Lap Joint Flange

Lap Joint Flange

Lap Joint Flange Product Introduction. A lap joint flange is very similar to a slip-on flange, with the main difference being that it has a curved radius at the bore and face to house a lap joint stub-end. Lap joint flanges and stub-end assemblies are typically used in situations where frequent...

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Product Details

Lap Joint Flange

Product Introduction.


A lap joint flange is very similar to a slip-on flange, with the main difference being that it has a curved radius at the bore and face to house a lap joint stub-end. Lap joint flanges and stub-end assemblies are typically used in situations where frequent dismantling is required for for inspection. The lap joint flange itself is not welded or fixed in any way. It is free to spin for proper alignment with what ever it is joining to.


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Specification

Standard

ANSI B16.5, ASME B16.47, JIS B2220

Steel Grade

Q235-A CL150, 20#, A105, 12 Cr1MoV, 16MnR, 15CrMo, TP304, TP304L, TP316, TP316L

Size Range

 1/2”—78”

Notes

 



Description:

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A lap joint flange (Loose flange) is a device which consist of two pieces, it looks like a weld neck flange together, and it is butt welded with the pipes, it also like a loose slip-on flange.  


First piece of the lap joint flange is a sleeve called a ‘Stub-end” and is shaped like a short piece of pipe with a narrow shoulder on one end and a butt weld end on the other end which called the hub. The narrow shoulder dimensions is like the rase face of the flange, the butt weld end of the stub-end is like the neck of the weld neck flange, the diameter and thickness is according to the pipe for connection.  The back face of the hub has a rounded transition that joins the hub to the sleeve. 


The other piece of a lap joint flange is the backing flange. Backing flange dimensions are same with other common flanges (O.D. ,PCD, Bolt hole, etc.) , however it does not have a raised face (the stub end has the raised face ).On One side of the lap joint flange, the backside, has a slight shoulder that is square cut at the center or pipe hole. The front side has flat face and at the center hole an outside fillet to match the fillet of the “Stub-end” piece. The flange part of the Lap-joint flange assembly is slipped on to the stub-end prior to the sleeve being welded to the pipe or fitting for connection. The flange itself is not welded or fixed in any way. It is free to spin for proper alignment with what ever it is joining to.  


The lap joint flanges are used a lot in the low pressure piping systems ,haihao flange factory can produce the lap joint flanges as per request , help clients to reduce the cost and solve the application problems.


Edit by Ms Saadiya Jiang of KRM/BSW

Contact us directly by:  

Email: saadiya@kingruimansteelpipe.com  

Tel / Whatsapp: +86-15203177981

Skype: xytsaadiya


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