1.Butt flange welding installation requires flange double-sided welding. Welded flanges are generally more commonly known as flange with nipple flange. Butt flanges for medium and high pressure pipe connections, butt welding flange is generally at least PN 2.5MPa, the use of butt welding is to reduce stress concentration.In addition, the welding flange mounting flange welding double-sided welding, Therefore, welding flange installation costs, labor costs and auxiliary materials costs to be higher, because more than one process.
2. Relative to butt welding flange, flat welding flange structure is simple, timber province, but the rigidity and tightness as with neck welded flange. Flat welding flange is widely used in medium and low pressure vessel and pipe connections. Flat welding flange for nominal pressure not exceeding 2.5MPa carbon steel pipe connection.Flat welding flange sealing surface can be made of smooth, bump and tongue and groove three kinds of smooth flat welding flange application Maximum. Used for medium conditions more moderate circumstances, such as low pressure non-purified compressed air, low pressure circulating water, which has the advantage of cheaper prices.(butt welding flange)