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Presentation Overview. All Session times are CDT

Presentation 1 

Tuesday, May 4


PSIG 2108 - How to use pipeline models to manage nominations and allocations in a constrained and highly dynamic network

This paper investigates the technology and business benefits of a web-based model scheduling application, which integrates a transient model to other business applications that provide injection and demand schedules. The application provides a simple method to input complex scenarios, including compressor, regulator, and routing operations. The paper shows how the system allows non–modelers to use a complex transient model, reducing bad operational decisions which could impact the wholesale natural gas price or supply to end-user customers such as households or businesses. Other operational metrics are discussed.


G. Giannatos

Australian Energy Market Operator

John Fryatt

Head of DTC, DNV

Chris Davison

Principal Lead Consultant, DNV

Presentation 2 

Tuesday, May 4


PSIG 2106 - Regulator station risk model supported by a parametric study cloud application

Utilities delivering natural gas to residences and businesses at lower pressures are under increasing scrutiny from federal, state, and/or municipal regulators to demonstrate a commitment to safety. One way to do this is by using an analytical risk model to quantify the risk of the overall system and individual assets. Oftentimes the risk for pressure-reducing regulator stations is determined similarly as other types of assets in a gas network, and inputs may call for an engineer’s estimation. This paper describes the beginnings of a novel approach of applying hydraulic analyses via parametric study in the cloud to refine and enhance these analytical regulator station risk models.


Corey Rice

Principal Technical Support, DNV

Presentation 3 

Wednesday, May 5


PSIG 2114 - Surge phenomena in flexible hoses of offshore loading systems

Offshore loading systems provide products to tankers through flexible hoses. The flexible hoses can experience surges initiated by a valve closure. In this paper, surge studies are carried out for two common configurations of “tandem” and “buoy” loading systems. The results show much lower surge pressures in flexible hoses than those in carbon steel pipes due to the different elasticities of their material. The results also show that loading rates and valve closure time play a key role in potential-dominated surges which are the case for “tandem” configuration, whereas for line pack dominated operations in the “buoy” configuration, timely cutoff of the flow by closing a valve at the pipeline end manifold (PLEM) is imperative.


Guohua Li, Ph.D., P.E.

Principal Hydraulic Engineer, DNV

Hoorallah Tostamy

Hamid Bidus