As mentioned in one of our previous blogs, blast hose is consists of 3 main components; an inner tube, braiding (reinforcement) and an outer cover.
Despite its wear resistant compound, the inner tube of blast hose is prone to wear over time. Some tubes have better wear resistance than others. Once the inner tube is worn, the next component to be affected will be the braiding. The braiding of blast hose is what is responsible for containing the air pressure. If the braiding starts to wear there is a possibility that the blast hose may explode, inflicting serious damage.
As blast hose wears it becomes soft and spongy. It is important that blast hose is regularly inspection by squeezing it every 200mm by hand and feeling for soft/spongy areas. If the hose can be squashed flat it means that the hose is worn and is no longer safe. The hose should always be firm and be able to flex back to its original design.
Spongy parts of the hose can be cut out and reconnected with couplings and a safety whip. The main areas of concern are the hose on the operator’s side and the hose at the side of the blast pot, because of continuous manipulation. These two ends must be checked on a daily basis.
Always ensure that the blast hose is 3-4 times the size of the nozzle, keeping in mind that the nozzle also wears.