The lap joint flange types are very important for production. Different production areas require different types of loose flanges.
Elite Piping Manufacture provides different types of lap joint flange.Lap joint flange flange, also known as loop flange, refers to a flange that is loosely sleeved on the flange of a container or pipe. It is often used in situations where the medium temperature and pressure are not high but the medium is highly corrosive.
Features Of Lap Joint Flange Types
The lap joint flange is loose. The flange can be made by flanging, directly turning it out or additionally welding the ring. The advantage is that no additional moment is generated on the container or pipe when the flange is deformed, making it easy to manufacture.
It can be made of different container or pipe materials, saving precious metals. The disadvantage is that the flange thickness is larger. Suitable for applications where containers or pipes are lined with brittle materials and the pressure is not high.
Due to the different lap joint flange types, the connection methods are also different. The connection between pipelines and valves is generally welded directly between the pipes and valves or flanges to achieve the purpose of sealing.
It is easy to loosen and leak, and there are gaps on the outside of the joint, which can easily cause pollution and cause corrosion. Contents of the Utility Model The purpose of the utility model is to provide a flanged connection flange that reduces gasket corrosion caused by contact between the seal and external air and improves sealing performance.
Different Lap Joint Flange Types
Lap joint flanges, commonly known as loop flanges, are divided into welded ring lap joint flanges, flanged lap joint flanges and butt welding lap joint flanges. They are mostly used on copper, aluminum and other non-ferrous metal and stainless steel pipes.The lap joint flange types are as follows.
Welded Ring Lap Joint Flange-One Of Lap Joint Flange Types
Assembly of welding ring loop flange and pipe. When assembling, first put the flange on the pipe, then put the welding ring on the pipe end and weld it with the pipe.
The welding methods and requirements for the welding ring and the pipe are basically the same as the welding methods and requirements for the flat welding flange and the pipe, but the position of the screw hole does not need to be considered.
When assembling the looper flange, attention should be paid: the flange must be placed on the pipe, and then flanged or welded, otherwise the flange will not be installed, resulting in waste of rework. The chamfered side of the inner hole of the flange must be pressed against the flange or the welding ring, and cannot be installed backwards; the sealing surface of the welding ring must face the outside of the pipe mouth, and cannot be installed backwards.
Flanged Lap Joint Flanges-One Of Lap Joint Flange Types
Assembly of flange loop flange and pipe. During assembly, the flange is first placed on the pipe, and then a flanging ring is welded to the end of the pipe, or flanging is performed directly on the pipe mouth.
The end face of the flange should be perpendicular to the center line of the pipe, the width of the flange should meet the requirements, and the surface should be smooth, straight, and free of wrinkles, cracks and other damage PVC pipe flanging.
When turning, use a medium of 130 to 140°C to heat the pipe end for 5 to 10 minutes to soften it, then expand it into a trumpet shape, then flatten it with a mold to flange it, and then cool it.
When flanging a copper pipe, the length of the flanging should be drawn on the flanging coin and annealed to soften the pipe end. Then put it on the flange and beat it evenly with the small head of a small hammer.
After placing it into a trumpet shape, the big head of the hammer is used to knock the bell’s mouth flat. To flange lead pipes, lead pipes are soft and can be flanged directly with an oak or birch hammer. The method is the same as the flanging method for copper pipes.
Butt Welding Lap Joint Flange-One Of Lap Joint Flange Types
The composition of the butt welding loop flange is that the flat welding flange and the butt welding nozzle are combined into a set. The shape of the butt welding nozzle is basically the same as the butt welding flange. The outer diameter is smaller than the butt welding flange and there are no bolt holes. The purpose is After matching, the butt welding nozzle is welded to the pipe and the flat welding flange can move freely within it.
The Connection Of The Lap Joint Flange
The connection of the lap joint flange is actually achieved by welding, but this flange is loosely sleeved on the accessory component that has been welded to the pipe, and then the accessory component and the gasket are pressed tightly through the connecting bolt to achieve sealing. The orchid (i.e. loose sleeve) itself does not contact the medium.
The advantages of this type of flange connection are that the flange can be rotated, easy to center the bolt holes, easy to install on large-diameter pipes, and also suitable for places where the pipes need to be frequently disassembled for cleaning and inspection. The material of its flange accessory components is consistent with the material of the pipe, but the material of the flange can be different from the material of the pipe (most flange materials are Q235, Q255 carbon steel), so it is more suitable for pipelines transporting corrosive media. However, loose sleeve flanges do not have high pressure resistance and are generally only suitable for the connection of low-pressure pipelines.
Lap Joint Flange Function
It is mainly connected to the equipment or flange, such as the flange connection on the valve or pump.
- Convenient installation. For example, if the equipment has not yet arrived at the site, but the pipelines have been installed and arranged in advance, then this loose flange is used. When the equipment arrives, it will not matter how you install it with the flange on the equipment, because the loose flange can be moved and there will be no problems such as mismatching the bolt holes.
- Convert the pipe material. For example, we can convert stainless steel pipes to carbon steel pipes, or we can convert stainless steel pipes to carbon steel. For example, in order to save costs or work conditions, stainless steel pipes need to be changed into carbon steel pipes. In this case, we will make the flange position stainless steel, and the butt welding or flat welding nipple or ring at the back will be made into carbon steel pipes. Material, this completes a perfect conversion. In many projects, this is done to save material costs or work conditions.
Lap joint flanges are widely used in chemical industry, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, electric power, aerospace, shipbuilding and other basic projects.
We put great emphasis on the lap joint flange types. If you have any questions about lap joint flange types , welcome to contact us.
