Natural Gas Hydrates, 3rd Edition

Chapter 9

Phase Diagrams

Abstract

Phase diagrams are a tool that engineers can use to resolve problems, not only with hydrates but with other phases as well. To begin, this chapter presents some rules for constructing phase diagrams. Several specific examples are then presented and some interesting results are revealed. For example, using phase diagrams it is demonstrated that free-water is not required for hydrates to form. Another extreme case is also demonstrated – excess water can inhibit hydrate formation.

Keywords

Phase envelopes; Pressure-composition diagrams; Pressure-temperature diagrams

Phase diagrams are useful for both the theoretical discussion of gas hydrates and for engineering design. In this chapter, we will concentrate on fluid phase ...