If the distance is over 40 cm, there are usually no problems. If we cannot get down into the cistern, we can in most cases install a side hatch on the cistern, we can do this even if there is oil left in the cistern, but it should not be more than half full.
It's tight between the manhole and the roof, what do you do then?
![](https://vimabindustrialcleaning.se/wp-content/uploads/2021/11/skissbild.jpg)