A Reducing Flange (also called a reducer flange) lets you change pipe size at the flanged connection without a separate reducer spool.
It delivers a clean, compact transition that saves space, lowers weld count, and speeds installation.
Across Riyadh, Dammam, Jeddah, Jubail, and Al-Khobar, engineers choose the Reducing Flange in Saudi for oil & gas, petrochemical, power, water treatment, and marine projects.
A reducing flange has the bolt circle and facing of the larger size, while the bore matches the smaller pipe.
You butt-weld the small pipe to the flange’s tapered hub, then bolt the larger face to valves, equipment, or mating flanges.
This one piece replaces a standard flange + concentric reducer, cutting length and fabrication time.
Common transitions include 2″ × 1″, 3″ × 2″, 4″ × 2″, 4″ × 3″, and 6″ × 4″, with custom steps available.
Space Saver: Achieve the size change at the joint—ideal for skids and tight pipe racks.
Fewer Welds: One forged component reduces potential leak points and NDE scope.
Smooth Flow: Tapered hub promotes stable flow and minimizes turbulence.
Flexible Pairings: Works with RF or RTJ gasket faces across ASME pressure classes.
Material Options: Carbon, LTCS, stainless, duplex/super duplex, and nickel alloys.
Lower Installed Cost: Less fabrication, faster shutdown work, simpler documentation.
Valve / Pump Interfaces: Connect a smaller line to a larger valve, pump, meter, or nozzle.
Brownfield Debottlenecking: Add capacity or re-rate tie-ins without reworking long pipe runs.
Offshore Modules & Desalination: Save weight and space on cooling-water and process headers.
Refinery & Petrochem Turnarounds: Speed up replacements and layout changes.
Utilities & Power: Neat step-downs on steam, condensate, air, and cooling circuits.
ASME B16.5 – Pipe Flanges and Flanged Fittings
ASME B16.47 – Large Diameter Steel Flanges (Series A/B)
ASME B16.25 – Buttwelding Ends (bevel details)
ASME B31.3 – Process Piping (fabrication & examination)
ISO 7005 – Metallic Flanges
NACE MR0175 / ISO 15156 – H₂S (Sour) Service Materials
1) Reducing flange vs. concentric reducer + flange—what’s the gain?
You save space and welds. One part replaces two, speeding installation and inspection.
2) Can I use RTJ for high pressure?
Yes. RTJ with the correct ASME class is standard for high pressure/temperature service.
3) How many sizes can I step down?
One size is common; larger steps are possible—check stress, bolting, and flow limits.
4) Which materials suit seawater or chlorides?
Use 316L, duplex (F51), or super duplex (F53/F55); consider CRA overlays for CS hubs.
5) Do you supply sour-service documentation?
Yes—conform to NACE MR0175/ISO 15156 with hardness control and chemistry records.
6) What data do you need for a quote?
Provide run pipe size & schedule (small side), mating flange size & class (large side), material, face (RF/RTJ), quantity, and design conditions.
7) Where can I buy Reducing Flanges in Saudi?
From Nassguard, serving Riyadh, Dammam, Jeddah, Jubail, and Al-Khobar.
A Reducing Flange gives you a compact, code-compliant size transition at the joint.
You’ll cut welds, save space, and keep ASME integrity across demanding services.
For engineered Reducing Flange in Saudi, trust Nassguard—materials, classes, and documentation tailored to your project.
| Specification | Details |
|---|---|
| Product Name | Reducing Flange (Reducer Flange) |
| Typical Transitions | 2″×1″, 3″×2″, 4″×2″, 4″×3″, 6″×4″ (others on request) |
| Pressure Classes | ASME 150, 300, 600, 900, 1500, 2500 |
| Facing Options | RF (Raised Face), RTJ (R/RX/BX as specified), FF on request |
| Bore | Matches smaller pipe size & schedule |
| Materials | ASTM A105/A105N (CS), A350 LF2 (LTCS), A182 F304/L, F316/L (SS), F51/F53/F55 (Duplex/Super Duplex), A694 F52–F65 (High-yield), Alloy 625/825 |
| End Prep | Bevel per ASME B16.25 (butt-weld to pipe) |
| Manufacture | Forged, heat-treated, CNC-machined; tapered hub |
| Testing | Visual & dimensional, PMI, UT/MT/PT; hydro if specified |
| Docs | MTC EN 10204 3.1/3.2, heat traceability, NDE reports |
| Supplier | Nassguard – Saudi Arabia |