Flange in oil and industry is still very common, we can see the use of butt welding flange in various categories of industry. However, the use of welding flange is the need to have a lot of attention, these attention is the need to pay attention to. So, what are the basic precautions for welding flanges in use?

There are two types of butt welding flange specifications used in petroleum and chemical industry, one is the pressure vessel butt welding flange specifications, the other is the pipe butt welding flange specifications. Flat welding and butt welding flanges have two kinds with and without the lining ring. When the equipment is made of stainless steel, using carbon steel butt welding flange 7 and stainless steel lining ring, can save stainless steel.
It is necessary to know the nominal diameter and nominal pressure of butt flange when using butt flange specification to confirm butt flange size. Nominal diameter of butt welding flange of pressure vessel and nominal diameter of pressure vessel shall be the same series of values. For example, DN1000mm pressure vessel, should be matched with DN1000mm pressure vessel butt welding flange.