Civil Engineering and Architecture 9(6): 2062-2076, 2021 http://www.hrpub.org DOI: 10.13189/cea.2021.090634 Multi-Nozzle Abrasive Water Jet for Oil and Gas Platforms Decommissioning: A Review Wesam Salah Alaloul 1 , Muhammad Ali Musarat 1,* , Lim Eu Shawn 1 , Ahmad Mahamad Al-Yacouby 1 , Iraj Toloue 1 , Waqas Rafiq 2 , Waqas Farooq 3 1 Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS, Malaysia 2 Department of Civil Engineering, COMSATS University Islamabad Wah Campus, Pakistan 3 Department of Electrical Engineering, Sarhad University of Science & Information Technology Peshawar, Pakistan Received July 7, 2021; Revised August 23, 2021; Accepted September 21, 2021 Cite This Paper in the following Citation Styles (a): [1] Wesam Salah Alaloul, Muhammad Ali Musarat, Lim Eu Shawn, Ahmad Mahamad Al-Yacouby, Iraj Toloue, Waqas Rafiq, Waqas Farooq, "Multi-Nozzle Abrasive Water Jet for Oil and Gas Platforms Decommissioning: A Review," Civil Engineering and Architecture, Vol. 9, No. 6, pp. 2062-2076, 2021. DOI: 10.13189/cea.2021.090634. (b): Wesam Salah Alaloul, Muhammad Ali Musarat, Lim Eu Shawn, Ahmad Mahamad Al-Yacouby, Iraj Toloue, Waqas Rafiq, Waqas Farooq (2021). Multi-Nozzle Abrasive Water Jet for Oil and Gas Platforms Decommissioning: A Review. Civil Engineering and Architecture, 9(6), 2062-2076. DOI: 10.13189/cea.2021.090634. Copyright©2021 by authors, all rights reserved. Authors agree that this article remains permanently open access under the terms of the Creative Commons Attribution License 4.0 International License Abstract Decommissioning offshore platforms present unique safety and health challenges to the oil and gas industry. In the Malaysian waters, there are over 300 fixed jacket platforms, and most of them exceeded the design service life of 25 to 30 years. One of the key challenges that determine the method of removal of aged jacket platforms is subsea cutting techniques. As underwater cutting is a challenging and expensive task, it is very much essential to develop cost-effective cutting techniques for decommissioning fixed jacket platforms. Thus, the objective of this paper is to present the state of art on Abrasive Water Jet (AWJ) cutting techniques by identifying the most significant parameters affecting the performance output measures for decommissioning of Jacket platforms applications. As the cutting process is very complex and times consuming tasks, the paper identifies research gaps and recommends new research areas in Multi Nozzles Abrasive Water Jet (MN-AWJ) for decommissioning applications. Many parameters are affecting the performance of AWJ that is why an in-depth critical review was adopted in this manuscript to determine the most significant parameters that need to be considered in the optimization of AWJ performance. Keywords Abrasive Waterjet Technology, Erosion, Machining Processes, Material Cutting, MN-AWJ 1. Introduction The power of water and its erosive effect has been serving the mankind for hundreds of years especially in the Roman Empire [1, 2]. The ancient Egyptians used sand combined with water for mining and cleaning. High-pressure water has been used for cutting in both forestry and mining. Abrasive waterjet is a manufacturing technique in which a high-pressure water stream mixed with hard particles removes material from a given object due to collision impact loads. This method is beneficial for processing hard or composite materials for engineering applications. The abrasive water jet system was applied for the first time in the United States. Modern industrial application of water jet technology was developed and get patented the concept of a high-pressure water jet cutting system in 1968 [3]. 1.1. Abrasive Water Jet Abrasive water jet (AWJ) is a processing method that has been used and widely adopted in the industry for cutting ductile materials such as aluminum, steel, alloys as well as brittle materials such as stone, concrete and ceramic [4, 5]. The AWJ machining techniques are also used in a variety of applications namely for milling, polishing, drilling, and turning [6]. Abrasive jet machining is a nontraditional machine process that operates without