Slip-On Flanges – Types, Uses, Classes & Selection Guide
Slip-On Flanges are widely used flange components for connecting pipes, valves, equipment and other piping components. They are designed to fit over the outside of a pipe and are generally attached by welding.
Their practical design makes Slip-On Flanges a commonly specified option for industrial piping, fabrication and general engineering applications.
Vandan Alloys manufactures and supplies Slip-On Flanges in different sizes, pressure classes, materials, facing configurations and international standards.
What is a Slip-On Flange?
A Slip-On Flange is designed with a bore that allows the pipe to pass through the flange.
The flange is positioned over the pipe and is normally connected using welds around the pipe connection. The exact welding arrangement should follow the applicable fabrication and project requirements.
Slip-On Flanges are commonly selected where a straightforward flange connection is required.
Slip-On Flange Types
Depending on the application, Slip-On Flanges can be supplied in different facing configurations.
Raised Face Slip-On Flange
RF Slip-On Flanges have a raised gasket seating surface and are widely used in industrial piping applications.
Flat Face Slip-On Flange
FF Slip-On Flanges have a flat gasket seating surface and are used where a flat-face connection is specified.
RTJ Slip-On Flange
Where permitted by the applicable standard and configuration, Slip-On Flanges may be supplied with an RTJ facing for ring-type joint applications.
The exact groove dimensions and suitability should be confirmed against the applicable standard.
Slip-On Flange Construction
A typical Slip-On Flange includes:
Flange body
Central bore
Outside diameter
Bolt holes
Bolt circle / PCD
Gasket seating face
Pipe connection area
The flange dimensions depend on the applicable standard, nominal size, pressure class and material.
How is a Slip-On Flange Installed?
The pipe is inserted through the flange bore and positioned according to the required fabrication dimensions.
The flange and pipe are then welded according to the applicable welding procedure and project requirements.
Correct alignment should be maintained during fabrication to ensure that the completed flange connection is suitable for assembly with the mating flange.
Advantages of Slip-On Flanges
Slip-On Flanges are commonly selected for practical fabrication requirements.
Easy Pipe Fit-Up
The pipe passes through the flange bore, which can simplify positioning during fabrication.
Common Industrial Availability
Slip-On Flanges are widely used and available across many standard sizes and pressure classes.
Suitable for General Piping
They are frequently used in industrial, fabrication and utility piping applications where the project specification permits their use.
Flexible Fabrication
Slip-On Flanges can be suitable for various fabrication arrangements, subject to the applicable welding and engineering requirements.
Slip-On Flange Pressure Classes
Common ASME pressure classes include:
Class 150
Class 300
Class 400
Class 600
Class 900
Class 1500
Class 2500
The applicable class depends on the flange size, material, temperature and governing standard.
For EN requirements, customers may specify PN ratings such as:
PN6
PN10
PN16
PN25
PN40
PN63
PN100
PN160
The actual availability of a particular type, size and rating depends on the applicable standard.
Slip-On Flange Size Range
Slip-On Flanges can be supplied for a wide range of nominal pipe sizes.
Requirements may include:
Small diameter piping
Medium diameter piping
Large diameter piping
Project-specific dimensions
Custom flange requirements
For large diameter applications, the relevant flange standard and dimensional series should be confirmed.
Slip-On Flange Bore & Pipe Schedule
The flange bore should correspond to the intended pipe connection.
Customers may specify the pipe schedule or provide:
Pipe OD
Pipe wall thickness
Inside diameter
Bore requirement
Flange dimensions
Common pipe schedules encountered in flange enquiries include SCH 10, SCH 40, SCH 80, SCH 100, SCH 120 and XXS, depending on the project.
The final bore should be confirmed according to the applicable specification rather than assumed from nominal size alone.
Slip-On Flange Materials
Vandan Alloys supplies Slip-On Flanges in a wide range of materials and grades.
Common material groups include:
Carbon Steel
Stainless Steel
Alloy Steel
Duplex Stainless Steel
Super Duplex Stainless Steel
Nickel Alloys
Nickel-Copper Alloys
High Temperature Alloys
Titanium and other special materials
Commonly requested grades include:
ASTM A105
ASTM A105N
ASTM A182 F304
ASTM A182 F304L
ASTM A182 F316
ASTM A182 F316L
F321
F347
F310
F904L
Duplex 2205
Super Duplex 2507
Monel
Inconel
Incoloy
Hastelloy
Material selection should be based on the applicable specification and service conditions.
A105N Slip-On Flanges
ASTM A105N Slip-On Flanges are normalized carbon steel flanges manufactured according to the applicable A105N material requirements.
A105N should be specifically stated in the purchase specification when the normalized condition is required.
Customers can request:
A105N + Slip-On Flange + Size + Class + Facing + Quantity
The final material and dimensional requirements should follow the applicable standard and approved purchase specification.
Stainless Steel Slip-On Flanges
Stainless Steel Slip-On Flanges are commonly selected where corrosion resistance and material compatibility are important.
Typical grades include:
304
304L
316
316L
321
347
310 / 310S
904L
The correct grade depends on the process medium, operating temperature, corrosion conditions and engineering requirements.
Duplex & Super Duplex Slip-On Flanges
Duplex and Super Duplex grades can be selected for applications requiring specific combinations of corrosion resistance and mechanical properties.
Common grades include:
Duplex 2205 – UNS S31803 / S32205
Super Duplex 2507 – UNS S32750 / S32760
The exact material designation should be confirmed in the project specification.
Slip-On Flange Facing Options
Common facing options include:
Raised Face (RF)
Flat Face (FF)
Ring Type Joint (RTJ), where applicable
The flange facing should match the mating flange and gasket arrangement.
Slip-On Flange Standards
Slip-On Flanges can be manufactured or supplied according to applicable international standards, including:
ASME B16.5
ASME B16.47
EN 1092-1
DIN
JIS
BS
Customer drawings and project specifications
The applicable standard should be clearly specified when placing an order.
Slip-On Flange Applications
Slip-On Flanges are used across many industries, including:
Oil & Gas
Petrochemical
Chemical Processing
Refineries
Power Generation
Water Treatment
Marine Industries
Industrial Piping
Process Plants
Fabrication
Engineering Projects
Maintenance & Shutdown Work
Slip-On Flange vs Weld Neck Flange
Both flange types are used to connect piping, but their construction and installation are different.
Slip-On Flange:
The pipe passes through the flange bore and the flange is attached by welding.
Weld Neck Flange:
The flange has a tapered hub and is connected to the pipe through a butt weld.
The appropriate selection depends on the engineering design, service conditions, fabrication requirements and applicable specification.
Slip-On Flange vs Blind Flange
A Slip-On Flange has a central bore for the pipe connection.
A Blind Flange has no central pipe opening and is used to close a piping connection.
They therefore perform different functions in a piping system.
Slip-On Flange Installation Considerations
Before installation, check:
Correct flange size
Pressure class
Material grade
Facing
Bore
Pipe dimensions
Bolt-hole alignment
Gasket compatibility
Flange face condition
The pipe and flange should be properly aligned before welding.
The welding procedure should be carried out by qualified personnel according to the applicable project requirements.
Inspection of Slip-On Flanges
Depending on the purchase specification, inspection may include:
Dimensional inspection
Visual inspection
Face inspection
Bore inspection
Bolt-hole inspection
Material identification
Chemical test documentation
Mechanical test documentation
Heat treatment records where applicable
Third-party inspection
Marking and traceability
Material Test Certificate
For applicable orders, EN 10204 Type 3.1 Material Test Certificates can be supplied.
Documentation can include material chemistry, mechanical properties, heat number and other relevant information according to the applicable material specification.
Custom Slip-On Flanges
Special Slip-On Flanges can be evaluated according to customer drawings or dimensional requirements.
Custom requirements may include:
Special OD
Special ID
Special thickness
Customized PCD
Special bolt-hole arrangement
Special facing
Special bore
Non-standard dimensions
A PDF, CAD drawing, dimensional sketch or project specification can be provided for review.
How to Order Slip-On Flanges
For quotation, provide:
Size / NPS:
Pressure Class / PN Rating:
Material Grade:
Flange Type: Slip-On
Facing: RF / FF / RTJ
Bore / Pipe Schedule:
Standard:
Quantity:
Inspection Requirement:
Delivery Location:
For special requirements, provide the drawing or dimensional details.
Vandan Alloys – Slip-On Flange Manufacturer & Exporter
Vandan Alloys manufactures and supplies Slip-On Flanges for industrial piping, fabrication, engineering, process plants and international export requirements.
Our Slip-On Flange supply can cover:
Carbon Steel
Stainless Steel
Alloy Steel
Duplex
Super Duplex
Nickel Alloys
Other special materials
We support different sizes, pressure classes, standards, facing configurations and project-specific requirements.
Customers looking for a Slip-On Flange Manufacturer in India, A105N Slip-On Flange Supplier, Stainless Steel Slip-On Flange Manufacturer, ASME Slip-On Flange Supplier or Custom Slip-On Flange Exporter can contact Vandan Alloys with their complete specification.
Send your Slip-On Flange enquiry, drawing or specification to Vandan Alloys for quotation.
Vandan Alloys
Manufacturer of All Types of Flanges
3/5, Sakar Bhavan, Ground Floor, 6th Khetwadi lane, SVP Road ,Mumbai – 400 004. India
TEL+91 022 6610 9925Mobile no: 09892882255 GSTIN: 27AUMPS2067F1ZB
Email: info@vandanalloys.com ; Web: www.vandanalloys.com
Please visit Our Flanges Division:www.vandanalloys.net
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Vandan Alloys manufactures and exports Slip-On Flanges in A105, A105N, stainless steel, duplex and nickel alloys. ASME, EN and custom Slip-On Flanges in various sizes and classes.
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