Company Details
Shijiazhuang Bang dong Pipeline Technology Co,Ltd.
There are various Pipe Fittings Manufacturing Process that used to manufactured Elbow, Tee, Reducers and other pipe fittings.
Fittings are manufactured from Seamless Pipe and from Welded Pipe with filler material (ERW & EFW pipes cannot be used to manufactured fittings). large diameter fittings are manufactured from Plate.
To manufactured wrought fitting various methods are used, these are the different type of Hot and cold forming process.
In cold Extrusion method, a pipe with the same diameter as finished product is pushed through a die and formed into its desired shape. Usually applied to stainless steel small to medium sizes elbows.
Extrusion MethodUO method is used to manufacture medium size of the elbow, tee, and reducers. The plate is cut out into a specially designed shape, it is formed first into a U-shape using a die and then into an O-shape or tubular form using another die, that is why this method is known as UO method. Once the fittings formed in tumbler shaped it is welded from inside and outside of the closing seam. A cut plate is 1st from in U shape and then in O shape.
UO MethodIn a Hot Forming Die Bending method, a Pipe is heated to forming temperature & formed in the die with the specific shape, this process may be repeated as needed to obtain the required shape, size and wall thickness. Usually applied to thick-wall items that cannot be bent on a mandrel die.
Hot Forming method for Elbow ManufacturingHydraulic Bulge method is used to manufacture Tee. Cut piece of Pipe is placed in hydraulic die and liquid is fill inside the pipe, Hydraulic pressure pushes out the branch, in the fixed opening in the die. This method gives the good surface finish. However, higher thickness Tee cannot be manufactured by this method.
Hydraulic Bulge Method for Tee ManufacturingTee with large diameters, heavy wall thickness and /or special material with challenging workability that cannot be manufactured using the hydraulic bulge method are manufactured using hot Extrusion Method. In hot Extrusion Method, Normally Bigger diameter pipe is used than the finished product size, the branch outlet is extruded from the pipe with help of extrusion tool. Other dimensions of body and branch can also be adjusted by pressing the die if required.
Most common method for manufacturing Reducers is Outer Die method. The pipe is cut and pressed in the outer die; compressing the one end of the pipe into a smaller size. This method is useful for manufacturing of small to medium size of reducers.
Outer Die MethodCAPS are manufactured by Deep Drawing method. In this method, Plate is cut out in a circle and formed by deep drawing die.
Deep Drawing MethodStub Ends or Lap Joints Flange are manufactured by flaring method. Pipe end is a flare or spared out to form flange face. Stub ends are also manufactured by forging in which forge block are machined to final dimension.
Hot finished pipe fittings do not require heat treatment, however, for Cold finished pipe fittings Heat treatment is required as per applicable ASTM standard.