ASME B16.5 Class150 Lap joint flange
ASME B16.5 Class150 Lap joint is which flange has a pressure of CLASS 150, according to the ASME stander. Lap joint flange, which is actually equivalent to the combination of two kinds of flanges, is to use flanging, steel ring and so on to cover the flange at the end of the pipe, flange can flange activities at the end of the pipe. The steel ring or flanging is the sealing surface, and the flange is used to compress them. This shows that the looper flange is not in contact with the medium because it is blocked by the steel ring or flanging. Flange is movable, which is not directly connected to the pipe, so it is called Lap joint flange. Common has the butt welded ring loose sleeve flange and the flat welded ring loose sleeve flange.
Because this flange can withstand the pressure is not high, so the general use and low pressure pipe. The purpose that USES loose sleeve flange is to save material commonly, its structure is divided into two parts, pipe part one end and pipe are connected, one end makes flanging, flange dish part is covered in flanging. Flanges are made of low grade material, while pipes are made of the same material as pipes to save material.
Advantages of ASME B16.5 Class150 Lap joint flange
1. Cost saving. When the pipe material is special and expensive, the cost of welding flange of the same material is high.
2. It is not convenient for welding or processing or requires high strength. Such as plastic pipe, glass pipe and so on.
3. Convenient for construction. If the flange bolt hole corresponding to the connection is not easy to find the correct or prevent the replacement of equipment flange bolt hole changes in the future.
Disadvantages of ASME B16.5 Class150 Lap joint flange
1. Pressure is generally medium or low pressure.
2. Low welding ring strength.
3. This kind of flange is not allowed for RT test.
Welding of ASME B16.5 Class150 Lap joint flange
1. The loose sleeve flange of the welding ring shall be detected by ultrasonic inspection without stratification defect.
2.should be cut into strips along the direction of steel rolling, bending butt welding into a ring, and make the surface of the steel ring cylinder. Steel plate shall not be directly machined into butt welding flange with neck.
3.Full penetration weld shall be adopted for butt weld of ring.
4. The butt weld of the ring shall undergo post-welding heat treatment and be subject to 100% X-ray or ultrasonic flaw detection.
Application of ASME B16.5 Class150 Lap joint flange
This flange is often used for medium temperature and pressure are not high and the medium nozzle corrosion is strong. Loose sleeve flange is generally used in combination with flanging nipple, that is, flange ring loose sleeve outside flanging nipple, pipe and flanging nipple butt welding connection, flange sealing surface processing in flanging nipple. In addition, there are flat welded ring and butt welded ring plate loose sleeve flange. Since the flange itself is not in contact with the medium, only flanging joints or welding rings are required to be consistent with the pipe material, the material of the flange body can be completely different from the pipe material, so it is especially suitable for the corrosive medium on the official road, can save valuable corrosion resistant materials such as stainless steel, nonferrous metal. In the water supply and drainage accessories, such as expansion joints on the most common, manufacturers factory expansion joints at both ends of a loose sleeve flange, directly connected with the project pipeline, equipment with bolts.
