Slip-On Flanges

Made in China Slip-On Flanges. We can produce flanges to ASME standards, as well as flanges that meet other standards. You can also provide drawings and let us produce custom flange products.

China Slip-On Flanges

We provide flange products of various standards, such as ASME/ANSI B16.47, EN standards, etc. We also provide customized Slip-On Flanges products.

As a company with 25 years of flange production experience, we support all types of flanges, and we can give you the best product quality, the most reasonable price.

Luis Liu

lewis Liu

Sales Manager

flange standard
slip-on flanges

What is Slip-On Flanges

Slip-on flange is a pipe connection fitting and a type of random flange. ‌It is connected to the container or pipe through a fillet weld and is designed to be either integral or loose flange. The flange rings of slip-on flanges are of two types: with neck and without neck.

Compared with necked butt-weld flanges, slip-on flanges have a simpler structure and use less material, but their rigidity and sealing are slightly inferior to necked butt-weld flanges.

Slip-on flanges are widely used in the connection of medium- and low-pressure containers and pipelines.

Slip-On Flanges Product Image Gallery

Here are various Slip-On Flanges produced by YANHAO. You can click on the pictures to enlarge them. As a company with 25 years of flange production experience, YANHAO supports all types of flange production.

Standardized Slip-On Flanges

  • Slip-On Flanges are commonly standardized as ASME B16.5, with sizes ranging from 1/2 inch to 60 inches.
  • Sealing surface types include raised face (RF), flat face (FF), dimpled face (MFM), tongue and groove (TG), ring joint (RJ), and so on.
  • Applicable pressure classes include Class 150, 300, 400, 600, 900, 1500.
ASME B16.5 Slip-On Flanges
Class 150Class 600
Class 300Class 900
Class 400Class 1500

Customized Slip-On Flanges

The following options are for you to customize. If you don’t have a design drawing, you can also consult our engineers and let us help you draw it.

size

Specified pipeline size, including flange ID and OD, thickness, bolt hole diameter, bolt hole distance, etc.

Material

Using specified material suitable for pipeline engineering according to your requirements.

Shape

can be customized with irregular flanges such as square flanges, and conical flanges, etc.

Connection

Threaded connection, welding connection, socket welding connection, etc., which can be selected.

Special Treatment

Special treatments such as surface coatings, anti-corrosion can be made according to your needs.

The customization process for flanges is generally as follows:

1

requirements
Confirmation

Communicate in detail to determine the requirements for flange size, material, pressure, connection method, etc.

2

Design drawings

Our professional engineers will design flange drawings for you. The drawings will specify the size, shape, thickness, etc. of the flange in detail.

3

Choose materials

Select suitable flange materials according to the requirements of the engineering project.

4

Customer confirmation

Send detailed information such as the designed drawings and materials to the customer for confirmation.

5

Processing sample

To ensure accuracy, first produce a sample according to the drawings and selected materials and send it to the customer for trial confirmation.

6

Production of bulk goods

After confirming the accuracy of the samples, proceed with mass production.

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About YANHAO

Aerial view of YANHAO Factory
Aerial view of YANHAO Factory

YANHAO is a flange manufacturer located in Hebei Province, China. It is one of the few professional flange suppliers in China.

We have many years of experience in flange production and have multiple flange production lines. We have sufficient stock of raw materials, rich inventory, fast delivery, and can ship within three days. At the same time, the price is affordable. You are welcome to consult and purchase!

In addition, we can provide a variety of bespoke flanges and pipe fittings. Customers can give drawings or samples, and our company will produce them to fit your specific requirements.

Learn more about YANHAO >>

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specifications & characteristics of Slip-On Flanges

This table provides a comprehensive overview of Slip-On Flanges, covering key specifications, characteristics, and additional considerations. Specific details and requirements may vary based on the chosen flange size, pressure rating, and material.

Specification/FeatureDescription
StandardASME/ANSI B16.5 Slip-On Flange.
TypeSlip-On Flange – A type of flange with a slightly larger bore than the pipe, which slips over the pipe end and is then welded to provide a secure connection.
Pressure RatingsAvailable in different pressure classes, such as 150, 300, 600, 900, 1500, 2500, etc., to accommodate varying pressure requirements.
Size RangeTypically available in sizes ranging from 1/2 inches to 48 inches or larger, suitable for various pipe and equipment sizes.
MaterialsASME/ANSI B16.5 Slip-On Flanges can be manufactured from materials like carbon steel, stainless steel, alloy steel, and more, chosen based on application requirements.
Facing TypesCommon facing types include Raised Face (RF), Flat Face (FF), Ring-Type Joint (RTJ), and Male and Female (M&F) facings, impacting sealing methods.
Bolt Hole Quantity and DiameterThe number and diameter of bolt holes vary with flange size and pressure rating, facilitating flange connection.
Connection MethodASME/ANSI B16.5 Slip-On Flanges are slipped over the pipe end and then welded to the pipe, providing a secure and leak-resistant connection.
Application AreasSlip-On Flanges are widely used in industries such as oil and gas, petrochemical, water treatment, and more for connecting pipes to flat-end equipment or vessels.
Standards and CodesASME/ANSI B16.5 Slip-On Flanges adhere to standards set by the American National Standards Institute (ANSI) and nominal pipe size (NPS) standards, such as ANSI B16.5.
Seal TypesSlip-On Flanges commonly use gaskets or O-rings for sealing, with the choice of seal type depending on the application and pressure rating.
Accessories and AttachmentsSome applications may require additional components such as flange gaskets, bolts, nuts, flange covers, or flange cover gaskets.
Inspection and TestingASME/ANSI B16.5 Slip-On Flanges typically undergo a series of inspections and tests to ensure they meet quality and performance requirements, in compliance with standards.
Marking and CertificationSlip-On Flanges should be marked with the manufacturer’s identification, size, class, material, and other relevant information. Some flanges may require specific certifications such as PED or ASME.
Installation and MaintenanceProper installation and regular maintenance of Slip-On Flanges, including weld integrity, bolt torque, flange face cleaning, and lubrication, are crucial for system integrity and performance.
Application StandardsIn specific industries and applications, there may be industry-specific Slip-On Flange application standards that need to be adhered to for safety and performance.
Slip-On Flanges Main Features and Specifications Table

FAQs About Slip-On Flange

The slip-on flange (S/O flange) manufactured in accordance with ASME B16. 5 is a loose-type flange that has no direct connection to the adjoining pipe wall or the nozzle neck, or the vessel. It has a low hub that allows the flange to slip onto the pipe prior to welding.

slip-on flanges are mainly used for fluids at low pressure or with little risk of leakage. It is very common to find these flanges today in cooling water lines, firefighting water lines, low-pressure compressed air lines, and process lines for substances such as steam, oil, gas, condensates, etc.

Slip on Flange is essentially a ring that is placed over the pipe end, with the flange face extending from the end of the pipe by enough distance to apply a weld bead on the inside diameter. The OD of slip-on flange is also welded on the back side of the flange.

B16. 5 is limited to flanges and flanged fittings made from cast or forged materials, and blind flanges and certain reducing flanges made from cast, forged, or plate materials. Also included in this Standard are requirements and recommendations regarding flange bolting, flange gaskets, and flange joints.

The American Society of Mechanical Engineers (ASME) and American National Standards Institute (ANSI) are important organizations in the flange industry. Each of them plays an integral role in developing the standards and codes that govern the industry.

The Weld Neck Flange offers increased strength under higher pressures, subzero or elevated temperatures that cause line expansion or retraction or other variable forces. The Slip On Flange is connected to the pipe by two welds, one on the back side of the Flange and one on the inside of the Flange.