Isaner

Looks like an obsolete "gasometer" https://en.wikipedia.org/wiki/Gas_holder which was used for balancing the gas pressure in the plant.

Quality journalism as usual. The article in "The Nation": Wiriya Katchan, 45, along with his daughter Nucharin, 23, his nieces aged 14 and 11 and a nephew aged eight had left their house in Satuk district on Monday morning on a tractor to scoop up river sand for his home improvement project.