Imagine that your pump dies out on you and you cannot get water in your tank, as the pump would not fetch the water from the sump. What would you do? Open up the sump and draw in water with your own hands? This is such a tiresome job.
In an industry where there is a continuous need for water supply to get the machines running, this is a huge issue. The moment water supply dies on them, the whole production might have to be stopped, because there is no cooling agent and then there is no way that the machines can run without causing any personnel damage.
However, there is a very feasible alternative to avoid such situations. The best thing to do is install a batter backup for the pump, just to draw water from the sump. This battery backup is very handy and useful for all commercial outlets; especially industries where there is always some metal work going around. The machines get easily heated due to the friction and water is primarily used as a cooling agent in these jobs.
Nevertheless, the battery could run out from time to time, even when you leave it without using, hence constant maintenance is a requisite.