Schedule 40 vs Schedule 80 Pipe Explained: What’s the Difference?
When purchasing steel pipe, one of the most common questions customers ask is:
“What’s the difference between Schedule 40 and Schedule 80 pipe?”
Understanding pipe schedules is important because the schedule determines the wall thickness, weight, strength, and intended applications of the pipe.
At Dominion Steel Supplies, we supply both Schedule 40 and Schedule 80 steel pipe for customers throughout Calgary and Alberta.
What Does “Schedule” Mean on Pipe?
A pipe schedule refers to the thickness of the pipe wall. As the schedule number increases, the wall thickness increases.
For example:
Schedule 40 = Standard Wall
Schedule 80 = Heavy Wall
The outside diameter remains the same, while the inside diameter becomes smaller as wall thickness increases.
For example, a 6-inch Schedule 40 pipe and a 6-inch Schedule 80 pipe have the same outside diameter, but the Schedule 80 pipe has a thicker wall and weighs more.
What Is Schedule 40 Pipe?
Schedule 40 pipe is the most common type of carbon steel pipe used in fabrication and structural applications.
Typical uses include:
Structural supports
Pipe bollards
Fencing
Handrails
Trailer fabrication
Agricultural projects
Pipe piling
General welding and fabrication
Advantages of Schedule 40 Pipe
✔ Lower cost
✔ Lighter weight
✔ Easier to handle
✔ Easier to weld
✔ Widely available
Because it offers an excellent balance of strength and cost, Schedule 40 pipe is suitable for most fabrication and structural projects.
What Is Schedule 80 Pipe?
Schedule 80 pipe has thicker walls than Schedule 40 pipe, making it stronger and heavier.
Schedule 80 pipe is commonly used for:
High-pressure systems
Heavy-duty fabrication
Hydraulic applications
Industrial processing
Mechanical systems
Wear-resistant applications
Oilfield and industrial work
Advantages of Schedule 80 Pipe
✔ Increased wall thickness
✔ Higher pressure capability
✔ Greater strength
✔ Improved wear resistance
✔ Longer service life in demanding applications
✔ More resistant to dents and abuse
Schedule 40 vs Schedule 80: Key Differences
Wall Thickness
Schedule 80 pipe has thicker walls than Schedule 40 pipe. This added thickness provides increased strength and durability.
Weight
Because it contains more steel, Schedule 80 pipe weighs more than Schedule 40 pipe.
Strength
Schedule 40 pipe is suitable for most structural and fabrication projects. Schedule 80 pipe offers even greater strength and is commonly used in demanding industrial applications.
Pressure Capability
Schedule 80 pipe can handle higher pressures because of its thicker wall.
Cost
Schedule 40 pipe is generally more economical. Schedule 80 pipe costs more because it contains more material.
Welding and Fabrication
Schedule 40 pipe is easier to handle and weld due to its lighter weight. Schedule 80 pipe may require more effort because of the increased wall thickness.
Example: 6-Inch Pipe
For a 6-inch nominal pipe:
Schedule 40
Wall thickness: 0.280”
Lighter weight
Common structural applications
Schedule 80
Wall thickness: 0.432”
Approximately 54% thicker wall
Heavier and stronger
Although both pipes have the same outside diameter, Schedule 80 pipe contains more steel and weighs significantly more.
Which Pipe Should You Choose?
Choose Schedule 40 Pipe If:
Cost is important.
Weight needs to be minimized.
The pipe is being used structurally.
It is a fabrication or welding project.
Pressure requirements are moderate.
Choose Schedule 80 Pipe If:
Additional strength is required.
Higher pressures are involved.
Wear resistance is important.
Long-term durability is a priority.
The pipe will be subjected to heavy use or abrasive conditions.
Common Steel Pipe Sizes
Dominion Steel Supplies carries a variety of steel pipe sizes, including:
2”
3”
4”
6”
8”
10”
12”
16”
20”
24”
Cut-to-length services and delivery are available throughout Calgary and Alberta.
Frequently Asked Questions
Is Schedule 80 pipe stronger than Schedule 40?
Yes. Schedule 80 pipe has thicker walls, weighs more, and offers greater strength and durability.
Is the outside diameter different?
No. Schedule 40 and Schedule 80 pipe have the same outside diameter. Only the wall thickness changes.
Is Schedule 80 pipe more expensive?
Yes. Because Schedule 80 pipe contains more steel, it costs more than Schedule 40 pipe.
Can Schedule 40 pipe be used structurally?
Absolutely. Schedule 40 pipe is widely used for structural supports, fabrication, bollards, fencing, piling, and general welding projects.
Which is better, Schedule 40 or Schedule 80?
Neither is universally better. The right choice depends on your application, pressure requirements, and budget. Schedule 40 is ideal for most structural and fabrication projects, while Schedule 80 is preferred when greater strength and durability are needed.
Need Steel Pipe in Calgary?
Dominion Steel Supplies supplies Schedule 40 and Schedule 80 steel pipe to homeowners, contractors, welders, fabricators, farms, and industrial customers throughout Calgary and Alberta.
Whether you need full lengths, cut pieces, or delivery, our team can help you find the right pipe for your project.
