With insulated lines, it is necessary to extend vents throughout the insulation because of the addition of vent bosses and extension items. For permeant chemistries vent bosses are used with PTFE plugs. The manufacture of glass-lined steel products is a combination of 3 processes: production in the glass, steel fabrication, https://milonhyl16161.buyoutblog.com/28402153/how-to-test-the-ph-of-a-glass-lined-reactor