Lap Joint Flange - China

Lap joint flanges have a beveled edge on their inside diameter and fit over a pipe.

They are most commonly used with a stub end, which is typically welded to the pipe, leaving the lap joint free to rotate around it.

Lap joint flanges are especially useful because they eliminate the possibility of issues with bolt hole alignment.

They are often used in applications that require frequent dismantling.

JSFITTINGS offers lap joint flanges in accordance with DIN EN 1092-1/02, ASME B16.5, and EN PN 10, available in both carbon steel and stainless steel.

What is a Lap Joint flange?

Lap Joint flanges are sometimes referred to by other names, including: Stub end flange

Loose flange

Backing flange

Vanstone and Backing Ring

Van Stone flanges.

A lap joint flange (LJF) is an assembly of two elements involving a stub end and a lap joint ring flange (also called a ‘lap joint flange’).

To be technically correct, the stub end is not part of a lap joint flange.

However, a lap joint flange is always used in conjunction with a stub end, so both parts are often collectively referred to as a ‘lap joint flange’.

Lap joint flanges are suitable for piping systems, allowing easy disassembly, while rolled angle rings are suitable for structural applications to create curved or rounded shapes within various structures.

Lap Joint flanges are very similar to Slip On flanges.

However, Lap Joint flanges include a radius at the intersection of the flange face that is made to accommodate the flared portion of the Stub End, making it only compatible with Stub Ends.

Materials for Lap Joint flanges and Lap Joint Stub Ends vary and may even differ in a single implementation to allow for greater cost flexibility.

Materials typically used for Lap Joint flanges include a range of stainless steel, carbon steel, and other alloy materials.

Lap Joint Flange ASME B16.5 Lap joint flanges are available in many sizes and classes; they are also suitable for elevated temperatures and pressures.

Generally, a lap joint flange can be used for the same applications as a welding neck flange.

These flanges are available in common dimensions like other flange types, making it easy to integrate them into existing piping systems or use them alongside other piping components.

Stub Ends also match both pipe material and wall schedule to maintain both inside and outside diameters of your piping process.

This style is typically used in engineered piping systems with critical wall thickness requirements.

The advantages of the lap joint flange design are:

1 - Inexpensive.

2 - Well-suited for corrosive applications.

3 - Requires only a single full penetration butt weld.

4 - Only the stub end has contact with the process medium 5 - It can be easily adjusted to align with the mating flange (the flange can be rotated until the bolt holes align).

6 - It is available in almost all pipe diameters.

7 - Ideal for systems where frequent disassembly of the flange is required, e.g., when cleaning or inspection is required.

There are some limitations on the lap joint flange’s usage, mostly due to its bulkier multiple-component design.

Lap joint flanges cannot be used for small-sized piping.

Company Contact:

• Posted By: HEBEI JINSHENG PIPE FITTING MANUFACTURING CO., LTD,

• Phone: 86-18032153916

• Address: Wuliyao Industry Zone, Yanshan County, , Cangzhou , Hebei , China

• Email:

• Website: https://jsfittings.com/

• Business Description: We are committed to providing quality products and services at competitive prices, including but not limited to steel pipe flange,buttweld elbow,butt weld tee,pipe Reducers and steel pipe .
  
  We have earned ISO9001: 2015, CE, GOST-R, and passed Pressure Equipment Directive (PED) certification.
  
  All this comes with exemplary customer service and a comprehensive warranty that guarantees your satisfaction.