Elbow manufacturers introduce the basic knowledge

Basic knowledge of elbow pipe fittings  

Elbow manufacturers introduce the basic knowledge of the factors  

Elbow pipe fittings in the pipe system play the role of changing direction, changing elevation or changing diameter, sealing pipe end and leading branch pipe from the main;  In petrochemical installations, there are many kinds of pipes, complex pipe systems, different shapes, simple and diverse, and the variety, material and quantity of pipe fittings used are many, and the factors to be considered are also complex.  

Pipe fittings can be divided into butt welding fittings (referred to as butt welding fittings), socket welding fittings (referred to as socket welding fittings), threaded fittings (referred to as threaded fittings), flanged fittings and other fittings according to the end connection form of pipe fittings.  

In the design of pressure pipeline, the commonly used forms of butt welding pipe fittings, branch pipe bench, socket welding and threaded connection pipe fittings;  Flanged pipe fittings are mostly used in special occasions, and the range and quantity of use are relatively few.  

Butt welding elbow pipe fittings: common butt welding pipe fittings include elbow, tee, reducing pipe (size head) and pipe cap. The first three are mostly made of seamless steel pipe or welded steel pipe by pushing, drawing and extrusion, while the latter is mostly made of steel plate stamping;  

They achieve the same strength as the pipe through the nominal wall thickness class (pipe table number or wall thickness value), as for its local stress concentration reinforcement, is a matter for the manufacturer to solve;  The manufacturer shall design the strength of the butt welded pipe fittings and verify it by verification test method;  1.1 bend (here)  

Long Radius Elbow (R = 1.5DN): Generally preferred;  

Short Radius Elbow (R = 1.0DN): Used for sizing constrained applications;  Its high working pressure should not exceed 0.8 times of the long radius elbow of the same specification;  

Bend (Bend)(R = nDN): used to ease the media at the Bend scour and kinetic energy, available to R=3DN, 6DN, 10DN, 20DN according to the manufacturing method is divided into push elbow, extrusion elbow and welding oblique elbow  

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