A spherical tee is also known as a spherical elbow

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Spherical elbows are widely used in the ash transportation industry; they offer better wear resistance and do not get clogged with ash. The requirements for manufacturing spherical wear-resistant elbows are as follows: 1. The material for spherical elbows must be high-quality carbon steel; for export powder pipe elbows and spherical elbows, the material must be seamless steel tubes or steel balls. All spare parts are required to have a corundum ceramic lining, and PN16 flanges must be provided at both ends of the parts to facilitate the installation. The ceramic lining should be dense and have a smooth surface; there should be no grooves, bubbles, or separation between the wear-resistant layer and the steel pipe. The wear-resistant ceramic layer on the lining is uniform, offering good wear resistance; its average thickness is not less than 4 mm, its Mohs hardness is above 9.0, and the thickness of the metal wall is ≥8 mm. The strength of ceramic-lined composite steel pipes is not less than 1100 kg/m3; the density of the ceramic layer is not less than 3.85 g/cm2. The compressive shear strength is 15–20 MPa, while the compressive strength is 300–350 MPa. The outer surface of the spare parts is coated with an anti-rust treatment, in black color. 2. The length of the straight sections at both ends of the spherical elbow shall be no less than 400 mm; a short fitting along with an internal threaded plug for the DN40 assist air supply pipe is provided at the 180° direction of the outlet pipe. 3. The metal layer of all spare parts shall be coated with two layers of rust-proof primer and two layers of black topcoat, to ensure the integrity of the paint finish.