Pipe Cutting and Bevelling in an efficient way

Introduction

 

We see a lot of piping in plants like Oil & Gas, Hydro Power, chemical industries for generating power or for transmitting fluid or offshore rig in oil and gas.

Onsite services like Pipe cutting and Pipe beveling play an important role in piping industry to make a continuous long pipe, to install valves between pipes, to install pressure gauges and other safety and measuring instruments, and during repair and maintenance work for operating efficiently and safely.

 

1. What is Pipe Cutting

Pipe cutting or pipe profiling are one of the onsite services that cut pipes to create a desired profile. Typical profiles include straight cuts and mitre cuts.



Factors involved in choosing a method or technology for cutting pipes are

  • The material
  • The wall thicknesses
  • squareness of ends
  • and requirements of end conditioning.

 

2. What is pipe Beveling?

When welding two pipes together, the ends of the pipe must be properly prepared to obtain the best weld joint. The pipe is typically bevelled on the ends to accommodate the joining of the two pieces by forming a “V’ between them. This is called pipe Bevelling.

This pipe bevelling can have different angles, forms, and other characteristics depending on the size of the pipe, wall thickness, material grade, and the method of welding. The angle is typically 37.5 degrees on one pipe and for welding the included angle would become 75 degrees. The popular and most preferred forms are bevel and J type.

 

3. Necessity of High precision pipe Cutting and pipe Beveling

 The benefits of using high precision and automated pipe cutting and pipe beveling tools are to save time, to achieve accuracy with consistency in final dimensions. Additionally, it avoids human error, reduces manpower involvement, and enhances job safety.

 

4. Which method of Pipe Cutting is preferred?

There are 2 methodsIt can be classified based on its holding type of the pipe – OD mounted and ID mounted. Portable pipe cutting and pipe beveling machines are available in several configurations. In portable machines, machine will be taken onsite for pipe cutting and pipe beveling. Generally, these are used in the field for either new construction or maintenance operations. These machined can be powered either electrically or pneumatically or with hydraulically.

Stationary pipe cutting and pipe beveling machines are exclusively designed for high production cutting and bevelling of pipes. In these machines, the pipe is moved to the machine for processing.

6. Pipe Cutting and Pipe bevelling Techniques of pipe cutting preferred depends on the environmental safety – Cold cutting or Hot cutting. Cold cutting is preferred in environments where hot cutting is not possible due to fire safety.

5. Classification of Pipe Cutting & Pipe Beveling Machines

Abrasive Cutting - Abrasive cutting is a manual method of cutting to length per specifications.

Advantages of Abrasive Cutting

·         Easy to use

·         Requires little or no setup time

·         quick

·         Inexpensive

Disadvantages of Abrasive Cutting

·         Cannot provide a Square cut

             ·         Not suitable for thick walled pipes

             ·         Needs additional process


Band Saw Cutting - Band saw cutting is a fully automatic process machine and the most common method for cutting pipes, and tubing.

Advantages of Abrasive Cutting

·         Suitable for high volumes


Disadvantages of Abrasive Cutting

·         Not efficient for cutting thin walled pipes.


·         Produces a burr


·         and does not achieve tight tolerances


 

Cold Cutting – A circular cold saw uses a wheel blade and cutting fluid, which usually is applied with a lubricator.

Advantages of cold Sawing

·         Suitable for cutting smaller diameter pipes


·         Suitable for Thin walled pipes that requires tight tolerances


·         Burr free cutting and beveling


·         Cut material with a length tolerance of ±0.004 in. and squareness tolerance of 0.002 in. per diameter inch.


·         Does not produce Heat zones 

Laser Cutting - A laser cutting machine is the best as a pipe cutting and pipe beveling machine tool. It can be operated by a programme for a variety of special requirements.

­­

Advantages of Laser Cutting

·         Minimal Heat zones


·         Cut hard materials accurately


·         Can work with hart materials like Titanium


·         Can use to cut difficult to reach areas

 

Disadvantages of Laser Cutting


·         High investment cost

 

Lathe cutting – It is ideally suitable for thin walled pipes for pipe cutting with producing square cut ends with minimum or no burrs.

Advantages of Lathe Cutting


·         High Production

 

Disadvantages of Latch cutting


·         Setup time

 

Shearing - A Pipe shear machine is an automatic machine with high speed and arranged with two shearing plates and two ID punches under extreme pressure to cut Pipes.

 

Advantages of Shearing

·         High Speed and Volume


·         No kerf loss

 


Disadvantages of Shearing

·         Not cost effective for small runs




Content Source :- ABS Group

 

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