I don't know whether anyone uses this, but I've been using it for a while and I have never seen it on the forums. The idea is that gas pipe bridges are perfectly insulating and only cost 50, whereas insulated gas pipes cost 400. So, when I need to transport high or low temperature gases or liquids, I save materials by essentially spamming pipe bridges.
In the image below, both pipes transport gas 17 units. The insulated gas pipes cost 6,800 kg of insulating material, which can be a seri