Example Problem for Two-Sided Dissociation

An sll hydrate blockage occurs in an 18-in. diameter insulated pipeline. The seabed temperature is known to be 41°F. The heat transfer coefficient is known to be 4 Btu/h ft2oF. The default values for the hydrate dissociation temperature and plug porosity will be used. 

What is the time required to fully dissociate (hydrate and ice phases dissociated) 

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Inputting the values into the respective text boxes, and clicking the Calculate button, gives the result for 2SD. The calculation can be stopped if it is taking too long. The results are shown in the output boxes labeled Time for Hydrate Dissociation and Time for Complete Dissociation (hydrate and ice). The phases present are W-H-I as well as the vapor phase, but only W-H-I phase should be listed  

The presence of insulation slows the dissociation as it reduces heat transfer from the sea to the plug. To calculate without a heat transfer coefficient, enter a into the input box. 

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