Rest secret factory direct long radius 45 degree elbow welding

Classification of welding elbow, according to its radius of curvature to points, 45 degree elbow 45 degrees elbow bend radius can be divided into long and short radius elbow. Long radius elbow refers to its radius of curvature is equal to 1.5 times the pipe diameter, namely R = 1.5D. Short radius elbow refers to its radius of curvature is equal to the pipe diameter, that is R = D. The formula for the bend diameter D, R is the radius of curvature. The most commonly used for 1.5D bend, if not specified in the contract is 1D or 1.5D, it is to optimize the choice of 1.5D. The most common implementation of standards GB / T12459-2005, GB / 13401-2005, GB / T10752-1995. Pressure classification if the press pressure rating points, about seventeen species, and the US standard pipe is the same, There are: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch 180 ° weld elbow 180 ° weld elbow 80, Sch100, Sch120, Sch140, Sch160, XXS, the most commonly used STD and XS are two kinds. According to the angle of bend points, 45 ° elbow with Elbow 90 ° and 180 ° elbow. As a kind of a lot of elbow, when ordering orders often take the following methods: such as "LR STD 90 ° 8", showing long radius, the pressure rating of STD, 90 ° 8 'elbow; another example, " SR XS 45 ° 4 "for short radius, pressure rating XS, 4 45 °" elbow. Above the elbow about classification. Tee, there are two. Three ports of equal diameter equal to the diameter of the three, the same diameter at both ends, but the bus terminal and the other two diametrically different diameters called reducing tees. Expressed as follows: For Tee, such as "T3" Tee said outside diameter of 3 inches Tee. For reducing tee, such as "T4 × 4 × 3.5" represents the same diameter of four inches diameter of 3.5 inches of reducing tees. Pressure rating and elbow pressure levels are the same, which is the same size range. The size of the head, but also the points system. Representation of the size of the head is the largest diameter multiplied by the small head diameter, such as "8 × 6" represents the bulk of the diameter is 8 inches, 6 inches in diameter small head size head. Welded carbon steel elbow Material division: ASTM / ASME A234 WPB, WPC alloys: ASTM / ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP911,15Mo3 15CrMoV, 35CrMoV stainless steel: ASTM / ASME A403 WP 304-304L-304H-304LN-304N ASTM / ASME A403 WP 316-316L-316H-316LN-316N-316Ti ASTM / ASME A403 WP 321-321H ASTM / ASME A403 WP 347-347H cold steel: ASTM / ASME A402 WPL3-WPL 6 High performance steel: ASTM / ASME A860 WPHY 42-46-52-60-65-70