Brix is not a flow-resistance measurement
Brix relates to soluble-solids concentration on a defined measurement basis. It is useful in sugar processing, but real process liquors contain different dissolved components and may contain suspended crystals. Two samples with the same reported Brix can behave differently in a pipe because of composition, temperature and solids. A pump enquiry should not convert Brix directly into viscosity without a justified product correlation.
Density connects mass flow and volume flow
Use density at the relevant temperature when converting tonnes per hour into cubic metres per hour. As a calculation example only, 18 t/h divided by 1.4 t/m³ gives about 12.9 m³/h. This does not establish the density of any specific molasses. A vessel-cycle calculation based on volume needs the actual density if the process requirement is expressed as mass throughput.
Describe the crystal phase separately
For magma, include the crystal mass fraction, particle-size distribution and any limit on breakage. Explain how the sample was taken and whether the laboratory result describes the liquid phase or the whole suspension. A refractometer result from separated mother liquor cannot fully characterize the flow behavior of the original suspension.
Build a usable operating envelope
Provide minimum, normal and maximum temperatures, Brix, density and viscosity, together with any solids or crystal range. Identify which combinations can occur at startup or during an upset. Avoid combining unrelated worst cases into a physically impossible product, but do not ignore a real cold, concentrated condition. The supplier can then review vessel filling, valve passage and discharge losses against a coherent duty.
General engineering guidance. Numerical examples are illustrative; project specifications and acceptance criteria are agreed for the actual duty.