Flange Bell Mouth

Production information:

Midas manufactures ductile iron bell mouth pipe fitting — also known in the trade as DI bell mouth, flanged bellmouth, or bellmouth flange — for water supply, sewage, and pump station projects worldwide. Produced at our own foundry in Shanxi, China, and manufactured to ISO2531, EN545, EN598, and AWWA C110/C153, our bell mouth pipe fitting is available from DN50 to DN2600, with flanged connection on one end and a flared bell-shaped opening on the other for smooth entry or discharge of flow. If your project drawing calls for a flanged bell mouth at a pump station intake, tank outlet, or channel discharge point, view the full specification below or send us your submittal for a matched quotation.

Product Specifications

Choosing the Right Fitting: Bell Mouth vs Flanged Reducer vs Duckfoot Bend

Because bell mouth pipe fitting shares a similar cast, flanged appearance with several other ductile iron fittings, it's worth confirming you're specifying the right part before ordering:

Bell Mouth Pipe Fitting vs Flanged Reducer: A flanged reducer connects two pipe sections of different diameters in-line, with both ends designed to bolt to another pipe or fitting. A bell mouth pipe fitting has only one flanged end — the other end is a flared, open discharge into a tank, channel, wet well, or open water body. If both ends of your fitting need to connect to pipework, you need a reducer, not a bell mouth. See our Double Flanged Reducer for in-line diameter transitions.

Bell Mouth Pipe Fitting vs Duckfoot Bend: A duckfoot bend changes pipe direction (typically 90°) while providing a flat, bolted base for floor or foundation support — commonly used where a vertical riser turns to connect into a pump or valve at floor level. A bell mouth does not change direction; it widens the flow path at an open discharge or intake point. Pump station layouts often use both: a duckfoot bend to bring the riser down to floor level, and a bell mouth at the point where the line opens into the wet well or sump. See our Ductile Iron Double Flange Duckfoot Bend Elbow for this application.

Bell Mouth Pipe Fitting vs Flange Socket: A flange socket adapts a flanged connection to a push-on socket joint, used to transition between above-ground bolted sections and buried spigot-and-socket pipe. It does not have a flared opening and is not intended for intake or discharge applications.

If your project drawing simply labels a part "flanged fitting" without a clear callout, send us the layout and connection points — our team can confirm whether a bell mouth, reducer, or bend is the correct specification before you place an order.

Selecting the Right Bellmouth Variant and Lining

Not all bell mouth pipe fitting configurations are the same, and the right choice depends on the installation point:

Standard Flanged Bellmouth: The standard configuration, with a bolted flange on one end and a flared opening on the other, used for pump station intakes, tank outlets, and channel discharge points where the fitting sits within open water or a wet well rather than passing through a structural wall.

Puddle Flange Bellmouth: A variant that includes an integral puddle collar cast around the pipe body, used where the fitting passes directly through a concrete tank or reservoir wall. The puddle collar bonds with the poured concrete to prevent water seepage along the pipe wall — this is a common point of confusion, since a standard bellmouth without a puddle collar will not provide a watertight wall penetration. If your bellmouth is going through a tank or reservoir wall rather than sitting inside the open water, confirm with us whether you need the puddle flange version.

Lining and Coating by Application: Cement mortar lining is standard for fittings in continuous contact with potable water or general water supply conditions. For fittings in wet wells, sumps, or sewage applications with variable water chemistry, fusion bonded epoxy (FBE) lining offers smoother, higher corrosion resistance and is often preferred for long-term submerged service. External coating follows the same logic — zinc plus bitumen is standard for buried or submerged sections, while FBE coating is available where a project specification calls for a higher-grade finish.

If you're unsure which variant or lining suits your installation, send us the wall penetration detail or intake drawing from your project and we will confirm the correct configuration as part of your quotation.

Where Bell Mouth Pipe Fitting Is Used

Pump Station Intake & Discharge: Installed at the suction or discharge point of a pumping station to reduce inlet velocity, minimize turbulence, and protect pump efficiency — one of the most common applications for this fitting.

Water Treatment Plant & Reservoir Outlets: Connects pipeline sections to clear water tanks, reservoirs, or sedimentation basins, where a smooth flared opening prevents vortex formation and uneven draw-down.

Sewage & Stormwater Discharge: Used at outfall structures in sewage and stormwater systems, where flanged bellmouth fittings direct discharge flow into channels or receiving structures without abrupt velocity change.

Tank & Channel Wall Penetration: Fitted through concrete tank or channel walls as a flanged connection point, sometimes specified with a puddle flange for watertight wall penetration.

Irrigation & Industrial Process Water: Used at intake points for irrigation pumping stations and industrial process water systems where a controlled, low-turbulence entry point is required.

If you're unsure whether your project needs a bell mouth pipe fitting versus a standard flanged reducer, send us your layout drawing — we'll confirm the correct fitting based on flow direction and installation point.

Customization

Midas casts bell mouth pipe fitting in-house at our own foundry in Shanxi Province, rather than sourcing through third-party casting shops — giving us direct control over wall thickness, flange dimension accuracy, and casting quality on every order. We accept drawing-based custom orders, including non-standard flange drilling patterns, custom D/L dimensions to match existing pipe or structure openings, project-specific coating (cement lining, FBE, or bitumen), and OEM branding for private-label supply. With advanced casting and machining equipment and a documented quality control system covering raw material through final inspection, our bell mouth pipe fitting and wider ductile iron fitting range have been supplied to water and infrastructure projects across Africa, the Middle East, South America, and Southeast Asia.

FAQ

Q:What is the difference between a bell mouth pipe fitting and a flanged reducer?
A flanged reducer connects two pipe sections of different diameters in-line, while a bell mouth pipe fitting has a flared, open end designed for intake or discharge into a tank, channel, or open water body — it is not intended to connect to another pipe on the flared end.

Q:Can bell mouth pipe fitting be custom-sized to match an existing structure opening?
Yes, we produce to buyer-supplied drawings, including custom D (flare diameter) and L (length) to match an existing wall opening, tank connection, or pump sump design.

Q:What coating is recommended for submerged or wet-well installation?
Cement mortar lining with zinc and bitumen external coating is standard for buried and submerged conditions; fusion bonded epoxy is available where a smoother, higher-corrosion-resistance finish is required.

Q:Do you provide fittings compatible with pipe from other manufacturers?
Yes, our bell mouth pipe fitting is manufactured to standard ISO2531/EN545/EN598/AWWA dimensions and is compatible with ductile iron pipe from other manufacturers built to the same standards.

Get a Quote for Your Bell Mouth Pipe Fitting Project

Send us your project drawing, required DN size, pressure class, and quantity, and our team will confirm specification, lead time, and pricing within 24 hours. Whether you are sourcing for a pump station intake, a treatment plant outlet, or a full pipeline package, Midas supplies bell mouth pipe fitting and matching ductile iron pipe from a single, factory-direct source.