90 Degree Elbow is the most common elbow in pipe installation and is a pipe fitting that changes the direction of the pipe in the pipe system. Butt welding elbows are welded by two steel plates. Generally, large-bore elbows are butt welding processes. Therefore, in industrial use, most elbows with diameters above 600 are basically butt welding elbows. According to the bending radius, butt weld 90 degree elbow can be divided into long radius (LR) elbow and short radius (SR) elbow. Other commonly used elbows in fluid pipeline engineering construction are 45 degree elbow and 180 degree elbow.

Swaged Nipple is a pipe fitting used for connecting two pipes of different sizes in a straight line to achieve pipe-diameter variation. It is divided into concentric and eccentric pitches. The center line of the two pipes connected by Concentric swaged nipple is in a straight line and is mainly used for vertical piping. Eccentric swaged nipple is more used in horizontal piping. In small diameter pipelines (below DN50), Swaged nipple is often used instead of joint with different diameter for pipe diameter reduction. Its connection form is different from that of butt welding and threading. It is mainly used in petrochemical, medical and health, electric power, aerospace, military, fire control, metallurgy, shipbuilding, gas, nuclear power, environmental protection, etc. departments and fields requiring high pressure and precise size. The standard of short diameter section refers to American Standard MSS SP-95. The production materials can be Carbon Steel, Alloy Steel, Stainless Steel, Du

ASTM A106 GrB. Seamless steel pipe belongs to U.S. standard steel pipe, A106 includes A106-A, A106-B, A106-C. Material A106 belongs to the ordinary carbon steel series, is one of the commonly used materials.

Spectacle Blind is a pipe fitting used to isolate or connect piping systems. The spectacle blind has a structure of half blind plate and half flange. It is often used for pipeline flanges requiring process change to facilitate pipeline maintenance. Usually use the space occupied by one end of flange to keep the pipeline unblocked. If necessary, replace it with blind plate of the same thickness at the other end to cut off the pipeline. Avoid forced expansion of pipeline caused by temporary replacement of other blind plates and affecting the whole system. Commonly used for pipe flanges requiring process change, mainly made of carbon steel, stainless steel, and alloys, which can be selected according to pipe pressure level and pipe media.

ASTM A234 WPB is one of the common carbon steel grade and used to manufacture ASME B16.9 butt weld pipe fittings, such as 90 Degree Elbow, 45 Degree Elbow​, Steel Pipe Bend, Tee, Cross, Conc Reducer, Ecc Reducer and Steel Pipe Cap

Butt Weld 90° Elbow is the most commonly used elbow in pipeline installation. It is a pipe fitting that changes the direction of the pipeline in the pipeline system. NACE is the National Association of Corrosion Engineer. NACE MR 0175 is the main material selection standard for equipment and pipelines upstream of H2S oil and gas fields. Including underground and ground facilities in oil and gas fields, this standard has been widely adopted and recognized by international oil companies and manufacturers.