Comprehensive Guide to Schedule 80 Mild Steel Pipes

Date:2024-12-20Tags:Schedule 80, Mild Steel Pipes ,Schedule 40

Steel comes in various forms depending on the additional elements added in trace amounts during its production. Among these, Schedule 80 Mild Steel Pipes stand out due to their enhanced wall thickness, strength, and versatility. These pipes are heavier and have a smaller inside diameter compared to other schedule pipes, making them ideal for high-pressure and heavy-duty applications.

What is Schedule 80 Mild Steel Pipe?

Steel pipe schedule is a notation represented by ASME B 36.10 and also used in many other standards, marked with "Sch". Sch is the abbreviation of schedule, which generally appears in the American steel pipe standard and is a prefix of a series number. For example, Sch 80, 80 is the pipe number from the chart/table ASME B 36.10. Mild steel pipe (MS pipe) is manufactured using low carbon steel (less than 0.25%). Due to the low carbon content, the steel pipe does not harden and is easy to work with. Since mild steel pipe is made of low carbon steel, it can be easily welded and formed into pipes and tubes of various shapes and sizes. These pipes are mainly used in industrial and engineering applications using corrosive fluids. In addition, MS pipes are also used in drinking water supply, i.e. plumbing, fire protection, and HVAC (heating, ventilation, and air conditioning).A Schedule 80 Mild Steel Pipe is defined by its thicker walls compared to other schedules, such as Schedule 40. This additional thickness translates to greater pressure tolerance, making it suitable for high-stress environments. The schedule 80 pipe thickness in mm varies depending on the pipe’s nominal size and outer diameter, which can be referenced in a mild steel pipe catalogue or standard charts.



Schedule 40, 80 Steel Pipe Size Means

If you are new to the pipe industry, why do you always see schedule 40 or 80 steel pipes everywhere? What materials are these pipes made of? As you have read the above article, you know that schedule 40 or 80 represents the pipe wall thickness, but why do buyers always search for it?



Here are the reasons:
Schedule 40 and 80 steel pipes are common sizes required by different industries, and they are in great demand due to the generally high pressures these pipes bear.

There is no limit to the material standards of such thickness pipes, you can ask for sch 40 stainless steel pipes, such as ASTM A312 Grade 316L; or sch 40 carbon steel pipes, such as API 5L, ASTM A53, ASTM A106B, A 179, A252, A333, etc.


Key Features of Schedule 80 Mild Steel Pipes

Thicker Walls: The increased wall thickness enhances the pipe’s pressure-handling capacity.
Smaller Internal Diameter: This results in lower flow rates but higher pressure retention.
Greater Weight: The thicker walls contribute to a higher weight per unit length.
Each of these factors varies depending on the specific size of the pipe, as determined by the Schedule 80 pipe dimensions and pressure ratings.



Schedule 80 Galvanized Mild Steel Pipes

For environments exposed to moisture or corrosive elements, galvanised mild steel pipes are commonly used. The galvanization process involves coating mild steel pipes with a protective layer of zinc to enhance their resistance to rust and corrosion. These pipes combine the strength of mild steel with the longevity provided by the zinc coating, making them ideal for plumbing, structural support, and outdoor installations.

Comparison: Schedule 40 vs. Schedule 80 Pipes

One key difference between Schedule 40 and Schedule 80 steel pipes lies in their wall thickness:
Schedule 40 pipe thickness is lighter and suited for low-pressure applications, such as water transport or general-purpose systems.
Schedule 80 pipe thickness in mm, on the other hand, is significantly greater, offering higher strength and pressure resistance.
For example, a 10-inch Schedule 80 steel pipe with a wall thickness of 15.09 mm can withstand far more pressure than its Schedule 40s pipe thickness counterpart.

Applications of Schedule 80 Mild Steel Pipes

These pipes are used in various industries, including:
Industrial Piping Systems: For conveying high-pressure gases or liquids.
Structural Frameworks: Strong enough for scaffolding and load-bearing structures.
Plumbing and Water Systems: Ensuring reliability in high-pressure water lines.
Chemical and Oil Industries: For transporting chemicals and hydrocarbons under extreme conditions.
Additionally, galvanized mild steel versions of these pipes find extensive use in fire protection systems due to their durability and rust resistance.

Importance of Sch80 Specifications and Charts

Understanding sch80 (Schedule 80 specifications) is crucial for selecting the right pipe for your project. A mild steel pipe catalogue typically provides details such as pipe dimensions, weights, and wall thicknesses. These specifications are vital for ensuring that the pipe can handle the intended pressure and environmental conditions.It simplifies the process of calculating and selecting pipes for specific applications by providing key information, such as:

Length: Helps determine the amount of material required.
Dimensions: Includes outer diameter and wall thickness for accurate pipe fitting.
Weight: Ensures compatibility with load-bearing structures or systems.
Internal Diameter (ID): Crucial for calculating flow rates of liquids or gases.

For example:
A sch80 PVC pipe might be suitable for non-metallic, corrosive environments but won’t provide the same strength as a Schedule 80 steel pipe.
Simplifying Selection with Charts
Using a sch80 pipe chart or online tools can make determining pipe dimensions, weights, and wall thicknesses much easier. These resources allow you to compare the specifications of Schedule 40, Schedule 80, and other pipe schedules effortlessly.


Schedule 80 Mild Steel Pipe Dimension


Understanding Dimensions and Pressure Ratings

The dimensions and pressure ratings for Schedule 80 pipes are calculated based on standards and formulas that consider the material’s allowable stress. For mild steel pipes, the allowable stress factor is generally set at 12,500 psi. However, the derived values serve as standard specifications and should not be assumed as guaranteed minimum values.


Nominal size [inches] Outside diameter [inches] Outside diameter [mm] Wall thickness [inches] Wall thickness [mm] Weight [lb/ft] Weight [kg/m]
1/8 inches 0.405 inches 10.3 MM 0.068 inches 1.73 MM 0.24 lb/ft 0.37 kg/m
1/4 inches 0.540 inches 13.7 MM 0.088 inches 2.24 MM 0.42 lb/ft 0.84 kg/m
1/2 inches 0.840 inches 21.3 MM 0.109 inches 2.77 MM 0.85 lb/ft 1.27 kg/m
3/4 inches 1.050 inches 26.7 MM 0.113 inches 2.87 MM 1.13 lb/ft 1.69 kg/m
1 inches 1.315 inches 33.4 MM 0.133 inches 3.38 MM 1.68 lb/ft 2.50 kg/m
1 1/4 inches 1.660 inches 42.2 MM 0.140 inches 3.56 MM 2.27 lb/ft 3.39 kg/m
1 1/2 inches 1.900 inches 48.3 MM 0.145 inches 3.68 MM 2.72 lb/ft 4.05 kg/m
2 inches 2.375 inches 60.3 MM 0.154 inches 3.91 MM 3.65 lb/ft 5.44 kg/m
2 1/2 inches 2.875 inches 73.0 MM 0.203 inches 5.16 MM 5.79 lb/ft 8.63 kg/m
3 inches 3.500 inches 88.9 MM 0.216 inches 5.49 MM 7.58 lb/ft 11.29 kg/m
3 1/2 inches 4.000 inches 101.6 MM 0.226 inches 5.74 MM 9.11 lb/ft 13.57 kg/m
4 inches 4.500 inches 114.3 MM 0.237 inches 6.02 MM 10.79 lb/ft 16.07 kg/m
5 inches 5.563 inches 141.3 MM 0.258 inches 6.55 MM 14.62 lb/ft 21.77 kg/m
6 inches 6.625 inches 168.3 MM 0.280 inches 7.11 MM 18.97 lb/ft 28.26 kg/m
8 inches 8.625 inches 219.1 MM 0.322 inches 8.18 MM 28.55 lb/ft 42.55 kg/m
10 inches 10.750 inches 273.0 MM 0.365 inches 9.27 MM 40.48 lb/ft 60.31 kg/m
12 inches 12.750 inches 323.8 MM 0.406 inches 10.31 MM 53.52 lb/ft 79.73 kg/m
14 inches 14 inches 355.6 MM 0.375 inches 11.13 MM 54.57 lb/ft 94.55 kg/m
16 inches 16 inches 406.4 MM 0.500 inches 12.70 MM 82.77 lb/ft 123.30 kg/m
18 inches 18 inches 457.0 MM 0.562 inches 14.27 MM 104.67 lb/ft 155.80 kg/m
20 inches 20 inches 508.0 MM 0.594 inches 15.09 MM 123.11 lb/ft 183.42 kg/m
24 inches 24 inches 610.0 MM 0.688 inches 17.48 MM 171.29 lb/ft 255.41 kg/m
32 inches 32 inches 813.0 MM 0.688 inches 17.48 MM 230.08 lb/ft 342.91 kg/m

Schedule 80 pipes pressure rating

Maximum Allowable Pressure (psig)
Pipe Size
(inches) 		Pipe Schedule Temperature (oF)
100 200 300 400 500 600 650 700 750
1/2 Inch 401) 3730 3730 3730 3730 3730 3730 3730 3581 3233
802) 5252 5252 5252 5252 5252 5252 5252 5042 4552
160 6920 6920 6920 6920 6920 6920 6920 6643 5997
3/4 Inch 40 2447 3059 3059 3059 3059 3059 3059 2937 2651
80 4299 4299 4299 4299 4299 4299 4299 4127 3725
160 6393 6393 6393 6393 6393 6393 6393 6137 5541
1 Inch 40 2857 2857 2857 2857 2857 2857 2857 2743 2476
80 3950 3950 3950 3950 3950 3950 3950 3792 3423
160 5757 5757 5757 5757 5757 5757 5757 5526 4989
1 1/2 Inch 40 2116 2116 2116 2116 2116 2116 2116 2032 1834
80 2983 2983 2983 2983 2983 2983 2983 2864 2585
160 4331 4331 4331 4331 4331 4331 4331 4157 3753
2 Inch 40 1783 1783 1783 1783 1783 1783 1783 1712 1545
80 2575 2575 2575 2575 2575 2575 2575 2472 2232
160 4217 4217 4217 4217 4217 4217 4217 4049 3655
3 Inch 40 1693 1693 1693 1693 1693 1693 1693 1625 1467
80 2394 2394 2394 2394 2394 2394 2394 2298 2074
160 3600 3600 3600 3600 3600 3600 3600 3456 3120
4 Inch 40 1435 1435 1435 1435 1435 1435 1435 1378 1244
80 2075 2075 2075 2075 2075 2075 2075 1992 1798
160 3376 3376 3376 3376 3376 3376 3376 3241 2926
5 Inch 40 1258 1258 1258 1258 1258 1258 1258 1208 1090
80 1857 1857 1857 1857 1857 1857 1857 1783 1610
160 3201 3201 3201 3201 3201 3201 3201 3073 2774
6 Inch 40 1143 1143 1143 1143 1143 1143 1143 1098 991
80 1794 1794 1794 1794 1794 1794 1794 1722 1554
160 3083 3083 3083 3083 3083 3083 3083 2960 2672
8 Inch 40 1006 1006 1006 1006 1006 1006 1006 966 872
80 1586 1586 1586 1586 1586 1586 1586 1523 1375
160 2976 2976 2976 2976 2976 2976 2976 2857 2579
10 Inch 40 913 913 913 913 913 913 913 876 791
80 1509 1509 1509 1509 1509 1509 1509 1448 1308
160 2950 2950 2950 2950 2950 2950 2950 2832 2557
12 Inch 40 855 855 855 855 855 855 855 819 741



Conclusion

From Schedule 80 Mild Steel Pipes to galvanised mild steel, choosing the right pipe for your project involves understanding their specifications and applications. Whether you need the enhanced pressure tolerance of Schedule 80, the corrosion resistance of galvanized options, or simply want to compare schedule 40 pipe thickness to schedule 80 pipe thickness in mm, having the right information ensures optimal performance and longevity. For high-quality steel pipe solutions, BAOWI Steel offers an extensive range of products tailored to meet your needs, ensuring superior performance and exceptional durability in every project. Always consult a mild steel pipe catalogue or professional resources to make the best decision for your needs.


Recruiting Agents, contact: info@baowi-steel.com

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