Two solids which can form or deposit in gas transmission lines, gas hydrates and diamondoids, were investigated.

A high pressure apparatus has been designed which enables the rates of hydrate formation from ice to be determined under dynamic gas conditions. The rate of hydrate formation was found to increase with gas flow rate at gas temperatures slightly above the ice point, but this effect was diminished at lower temperatures.

Vapor pressure curves for two diamondoids, adamantane and diamantane, were determined between 25 C and 300 C. Solubilities of these diamondoids were also determined in various organic liquid solvents and dense CO2.

Analytical solutions to the rate of hydrate or diamondoid removal from pipelines containing significant hydrate or diamondoid deposits were also derived.

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