✅ Slip-On Flange – High Performance Industrial Pipe Flanges

SSM supplies premium quality Slip-On Flanges, designed for reliable pipe connections, easy installation, and cost-effective solutions in industrial piping, oil & gas, chemical processing, marine, power generation, and water treatment systems.

Manufactured from high-quality carbon steel, stainless steel, and alloy steel materials, slip-on flanges provide excellent mechanical strength, stable sealing performance, and long service life in various operating environments. The slip-on design allows the pipe to be inserted into the flange bore before welding, making installation easier and reducing alignment difficulties compared with welding neck flanges.

With precision machining, accurate bolt hole dimensions, and strict quality control, Slip-On Flanges ensure secure connections between pipes, valves, pumps, and equipment while meeting international standards and customized engineering requirements.

✅ Product Overview

A Slip-On Flange (SO Flange) is a widely used pipe flange that slides over the outside diameter of the pipe before being welded in place. The flange is typically welded both internally and externally to provide sufficient strength and sealing reliability.

Compared with Weld Neck Flanges, slip-on flanges feature a shorter hub design and simpler fabrication process. They are commonly selected for low to medium pressure piping systems where installation convenience, cost efficiency, and maintenance flexibility are important considerations.

✅ Key Features

Product Type:
Slip-On Flange / SO Flange / Slip-On Welding Flange

Material:
Carbon Steel: ASTM A105 / A350 LF2
Stainless Steel: ASTM A182 F304 / F304L / F316 / F316L
Alloy Steel: ASTM A182 F5 / F11 / F22 (Available Options)

Standard:
ASME B16.5 / ASME B16.47 / EN 1092-1 / DIN / JIS / GOST / Custom Standards

Facing Type:
Raised Face (RF) / Flat Face (FF) / Ring Type Joint (RTJ) (Optional)

Connection Type:
Slip-On Welding Connection

Manufacturing Process:
Forging / Cutting / Machining

Welding Method:
Internal Fillet Weld + External Fillet Weld

Surface Finish:
Anti-Rust Oil / Black Painting / Galvanized / Pickled & Passivated

Size Range:
1/2" – 60" (DN15 – DN1500)
(Custom Sizes Available)

Pressure Rating:
Class 150 – Class 1500
PN6 – PN100 (According to Standard and Size)

⚙️ Advantages

✅ Easy Installation

The slip-on design allows the pipe to be inserted into the flange before welding, making alignment easier and reducing installation difficulty.

✅ Cost-Effective Design

Slip-on flanges require less machining and simpler manufacturing processes compared with welding neck flanges, making them an economical choice for many piping applications.

✅ Reliable Welding Performance

Double welding on the inside and outside provides strong mechanical connection and improves sealing reliability.

✅ Flexible Application

Available in a wide range of materials, sizes, pressure classes, and facing types to meet different industrial requirements.

✅ Convenient Maintenance

The simple structure allows easier installation, inspection, and replacement during pipeline maintenance.

✅ Good Dimensional Accuracy

Precision machining ensures accurate bolt hole patterns, flange thickness, and connection dimensions for reliable assembly.

🔧 Typical Material Properties – Stainless Steel 316L

📋 Technical Specifications

✅ Applications

Oil & Gas Industry

Used in pipelines, refineries, storage facilities, and process systems requiring reliable flange connections.

Chemical Processing Plants

Applied in chemical pipelines, reactors, pumps, and equipment connections where corrosion resistance and secure sealing are required.

Water Treatment Systems

Widely used in water supply pipelines, filtration systems, pumps, and industrial water facilities.

Marine Engineering

Suitable for shipbuilding projects, seawater piping, cooling systems, and offshore installations.

Power Generation Facilities

Used in utility piping, cooling water systems, steam auxiliary systems, and industrial equipment connections.

Food & Beverage Processing

Stainless steel slip-on flanges are used in hygienic piping systems requiring corrosion resistance and easy maintenance.

General Industrial Piping

Suitable for connecting pipes, valves, pumps, tanks, and mechanical equipment in various industries.

⚠️ Limitations

Not generally recommended for extremely high-pressure or high-temperature applications compared with welding neck flanges.

The internal weld area may create slight flow disturbance in critical process systems.

Proper welding procedures and inspection are required to ensure connection reliability.

✅ Why Choose SSM

Over 30 years of experience in flange and pipe fitting manufacturing

Professional production according to ASME, ASTM, EN, DIN, and JIS standards

Complete material traceability with MTC / EN10204 3.1 certification

Supply of carbon steel, stainless steel, alloy steel, and special alloy flanges

Advanced forging, machining, drilling, and inspection capabilities

Customized sizes, pressure classes, bolt patterns, and facing types available

Strict quality control ensures dimensional accuracy and reliable performance

Reliable global supply capability with professional technical support

📩 Request A Quote

SSM can supply Slip-On Flanges in various materials, sizes, pressure ratings, drilling standards, and surface finishes to meet industrial piping and engineering project requirements.

Contact SSM today for pricing, technical datasheets, material certificates, and worldwide shipping solutions.