The EN 1092-1 Standard for a single series of flanges specifies requirements for circular steel flanges in PN designations PN 2,5 to PN 400 andnominal sizes from DN 10 to DN 4000. This European Standard specifies the flange typesand their facings, dimensions, tolerances, threading, bolt sizes, flange jointing face surface finish, marking, materials, pressure/ temperature ratings and approximate flange masses.

Threaded Tee is a type of pipe joint, which is the most common threaded pipe fitting, and is also an important accessory in pipeline systems. Threaded tee has three ports, one inlet and two outlets; or two inlets and one outlet, with a T and Y shape. Depending on the outlet diameter, there are two types of pipe fittings: TS equal tee and TR reducing tee. The outer diameter of the three ports of an equal diameter tee is the same, while the main pipe connecting pipe size of a different diameter tee is the same. While the connecting pipe size of the branch pipe is smaller than the connecting pipe size of the main pipe. Used at the confluence of three identical or different pipelines. The main function of the tee is to change the direction of the fluid and divert the flow of the medium through it.

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.