The following situations may require the use of a telescopic drop tube:
Internal friction in flowing products can cause electrostatic charge. This physical effect can lead to sparking which is mandatory to be avoided, especially when combustible or explosive fluids are loaded. Spark prevention can be achieved most efficiently by creating bottom contact with a telescopic drop tube.
Bottom contact with a telescopic drop tube is recommended for loading of foaming products.
For loading applications with height restrictions (e.g. by a roof) a telescopic drop tube is the ideal solution compared with a long and rigid drop tube.