TAPPI TIP 0402-28 2026 Edition

Current Revision
Best Practice for Inspecting Used Fiber-Reinforced Plastic (FRP) Equipment

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TAPPI TIP 0402-28 2026 Edition
This document describes how to inspect fiber-reinforced plastic (FRP) equipment that is already in service (β€œused”) to determine its condition, knowledge of which is used to assess fitness for continued service and to plan repairs. Three complementary types of inspection are described: (1) External inspection with the equipment in service (supplemented with infrared thermography inspection); (2) External inspection with the equipment out of service; (3) Internal inspection. Inspection methods, including infra-red thermography, Barcol hardness, acoustic emission testing, spark testing, and radiography are discussed.

These inspection guidelines apply to conventional FRP and β€œdual laminate” FRP equipment (tanks, piping, stacks, ducts, etc.). Inspection of resin-based linings, which can be FRP laminates or resin vehicles filled with inert materials and trowel or spray-applied, is not directly covered although the general principles and practices discussed herein can be applied where such linings are protective barriers for metal and non-metal substrates.
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