The NextGen Pipeline Simulation Mobile app is a simplified client interface app that connects over a network to Gregg Engineering’s more comprehensive NextGen Pipeline Simulation Suite application running on a server. Gregg Engineering has been in business for over 26 years, and its pipeline simulation products are in use by over 80% of the natural gas interstate pipelines in the United States, as well as other large pipelines throughout the world. The server based NextGen Pipeline Simulation Suite lets users create virtual models of their pipelines and run hydraulic simulations used for both building new pipelines and operating existing ones. The NextGen Pipeline Simulation Mobile app is a simplified interface running on an iPad or iPhone that lets the user access his or her virtual models residing on the server, and control some of the more basic simulation functionality.