Pipe Bends

PETROSADID offer the assured quality of Stainless Steel and Carbon Steel Pipe Bends in the industry. These materials are supplied in conformation to the national and international standard to fulfill your needs.

A pipe bend is the generic term for what is called in piping as an “offset” — a change in direction of the piping. A bend is usually meant to mean nothing more than that there is a “bend” — a change in direction of the piping (usually for some specific reason) — but it lacks specific, engineering definition as to direction and degree. Bends are usually custom-made (using a bending machine) on site and suited for a specific need.

Pipe bends typically have a minimum bending radius of 1.5 times pipe radius (R). If this bending radius is less than 1.5R, it is called Elbow. Reference to any international / industry standard need to be traced. 1.5, 3 and 4.5 R are the most common bending radii in industry. A pipe bend typically flows smoother since there are not irregular surfaces on the inside of the pipe, nor does the fluid have to change direction abruptly.

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Generally Pipe bends can be manufactured from seamless or welded pipes, but the choice is made taking into consideration the technical challenges involved. Increasing number of customers in the industry are choosing pipe bends as a preferred option for modern piping systems, as good quality pipe bends significantly reduce the need for welding and use of pipe fittings. Use of bends in piping systems also improves the flow of fluids in the piping system.

We Would Like To Introduce Ourselves as the reputed supplier of Long Radius Bend, Piggable Bend, Hot Bend, Hot Induction Bend, U Bend, J Bend, and Customized Bend in IRAN.

We can offer Pipe Bends in a variety of materials and wide range of radius and diameter as per project specification.

Hot Induction Bends

Long Radius Bend

Piggable Bend

Manufacturing Process

The production of high-quality bends depends on the manufacturing process of the steel pipe that is transformed into the bend.

Obtaining the most suitable chemical composition is also important as this enables the recovery of the pipe’s material properties following the bending process. Depending on pipe dimensions, grades and final bending conditions, alloying elements can be added to the steel in order to guarantee the required hardness and mechanical properties and to ensure that the bend’s chemistry matches as much as possible the line pipe’s chemistry.

Heat treatment is carried out on each bend in order to achieve the required mechanical properties after bending. For critical applications, such as high-strength steel, heavy wall, sour service or low-temperature, we also perform full quenching and tempering after bending, as a preferred process.

Machining of the bend ends guarantees optimum tolerances of inside diameters, as we ensure the bend has at least the minimum working tolerances of the mother pipe.

Pipe bending techniques are varied and offer different advantages and disadvantages depending on the function of the bend and the type of material being bent. Some use mechanical force and some use heat treatment, the most common are as follows:

Press Bending

Press bending is the simplest and cheapest method of bending cold pipe and tube. The pipe or tube is restrained at two eternal points and a ram in the shape of the bend advances on the central axis and deforms the pipe.

The bent pipe or tube is prone to deformation on both the inside and outside curvature. The pipe or tube is often deformed into an oval shape depending on the wall thickness of the material. This process is used where a consistent cross section of the pipe is not required.

Rotary Draw Bending

This is the most commonly used style of bender for bending pipe and tube where maintaining a good finish and constant diameter is important.

Rotary draw benders (RDB) are precise in that they bend using tooling or "die sets" which have a constant center line radius (CLR). The die set consists of two parts: The bend die creates the shape to which the material will be bent. The pressure die does the work of pushing the straight material into the bend die while traveling the length of the bend. Often a positioning index table (IDX) is attached to the bender allowing the operator to reproduce complex bends which can have multiple bends and differing planes.

3-Roll Bending

3-roll bending is also used for producing work pieces with large bending radii. The method is similar to the ram bending method, but the working cylinder and the two stationary counter-rollers rotate, thus forming the bend. Normally there are 2 fixed rollers and one moving roller and the work piece is passed forward and backward through the rollers while gradually moving the working roller closer to the counter rollers which changes the bend radius in the pipe.

This method of bending causes very little deformation in the cross section of the pipe and is suited to producing coils of pipe as well as long sweeping bends like those used in powder transfer systems where large radii bends are required.

Heat Induction Bending

In the case of heat induction, a coil is placed around the pipe. The coil heats a section of the pipe to a temperature between 430 and 1,200 °C. The temperature depends on the material. The pipe passes through the coil at a gradual rate while a bending force is mechanically applied to the pipe. The pipe is then quenched with either air or water spray. The products thus obtained are generally of high quality, but cost significantly more to produce.

Sand Packing Hot-Slab Bending

In the sand packing process the pipe is filled with fine sand and the ends are capped. The pipe is then heated in a furnace to 870 C or higher. The pipe is then placed on a slab with pins set in it. The pipe is then bent around the pins using a winch, crane, or some other mechanical force. The sand in the pipe minimizes distortion in the pipe cross section. It is an old process but one that hasn’t really been improved on for its flexibility when it comes to unique applications, and so is still in common use.