Set the decision before the test
List the uncertainties: slow filling, crystal damage, foaming, residual inventory, valve behavior or air consumption. Give each one a measurement and an acceptance criterion. A demonstration that merely moves a small amount of liquid proves much less than a trial designed around the factory duty.
Make the test representative
Record product composition, temperature, density, viscosity and solids. Describe the pipe route, vessel working volume, receiver and gas supply. If the test route differs from the site, explain which conclusions can be transferred and which still need calculation. Water may be useful for leak and sequence checks, but it does not reproduce a viscous or crystal-bearing product.
Measure complete cycles
Collect enough cycles to capture repeatability, changeover and any gradual product accumulation. Separate filling, pressurization, discharge and vent times. Record dynamic supply pressure and total utility use on a defined basis. Take product-quality samples using the same method before and after transfer, including any required holding period.
Report limits as well as results
State the tested envelope and any abnormal events. Include unsuccessful conditions if they define an application boundary. The next step might be a revised valve, a larger inlet, better air supply or a decision not to use the technology. A clear trial report supports a defensible guarantee and is more useful than a single maximum-flow figure without operating conditions.
General engineering guidance. Numerical examples are illustrative; project specifications and acceptance criteria are agreed for the actual duty.