Complete Guide to Schedule 80 Pipe Dimensions and Specifications

You pick schedule 80 pipe when you need it to be stronger and last longer. This pipe has thicker walls than schedule 40 pipe. Thicker walls help it hold more pressure. For example, a 1-inch pipe in schedule 80 has walls that are 0.154 inches thick. In schedule 40, the wall is only 0.109 inches thick. Schedule 80 can handle about 280 psi of pressure. This makes it good for factories and moving chemicals. It also resists chemicals and heat better than schedule 40. That is why it works well in tough places.

Key Takeaways

• Schedule 80 pipes have thicker walls than Schedule 40 pipes. This helps them handle more pressure and last longer.
• Always check the pressure and temperature needs of your system first. This helps you pick the right Schedule 80 pipe for safety and good performance.
• Use a pipe dimensions chart to learn about the outside diameter, wall thickness, and inside diameter. These things change how much flows through and the pressure the pipe can take.
• Pick the right material for Schedule 80 pipes based on what you need. Stainless steel is good if you want to stop rust. Carbon steel is strong and good for tough jobs.
• Follow the best ways to install and take care of Schedule 80 pipes. This helps them last longer and work safely.

Schedule 80 Pipe Dimensions Chart

ANSI Schedule 80 Steel Pipes-Dimensions
Based on ASTM A53, Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded, and Seamless.

Pipe Size (in)	Diameter (in) (mm)		Nominal Thickness	Transverse Areas (in²) mm²			Length of Pipe (ft persq.foot of surface)		Volume (ft³/ft)	Weight		Number of Threads per inch of Screw
	External	Internal	(in) (mm)	External	Internal	Steel	External Surface (ft)	Internal Surface   (ft)		(Ib/ft)	(kg/m)
1/8	0.41 10.4	0.22  5.59	0.10 2.54	0.13  83.9	0.04  25.8	0.09 58.1	9.43	17.75	0.0003	0.31	0.47	27
1/4	0.54 13.7	0.30  7.62	0.12 3.05	0.23  148	0.07  45.2	0.16 103	7.07	12.65	0.0005	0.54	0.80	18
3/8	0.68 17.3	0.42  10.7	0.13 3.3	0.36  232	0.14  90.3	0.22 142	5.66	9.03	0.0010	0.74	1.10	18
1/2	0.84 21.3	0.55  14	0.15 3.81	0.55  355	0.23  148	0.32 206	4.55	7.00	0.0016	1.00	1.49	14
3/4	1.05  26.7	0.74  18.8	0.15 3.81	0.87  561	0.43  277	0.43 277	3.64	5.15	0.0030	1.47	2.19	14
1	1.32  33.5	0.96  24.4	0.18 4.57	1.36  877	0.72  465	0.64 413	2.90	4.00	0.0050	2.17	3.23	11 1/2
1 1/4	1.66  42.2	1.28  32.5	0.19 4.83	2.16  1394	1.28  826	0.88 568	2.30	2.99	0.0089	3.00	4.46	11 1/2
1 1/2	1.90  48.3	1.50  38.1	0.20 5.08	2.84  1832	1.77  1142	1.07 690	2.01	2.54	0.0123	3.65	5.43	11 1/2
2	2.38  60.5	1.94  49.3	0.22 5.59	4.43  2858	2.95  1903	1.48 955	1.61	1.97	0.0205	5.02	7.47	11 1/2
2 1/2	2.88  73.2	2.32  58.9	0.28 7.11	6.49  4187	4.24  2735	2.25 1452	1.33	1.65	0.0294	7.66	11.40	8
3	3.50  88.9	2.90  73.7	0.30 7.62	9.62  6206	6.61  4265	3.02 1948	1.09	1.32	0.0459	10.30	15.33	8
3 1/2	4.00  102	3.36  85.3	0.32 8.13	12.56  8103	8.89  5735	3.68 2374	0.95	1.14	0.0617	12.50	18.60	8
4	4.50  114	3.83  97.3	0.34 8.64	15.90  10258	11.50  7419	4.41 2845	0.85	1.00	0.0800	14.90	22.17	8
5	5.56  141	4.81  122	0.38 9.65	24.30  15677	18.19  11735	6.11 3942	0.69	0.79	0.1263	20.80	30.95	8
6	6.63  168	5.76  146	0.43 10.9	34.47  22239	26.07  16819	8.30 5355	0.58	0.67	0.1810	28.60	42.56	8
8	8.63  219	7.63  194	0.50 12.7	58.42  37690	45.66  29458	12.76 8232	0.44	0.50	0.3171	43.40	64.59	8
10	10.75  273	9.56  243	0.59 15	90.76  58555	71.84  46348	18.92 12206	0.36	0.40	0.4989	64.40	95.84	8
12	12.75  324	11.38  289	0.69 17.5	127.64  82348	101.64  65574	26.00 16774	0.30	0.34	0.7058	88.60	131.85
14	14.00  356	12.50  318	0.75 19	153.94  99316	122.72  79174	31.22 20142	0.27	0.31	0.8522	107.00	159.23
16	16.00  406	14.31  363	0.84 21.3	201.05 129709	160.92 103819	40.13 25890	0.24	0.26	1.1170	137.00	203.88
18	18.00  457	16.13  410	0.94 23.9	254.85 164419	204.24 131767	50.61 32652	0.21	0.24	1.4180	171.00	254.48
20	20.00  508	17.94  456	1.03 26.2	314.15 202677	252.72 163045	61.43 39632	0.19	0.21	1.7550	209.00	311.03
24	24.00  610	21.56  548	1.22 31	452.40 291870	365.22 235625	87.18 56245	0.16	0.17	2.5360	297.00	441.99

1 in² = 645.2 mm² = 6.452 cm² = 6.452×10-4 m²
1 in = 25.4 mm
1 ft (foot) = 0.3048 m

Download our ansi schedule 80 steel pipes dimensions file

Schedule 80 Pipe Overview

Definition

Schedule 80 pipe means the pipe has a certain wall thickness. This type is used in both metal and plastic pipes. Groups like ASME and ANSI set the rules for these pipes. These rules help you pick the right pipe for your job. They tell you about wall thickness, outside diameter, and other details. Schedule 80 pipes have thicker walls than schedule 40 pipes. This lets them hold more pressure.

Here is a quick look at the main standards that define schedule 80:

Standard	Description
ASME B36.10M	Defines Schedule 80 pipe for carbon and alloy steel pipes
ASME B36.19M	Defines Schedule 80 pipe for stainless steel pipes
ANSI	Sets standardized wall thicknesses for pipes, including Schedule 80
Schedule 80	Thicker wall than Schedule 40, same outer diameter, smaller ID

The outside diameter stays the same for each pipe size. But the wall gets thicker with schedule 80. This makes the inside space smaller and the pipe stronger.

Key Features

Schedule 80 pipes have many good points. These features make them great for tough jobs.

• Thicker Walls: The wall is much thicker than schedule 40. This makes the pipe stronger and helps it last longer.
• Higher Pressure Resistance: Schedule 80 can take more pressure. This is good for factories where safety is important.
• Same Outer Diameter: The outside diameter does not change between schedule 40 and schedule 80. Only the wall and inside space change.
• Smaller Internal Diameter: The thicker wall means less space inside the pipe. This can change how much flows through, so plan for it.
• Standardized by Industry: Big groups agree on what schedule 80 means. Pipes with this label meet strict rules.

Here is a table that compares schedule 80 and schedule 40 pipes:

Feature	Schedule 80 Pipe	Schedule 40 Pipe
Wall Thickness	Thicker wall for greater strength	Thinner wall
Pressure Resistance	Higher pressure resistance	Lower pressure resistance
Internal Diameter	Smaller internal diameter	Larger internal diameter

Tip: Always check what pressure and temperature your system needs. Schedule 80 is best when you need more strength and safety.

You will find schedule 80 pipes in chemical plants and water treatment places. They are also used where pipes must be very strong. The thick wall and high pressure rating make schedule 80 special.

Schedule 80 Pipe Dimensions

Understanding schedule 80 pipe dimensions helps you select the right pipe for your project. You need to know the outside diameter, wall thickness, and internal diameter. These measurements affect how much pressure the pipe can handle and how much fluid can flow through it. Industry standards like ASTM and ASME set the rules for these dimensions. You can find these details in a pipe dimensions chart or by checking the specifications for schedule 80.

Outside Diameter and Wall Thickness

You measure the outside diameter from one edge of the pipe to the other, across the center. The wall thickness tells you how strong the pipe is. Schedule 80 has thicker walls than other schedules. This makes it better for high-pressure jobs. The outside diameter stays the same for each nominal size, but the wall thickness increases with schedule 80.

Here is a pipe dimensions chart for common schedule 80 sizes:

Nominal Size (inches)	Outside Diameter (inches)	Wall Thickness (inches)
1/2	0.840	0.147
3/4	1.050	0.154
1	1.315	0.179
1-1/4	1.660	0.191
1-1/2	1.900	0.200
2	2.375	0.218
2-1/2	2.875	0.276
3	3.500	0.300
4	4.500	0.337
6	6.625	0.432
8	8.625	0.500
10	10.750	0.594
12	12.750	0.688
14	14.000	0.750
16	16.000	0.844
18	18.000	0.938
20	20.000	1.031
24	24.000	1.219

You can see how the wall thickness increases as the nominal size gets larger. This makes schedule 80 pipe strong and reliable for tough jobs.

Note: Standards like ASTM A53, ASTM A106, and ASME B36.10M specify these dimensions. Always check the latest standards before you order or install schedule 80 pipe.

Internal Diameter

The internal diameter tells you how much space is inside the pipe. You calculate it by subtracting twice the wall thickness from the outside diameter. This measurement affects how much water, gas, or other material can flow through the pipe. Thicker walls mean a smaller internal diameter.

Here is a simple formula you can use:

Internal Diameter = Outside Diameter - (2 × Wall Thickness)

For example, a 4-inch schedule 80 pipe has an outside diameter of 4.500 inches and a wall thickness of 0.337 inches. The internal diameter is:

4.500 - (2 × 0.337) = 3.826 inches

Here is a pipe dimensions chart showing outside diameter, wall thickness, and internal diameter for schedule 80:

Nominal Pipe Size (inches)	Outside Diameter (inches)	Wall Thickness (inches)	Internal Diameter (inches)
4	4.500	0.337	3.826
6	6.625	0.432	5.761
8	8.625	0.500	7.625
10	10.750	0.594	9.562
12	12.750	0.688	11.374
16	16.000	0.844	14.312
20	20.000	1.031	17.938
24	24.000	1.219	21.562

You need to check the internal diameter when you plan your system. Smaller internal diameter means less flow. Always use a pipe dimensions chart to compare sizes and make sure you pick the right schedule 80 pipe dimensions for your needs.

Tip: Use conversion factors to switch between inches and millimeters if your project requires metric units. For example, 1 inch equals 25.4 millimeters.

You can rely on schedule 80 pipe for high-pressure and high-strength applications. Knowing the dimensions helps you avoid mistakes and ensures your system works safely.

Schedule 80 Steel Pipe Materials

Material Types

When you pick schedule 80 steel pipe, you should know what materials are available. The best choice depends on your job, where the pipe will be used, and how much pressure it needs to handle. Schedule 80 steel pipe material types give you choices for strength, fighting rust, and lasting a long time. You will see schedule 80 steel pipe made from different materials for factories and businesses.

Here are the main schedule 80 steel pipe material types you might find:

• Stainless Steel Pipe
• Nickel Alloy Pipe
• Hastelloy Tube
• Inconel Pipe
• Carbon Steel Pipe
• Alloy Steel Pipe
• Copper Nickel Pipe
• Mild Steel Pipe
• Galvanized Steel Pipe

Each material has its own good points. Stainless steel does not rust and works in tough places. Carbon steel is strong and saves money. Nickel alloys and Hastelloy can handle very hot and harsh chemicals. Galvanized steel pipe does not rust, so it is good for water pipes. You should pick the schedule 80 steel pipe material types that fit your project for the best results.

Tip: Always check if the pipe can handle the chemicals and pressure before you choose a schedule 80 steel pipe material type.

Grades and Standards

You also need to think about grades and standards when picking schedule 80 steel pipe. These rules help you compare pipes and keep things safe. The most common standards for schedule 80 steel pipe are ASTM and API. Each standard has rules for how strong the pipe is, how it is made, and how it is tested.

Here is a table showing some grades and standards for schedule 80 steel pipe:

Standard	Grade	Minimum Tensile Strength
ASTM A53	Welded	48,000 psi
ASTM A106	Seamless	60,000 psi
API 5L	Varies	Based on specific grade

You will see these grades on the pipe’s label. ASTM A53 is for welded schedule 80 steel pipe. ASTM A106 is for seamless pipe. API 5L is used for oil and gas pipes. Always check the grade and standard to make sure the schedule 80 steel pipe is right for your project.

Note: The right grade helps your pipe stay safe when the pressure or temperature changes. Always check the standard before you buy.

Pressure Ratings

By Material and Size

It is important to know the pressure ratings before picking schedule 80 steel pipe. These ratings show how much psi the pipe can safely hold. The pipe’s material, wall thickness, and size all affect this number. Schedule 80 steel pipe is strong. It works well for high water pressure and hard jobs.

Here is a table with the highest pressure each pipe size can take:

PIPE SIZE	MAX. W. P. PSI
1/4″	1130
3/8″	920
1/2″	850
3/4″	690
1″	630
1-1/4″	520
1-1/2″	470
2″	400
2-1/2″	420
3″	370
4″	320
5″	290
6″	280
8″	250
10″	230
12″	230

You can see that bigger pipes have lower psi ratings. For example, a 1-inch pipe can take up to 630 psi. A 6-inch pipe can only take 280 psi. This happens because bigger pipes have more area for pressure to push on.

If you use schedule 80 pipe made from plastic, the pressure rating is lower. For example, a 1-inch plastic pipe may only take 378 psi. Always check the pipe’s size and material before you choose.

Note: Use the right schedule 80 steel pipe for high-pressure or high-temperature jobs. This keeps your system safe and working well.

Temperature Considerations

When the temperature goes up, the pipe gets weaker. This means the pipe can hold less pressure. You need to use a derating factor to lower the pressure rating for hot jobs.

For schedule 80 plastic pipes, use this table to find the derating factor:

OPERATING TEMPERATURE (°F)	DE-RATING FACTOR
73	1.00
80	0.88
90	0.75
100	0.62
110	0.51
120	0.40
130	0.31
140	0.22

To get the new pressure rating, multiply the old psi by the derating factor. For example, if your pipe is rated at 400 psi at 73°F, and you use it at 110°F, the new rating is 400 × 0.51 = 204 psi.

Tip: Always check the temperature and use the right derating factor. This helps stop pipe problems and keeps your system safe.

You can count on schedule 80 steel pipe for high water pressure and heat if you follow these steps. Knowing about pressure ratings and temperature helps you pick the best pipe for your job.

Schedule 80 Applications

Industrial Uses

Schedule 80 steel pipe is used where safety is very important. Its thick walls help it work well in high-pressure places. You use schedule 80 when you need to move liquids or gases at higher pressure than schedule 40 can handle. Many factories and plants trust schedule 80 for important jobs.

Here are some common ways people use schedule 80:

• Chemical processing plants use schedule 80 steel pipe to move harsh fluids.
• Industrial water systems pick schedule 80 for pipes that carry water under high pressure.
• Small hydraulic systems use schedule 80 to work safely with strong pressure.
• Oil and gas pipelines need schedule 80 steel pipe to protect against damage and rust.
• Schedule 80 is used where pipes might get hit or worn down because its walls are thicker.

Tip: Pick schedule 80 if your system has high pressure or could get damaged or rusty.

The table below lists some uses and why schedule 80 is a good choice:

Application	Reason for Choosing Schedule 80
Chemical Processing	Handles harsh fluids, high pressure
Industrial Water Systems	Good for high-pressure jobs
Oil and Gas Pipelines	Gives strong protection
Hydraulic Systems	Keeps things safe under high pressure

When Not to Use

Do not use schedule 80 if you do not need its extra strength. The thick walls make the inside smaller, so less can flow through. You may not need schedule 80 for jobs with low pressure or if you care more about weight and cost than strength.

Think about these things before picking schedule 80:

• Low-pressure jobs do not need thick walls.
• If you want the most flow, schedule 40 is better because it has a bigger inside.
• If you want light pipes or need to save money, schedule 80 may cost too much.
• Most home plumbing does not need schedule 80.

Note: Always choose the pipe that fits your system’s pressure and flow. Using schedule 80 when you do not need it can waste money and make things work less well.

Comparison with Other Schedules

Schedule 80 vs Schedule 40

When you look at schedule 80 and schedule 40 pipes, you see some big differences. Schedule 80 has a thicker wall than schedule 40. This thicker wall lets it handle more pressure. Schedule 80 is used for tough jobs. Schedule 40 is good for regular jobs. The table below shows how they are different:

Property	Schedule 40 Pipe	Schedule 80 Pipe
Wall Thickness	Thinner wall	Thicker wall
Pressure Rating	Lower pressure rating	Higher pressure rating
Applications	Standard applications	Heavy-duty applications

Schedule 80 costs more because it uses more material. Schedule 40 is cheaper and easier to put in. If you need a pipe for your house or garden, schedule 40 is usually fine. Schedule 80 is better for places like chemical plants or where there is high pressure.

Here are some things about cost you should know:

• SCH 80 pipes cost more than SCH 40 pipes because of the thicker walls.
• More material makes schedule 80 pipes more expensive.
• Schedule 40 pipes are cheaper than schedule 80 pipes.
• Schedule 80 pipes need extra materials and steps to make, so they cost more.
• Schedule 80 PVC costs more because its walls are thicker.
• The higher price is worth it if you need stronger pipes.
• Schedule 40 is usually the best choice if you want to save money.

Tip: Always pick the pipe that matches your system’s pressure and safety needs. You can save money and avoid trouble by choosing the right pipe.

Trade-Offs

You have to think about some trade-offs when picking between schedule 80 and other schedules. Schedule 80 is stronger and safer, but it costs more and is heavier. Schedule 40 is lighter and easier to use, but it cannot take as much pressure. The table below shows the main trade-offs:

Feature	Schedule 40	Schedule 80
Wall Thickness	Thinner wall, more workable	Thicker wall, higher pressure strength
Pressure Tolerance	Best for home and light commercial	Ideal for high-stress uses
Weight and Handling	Lighter, easier to ship and install	Heavier, requires additional support
Cost	More cost-effective for everyday use	More costly, but necessary for safety
Applications	Home plumbing, irrigation, ventilation	Chemical processing, industrial systems

Think about how hard it is to install, how heavy the pipe is, and how much money you have before you choose. Schedule 80 is best for hard jobs. Schedule 40 works for most normal jobs. This comparison helps you pick the right pipe for what you need.

Selection and Specification

Checklist

Having a checklist helps you pick the right schedule 80 for your job. It keeps you from making mistakes and helps your system stay safe. Follow these steps to make a good choice:

1. Identify Pressure and Temperature Needs
   First, find out the highest pressure and temperature your system will have. This is very important when picking schedule 80 steel pipe.
2. Assess the Application Environment
   Look at where you will put the pipe. Check if there are heavy loads, chemicals, or things that can cause rust. These things help you know if schedule 80 is the right choice.
3. Analyze Fluid Characteristics
   Think about what will go through the pipe. If the fluid is rough or can cause rust, you might need thicker walls or special pipe materials.
4. Review Pipe Size and Flow Requirements
   Make sure the inside of schedule 80 is big enough for what you need. Thicker walls mean less room inside for things to flow.
5. Check Standards and Certifications
   Make sure your schedule 80 steel pipe meets rules like ASTM or ASME for your work.
6. Consider Service Life and Maintenance
   Think about how long you want the pipe to last. Plan to check and clean it often, especially if it will be under high pressure.

Tip: Always match the pipe’s pressure rating and material to your job. This helps stop problems and keeps your system safe.

Best Practices

You can make schedule 80 last longer and keep things safe by following these tips:

• Inspect and Clean Regularly
  Look at pipes for damage or color changes. Clean the fittings so nothing blocks the flow.
• Install Properly
  Follow the maker’s instructions. Try not to bend the pipe too much or let it leak.
• Stay Within Limits
  Use schedule 80 steel pipe only in the right pressure and temperature range. This keeps the pipe from breaking.
• Protect from Environment
  Keep pipes out of the sun and away from bad weather. This is important if the pipe is outside.
• Replace Worn Parts
  Watch how much you use the pipe and change old parts before they break.
• Work with Reliable Suppliers
  Buy from suppliers who sell good pipes and help you if you need it.

When you choose schedule 80, always think about pressure, temperature, and where the pipe will go. These things help the pipe work well and last a long time in tough jobs.

You get strong and steady results when you pick schedule 80 for tough places. The thick walls and high pressure ratings help in important jobs like chemical plants and hydraulic systems. Good records are needed for safety and to work well. Check what your project needs, how much it costs, how long it will last, and how to take care of it. Use the tables and checklists in this guide to help you choose. For more information, look at these resources:

Resource	Description
Schedule 80 Steel Pipe Sizes and Dimensions ANSI	Size data for American National Standard Schedule 80 Welded and Seamless Steel Pipe.

FAQ

What does “schedule” mean for pipes?

“Schedule” tells you how thick the pipe walls are. A higher schedule means the pipe wall is thicker. Schedule 80 pipes have thicker walls than schedule 40 pipes. Thicker walls help the pipe hold more pressure.

Can you use schedule 80 pipe for drinking water?

You can use schedule 80 pipe for drinking water if it is safe. Always look for NSF certification on the pipe. Make sure the pipe material is safe for drinking water.

How do you measure schedule 80 pipe size?

Pipe size is measured by its nominal diameter, not the real outside diameter. Use a tape measure to find the outside diameter. Then check a schedule 80 chart for wall thickness and inside diameter.

Is schedule 80 pipe suitable for outdoor use?

You can use schedule 80 pipe outside if you choose the right material. Stainless steel and galvanized steel do not rust easily. If you use plastic pipe, keep it out of the sun to stop damage.