Difference between butt welding flanges with neck and neck fl
Jul 09, 2018
The neck butt welded flange is the same as the pipe to be welded, and the diameter and wall thickness of the interface end are welded like two pipes.
The neck butt welding flange production process mainly includes: Casting flange mainly includes free forging, die forging, rolling flange, cutting flange. The main application of neck butt welding flange: pipe connection. On the pipe to be connected, a variety of flange plates are installed. The low pressure pipe can use the wire connecting flange. The pressure of more than 4 kilos is used with the neck welding flange. The two flanges can be added with the sealing point and then fastened with the bolt.
Welding flange manufacturer, welding flange is not easy to be deformed, sealed and widely used, with the corresponding rigidity and elasticity requirements and reasonable butt welding to reduce the transition, the welding gap is large distance from the joint surface, the joint surface from the welding temperature deformation, it takes a more complex structure, suitable for large fluctuation of pressure or temperature. Pipelines or pipelines with high temperature, high pressure and low temperature are generally used for connecting pipes and valves larger than 2.5MPa, and are also used to transport expensive, flammable, explosive media on the pipeline.
Butt welding flanges are disc parts, which are common in piping engineering, and flanges are used in pairs. In pipeline engineering, flanges are mainly used for pipeline connection. In connection with pipes, all kinds of flanges are installed, low pressure pipes can be welded with flanges, and welding flange is more than 4 kg of pressure. Seal gaskets between the two flanges and fasten them with bolts. Flange with different pressure has different thickness and different bolts.
The neck butt welding flange is a concave table which is slightly larger than the outer diameter of the inner hole, and the pipe is welded inside.
Welding and butt welding of welding flanges with neck and neck is the welding method of flange and pipe connection. When welding flanges welding, only one side welding does not need the inner mouth of the welded pipe and flange. The welding and installation of the welding flange requires double side welding of flange. So flat welding flanges are generally used for low and medium pressure pipes. Welding flanges are used to connect to medium and high pressure pipes. The flanges are at least PN2.5MPa at least. Welding is used to reduce stress concentration. The common welding flanges are mostly neck flanges and high neck flanges. Therefore, the installation cost, labor cost and auxiliary material cost of welding flange should be high, because more than one process.
The neck butt welding flange can usually be divided into two forms: the wire flange and the welding flange. The so-called "wire connection" means the form of threaded connection. In the production practice, high pressure or low pressure large diameter flange generally adopts the welding method in the production practice, and the low pressure small diameter flange is mostly used in wire connection, if the two indexes can be distinguished according to the acceptable pressure and diameter size. In addition, the thickness of flange and the number and diameter of connecting bolts are also related to pressure.
