Question

A 0.7-gravity gas is at the 1200 psia and 100^oF. How far this gas can be expanded without hydrate formation

Answer 1

Solution:

Specific gravity of gas = 0.7

Initial pressure = 1200 psia = 8.274 MPa

Initial temperature = 100 = 311 K

The Permissible expansion of a 0.7-gravity natural gas without hydrate formation is [3.2 Mpa] which can be obtained from the figure (from Katz) below at the point (initial pressure = 8.27 MPa, Temperature curve = 311 K).

or [464.12 psia]

Permissible expansion of a 0.7-gravity natural gas without hydrate formation (from Katz). Katz, D.L. 1945. Prediction of Conditions for Hydrate Formation in Natural Gases. In Petroleum Development and Technology 1945, Vol. 160, SPE-945140-G, 140. New York: Transactions of the American Institute of Mining and Metallurgical Engineers, AIME