Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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Page 632 of 707

better impact resistance to epoxies than do aliphatic or aromatic curing systems. The intention of these three examples of the resin systems utilized for con- structing fiberglass-reinforced tanks and tank linings is to point out the neces- sity of knowing the chemistry of the system, or relying on reputable manufacturers to provide the technology required to make the best selection to fulfill end use requirements. Where the chemistry of these various systems contributes substantially to the physical properties of the structure, the most profound influence on physical properties is derived from the proper design and use of various reinforcing mediums, i.e., glass fibers, glass cloth, roving, mat, veil, etc. Consult reputable man- ufacturers for proper design consistent with the end-use mandates for chemical, thermal, and physical properties. The chemical resistance of FRP is comparable to the chemical resistance data shown in Table VII. Table VIII summarizes the chemical resistance of PVC, PE, and PP. The mechanically bonded thermoplastic lining system previously described cir- cumvents many of the limitations inherent in some plastics, as well as coating, and many other elastomeric and resin lining systems. The sonically welded anchor studs are of the same plastic as the sheet and are placed at approxi- mately 2-3 in. on centers. Sheet thickness and anchor stud density provide the rigidity necessary for a successful thermoplastic lining application. The studs, being of the same plastic as the sheet, ensure thermal and physical property sim- ilarity. The lining system is equally appropriate for new and existing concrete, as well as for salvaging used steel tanks. Upon removal of the concrete forms and the welding of all joints, utilizing thermoplastic welding techniques, spark testing is used for quality assurance of the lining. The system is available in a single- or double-wall system to ensure compliance with the most rigid of environmental mandates. Leak detection systems are available and are integral with the lining system. 631

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