Slip On Flanges
Slip On Flanges are widely used components in industrial piping systems. They are designed to slide over the outside of a pipe, with the bore slightly larger than the pipe diameter to allow easy alignment during installation. Once positioned correctly, the flange is secured with fillet welds on both the inner and outer sides, helping create a strong and leak-resistant connection. Slip-On Pipe Flanges are simpler to line up compared to weld neck types, saving field installation time. Performance is steady in everyday operations.
Bhansali Overseas is a trusted manufacturer of these components to strict standards. We are an ISO certified stockist in Mumbai with decades of experience. Our warehouse keeps heavy stocks ready for immediate delivery.
Buyers mostly use these SO Flanges for low to medium pressure piping applications. Application may include standard flat flanges or Raised Face Slip On Flanges. We supply ANSI Slip On Flanges to global markets.
Slip On Flanges Specifications
Dimensions must match exact system codes. We make these flanges according to ASME B16.5 for smaller piping runs and ASME B16.47 when handling larger lines. They come as forged parts or are cut directly from heavy plate stock. Our facility tracks manufacturing requirements for DIN, EN, BS, and JIS standards. Size range spans from tiny half-inch lines up to massive forty-eight-inch industrial mains. Face types match standard sealing gaskets. Pressure ratings handle standard industrial limits. We check every single order against tolerance sheets before shipping out from Mumbai.
| Parameter | Specification |
| Standards | ASTM, ASME, ANSI, DIN, EN, BS, JIS |
| Size Range | 1/2" to 48" |
| Pressure Classes | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Face Types | RF, FF, RTJ |
| Methods | Forged, Plate Cut |
| Dimensions | ASME B16.5, B16.47 |
Types of Slip On Flanges
Different piping layouts need specific face styles to seal properly.
Raised Face (RF) Slip On Flanges
This type has a small raised lip around the bore. It puts extra pressure on the gasket to stop leaks.
Flat Face (FF) Slip On Flanges
The face is totally flat. This prevents cracking when you bolt it to fragile cast iron valves or pumps.
Ring Type Joint (RTJ) Slip On Flanges
Features a deep machined groove. It holds a metal ring gasket for high temperature lines.
Hubbed Slip On Flanges
These have a thick steel hub around the neck. The extra metal gives reinforcement against mechanical pipe stress.
Plate Slip On Flanges
Basic rings cut right from steel plate. These work well for low pressure utility lines where costs must stay low.
Custom Slip On Flanges
Machined to odd dimensions. They match old machinery or unique plant setups that do not follow standard charts.
Materials & Grades Available in Slip On Flanges
The fluid inside the line dictates what metal you need. Temperature fluctuations, pressure surges, and chemical corrosion make grade selection critical. Carbon steel works fine for water or oil lines. Stainless steel handles moisture without rusting. For acids or extreme heat, you step up to nickel alloys.
Bhansali Overseas stocks raw materials to build these fittings using various metals. Duplex grades give high strength that lets you use thinner walls. Monel and Inconel handle tough chemical processing environments. Titanium works when weight and extreme corrosion resistance matter. Copper-nickel is well-suited to saltwater service. We provide mill test certificates with every shipment. Our facility handles custom requests daily. We keep common sizes ready on the shelf to avoid project delays. This keeps your field crew working instead of waiting on shipments
| Material | Available Grades |
| Stainless Steel | 304, 304L, 316, 316L, 310, 321, 347 |
| Carbon Steel | ASTM A105, A350 LF2, A694 |
| Alloy Steel | ASTM A182 F1, F5, F9, F11, F22, F91 |
| Duplex Steel | F51, F53, F55, S31803, S32750 |
| Nickel Alloys | Monel 400, K500, Inconel 600, 625 |
| Hastelloy | Hastelloy C276, C22 |
| Titanium | Grade 2, Grade 5 |
| Copper Nickel | 90/10, 70/30 |
Applications of Slip On Flanges
Engineers pick these components because they keep project costs down. They are economical to purchase and quick to install. You just cut the pipe square and slide them on, saving fabrication labor.
They are found in these fields:
- Oil & Gas: Fits low pressure gathering lines and storage facility utility piping.
- Petrochemical & Chemical: Used in secondary process lines and cooling loops.
- Water Treatment: Found in municipal filtration plants and industrial wastewater lines.
- Power Generation: Handles low pressure steam cooling systems and auxiliary water lines.
- Marine & Offshore: Works on ship ballast systems and general utility plumbing.
- Food & Pharmaceutical: Stainless steel versions connect processing equipment handling clean fluids.
- Pulp & Paper: Fits liquor lines, stock preparation, and water recycling systems.
FAQs
They are less expensive up front than weld neck flanges. The pipe slides inside. Easier to align them on the pipe. This reduces field fabrication time and labor.
Slip on flanges slide over the pipe and need fillet welds inside and out. Weld neck flanges have a tapered hub that butt-welds directly to the pipe end, handling higher stress.
They are made in Class 150, 300, 600, 900, and 1500. While Class 2500 exists on paper, it is rarely used for slip ons because thick welds are difficult to execute.
We make them in carbon steel, alloy steel and stainless steel grades such as 304 and 316. We also use Monel, Inconel, Hastelloy, titanium, and copper nickel for corrosive setups.
They are found in low pressure utility systems, cooling water systems and non critical process lines. They are best used in applications where the temperature is moderate and there is little mechanical vibration.
Not usually. The double fillet weld does not hold up against high fatigue or extreme pressure cycles. Weld neck flanges are preferred when pressures climb to dangerous levels.
Yes. Bhansali Overseas modifies these parts routinely. We change the thickness, change the bolt circle or change the outside diameter for older equipment or special layout needs.
Slip On Flanges Application Industry
