Pipe Schedule Chart
A Comprehensive Guide to Pipe Sizes, Schedules, and Dimensions
At Tube Aligen Pro, Our mission to provide accurate and updated information. The Pipe Schedule Chart is an indispensable tool in industries ranging from plumbing to the oil and gas industry.
It standardizes pipe dimensions, ensuring compatibility, safety, and efficiency. This guide explores the fundamentals of pipe schedules, steel pipe dimensions, and how to interpret chart for optimal project outcomes.
What is Pipe chart schedule
A pipe diameter chart defines the relationship between Nominal Pipe Size (NPS), outer diameter (OD), and wall thickness. This pipe size charts categorize pipes into schedules (e.g., Sch 40, Sch 80) to indicate their pressure-handling capabilities and applications.
There are two Commonly used standers in USA
ANSI (American National Standards Institute)
ANSI is a private nonprofit organization that oversees the development of voluntary consensus standards for products, services, processes, and systems in the United States.
ASME (American Society of Mechanical Engineers)
ASME is a professional association focused on mechanical engineering and multidisciplinary technical fields.
Key Components of a Piping Schedule Chart
Schedule pipe
This chart cover:
- Schedule 10 Pipe Dimensions
- Schedule 40 Pipe Dimensions
- Schedule 80 Pipe Dimensions
- Schedule 160 Pipe Dimensions
Derived from the formula Schedule=1000×(P/S), where P is pressure and S is allowable stress.
Nominal Pipe Size (NPS): A standardized labeling system for pipe diameters. For example, a “2-inch pipe” refers to its NPS, not its exact dimensions.
Outer Diameter (OD):
Measured in millimeters or inches, OD remains constant for smaller pipes (NPS ≤ 12) but aligns with NPS for larger sizes (NPS ≥ 14).
Wall Thickness:
Determines strength and pressure resistance. For instance, Sch 40 pipe dimensions is thinner than sch 80 pipe thickness, making the latter suitable for high-pressure systems.
Pipe Schedule Chart – Wall Thickness (NPS 1/8″ to 24″)
Per ASME B36.10M; Sch 10 for NPS 12″ and smaller per ASME B36.19M (10S). Dash = not listed for that size.
Swipe the table sideways to see all schedules →
| NPS (in) | DN | OD (in) | Sch 10 | Sch 40 | Sch 80 | Sch 160 | XXS |
|---|
All wall thickness values in inches. ID = OD − 2 × wall. Design calculations should use 87.5% of nominal wall (12.5% mill tolerance).
POPULAR ENGINEERING CHARTS & CALCULATORS
Nominal Pipe Size
This Diagram explain difference in measuring Nominal Pipe Size (N.P.S.) 14″ and Above O.D. Values are Equal (O.D. = N.P.S.)
For Nominal Pipe Size (N.P.S) 1/8″ to 12″ the N.P.S. and O.D. Values are Different (O.D. >N.P.S. >I.D)
Schedule 40 vs Schedule 80: ID and Weight for Common Sizes
| NPS (in) | Sch 40 ID (in) | Sch 40 weight (lb/ft) | Sch 80 ID (in) | Sch 80 weight (lb/ft) |
|---|---|---|---|---|
| 1/2 | 0.622 | 0.85 | 0.546 | 1.09 |
| 1 | 1.049 | 1.68 | 0.957 | 2.17 |
| 2 | 2.067 | 3.65 | 1.939 | 5.02 |
| 4 | 4.026 | 10.79 | 3.826 | 14.98 |
| 6 | 6.065 | 18.97 | 5.761 | 28.57 |
| 8 | 7.981 | 28.55 | 7.625 | 43.39 |
Weights are plain-end carbon steel. For stainless steel multiply by about 1.02, or use our Pipe Weight Calculator for any size and material. For the full DN15 to DN600 metric list see Standard Pipe Sizes in mm, and download the Pipe Schedule Chart PDF for the shop floor.
Guide to Pipe Schedule Chart
An important tool in the piping, plumbing, and industrial engineering world is the pipe schedule chart. This standardized data is important for professionals who are inclined to select the most appropriate pipes for their application. From calculating pipe wall thickness to working with steel pipes and comprehending nominal pipe size chart (NPS), this guide will provide more light on all you need to know.
What Is a Pipe Schedule Chart?
Tube schedule chart show the relationship between nominal pipe size (NPS), outer diameter (OD), and wall thickness. These pipe schedule chart allow users to identify the essentials like pipe schedule which governs the strength, and durability of the pipe. Standardization in pipe sizes chart ensures uniformity in the industries, hence, making them the most valuable for engineers, architects, and contractors.
Understanding the Piping Schedule Chart
The piping schedule chart categorizes pipes based on their NPS and wall thickness. It is difficult to ensure that the pipe can withstand the required pressure. Below is an example of what a typical pipe size chart includes:
- NPS (Nominal Pipe Size): Defines the approximate diameter of the pipe.
- Outer Diameter (OD): The external measurement of the pipe, often presented in millimeters for global standardization
- Wall Thickness: The thickness of the pipe’s wall, which determines its strength and pressure-handling capacity.
Why Use a Pipe Size Chart?
The pipe size chart makes it easy to refer and select all information at once. Pipe dimension details for steel pipes, wall thickness, and standard pipe sizes in millimeters are included within the compatibility of many systems. Engineers often cross-reference this with the pipe weight calculator to know the load requirements for precise project planning. This would come in handy for oil and gas, construction, and industries in manufacturing.
Schedule 40 VS 80
Steel pipe schedule 40 vs 80 differs mainly in wall thickness and according the pressure rating. Schedule 40 for low-pressure use, while schedule 80 for higher-pressure applications.
Schedule 40 pipe thickness
The thickness varies depending on the pipe’s diameter,
To ensure complete system compatibility, selecting the right piping accessories is just as critical as the pipe schedule itself. You can find detailed specifications for matching components in our comprehensive guide on Standard Flange and Valve Sizes, which helps streamline your procurement and assembly process.
Standard Pipe Sizes in mm
Pipes are categorized not just by NPS but also by their outer diameter and thickness in millimeters. For example:
For a complete piping schedule chart PDF, you can download online resources to keep a handy reference.
Pipe Wall Thickness Chart and Pipe OD Chart in mm
The pipe wall thickness chart complements the pipe OD chart in mm to ensure you clearly understand the specifications for different schedules like Sch 10, Sch 20, and Sch 40. For instance:
- Sch 40 Pipe Thickness: Known for being a balanced choice for strength and cost.
- Sch 80: Offers a thicker wall for high-pressure applications.
Applications of the Steel Pipe Size Chart
Steel pipes are widely used in industries due to their durability and resistance to pressure. The steel pipe size chart ensures:
- Correct fitting for industrial and residential applications.
- Accurate pressure handling for pipelines.
- Consistency in manufacturing and design processes.
Benefits of Using the Nominal Pipe Size Chart
- Ease of Selection: The NPS pipe chart ensures users can quickly identify the right pipe for their project.
- Standardization: Uniform sizing across manufacturers reduces compatibility issues.
- Cost Efficiency: Prevents over-specification, saving on unnecessary material costs.
Frequently Asked Questions
What is a pipe schedule chart?
A pipe schedule chart is a reference table that lists outside diameter, wall thickness, inside diameter and weight for each nominal pipe size and schedule. It is based on ASME B36.10M for carbon and alloy steel and ASME B36.19M for stainless steel.
What does Schedule 40 mean?
Schedule 40 is a standard wall thickness for a given pipe size. For example, a 2″ Sch 40 pipe has a 0.154 in (3.91 mm) wall and a 2.067 in bore. It is the most common schedule for water, air and general utility piping.
Is Schedule 80 thicker than Schedule 40?
Yes. For the same NPS, Schedule 80 always has a thicker wall than Schedule 40, so it handles higher pressure but has a smaller inside diameter and weighs more.
Does the outside diameter change with pipe schedule?
No. The OD is fixed for each nominal size. A higher schedule adds wall thickness inward, which reduces the inside diameter. This is true for all sizes, including NPS 14″ and above.
What is the difference between Sch 40 and STD?
They are identical up to NPS 10″. From NPS 12″ upward, STD stays at 0.375 in (9.53 mm) while Sch 40 keeps getting thicker.
What do 10S, 40S and 80S mean?
The “S” marks stainless steel schedules under ASME B36.19M. They usually match the carbon steel schedule of the same number, but 80S differs from Sch 80 from NPS 10″ up, and 40S differs from Sch 40 from NPS 12″ up.
How do I convert NPS to DN?
Multiply the NPS by roughly 25 and round to the standard DN. NPS 1/2″ = DN 15, NPS 1″ = DN 25, NPS 2″ = DN 50, NPS 4″ = DN 100 and NPS 12″ = DN 300.
How much pressure can Schedule 40 pipe hold?
It depends on size, material and temperature. Using Barlow’s formula, a 2″ Sch 40 A106 Grade B pipe works out to about 2,270 psi at ambient temperature before corrosion allowance. Larger sizes of the same schedule hold less pressure.
Is a PVC Schedule 40 pipe the same size as steel Schedule 40?
The OD matches, so fittings line up, but the pressure rating does not. PVC is far weaker and loses strength quickly as temperature rises.
Where can I download a pipe schedule chart PDF?
You can download our free pipe schedule chart PDF from this page and print it for site use.
Are ASME and European (EN) pipe sizes the same?
Mostly, but not always. DN 15, 50 and 150 share the same OD, while DN 65 is 73.0 mm under ASME and 76.1 mm under EN 10220, and DN 125 is 141.3 mm versus 139.7 mm. Always confirm which standard the drawing calls for.
Conclusion
A pipe schedule chart is a crucial tool for selecting the correct pipes based on nominal pipe size, wall thickness, and outer diameter. Whether you’re working on a complex industrial project or a simple home renovation, referencing a sch pipe chart ensures accuracy and reliability. For a detailed guide, consider downloading a piping schedule chart PDF for quick and easy access.
By understanding the basics of pipe size, steel pipe dimensions, and standard pipe sizes in mm, you’ll be better equipped to choose the right materials for your needs.
Need to match your pipe dimensions with the correct threaded fittings? Check out our professional NPT Thread Size Chart for all standard pipe sizes. It’s the perfect companion tool to our Pipe Schedule data for ensuring mechanical assembly accuracy.
