The location and sizing of air valves to ensure effective de-aeration of pipelines and to provide vacuum break capability was researched. Based on these findings. software was developed to evaluate gravity and pumping systems. A sound understanding of the factors affecting the hydraulic transportation of air in a pipeline is paramount for locating air valves. https://www.spidertattooz.com/SQB-PROTON-QUAD-M4-MAG-POUCH-INSERT-SMOKE-GREY/