الفهرس 
Chapter 1 1. IntroductionOnly 14 pages are availabe for public view
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Abstract
The steel pipes industry is considered to be one of the most important strategic industries since it is essential for several projects in a variety of fields especially in the infrastructure, constructions, and oil and gas industry. This industry, like many others throughout the world, follows a sustainability approach, which is fast becoming an essential element of corporate success and influencing the market environment for manufacturers to acquire a competitive edge. Waste management is one of the aspects of achieving sustainability since it is only possible to put sustainability into reality if the waste can generate a profit while the consumables of this industry are expensive. Correctly separating and processing waste will substantially help to address the waste issue and generate profit as it has a negative impact on the environment and financially because it represents a loss of resources.
In this Thesis, the Lean Six Sigma methodology was used to find a solution to the problem of the produced waste during and after the production of longitudinally submerged welded pipes in the only company for this type of pipe in Egypt. As a (Define, Measure, Analyze, Improve, and Measure) DMAIC project was done through it, the previous system before improvement was studied, the problem was defined, and it was measured according to metrics that were determined, the root causes of the problem were analyzed, then improved, and worked on controlling and monitoring the results and practices.
After the practical application in the case company on projects, the usage of Lean Six Sigma methodology in this industry to optimize waste has proven positive results from a financial and environmental perspective and in terms of the amount of waste produced, as the amount of waste produced was reduced from 5.3% to 3.4%, furthermore, the financial loss as a result of the production of this waste was reduced by 58.07% of the percentage of the total loss from the old practices before the implementation of the improvement, moreover, as for the area used to store waste, it shrank from 10 square kilometers to 2.56 square kilometers.