Stainless steel pipe is one of the more standardized materials in the building and engineering industries.
The thickness of the pipe walls, diameter of the pipe and even the chemical composition are all written as part of the American National Standards Institute standards, which is just one of multiple standards available.
Wall Thickness
Stainless steel pipe categorized by the American National Standards Institute uses the term schedule in reference to the pipe's wall thickness. Despite this standardization, the wall thickness is not the same for every diameter of pipe. Instead, the schedule refers to the general strength of the pipe. Therefore, a schedule 40S stainless pipe has a wall thickness of approximately 1.73mm for a pipe with outside diameter of 10.3mm but increases to 9.53mm for a pipe of the same schedule but 323.9mm in diameter. There are four general schedules for stainless pipe; 5S, 10S, 40S and 80S.
Materials
Though ANSI standardizes stainless steel pipe, there are multiple formulas of stainless steel available. The two primary steels used in the manufacture of stainless steel pipe are ANSI 304 stainless steel and ANSI 316. Both steels have similar chemistry and differ only slightly in the amount of chromium in the steel.
Stainless Steel Pipe Chart
American National Standards Institute - ANSI
| NPS | OD | Schedule Designations | Wall Thickness | Inside Diameter | Weight |
|---|---|---|---|---|---|
| (Inches) | (ANSI/ASME) | (Inches) | (Inches) | (lbs./ft.) | |
| 1/8 | 0.405 | 10/10S | 0.049 | 0.307 | 0.1863 |
| Std./40/40S | 0.068 | 0.269 | 0.2447 | ||
| XS/80/80S | 0.095 | 0.215 | 0.3145 | ||
| 1/4 | 0.54 | 10/10S | 0.065 | 0.41 | 0.3297 |
| Std./40/40S | 0.088 | 0.364 | 0.4248 | ||
| XS/80/80S | 0.119 | 0.302 | 0.5351 | ||
| 3/8 | 0.675 | 10/10S | 0.065 | 0.545 | 0.4235 |
| Std./40/40S | 0.091 | 0.493 | 0.5676 | ||
| XS/80/80S | 0.126 | 0.423 | 0.7388 | ||
| 1/2 | 0.84 | 5/5S | 0.065 | 0.71 | 0.5383 |
| 10/10S | 0.083 | 0.674 | 0.671 | ||
| Std./40/40S | 0.119 | 0.622 | 0.851 | ||
| XS/80/80S | 0.147 | 0.546 | 1.088 | ||
| 160 | 0.188 | 0.466 | 1.309 | ||
| XX | 0.294 | 0.252 | 1.714 | ||
| 3/4 | 1.05 | 5/5S | 0.065 | 0.92 | 0.6838 |
| 10/10S | 0.083 | 0.884 | 0.8572 | ||
| Std./40/40S | 0.113 | 0.824 | 1.131 | ||
| XS/80/80S | 0.154 | 0.742 | 1.474 | ||
| 160 | 0.219 | 0.618 | 1.944 | ||
| XX | 0.308 | 0.434 | 2.441 | ||
| 1 | 1.315 | 5/5S | 0.065 | 1.185 | 0.8678 |
| 10/10S | 0.109 | 1.097 | 1.404 | ||
| Std./40/40S | 0.133 | 1.049 | 1.679 | ||
| XS/80/80S | 0.179 | 0.957 | 2.172 | ||
| 160 | 0.25 | 0.815 | 2.844 | ||
| XX | 0.358 | 0.599 | 3.659 | ||
| 1 1/4 | 1.66 | 5/5S | 0.065 | 1.53 | 1.107 |
| 10/10S | 0.109 | 1.442 | 1.806 | ||
| Std./40/40S | 0.14 | 1.38 | 2.273 | ||
| XS/80/80S | 0.191 | 1.278 | 2.997 | ||
| 160 | 0.25 | 1.16 | 3.765 | ||
| XX | 0.382 | 0.896 | 5.214 | ||
| 1 1/2 | 1.9 | 5/5S | 0.065 | 1.77 | 1.274 |
| 10/10S | 0.109 | 1.682 | 2.085 | ||
| Std./40/40S | 0.145 | 1.61 | 2.718 | ||
| XS/80/80S | 0.2 | 1.5 | 3.631 | ||
| 160 | 0.281 | 1.338 | 4.859 | ||
| XX | 0.4 | 1.1 | 6.408 | ||
| 2 | 2.375 | 5/5S | 0.065 | 2.245 | 1.604 |
| 10/10S | 0.109 | 2.157 | 2.638 | ||
| Std./40/40S | 0.154 | 2.067 | 3.653 | ||
| XS/80/80S | 0.218 | 1.939 | 5.022 | ||
| 160 | 0.344 | 1.689 | 7.462 | ||
| XX | 0.436 | 1.503 | 9.029 | ||
| 2 1/2 | 2.875 | 5/5S | 0.083 | 2.709 | 2.475 |
| 10/10S | 0.12 | 2.635 | 3.531 | ||
| Std./40/40S | 0.203 | 2.469 | 5.793 | ||
| XS/80/80S | 0.276 | 2.323 | 7.661 | ||
| 160 | 0.375 | 2.125 | 10.01 | ||
| XX | 0.552 | 1.771 | 13.69 | ||
| 3 | 3.5 | 5/5S | 0.083 | 3.334 | 3.029 |
| 10/10S | 0.12 | 3.26 | 4.332 | ||
| Std./40/40S | 0.216 | 3.068 | 7.576 | ||
| XS/80/80S | 0.3 | 2.9 | 10.25 | ||
| 160 | 0.438 | 2.624 | 14.32 | ||
| XX | 0.6 | 2.3 | 18.58 | ||
| 3 1/2 | 4 | 5/5S | 0.083 | 3.834 | 3.472 |
| 10/10S | 0.12 | 3.76 | 4.973 | ||
| Std./40/40S | 0.226 | 3.548 | 9.109 | ||
| XS/80/80S | 0.318 | 3.364 | 12.5 | ||
| XX | 0.636 | 2.728 | 22.85 | ||
| 4 | 4.5 | 5/5S | 0.083 | 4.334 | 3.915 |
| 10/10S | 0.12 | 4.26 | 5.613 | ||
| Std./40/40S | 0.237 | 4.026 | 10.79 | ||
| XS/80/80S | 0.337 | 3.826 | 14.98 | ||
| 120 | 0.438 | 3.624 | 19 | ||
| 160 | 0.531 | 3.438 | 22.51 | ||
| XX | 0.674 | 3.152 | 27.54 | ||
| 4 1/2 | 5 | Std./40/40S | 0.247 | 4.506 | 12.53 |
| XS/80/80S | 0.355 | 4.29 | 17.61 | ||
| XX | 0.71 | 3.58 | 32.43 | ||
| 5 | 5.563 | 5/5S | 0.109 | 5.345 | 6.349 |
| 10/10S | 0.134 | 5.295 | 7.77 | ||
| Std./40/40S | 0.258 | 5.047 | 14.62 | ||
| XS/80/80S | 0.375 | 4.813 | 20.78 | ||
| 120 | 0.5 | 4.563 | 27.04 | ||
| 160 | 0.625 | 4.313 | 32.96 | ||
| XX | 0.75 | 4.063 | 38.55 | ||
| 6 | 6.625 | 5/5S | 0.109 | 6.407 | 7.585 |
| 10/10S | 0.134 | 6.357 | 9.289 | ||
| Std./40/40S | 0.28 | 6.065 | 18.97 | ||
| XS/80/80S | 0.432 | 5.761 | 28.57 | ||
| 120 | 0.562 | 5.491 | 36.39 | ||
| 160 | 0.719 | 5.189 | 45.35 | ||
| XX | 0.864 | 4.897 | 53.16 | ||
| 7 | 7.625 | Std./40/40S | 0.301 | 7.023 | 23.57 |
| XS/80/80S | 0.5 | 6.625 | 38.05 | ||
| XX | 0.875 | 5.875 | 63.08 | ||
| 8 | 8.625 | 5S | 0.109 | 8.407 | 9.914 |
| 10/10S | 0.148 | 8.329 | 13.4 | ||
| 20 | 0.25 | 8.125 | 22.36 | ||
| 30 | 0.277 | 8.071 | 24.7 | ||
| Std./40/40S | 0.322 | 7.981 | 28.55 | ||
| 60 | 0.406 | 7.813 | 35.64 | ||
| XS/80/80S | 0.5 | 7.625 | 43.39 | ||
| 100 | 0.594 | 7.439 | 50.95 | ||
| 120 | 0.719 | 7.189 | 60.71 | ||
| 140 | 0.812 | 7.001 | 67.76 | ||
| XX | 0.875 | 6.875 | 72.42 | ||
| 160 | 0.906 | 6.813 | 74.69 | ||
| 9 | 9.625 | Std./40/40S | 0.342 | 8.941 | 33.9 |
| XS/80/80S | 0.5 | 8.625 | 48.72 | ||
| XX | 0.875 | 7.875 | 81.77 | ||
| 10 | 10.75 | 5S | 0.134 | 10.482 | 15.19 |
| 10S | 0.165 | 10.42 | 18.7 | ||
| 20 | 0.25 | 10.25 | 28.04 | ||
| 30 | 0.307 | 10.136 | 34.24 | ||
| Std./40/40S | 0.365 | 10.02 | 40.48 | ||
| XS/60/80S | 0.5 | 9.75 | 54.74 | ||
| 80 | 0.594 | 9.564 | 64.43 | ||
| 100 | 0.719 | 9.314 | 77.03 | ||
| 120 | 0.844 | 9.064 | 89.29 | ||
| 140 | 1 | 8.75 | 104.13 | ||
| 160 | 1.125 | 8.5 | 115.64 | ||
| 11 | 11.75 | Std./40/40S | 0.375 | 11 | 45.55 |
| XS/80/80S | 0.5 | 10.75 | 60.07 | ||
| XX | 0.875 | 10 | 101.63 | ||
| 12 | 12.75 | 5S | 0.165 | 12.42 | 22.18 |
| 10S | 0.18 | 12.39 | 24.2 | ||
| 20 | 0.25 | 12.25 | 33.38 | ||
| 30 | 0.33 | 12.09 | 43.77 | ||
| Std./40S | 0.375 | 12 | 49.56 | ||
| 40 | 0.406 | 11.938 | 53.53 | ||
| XS/80S | 0.5 | 11.75 | 65.42 | ||
| 12 | 12.75 | 60 | 0.562 | 11.626 | 73.15 |
| 80 | 0.688 | 11.376 | 88.63 | ||
| 100 | 0.844 | 11.064 | 107.32 | ||
| 120 | 1 | 10.75 | 125.49 | ||
| 140 | 1.125 | 10.5 | 139.67 | ||
| 160 | 1.312 | 10.126 | 160.27 | ||
| 14 | 14 | 10S | 0.188 | 13.624 | 27.73 |
| 10 | 0.25 | 13.5 | 36.71 | ||
| 20 | 0.312 | 13.376 | 45.61 | ||
| Std./30/40S | 0.375 | 13.25 | 54.57 | ||
| 40 | 0.438 | 13.124 | 63.44 | ||
| XS/80S | 0.5 | 13 | 72.09 | ||
| 60 | 0.594 | 12.814 | 85.05 | ||
| 80 | 0.75 | 12.15 | 106.13 | ||
| 100 | 0.938 | 12.126 | 130.85 | ||
| 120 | 1.094 | 11.814 | 150.9 | ||
| 140 | 1.25 | 11.5 | 170.21 | ||
| 160 | 1.406 | 11.188 | 189.1 | ||
| 16 | 16 | 10S | 0.188 | 15.624 | 31.75 |
| 10 | 0.25 | 15.5 | 42.05 | ||
| 20 | 0.312 | 15.376 | 52.27 | ||
| Std./30/40S | 0.375 | 15.25 | 62.58 | ||
| XS/40/80S | 0.5 | 15 | 82.77 | ||
| 60 | 0.656 | 14.688 | 107.5 | ||
| 80 | 0.844 | 14.314 | 136.61 | ||
| 100 | 1.031 | 13.938 | 164.82 | ||
| 120 | 1.219 | 13.564 | 192.43 | ||
| 140 | 1.438 | 13.124 | 223.64 | ||
| 160 | 1.594 | 12.814 | 245.25 | ||
| 18 | 18 | 10S | 0.188 | 17.624 | 35.76 |
| 10 | 0.25 | 17.5 | 47.39 | ||
| 20 | 0.312 | 17.376 | 58.94 | ||
| Std./40S | 0.375 | 17.25 | 70.59 | ||
| 30 | 0.438 | 17.124 | 82.15 | ||
| XS/80S | 0.5 | 17 | 93.45 | ||
| 40 | 0.562 | 16.876 | 104.67 | ||
| 60 | 0.75 | 16.5 | 138.17 | ||
| 80 | 0.938 | 16.126 | 170.92 | ||
| 100 | 1.156 | 15.688 | 207.96 | ||
| 120 | 1.375 | 15.25 | 244.14 | ||
| 140 | 1.562 | 14.876 | 274.22 | ||
| 160 | 1.781 | 14.438 | 308.5 | ||
| 20 | 20 | 10 | 0.25 | 19.5 | 52.73 |
| 20 | 0.375 | 19.25 | 78.6 | ||
| 30 | 0.5 | 19 | 104.13 | ||
| 40 | 5.94 | 18.814 | 123.11 | ||
| 60 | 8.12 | 18.376 | 166.4 | ||
| 80 | 1.031 | 17.938 | 208.87 | ||
| 100 | 1.281 | 17.438 | 256.1 | ||
| 120 | 1.5 | 17 | 296.37 | ||
| 140 | 1.75 | 16.5 | 341.09 | ||
| 160 | 1.969 | 16.064 | 379.17 |
| NPS | OD | Schedule Designations | Wall Thickness | Inside Diameter | Weight |
|---|---|---|---|---|---|
| (Inches) | (ANSI/ASME) | (Inches) | (Inches) | (lbs./ft.) | |
| 22 | 22 | 10/10S | 0.25 | 21.5 | 58.07 |
| Std./20/40S | 0.375 | 21.25 | 86.61 | ||
| XS/30/80S | 0.5 | 21 | 114.81 | ||
| 60 | 0.875 | 20.25 | 197.41 | ||
| 80 | 1.125 | 19.75 | 250.81 | ||
| 100 | 1.375 | 19.25 | 302.88 | ||
| 120 | 1.625 | 18.75 | 353.61 | ||
| 140 | 1.875 | 18.25 | 403 | ||
| 160 | 2.125 | 17.75 | 451.06 | ||
| 24 | 24 | 10/10S | 0.25 | 23.5 | 63.41 |
| Std./20/40S | 0.375 | 23.25 | 94.62 | ||
| XS/80S | 0.5 | 23 | 125.49 | ||
| 30 | 0.562 | 22.876 | 140.68 | ||
| 40 | 0.688 | 22.626 | 171.29 | ||
| 60 | 0.969 | 22.064 | 238.35 | ||
| 80 | 1.219 | 21.564 | 296.58 | ||
| 100 | 1.531 | 20.938 | 367.39 | ||
| 120 | 1.812 | 20.376 | 429.39 | ||
| 140 | 2.062 | 19.876 | 483.1 | ||
| 160 | 2.344 | 19.314 | 542.13 | ||
| 26 | 26 | 10 | 0.312 | 25.376 | 85.6 |
| Std./40S | 0.375 | 25.25 | 102.63 | ||
| XS/80S | 0.5 | 25 | 136.17 | ||
| 28 | 28 | 10 | 0.312 | 27.376 | 92.26 |
| Std./40S | 0.375 | 27.25 | 110.64 | ||
| 20/80S | 0.5 | 27 | 146.25 | ||
| 30 | 0.625 | 26.75 | 182.73 | ||
| 30 | 30 | 10 | 0.312 | 29.376 | 98.93 |
| Std./40S | 0.375 | 29.25 | 118.65 | ||
| XS/20/80S | 0.5 | 29 | 157.53 | ||
| 30 | 0.625 | 28.75 | 196.08 | ||
| 32 | 32 | 10 | 0.312 | 31.376 | 105.59 |
| Std. | 0.375 | 31.25 | 126.66 | ||
| 20 | 0.5 | 31 | 168.21 | ||
| 30 | 0.625 | 30.75 | 109.43 | ||
| 40 | 0.688 | 30.624 | 230.08 | ||
| 34 | 34 | 10 | 0.312 | 33.376 | 112.25 |
| Std. | 0.375 | 33.25 | 134.67 | ||
| 20 | 0.5 | 33 | 178.89 | ||
| 30 | 0.625 | 32.75 | 222.78 | ||
| 40 | 0.688 | 32.624 | 244.77 | ||
| 36 | 36 | 10 | 0.312 | 35.375 | 118.92 |
| Std./40S | 0.375 | 35.25 | 142.68 | ||
| XS/80S | 0.5 | 35 | 189.57 | ||
| 42 | 42 | Std./40S | 0.375 | 41.25 | 166.71 |
| XS/80S | 0.5 | 41 | 221.61 | ||
| 30 | 0.625 | 40.75 | 276.18 | ||
| 40 | 0.75 | 40.5 | 330.41 | ||
| 48 | 48 | Std./40S | 0.375 | 47.25 | 190.74 |
| XS/80S | 0.5 | 47 |
Diameter
Within each schedule of pipe there are multiple diameters of stainless steel pipe standardized by ANSI. These diameters range from 10.3mm (or .405 inches) to 323.9mm (or 12.75 inches). It is important to note that some diameters are not available in every schedule. For instance, the smallest diameters are not available in schedule 5S and many diameters are very difficult to find in some schedules, or very expensive if they are available.
FAQs
Is standard for stainless steel pipe? ›
ASTM A790/ ASME SA790 is standard specification for seamless and welded ferritic/austenitic stainless steel pipe.
What is ASTM for stainless steel pipe? ›ASTM A312 pipe is the general use stainless steel pipe applied in different industries. It covers diameters from 1/8” to 30” and thickness from SCH 10S to SCH 80S. Common use material grades are TP304/304L, TP316/316L.
What is the tolerance for pipes? ›| Schedule Number | Tolerance |
|---|---|
| Allowable deviation of wall thickness at any point from nominal wall thickness | |
| 5 and 10 | ±12-1/2%, ±0.12 in. min. |
| 20 and greater | -12-1/2%2 |
Stainless steel pipes are manufactured according to ASTM A312 standard. The material is available in grade SS316/316L and made in standard length of 6 meters long.
What is stainless steel pipe schedule? ›Pipe Schedule (SCH) is a standard that measures the nominal wall thickness of a pipe, given by the ANSI / ASME B36. 10M standard for Stainless Steel Pipe dimensions, and API 5L standard for seamless and welded steel pipes.
Is code for steel pipes? ›ISO/R 336 : 1976 Plain end steel tubes, welded or seamless; general table of dimensions and masses per unit length.
What is the ASTM for 304 stainless steel? ›304 and 304L ASTM A240 stainless steel plate is a standard 18-8 material – meaning it contains 18% chromium and 8% nickel. 304 Stainless steel plate is one of the most versatile stainless steel materials available. It has excellent forming and welding characteristics.
What is the ASTM code for pipe? ›ASTM A234 is Standard Specification for steel pipe fittings includes carbon and alloy steel material for moderate and high temperature services. It covers steel fittings of seamless and welded types. Steel Pipe fittings are applied in pressure pipelines and in pressure vessel fabrications.
What does ASTM stand for on pipe? ›Americal Society for Testing and Materials (ASTM) has researched and defined various material standards for oil and gas industry. Properties of these materials depend on chemical properties of fluids to be handled, design temperatures and pressure as well of method of manufacture of pipe fittings.
What are the dimension standards for carbon steel pipes and stainless steel pipes? ›10M : Dimensional Standard for Carbon Steel Pipes. Available Size range of pipes is from 1/8″ to 80″ NPD. The manufacture of pipe NPS 1/8″ to NPS 12″ inclusive is based on standardized outside diameter (OD). The manufacture of pipe NPS 14 and larger is based on OD corresponding to nominal size.
How do I calculate pipe thickness? ›
Answer: Having the inside dimensions (ID) and the outside dimensions (OD) will allow you to figure out the wall thickness on tubing. You would need to subtract the ID from the OD and then divide by two. This number is the wall thickness.
What size is schedule 40 pipe? ›Schedule 40 Steel Pipe Dimensions
A more common pipe is the 4-inch schedule 40 steel pipe. This pipe's outside diameter is 4.5 with a wall thickness of 0.237 and a weight per foot of 10.79.
The most common standard diameters are as follow: 0.5 inch (15 mm), 0.75 inch (20 mm), 1 inch (25 mm), 1.5 inch (40 mm), 2 inch (50 mm), 3 inch (80 mm), 4 inch (100 mm), 6 inch (150 mm), 8 inch (200 mm), 10 inch (250 mm), 12 inch (300 mm), 14 inch (350 mm), 16 inch (400 mm), 18 inch (450 mm), 20 inch (500 mm), 22 inch ...
What is the OD of stainless steel pipe? ›Fractional/Metric/Square
Metric stainless steel tubing is used for high-pressure hydraulic and pneumatic applications, with sizes ranging from 1 mm OD / . 254 mm Wall (. 040” OD / . 010”) to 26 mm OD / 1.32 mm Wall (1.024” OD .
Steel Pipe Dimension 3 characters
A completely description for steel pipe dimension includes outer diameter (OD), wall thickness (WT), pipe length (Normally 20 ft 6 meter, or 40 ft 12 meters).
ASTM A312. STANDARD SPECIFICATION FOR SEAMLESS, WELDED, AND HEAVILY COLD WORKED AUSTENITIC STAINLESS STEEL PIPES. 1.1 This specification covers seamless, straight-seam welded, and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service.
Is code 304 stainless steel? ›Type 304 is the most versatile and widely used stainless steel. It is still sometimes referred to by its old name 18/8 which is derived from the nominal composition of type 304 being 18% chromium and 8% nickel. Type 304 stainless steel is an austenitic grade that can be severely deep drawn.
What is ASME b36 19m? ›This Standard covers the standardization of dimensions of welded and seamless wrought stainless steel pipe for high or low temperatures and pressures. The word pipe is used, as distinguished from tube, to apply to tubular products of dimensions commonly used for pipeline and piping systems.
What is ASTM A 269? ›ASTM A269 Seamless Stainless Steel Tubing is used for low temperature and high temperature services. These pipes could be made from austenitic steel types under electric resistant weld, electric fusion weld or seamless cold drawing mechanisms. The SA269 Tubing can also have different finishes and can be heat treated.