What means are used to protect polypropylene equipment from mechanical damage and abuse?
Depending on the application various methods are used to protect the plastic tanks. For strip pickling lines using sulfuric or hydrochloric acids we use granite skids, side guides, and weirs. For nitric/hydrofluoric service we encapsulate corrosion resistant steel bars in polypropylene tubes. For batch tanks we often use solid polypropylene cradles to support the load and to keep the load away from the tank walls and bottom. How are repairs and modifications made to polypropylene? Since polypropylene is weldable, thermoplastic equipment made from it is readily repaired or modified. Hand welding can be accomplished with simple welding techniques. Extrusion welding and fusion butt welding are used in our shop as the primary welding methods. Hand welding with multiple beads of weld is limited to areas that can not be extrusion welded and to field welding applications.
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