flange type

Our company provides Pipe Flanges.

We provide flange products of various standards such as American standards, European standards, German standards, and Japanese standards. The list of common standards is as follows:

  • ASME B16.47 Flange  Class 150-900 Series A – 26″to 60″
  • ASME B16.47 Flange  Class 75-900 Series B – 26″to 60″
  • ASME/ANSI B16.5 Flange  Class 150-2500 – 1/2″to 24″
Various types of flanges
seller

lewis Liu

sales Manager

Types of Flanges

The most used flange types are Welding Neck, Slip On, Socket Weld, Lap Joint, Threaded, and Blind flange. We usually consider two main families of flanges, the standard flanges, and the special ones.

Flanges are used to connect pipes, valves, pumps, and other equipment in various industrial applications. There are several types of flanges available, including:

here’s a table presenting common flange types along with their descriptions:

Flange TypeDescription
Weld Neck Flange (WN)Characteristics: Weld Neck Flange has a protruding neck, the outer diameter of the neck is slightly larger than the diameter of the pipe.
Connection: Weld Neck Flange is usually connected to the pipeline by butt welding, i.e., the neck and pipe and end are welded, and this connection is relatively strong.
Standard: ASME B16.5, ASME B16.47, ASME B16.48, API 605, DIN 2543, BS 4504, JIS B 2212, GB/T 9119 and so on.
Application: Weld Neck Flange is mainly used in petroleum, chemical, natural gas, electric power and other industries with nominal pressure between 0.25-4MPa, where high pressure and high temperature require high sealing.
Slip-On Flange (SO)Characteristics: The flange of Slip-On Flange is the same or slightly larger than the diameter of the pipeline, and is sealed by gaskets and bolts, which is easy to install and dismantle.
Connection: The Slip-On Flange is connected to the pipe by placing a gasket and bolting to achieve sealing instead of welding.Connection: The Slip-On Flange is connected to the pipe by placing a gasket and bolting to achieve sealing instead of welding.
Standard: ASME B16.5, ASME B16.47, ASME B16.48, API 605, DIN 2543, BS 4504, JIS B 2212, GB/T 9119 and so on.
Application: Slip-On Flange is mostly used in places where the nominal pressure is generally lower than 2.5MPa and the temperature requirement is not high, such as water supply and drainage.
Blind Flange (BL)Characteristics: Blind Flange has no center hole or opening for connecting pipes, only a flat cover.
Connection: Blind Flange is connected to the adjacent flange by bolts.
Standard: ASME B16.5, ASME B16.47, ASME B16.48, API 605, etc.
Application: The Blind Flange is used for pipe termination, or for pipe maintenance, overhaul, pressure testing, and temporary connections to cut off the pipe to prevent leakage.
Socket Weld Flange (SW)Characteristics: Socket Weld Flange has a large difference between ID and OD, and the flange is connected to the pipe with a tab to prevent movement during use.
Connection: Socket Weld Flange is welded to steel pipe at one end and bolted at the other end.
Standard: ANSI B16.5, HG20619-1997, GB/T9117.1-2000-GB/T9117.4-2000, HG20597-1997 and so on.
Application: Socket welding flanges are mostly used in pipelines with nominal pressure less than or equal to 10.0MPa and nominal diameter less than or equal to 40mm.
Threaded Flange (TH)Characteristics: flange bore with thread.
Connection: realized by threads, the inner hole threads and pipe threads are used in conjunction to realize the connection.
Standard: AMSE, ANSI, BSW, DIN, JIS, GB, etc.
Application: Low pressure pipes where welding is not convenient.
Lap Joint Flange (LJ)Characteristics: Lap Joint Flange is easy to install and dismantle, convenient for maintenance and inspection.
Connection: Two flanges with gasket between them are connected together by lap joint and then bolted.
Standard: ASME B16.50
Application: low pressure non-hazardous low pressure water and ventilation piping, or temporary connections that require easy disassembly.
common flange types

This table provides a clear overview of common flange types and their respective characteristics.

Click the picture below and you can view the corresponding parameter details table of different types of flanges.

Flange

Industrial Steel Pipe Flanges

Made in China flange, lower price, better quality!

Weld Neck Flange

Weld Neck Flange

Socket Weld Flanges

Socket Weld Flanges

Slip-On Flanges

Slip-On Flanges

Threaded Flanges

Threaded Flanges

Blind Flanges

Blind Flanges

Lap Joint Flanges

Lap Joint Flanges

What are the types of flanges?

What are the types of flanges?

A flange is a pipeline connection accessory, it can be retired by welding bolts gaskets, etc. to the two pipelines connected and achieve the effect of sealing.

Common types of flanges include Weld Neck Flange (WN), Slip-On Flange (SO), Blind Flange (BL), Socket Weld Flange (SW), Threaded Flange (TH), Lap Joint Flange (LJ), and so on.

The sealing forms of flanges are mainly full plane, convex, concave-convex surface, tongue and groove surface, O-ring surface, and ring connection surface, and other six kinds.

When selecting flanges, it is necessary to consider a variety of factors such as the medium in the pipeline, pipe diameter, pressure level, medium temperature, project budget, etc.

The main role of the flange is to connect the pipeline and guarantee the sealing effect, as well as easy disassembly and maintenance.

Appearance and connection methods are different, the appearance of the flat flange is a flat disk, the butt welding flange protrudes from the center, the connection method of butt welding flange is connected by welding, and the flat flange is connected by bolts.

Blind flanges are generally used at the end of the pipeline as a seal to prevent leakage, and can also be used for testing, maintenance, pressure measurement, and other temporary closed places.

The flange connection is mainly sealed by clamping an asbestos or rubber gasket between two flanges and then pressing it.