This process is far less of a challenge than to discharge the same in simplistic terms. As long as diameters are kept generous the product drop by gravity and risk of process top is kept to a minimal.
There are however other "risks" to consider when filling an IBC such as:
Dust escape – especially when disconnecting the IBC.
Segregation risk during the free fall – which is often overlooked in mixing applications.
Venting – to ensure no pressure build-up, potentially damaging the IBC or operator.
Weighing – in case a recipe or other specific amount is being collected.
Visit the Matcon Limited website for more information on Manual IBC filling