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Offset Reducer

Offset Reducer : Specifications | Materials | Dimensions | Weight Chart | Tolerances | FAQ

Premium Manufacturer & Exporter of ASME B16.9 Buttweld Offset Reducers – Offering a wide range of Seamless and Welded Reducers (½” to 24”, SCH 40 / SCH 80) in Stainless, Carbon, and Alloy Steel for Oil & Gas, Petrochemical, and Power Applications across India, Qatar, Oman, Malaysia, and South Africa.

ASME B16.9 Buttweld Offset Reducer Exporter

Best Export Prices: sales@midlandforgefittings.com

Midland Forge and Fittings Pvt. Ltd is a leading manufacturer and exporter of high-quality buttweld offset reducers, along with a wide range of forged and industrial fittings. Committed to precision engineering and strict quality standards, the company delivers products that comply with international codes such as ASME, ASTM, EN, and ISO. Our offset reducers are available in stainless steel, carbon steel, and alloy steel, engineered for critical applications in industries worldwide.

Innovation and reliability drive every solution we offer. Advanced manufacturing facilities, coupled with rigorous testing and inspection protocols, ensure each offset reducer provides exceptional durability, dimensional accuracy, and optimal performance under demanding conditions. By delivering customized and timely solutions, we have earned the trust of clients across global markets, establishing a reputation as a preferred partner for high-performance piping systems.

A buttweld offset reducer is a specialized pipe fitting used to connect two pipes of different diameters while accommodating a slight lateral or angular misalignment between them. It allows smooth fluid flow by gradually reducing the pipe size, minimizing turbulence and pressure drop in the system.

Offset reducers are typically manufactured using seamless or welded stainless steel, carbon steel, or alloy steel through processes like hot forging, cold forming, or butt welding, followed by precision machining and heat treatment to meet industry standards such as ASME B16.9. These fittings are widely used in oil & gas, petrochemical, power plants, water treatment, and industrial piping systems, where precise alignment and reliable flow performance are critical.

ASME B16.9

Industrial Pipe Offset Reducer - Specifications, Sizes & Standards

Size Range – Seamless

½″ NB to 24″ NB (DN15 to DN600)

Wall Thickness

SCH 10S, SCH 20, SCH 40/40S, SCH 60, SCH 80/80S, SCH 100, SCH 120, SCH 140, SCH 160, SCH XXS

Marking

Grade, Size, Schedule, Heat No., Standard, Manufacturer Name

Fitting Types

Offset Reducer

Size Range – Welded

½″ NB to 48″ NB (DN15 to DN1200)

Ends Connection

Beveled Ends as per ASME B16.25 (for butt welding)

Manufacturing Standards

ASME B16.9, ASME B16.28, MSS SP-43 (for SS light fittings), MSS SP-75 (for large diameter high-strength)

Materials

Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, Super Duplex, Nickel, Inconel, Incoloy, Hastelloy, Monel, Alloy 20, 254 SMO, Copper Nickel, Titanium.

Size Range – Fabricated

Above 24″ NB (DN600) as per drawing / custom requirement

Dimensional Standards

ANSI/ASME B36.10 (CS) & B36.19 (SS) for pipe schedules

Testing

Hydrostatic Test, Visual Inspection, Radiography (RT), Ultrasonic (UT), PMI, Third Party Inspection (BV, SGS, TUV)

Surface Finish

Pickled & Passivated (SS), Black (CS), Sandblasted or as required
ASME B16.9 / MSS-SP-43

Seamless & Welded Offset Reducer – Materials, Grades & Standards

Material Category Grade Standards (ASTM / ASME) Typical Use/Application
Stainless Steel 304 / 304L / 304H ASTM A403 WP304/304L/304H General purpose, corrosion resistance
316 / 316L / 316HASTM A403 WP316/316L/316HMarine & chemical applications
317 / 317LASTM A403 WP317/317LHigh corrosion resistance
321 / 321HASTM A403 WP321/321HHigh temperature, stabilized
347 / 347HASTM A403 WP347/347HHigh-temp pressure systems
904LASTM A403 WP904L / B625Acid handling, sulfuric environments
254 SMOASTM A403 / B366High chloride environments
Carbon Steel A234 WPB / WPC ASTM A234 Pressure piping & general piping systems
A420 WPL6ASTM A420Low temperature services
Alloy Steel A234 WP1 / WP5 / WP9 ASTM A234 High-temp & pressure pipelines
A234 WP11 / WP22ASTM A234Steam lines & refineries
A234 WP91ASTM A234Power generation, high performance
Duplex Steel UNS S31803 / S32205 ASTM A815 / A790 Corrosion & high strength use
Super Duplex Steel UNS S32750 / S32760 ASTM A815 / A790 Offshore, seawater applications
Nickel Alloys Nickel 200 / 201 ASTM B366 / B162 Alkali & chemical processing
Inconel 600 / 625 / 718ASTM B366Heat exchangers, aerospace
Incoloy 800 / 825ASTM B366Petrochemical & chemical processing
Hastelloy C22 / C276ASTM B366Severe corrosion resistance
Monel 400 / K500ASTM B366Seawater, chemical industries
Alloy 20ASTM B366Sulfuric acid services
Nimonic 75 / 80AASTM B366 / B637High-temp applications
Copper Nickel Cu-Ni 90/10 / 70/30 ASTM B466 / B467 Marine systems, seawater service
Titanium Grade 2 / Grade 5 ASTM B363 Lightweight, corrosion resistance
Aluminium 6061 / 5083 ASTM B361 Low-pressure, non-corrosive piping
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Dimensions of ASME B16.9 Offset Reducer

Dimensions of ANSI/ASME B16.9 Offset Reducer
No. Reducer (NPS) D — Large OD (mm / in) d — Small OD (mm / in) L — Overall length H (mm / in)
1 3/4 × 1/2 26.7 / 1.051 in 21.3 / 0.839 in 38 / 1.496 in
2 1 × 1/2 33.4 / 1.315 in 21.3 / 0.839 in 51 / 2.008 in
3 1 × 3/4 33.4 / 1.315 in 26.7 / 1.051 in 51 / 2.008 in
4 1¼ × 1/2 42.2 / 1.661 in 21.3 / 0.839 in 51 / 2.008 in
5 1¼ × 3/4 42.2 / 1.661 in 26.7 / 1.051 in 51 / 2.008 in
6 1¼ × 1 42.2 / 1.661 in 33.4 / 1.315 in 51 / 2.008 in
7 1½ × 1/2 48.3 / 1.902 in 21.3 / 0.839 in 64 / 2.520 in
8 1½ × 3/4 48.3 / 1.902 in 26.7 / 1.051 in 64 / 2.520 in
9 1½ × 1 48.3 / 1.902 in 33.4 / 1.315 in 64 / 2.520 in
10 1½ × 1¼ 48.3 / 1.902 in 42.2 / 1.661 in 64 / 2.520 in
11 2 × 3/4 60.3 / 2.374 in 26.7 / 1.051 in 76 / 2.992 in
12 2 × 1 60.3 / 2.374 in 33.4 / 1.315 in 76 / 2.992 in
13 2 × 1¼ 60.3 / 2.374 in 42.2 / 1.661 in 76 / 2.992 in
14 2 × 1½ 60.3 / 2.374 in 48.3 / 1.902 in 76 / 2.992 in
15 2½ × 1 73.0 / 2.874 in 33.4 / 1.315 in 89 / 3.504 in
16 2½ × 1¼ 73.0 / 2.874 in 42.2 / 1.661 in 89 / 3.504 in
17 2½ × 1½ 73.0 / 2.874 in 48.3 / 1.902 in 89 / 3.504 in
18 2½ × 2 73.0 / 2.874 in 60.3 / 2.374 in 89 / 3.504 in
19 3 × 1¼ 88.9 / 3.500 in 42.2 / 1.661 in 89 / 3.504 in
20 3 × 1½ 88.9 / 3.500 in 48.3 / 1.902 in 89 / 3.504 in
21 3 × 2 88.9 / 3.500 in 60.3 / 2.374 in 89 / 3.504 in
22 3 × 2½ 88.9 / 3.500 in 73.0 / 2.874 in 89 / 3.504 in
23 3½ × 1¼ 101.6 / 4.000 in 42.2 / 1.661 in 102 / 4.016 in
24 3½ × 1½ 101.6 / 4.000 in 48.3 / 1.902 in 102 / 4.016 in
25 3½ × 2 101.6 / 4.000 in 60.3 / 2.374 in 102 / 4.016 in
26 3½ × 2½ 101.6 / 4.000 in 73.0 / 2.874 in 102 / 4.016 in
27 3½ × 3 101.6 / 4.000 in 88.9 / 3.500 in 102 / 4.016 in
28 4 × 1½ 114.3 / 4.500 in 48.3 / 1.902 in 102 / 4.016 in
29 4 × 2 114.3 / 4.500 in 60.3 / 2.374 in 102 / 4.016 in
30 4 × 2½ 114.3 / 4.500 in 73.0 / 2.874 in 102 / 4.016 in
31 4 × 3 114.3 / 4.500 in 88.9 / 3.500 in 102 / 4.016 in
32 4 × 3½ 114.3 / 4.500 in 101.6 / 4.000 in 102 / 4.016 in
33 5 × 2 141.3 / 5.563 in 60.3 / 2.374 in 127 / 5.000 in
34 5 × 2½ 141.3 / 5.563 in 73.0 / 2.874 in 127 / 5.000 in
35 5 × 3 141.3 / 5.563 in 88.9 / 3.500 in 127 / 5.000 in
36 5 × 3½ 141.3 / 5.563 in 101.6 / 4.000 in 127 / 5.000 in
37 5 × 4 141.3 / 5.563 in 114.3 / 4.500 in 127 / 5.000 in
38 6 × 2½ 168.3 / 6.627 in 73.0 / 2.874 in 140 / 5.512 in
39 6 × 3 168.3 / 6.627 in 88.9 / 3.500 in 140 / 5.512 in
40 6 × 3½ 168.3 / 6.627 in 101.6 / 4.000 in 140 / 5.512 in
41 6 × 4 168.3 / 6.627 in 114.3 / 4.500 in 140 / 5.512 in
42 6 × 5 168.3 / 6.627 in 141.3 / 5.563 in 140 / 5.512 in
43 8 × 3½ 219.1 / 8.628 in 101.6 / 4.000 in 152 / 5.984 in
44 8 × 4 219.1 / 8.628 in 114.3 / 4.500 in 152 / 5.984 in
45 8 × 5 219.1 / 8.628 in 141.3 / 5.563 in 152 / 5.984 in
46 8 × 6 219.1 / 8.628 in 168.3 / 6.627 in 152 / 5.984 in
47 10 × 4 273.0 / 10.748 in 114.3 / 4.500 in 178 / 7.008 in
48 10 × 5 273.0 / 10.748 in 141.3 / 5.563 in 178 / 7.008 in
49 10 × 6 273.0 / 10.748 in 168.3 / 6.627 in 178 / 7.008 in
50 10 × 8 273.0 / 10.748 in 219.1 / 8.628 in 178 / 7.008 in
51 12 × 5 323.9 / 12.748 in 141.3 / 5.563 in 203 / 7.992 in
52 12 × 6 323.9 / 12.748 in 168.3 / 6.627 in 203 / 7.992 in
53 12 × 8 323.9 / 12.748 in 219.1 / 8.628 in 203 / 7.992 in
54 12 × 10 323.9 / 12.748 in 273.0 / 10.748 in 203 / 7.992 in

Weight Chart: High-Pressure Offset Reducer (SCH 40 / STD)

Nominal Pipe Size (NPS) Sch 10S (kg) Sch 40/STD (kg) Sch 80/XS (kg) Sch XXS (kg)
1/2″ × 1/4″ 0.12 0.15 0.18 0.20
3/4″ × 1/2″ 0.20 0.28 0.32 0.38
1″ × 3/4″ 0.32 0.40 0.48 0.55
1-1/4″ × 1″ 0.48 0.65 0.75 0.85
1-1/2″ × 1″ 0.55 0.75 0.90 1.05
2″ × 1-1/2″ 0.80 1.05 1.30 1.50
2-1/2″ × 2″ 1.05 1.40 1.75 2.05
3″ × 2″ 1.40 1.85 2.30 2.70
4″ × 3″ 2.15 2.90 3.50 4.10
6″ × 4″ 3.90 5.30 6.40 7.50
8″ × 6″ 6.60 8.90 10.70 12.50
10″ × 8″ 10.50 14.10 16.90 19.80
12″ × 10″ 15.20 20.40 24.50 28.70

Schedule 40 / Schedule 80 Offset Reducer - Tolerances as per ASME B16.9

Dimension Tolerance Notes
Outside Diameter (OD) ±0.5% of OD or ±1.6 mm (whichever is greater) Ensures proper fit with adjoining pipes
Wall Thickness ±12.5% of nominal wall thickness Applies to all schedules (Sch 10S, 40, 80, XS, XXS)
Overall Length (L) ±1.6 mm for NPS ≤ 6″, ±2.4 mm for
NPS 8″–12″, ±3.2 mm for NPS 14″–24″		 Maintains piping layout dimensions
Center-to-End Distance ±1.6 mm for NPS ≤ 6″, ±2.4 mm for
NPS 8″–12″, ±3.2 mm for NPS 14″–24″		 Critical for offset reducers and elbows
Offset/Centerline Deviation ±3% of the nominal offset distance Ensures correct alignment in the piping system
End Bevel Angle 37.5° ± 2.5° (for standard butt weld) As per welding preparation requirements
Inside Diameter (ID) ±0.5% of ID or ±1.6 mm (whichever is greater) Important for flow and pressure calculations
Out-of-Roundness Maximum 1% of nominal diameter Prevents improper welding fit-up
Concentricity of Reducer Maximum 1% of nominal diameter
difference between large and small ends		 Critical for flow uniformity and stress distribution
Surface Finish Ra ≤ 6.3 μm (250 μin) typical for pressure piping Ensures smooth internal flow and welding quality
What is a Buttweld Offset Reducer and how does it differ from a standard concentric reducer?
  • Definition of Buttweld Offset Reducer:
    • A Buttweld Offset Reducer is a specialized pipe fitting used to join two pipes of different diameters when their centerlines do not align.
    • It is a buttweld-type fitting, meaning the ends are beveled for full-penetration welding to the adjoining pipes.
    • The offset allows the piping system to change direction laterally or vertically while maintaining a smooth flow transition.
  • Difference from a Concentric Reducer:
    • Concentric Reducer: Aligns the centerlines of the large and small ends, forming a straight, symmetrical taper.
    • Offset Reducer: The centerlines are misaligned, creating an intentional lateral or vertical offset to accommodate piping geometry.
    • This distinction is critical in systems where space restrictions, obstacles, or equipment positioning make a concentric connection impossible.
  • Purpose of Offset Design:
    • To correct misalignment between existing pipelines.
    • To bypass obstructions such as structural beams, valves, or supports.
    • To align pipe connections with equipment nozzles, tanks, or pumps without changing the overall system layout.
  • Flow Considerations:
    • Provides a gradual reduction in diameter while redirecting flow slightly, minimizing turbulence and pressure loss compared to abrupt directional changes.
    • Essential for high-velocity or high-pressure systems, where flow dynamics are critical.
  • Key Advantage over Concentric Reducer:
    • Allows flexibility in piping design without the need for additional elbows or complex pipe arrangements.
    • Reduces the risk of stress concentration and vibration by providing a smooth transition between misaligned pipes.

  • Ends are beveled for butt welding to ensure a full-penetration weld.

  • Welding procedures must follow ASME Section IX or client-specific requirements.

  • Stress-relief or post-weld heat treatment may be needed for high-pressure or high-temperature applications.

  • Proper alignment during installation is critical to prevent pipe stress and flange misalignment.

  • The offset distance is determined by the piping layout constraints or alignment requirement with connected equipment.

  • It is calculated using the formula:

Offset Distance=(Δx)2+(Δy)2Offset\ Distance = \sqrt{(Δx)^2 + (Δy)^2}

where Δx and Δy are horizontal and vertical deviations.

  • Correct calculation is crucial to prevent misalignment, stress concentration, and vibration issues in the piping system.

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