Views: 5 Author: Monica Publish Time: 2025-12-10 Origin: Site
Pipe reducers are used to connect pipes of different diameters.
ASME B16.9 standardized dimensions, tolerances, and pressure ratings for butt-weld pipe reducers, ensuring compatibility with pipes across industries such as oil and gas, chemical processing, power generation, and water treatment.
This guide summarizes the pipe reducer specifications and prices to help customers choose the right one.
Pipe reducers are fittings designed to connect pipes or tubes of differing sizes, allowing for a reduction or occasionally an increase in pipe diameter. They ensure efficient fluid flow while maintaining system integrity.
Under the ASME B16.9 standard, which governs factory-made wrought butt-welding fittings, pipe reducers are manufactured to tolerances to withstand high pressures and temperatures.
There are two primary types:
Concentric Reducers: These have a symmetrical design where the centerline of the larger and smaller ends aligns, making them ideal for vertical piping where air or gas pockets are a concern.
Eccentric Reducers: These feature an offset centerline, which is useful in horizontal lines to maintain a flat bottom or top, preventing liquid accumulation.
Both types are available in seamless or welded constructions, with nominal pipe sizes ranging from 1/2 inch to 48 inches or larger, depending on the pipe reducer manufacturer.
The ASME B16.9 standard provides detailed dimensions for butt-welded reducers, including outside diameters (OD), wall thicknesses (based on schedules like Sch 10, 40, and 80), and overall lengths.
The table below lists the dimensions of ASME B16.9 concentric and eccentric reducers for stainless steel and nickel alloy materials.
CONCENTRIC REDUCERS | ECCENTRIC REDUCER | ||||||||
Nominal Pipe (NPS) | DN | Outside | End-to-End, | Nominal Pipe (NPS) | DN | Outside | End-to-End, | ||
Large | Small | Large | Small | ||||||
3/4 x 1/2 | 20 ×15 | 26.7 | 21.3 | 38 | 5 × 4 | 125 ×100 | 141.3 | 114.3 | 127 |
3/4 x 3/8 | 20 ×10 | 26.7 | 17.3 | 38 | 5 × 3 1/2 | 125 ×90 | 141.3 | 101.6 | 127 |
1 × 3/4 | 25 ×20 | 33.4 | 26.7 | 51 | 5 × 3 | 125 ×80 | 141.3 | 88.9 | 127 |
1 × 1/2 | 25 ×15 | 33.4 | 21.3 | 51 | 5 × 2 1/2 | 125 ×65 | 141.3 | 73 | 127 |
1 1/4 × 1 | 32 ×25 | 42.2 | 33.4 | 51 | 5 × 2 | 125 × 50 | 141.3 | 60.3 | 127 |
1 1/4 ×3/4 | 32 ×20 | 42.2 | 26.7 | 51 | 6 × 5 | 150 ×125 | 168.3 | 141.3 | 140 |
1 1/4 x 1/2 | 32 ×15 | 42.2 | 21.3 | 51 | 6 × 4 | 150 ×100 | 168.3 | 114.3 | 140 |
1 1/2 x 1 1/4 | 40 ×32 | 48.3 | 42.2 | 64 | 6 × 3 1/2 | 150 ×90 | 168.3 | 101.6 | 140 |
1 1/2 × 1 | 40 ×25 | 48.3 | 33.4 | 64 | 6 × 3 | 150 ×80 | 168.3 | 88.9 | 140 |
1 1/2 x 3/4 | 40 ×20 | 48.3 | 26.7 | 64 | 6 × 2 1/2 | 150 ×65 | 168.3 | 73 | 140 |
1 1/2 x 1/2 | 40 ×15 | 48.3 | 21.3 | 64 | 8 × 6 | 200 ×150 | 219.1 | 168.3 | 152 |
2 ×1 1/2 | 50 ×40 | 60.3 | 48.3 | 76 | 8 × 5 | 200 ×125 | 219.1 | 141.3 | 152 |
2 ×1 1/4 | 50 ×32 | 60.3 | 42.2 | 76 | 8 × 4 | 200 ×100 | 219.1 | 114.3 | 152 |
2 × 1 | 50 ×25 | 60.3 | 33.4 | 76 | 8 × 3 1/2 | 200 ×90 | 219.1 | 101.6 | 152 |
2 ×3/4 | 50 ×20 | 60.3 | 26.7 | 76 | 10 × 8 | 250 ×200 | 273 | 219.1 | 178 |
2 1/2 x 2 | 65 ×50 | 73 | 60.3 | 89 | 10 × 6 | 250 ×150 | 273 | 168.3 | 178 |
2 1/2 x 1 1/2 | 65 ×40 | 73 | 48.3 | 89 | 10 × 5 | 250 x 125 | 273 | 141.3 | 178 |
2 1/2 x 1 1/4 | 65 ×32 | 73 | 42.2 | 89 | 10 × 4 | 250 ×100 | 273 | 114.3 | 178 |
2 1/2 × 1 | 65 ×25 | 73 | 33.4 | 89 | 12 × 10 | 300 ×250 | 323.8 | 273 | 203 |
3 ×2 1/2 | 80 ×65 | 88.9 | 73 | 89 | 12 × 8 | 300 ×200 | 323.8 | 219.1 | 203 |
3 × 2 | 80 ×50 | 88.9 | 60.3 | 89 | 12 × 6 | 300 ×150 | 323.8 | 168.3 | 203 |
3 × 1 1/2 | 80 ×40 | 88.9 | 48.3 | 89 | 12 × 5 | 300 ×125 | 323.8 | 141.3 | 203 |
3 × 1 1/4 | 80 ×32 | 88.9 | 42.2 | 89 | 14 × 12 | 350 ×300 | 355.6 | 323.8 | 330 |
3 1/2 × 3 | 90 ×80 | 101.6 | 88.9 | 102 | 14 × 10 | 350 ×250 | 355.6 | 273 | 330 |
3 1/2 x 2 1/2 | 90 ×65 | 101.6 | 73 | 102 | 14 × 8 | 350 ×200 | 355.6 | 219.1 | 330 |
3 1/2 × 2 | 90 ×50 | 101.6 | 60.3 | 102 | 14 × 6 | 350 ×150 | 355.6 | 168.3 | 330 |
3 1/2 × 1 1/2 | 90 ×40 | 101.6 | 48.3 | 102 | 16 × 14 | 400 ×350 | 406.4 | 355.6 | 356 |
3 1/2 x 2 1/4 | 90 ×32 | 101.6 | 42.2 | 102 | 16 × 12 | 400 ×300 | 406.4 | 323.8 | 356 |
4 × 3 1/2 | 100 ×90 | 114.3 | 101.6 | 102 | 16 × 10 | 400 ×250 | 406.4 | 273 | 356 |
4 × 3 | 100 ×80 | 114.3 | 88.9 | 102 | 16 × 8 | 400 ×200 | 406.4 | 219.1 | 356 |
4 × 2 1/2 | 100 ×65 | 114.3 | 73 | 102 | 18 × 16 | 450 ×400 | 457 | 406.4 | 381 |
4 × 2 | 100 ×50 | 114.3 | 60.3 | 102 | 18 × 14 | 450 ×350 | 457 | 355.6 | 381 |
4 ×1 1/2 | 100 ×40 | 114.3 | 48.3 | 102 | 18 × 12 | 450 ×300 | 457 | 323.8 | 381 |
18 × 10 | 450 ×250 | 457 | 273 | 381 | |||||
20 × 18 | 500 × 450 | 508 | 457 | 508 | 36 × 34 | 900 × 850 | 914 | 864 | 610 |
20 × 16 | 500 × 400 | 508 | 406.4 | 508 | 36 × 32 | 900 × 800 | 914 | 813 | 610 |
20 × 14 | 500 × 350 | 508 | 355.6 | 508 | 36 × 30 | 900 × 750 | 914 | 762 | 610 |
20 × 12 | 500 × 300 | 508 | 323.8 | 508 | 36 × 28 | 900 × 700 | 914 | 660 | 610 |
36 × 26 | 900 × 650 | 914 | 610 | 610 | |||||
22 × 20 | 550 × 500 | 559 | 508 | 508 | |||||
22 × 18 | 550 × 450 | 559 | 457 | 508 | 38 × 36 | 950 × 900 | 965 | 914 | 610 |
22 × 16 | 550 × 400 | 559 | 406.4 | 508 | 38 × 34 | 950 × 850 | 965 | 864 | 610 |
22 × 14 | 550 × 350 | 559 | 355.4 | 508 | 38 × 32 | 950 × 800 | 965 | 813 | 610 |
24 × 22 | 600 × 550 | 610 | 559 | 508 | 38 × 30 | 950 × 750 | 965 | 762 | 610 |
24 × 20 | 600 × 500 | 610 | 508 | 508 | 38 × 28 | 950 × 700 | 965 | 711 | 610 |
24 × 18 | 600 × 450 | 610 | 457 | 508 | 38 × 26 | 950 × 650 | 965 | 660 | 610 |
24 × 16 | 600 × 400 | 610 | 406.4 | 508 | 40 × 38 | 1000 × 950 | 1016 | 965 | 610 |
26 × 24 | 650 × 600 | 660 | 610 | 610 | 40 × 34 | 1000 × 850 | 1016 | 864 | 610 |
26 × 22 | 650 × 550 | 660 | 559 | 610 | 40 × 32 | 1000 × 800 | 1016 | 813 | 610 |
26 × 20 | 650 × 500 | 660 | 508 | 610 | 40 × 30 | 1000 × 750 | 1016 | 762 | 610 |
26 × 18 | 650 × 450 | 660 | 457 | 610 | 40 × 36 | 1000 × 900 | 1016 | 914 | 610 |
28 × 26 | 700 × 650 | 711 | 660 | 610 | 42 × 40 | 1050 × 1000 | 1067 | 1016 | 610 |
42 × 38 | 1050 × 950 | 1067 | 965 | 610 | |||||
28 × 24 | 700 × 600 | 711 | 610 | 610 | 42 × 36 | 1050 × 900 | 1067 | 914 | 610 |
28 × 22 | 700 × 550 | 711 | 508 | 610 | 42 × 34 | 1050 × 850 | 1067 | 864 | 610 |
28 × 20 | 700 × 500 | 711 | 457 | 610 | 42 × 32 | 1050 × 800 | 1067 | 813 | 610 |
30 × 28 | 750 × 700 | 762 | 711 | 610 | 42 × 30 | 1050 × 750 | 1067 | 762 | 610 |
30 × 26 | 750 × 650 | 762 | 660 | 610 | 44 × 42 | 1100 × 1050 | 1118 | 1067 | 610 |
30 × 24 | 750 × 600 | 762 | 610 | 610 | 44 × 40 | 1100 × 1000 | 1118 | 1016 | 610 |
30 × 22 | 750 × 550 | 762 | 508 | 610 | 44 × 38 | 1100 × 950 | 1118 | 965 | 610 |
32 × 30 | 800 × 750 | 813 | 762 | 610 | 44 × 36 | 1100 × 900 | 1118 | 914 | 610 |
32 × 28 | 800 × 700 | 813 | 711 | 610 | 46 × 44 | 1150 × 1100 | 1168 | 1118 | 711 |
32 × 26 | 800 × 650 | 813 | 660 | 610 | 46 × 42 | 1150 × 1050 | 1168 | 1067 | 711 |
32 × 24 | 800 × 600 | 813 | 610 | 610 | 46 × 40 | 1150 × 1000 | 1168 | 1016 | 711 |
34 × 32 | 850 × 800 | 864 | 813 | 610 | 46 × 38 | 1150 × 950 | 1168 | 965 | 711 |
34 × 30 | 850 × 750 | 864 | 762 | 610 | 48 × 46 | 1200 × 1150 | 1219 | 1168 | 711 |
34 × 28 | 850 × 700 | 864 | 660 | 610 | 48 × 44 | 1200 × 1100 | 1219 | 1118 | 711 |
34 × 26 | 850 × 650 | 864 | 610 | 610 | 48 × 42 | 1200 × 1050 | 1219 | 1067 | 711 |
48 × 40 | 1200 × 1000 | 1219 | 1016 | 711 | |||||
NOTE: All dimensions are in millimeters.
The following table summarizes approximate pipe reducer price based on material and size.
Material Grade | NPS Range | Price Range (USD) | Influencers |
Carbon Steel (ASTM A234) | ½" to 2" | 15−50 | Wall thickness, order volume |
Stainless Steel 304/316 | ½" to 4" | 25−150 | Nickel/chromium market prices |
Duplex Steel | 2" to 6" | 80−300 | Molybdenum content, supply chain |
Large-Size Reducers (CS) | 10" to 24" | 200−1,000 | Fabrication labor, shipping costs |
Stainless steel pipe reducers' price varies based on several factors, including material grade, size, schedule, type, quantity ordered, and market conditions such as raw material costs and supply chain.
As of 2025, stainless steel prices have been influenced by global demand and commodity trends, but we JN aim to provide competitive prices.
If you require stainless steel pipe reducers, our team can customize sizes and offer highly competitive prices. Contact us today for consultation or a quote.
