPS can lead to excessive flow rates, potentially damaging the system or causing operational issues.
  3. Pressure Ratings: The selected NPS must be able to handle the required pressure ratings within the system. Using an NPS with an inadequate pressure rating can lead to leaks, bursts, or other safety hazards. Selecting the appropriate NPS helps ensure the integrity and reliability of the pipe system under the specified pressure conditions.

Reliability and Professional Guidance from YANHAO:

When it comes to selecting the right NPS, you can rely on YANHAO’s expertise and professional guidance. We understand the importance of accurate pipe sizing and its impact on system performance. Our team of experienced professionals can provide comprehensive support and guidance throughout the selection process.

At YANHAO, we prioritize customer satisfaction and are committed to delivering reliable products that meet the exact specifications of your application. Whether you’re dealing with a complex project or require assistance in determining the appropriate NPS, our knowledgeable staff can offer expert advice to ensure you choose the optimal NPS for your specific needs.

By partnering with YANHAO, you can have confidence in our ability to provide reliable solutions, professional guidance, and exceptional quality products that meet your desired NPS requirements.


In conclusion, selecting the right NPS (Nominal Pipe Size) is of utmost importance for optimal performance, flow rates, and pressure ratings in pipe systems. Choosing an incorrect NPS can lead to inefficiencies, compromised system integrity, and potential safety hazards.

With YANHAO, you can trust in our extensive experience and expertise in serving industries such as oil and gas, petrochemical, power generation, and more. We understand the unique requirements of these industries and the critical role that NPS plays in their operations. Our reliable products, customized solutions, and professional guidance ensure that you can select the appropriate NPS for your specific application, promoting system efficiency and reliability.

YANHAO’s commitment to customer satisfaction, exceptional quality, and adherence to industry standards make us a trusted expert provider of pipe fittings worldwide. From initial consultation to project execution, we are dedicated to delivering the highest level of service and ensuring that your NPS needs are met with precision and accuracy.

Choose YANHAO as your partner in pipe fittings and experience the confidence that comes from working with a reliable, experienced, and trusted provider.

Lewis Liu

Hello, I am Lewis Liu, a professional sales engineer with over ten years of experience in the flange fittings industry. I am highly knowledgeable in flange selection, installation, and maintenance. I am passionate about providing customers with the best solutions to ensure their pipeline systems run smoothly, safely, and reliably.

If you have any questions or concerns regarding flange fittings for your pipelines, whether it’s about selection, material choice, specification requirements, or any other aspect, please feel free to contact me at any time. I am committed to offering professional advice and assistance to help you make informed decisions and meet your needs.

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