..., a thermodynamic model for gas hydrate equilibrium conditions and cage occupancies of N 2 + CH 4 and N 2 + CO 4 gas mixtures at different compositions is proposed. The van der Waals-Platteeuw thermodynamic theory coupled with the Peng-Robinson equation of state and Langmuir adsorption model are employed...

... in a flexible pipe annulus. SSCC or HIC test according to Technip procedure based on NACE TM0177 and TM0284 standards % H2S in the gas mixture T°C and pressure Partial pressure H2S (mbar) H2S flowrate mL/min/cm2 of steel in the cell 10% Ambient 100 > 5 10-2 1% Ambient 10 > 5 10-3 0.1% Ambient 1 > 5 10-4 Table 1...

... conditions for the solid gas hydrate/free gas boundary of a phase diagram has been calculated for the measured hydrate gas mixtures in sea water; phase stability calculation methods are described in Sloan, 1990. The resulting hydrate stability conditions are described below and compared with the water column...

... was established. This program utilized the Brown & Root Inc. Dual Head Welding System, four types of pulsed power supplies, nine filler wires and five shielding gas mixtures. During the course of this program over forty girth welds were made with various combinations of power supply, filler wires...

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