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LAY-UP CONSTRUCTABILITY CHALLENGES IN CROSS COUNTRY GAS PIPELINES

Lay-up is a process that provides internal protection on equipment (pipeline, piping, heat exchanger...etc.) and controls internal corrosion by ensuring water and oxygen-free environments. Corrosion may occur and be accelerated by water contact after hydrostatic testing and even a small amount of stagnant water and oxygen ingress will cause bacteria to grow in water which may result in loss of thickness due to high concentration of sulfate-reducing bacteria (SRB) and accelerate internal corrosion in equipment due to Microbiological Induced Corrosion (MIC). Lay-up helps to greatly reduce these risks of internal corrosion and provide assurance of design life. The objective of this study is to identify constructability challenges faced during construction and carry out a lay-up in a cross country pipeline in gaseous services. Six challenges are discussed and explored in the study including: the long duration from water fill to final lay-up, pipeline segments are used as water reservoirs, intermediate/segment lay-up, failure to maintain lay-up, indefinite lay-up periods, and rainwater. A case scenario is used to demonstrate the extent of these challenges and issues. It is hoped that this study will help avoid and minimize these constructability challenges in future cross country gas pipelines projects.

Product Number: MPWT19-15299
Author: Mostafa A. Alabudib
Publication Date: 2019
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