Effect of solids on relief sizing equations

If it is decided that the relief sizing equations are valid, then the liquid physical properties should be modified as listed below to take account of the presence of the solid. This should yield a safe relief size  

The mass of liquid plus solid should be used in place of the mass of liquid. 

An average density for the liquid and solid should be used. 

Consideration should be given to whether the solid particles are small enough to be in thermal equilibrium with the liquid. If this will be the case, then an average heat capacity should be used. If the solid temperature is expected to lag behind that of the liquid, then a safe assumption is that the solid has zero heat capacity, i.e. 

Latent heat and vapour density should be evaluated on the basis of the composition of the vapour composition, and so will not be affected by the presence of solids. 

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