Pipe Fittings Manufacturing Process

There are various Pipe  Manufacturing Process that used to manufactured Elbow, , Reducers and other pipe .
Fittings are manufactured from Seamless Pipe and from Welded Pipe with filler  (ERW & EFW  cannot be used to manufactured fittings). large diameter fittings are manufactured from Plate.
To manufactured wrought  various methods are used, these are the different type of Hot and cold forming process.
These methods are
  • Hot forming or Extrusion Method
  • Hydraulic Bulge method – Cold forming
  • UO or Single weld seam Method
  • Monaka or Double weld seam Method
  • Deep Drawing Method for caps
  • Flare Method for  ends

ELBOWS Manufacturing Process:

Mandrel method (Hot Forming)
  • One of the most common Pipe Fittings Manufacturing Process for manufacturing Elbows from the pipe is mandrel method which is kind of hot forming methods.
  • In this method, the pipe is cut in pieces and push with the help of hydraulic ram. Induction heating coil heats the pipe and, it is pushed over a die called “mandrel” which allows the pipe to expand and bend simultaneously.
  • This method can be used to manufacture a wide range of the diameter of elbows
ELBOWS Mandrel method
ELBOWS Mandrel method
Extrusion Method
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 Method
Extrusion Method
UO Method
UO 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 Method
UO Method
Hot Forming Method
In a Hot Forming Die  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 Manufacturing
Hot Forming method for Elbow Manufacturing


TEE Manufacturing Process:

Hydraulic Bulge Method
Hydraulic 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 Manufacturing
Hydraulic Bulge Method for Tee Manufacturing
Hot Extrusion Method
Tee 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.

Reducer Manufacturing Process:

Outer Die Method
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 Method
Outer Die Method

Cap Manufacturing Process:

Deep Drawing Method
CAPS are manufactured by Deep Drawing method. In this method, Plate is cut out in a circle and formed by deep drawing die.
Deep Drawing Method
Deep Drawing Method

Stubend Manufacturing Process:

Flaring Method
Stub 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.
Fitting Heat Treatment
Hot finished pipe fittings do not require heat treatment, however, for Cold finished pipe fittings Heat treatment is required as per applicable  standard.
Common Heat Treatment for Fittings are
  • Normalizing
  • Quenching
  • Tempering
  • Solution Annealing
  • Stress relieving
  • And Combination of above

Seamless steel pipe >>

Seamless steel pipe >>
Seamless steel pipe is alos called CDS pipes (Cold drawn seamless pipe).

Pipe fitting >>

Pipe fitting >>
Pipe fitting is work that involves the installation or repair of pipes or tubes. Pipes and tubes are necessary for a wide range of reasons.

Flanges General >>

Flanges General >>
A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system.

Get in Touch

Welcome to Sunny Steel Enterprise Ltd.

Sunny Steel provide a wide range of steel products as Steel pipes, Seamless tube and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.

You can get in touch by telephone, post, online or E-mail.
Please check the help section first to see if your question may be answered there.