What insulation to choose for pipelines of dryers?

Hello. For this type of equipment, I would recommend using basalt cylinders as an insulating material. No matter where the pipeline for the drying machines will be laid, this material is absolutely non-combustible. Also, basalt cylinders not only insulate hot pipes, but also avoid heat loss.

If basalt cylinders are too expensive for you, then you can consider a couple of more affordable analogues: mineral wool and pipe insulation made of polyethylene foam. The latter is the least effective, but the most affordable.