Seamless Tube and Pipe manufacturing processes

Seamless Tube and Pipe

The main seamless tube manufacturing processes came into being toward the end of the nineteenth century. As patent and proprietary rights expired, the various parallel developments initially pursued became less distinct and their individual forming stages were merged into new processes. Today, the state of the art has developed to the point where preference is given to the following modern high-performance processes:

The continuous mandrel rolling process and the push bench process in the size range from approx. 21 to 178 mm outside diameter.

The multi-stand plug mill (MPM) with controlled (constrained) floating mandrel bar and the plug mill process in the size range from approx. 140 to 406 mm outside diameter.

The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.

Mandrel Mill Process

Mandrel mill process

In the Mandrel Mill Process, a solid round (billet) is used. It is heated in a rotary hearth heating furnace and then pierced by a piercer. The pierced billet or hollow shell is rolled by a mandrel mill to reduce the outside diameter and wall thickness which forms a multiple length mother tube. The mother tube is reheated and further reduced to specified dimensions by the stretch reducer. The tube is then cooled, cut, straightened and subjected to finishing and inspection processes befor shipment.

Types of pipe

1. Cast iron Pipe.

2. G.I Pipe.

3. Wrought Iron Pipe.

4. Steel Pipe.

5. Copper Pipe.

6. Plastic Pipe.

7. Asbestos Cement Pipe

8. Concrete Pipe.

9. Vitrified Clay Pipe.

In this article, we will cover all of the above piping types in details.

So, Let’s Start.

1. Cast Iron Pipe:

Cast Iron pipe is widely used for city water-distribution systems because of its high resistance to corrosion and consequent long life.

Cast iron pipe is made from pig iron. Such pipes are normally made from 5 cm to 120 cm in diameter.

Under normal conditions, a cast iron pipe can be expected to last 100 years.

The usual length of a pipe section is 12 ft, but lengths up to 20 ft can be obtained.

Cast iron pipe is made in several thickness classes for various pressures up to a maximum of 350 psi.

Cast-iron pipes are usually dipped in a bituminous compound for protection against corrosion and to improve their hydraulic qualities; larger sizes may be provided with a lining of cement mortar.

https://youtu.be/W85BIm9ON84

                     What is pipe?

Pipe:- pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow — liquids and gases (fluids), slurries, powders and masses of small solids. It can also be used for structural applications; hollow pipe is far stiffer per unit weight than solid members.

2. a hollow cylinder of metal, wood, or other material, used for the conveyance of water, gas, steam, petroleum, etc

3.In common usage the words pipe and tube are usually interchangeable, but in industry and engineering, the terms are uniquely defined. Depending on the applicable standard to which it is manufactured, pipe is generally specified by a nominal diameter with a constant outside diameter (OD) and a schedule that defines the thickness. Tube is most often specified by the OD and wall thickness, but may be specified by any two of OD, inside diameter (ID), and wall thickness. Pipe is generally manufactured to one of several international and national industrial standards.^[1] While similar standards exist for specific industry application tubing, tube is often made to custom sizes and a broader range of diameters and tolerances. Many industrial and government standards exist for the production of pipe and tubing. The term "tube" is also commonly applied to non-cylindrical sections, i.e., square or rectangular tubing. In general, "pipe" is the more common term in most of the world, whereas "tube" is more widely used in the United States.

Both "pipe" and "tube" imply a level of rigidity and permanence, whereas a hose (or hosepipe) is usually portable and flexible. Pipe assemblies are almost always constructed with the use of fittings such as elbows, tees, and so on, while tube may be formed or bent into custom configurations. For materials that are inflexible, cannot be formed, or where construction is governed by codes or standards, tube assemblies are also constructed with the use of tube fittings.

Shapes of pipe :-