When modelling piping networks, especially in the presence of loops and parallel piping, HYSYS Dynamics can be easily used as a pressure-flow solver simulator (this was discussed in our article “Modelling Piping Networks – HYSYS Steady State, HYSYS Hydraulics or HYSYS Dynamics?”). However, one major flaw of using this methodology is that flow assurance calculations are not available in Dynamics.An erosion calculation is quite useful when modelling piping networks. This article suggests a methodology to correct this issue by setting up user variables in HYSYS and provides a step-by-step example including a sample of the required code.

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Introduction

The formation of hydrates in natural gas processing facilities and pipelines is a critical problem as it could lead to blocked pipelines and shutdowns and even to the destruction of valuable equipment. Because of these potential devastating and costly consequences, hydrate suppression methods are of great interest to operating companies. Injecting hydrate inhibitors such as methanol and Ethylene Glycol (EG) is one of the most common methods to suppress hydrate formation in the free water phase. These chemical additives thermodynamically destabilize hydrates and effectively lower the temperature of hydrate formation. For facilities, EG is generally the preferred choice as a hydrate inhibitor for continuous injection as it can be effectively regenerated and recycled.