Description
Stainless Steel Pipe Flange Reducer Adapter 8.25" to 3.25" A182 F304 B16.5 150LB
This is a heavy-duty stainless steel concentric pipe flange reducer adapter, transitioning from an 8.25" inner diameter large port down to a 3.25" inner diameter small port. Constructed to ANSI/ASME B16.5 standards in A/SA182 F304/304L stainless steel, it features raised-face flanges on both ends and a 1/2" FNPT fitting centered mid-body for instrumentation or auxiliary connections. The large flange carries an 8-bolt pattern and the small flange a 4-bolt pattern, both at 0.75" bolt hole diameter, rated at 150 LB pressure class.
Specifications & What's Included
- Type: Concentric pipe flange reducer adapter, raised face
- Material: Stainless steel, A/SA182 F304/304L
- Standard: ANSI/ASME B16.5
- Pressure class: 150 LB
- Wall schedule: S10S (Schedule 10S)
- Large port OD: 13.5 in (340 mm)
- Large port ID (bore): 8.25 in (210 mm)
- Large port bolt holes: 8 x 0.75 in
- Large port raised face diameter: 10.625 in (270 mm)
- Small port OD: 7.5 in (190 mm)
- Small port ID (bore): 3.25 in (83 mm)
- Small port bolt holes: 4 x 0.75 in
- Small port raised face diameter: 5 in (130 mm)
- Mid-body fitting: 1/2" FNPT (female NPT) — center of reducer body
- No hardware (bolts/gaskets) included
Applications
Pipe flange reducer adapters like this are used throughout industrial piping systems to connect two pipes or vessels of different nominal bore sizes within the same flanged pipeline. The ANSI/ASME B16.5 standard governs pipe flanges and flanged fittings from NPS 1/2 through NPS 24, making B16.5-rated components interchangeable across a wide range of industrial applications worldwide. F304/304L stainless steel is a standard austenitic grade widely used in chemical processing, pharmaceutical manufacturing, food and beverage, oil and gas, pulp and paper, and general industrial fluid handling — chosen for its corrosion resistance, weldability, and performance across a broad temperature range. The 150 LB pressure class is the most common flanged piping pressure rating for lower-pressure process lines. The integral 1/2" FNPT side port is typically used for pressure taps, temperature sensor installations, drain connections, or chemical injection points. This type of reducer flange is commonly found in process piping, reactor inlet/outlet connections, tank nozzle transitions, and pump suction or discharge manifolds where a change in line size is required within a bolted-flange piping system.
This Stainless Steel Pipe Flange Reducer Adapter (A/SA182 F304/304L, B16.5 150LB) has been inspected and is in good used condition. The stainless body shows surface discoloration and some oxidation/rust staining, particularly around the mid-flange FNPT fitting and on the interior bore — consistent with prior industrial service. The flange faces and raised face seating surfaces appear intact. The bolt hole patterns on both flanges are free of visible damage. The weld around the 1/2" FNPT side fitting shows heavy oxidation and should be reviewed by the buyer prior to installation. Overall a sound, serviceable piece with typical used industrial wear. Please view our photo set and contact us if you have any questions. Please note: We have multiple units in stock — yours may not be the one shown in the photos, however, it will be similar in condition and function.
Warranty Information
Additional Information
Brand: |
Unbranded |
Model: |
A182 F304/304L B16.5 150LB Flange Reducer |
MPN: |
A/SA182 F304/304L B16.5 |
Type: |
Stainless Steel Pipe Flange Reducer Adapter |
SKU: |
48006 |
Condition: |
Used – Inspected |
Seller Notes: |
Includes 1/2 FNPT mid-flange fitting. No hardware included. |
Material: |
Stainless Steel A/SA182 F304/304L |
Pressure Rating: |
150 LB (ANSI/ASME B16.5) |
Standard: |
ANSI/ASME B16.5 |
Large Port OD: |
13.5 in (340 mm) |
Large Port ID: |
8.25 in (210 mm) |
Large Port Bolt Holes: |
8 x 0.75 in bolt holes |
Large Port Raised Face Diameter: |
10.625 in (270 mm) |
Small Port OD: |
7.5 in (190 mm) |
Small Port ID: |
3.25 in (83 mm) |
Small Port Bolt Holes: |
4 x 0.75 in bolt holes |
Small Port Raised Face Diameter: |
5 in (130 mm) |
Mid-Flange Fitting: |
1/2 in FNPT |
Wall Schedule: |
S10S (Schedule 10S) |
Connection Type: |
Raised Face Flanged |
Country/Region of Manufacture: |
Unknown |
Condition Notes: |
Used stainless steel pipe flange reducer adapter, A/SA182 F304/304L, B16.5 150LB. Inspected and in good used condition. Surface discoloration and oxidation present, especially at FNPT fitting weld. Flange faces intact. |
