Chemicals used in paper mills are often acidic or caustic, which increases the risk for corrosion and stress cracking. If not detected in time, corrosion can cause structures to fail or leak. Aqualified uses ultrasonic digital thickness testing to find material losses down to the thousandth of an inch. This allows for repair before a costly shut down. Cyclic loading from repeated movements can lead to cracking. Paper mills use very large pieces of equipment to turn raw materials into finished products. Each step requires a different machine and each machine requires periodic inspections to keep the operation running smoothly and safely.
Even with wireless technology available, there is still a large demand for paper products. Chemicals used in paper mills are often acidic or caustic, which increases the risk for corrosion and stress cracking. The cycling of heat, pressure, and moisture can lead to changes in metal structure. If not detected in time, corrosion can cause structures to fail or leak. ASTM International publishes standard practices that provide insight on what to inspect and how to inspect it.
We can perform inspections to detect surface and subsurface flaws on various components regardless of whether they are ferromagnetic, electrically conductive, welded, or painted. Visual inspections of welds is an efficient way to determine whether they are performing or failing. Acoustic Emissions testing uses ultrasonic transducers to “hear” if a crack is growing. Cast iron dryer drums are brittle, so if they are pressurized and remain stationary for too long, they are at a higher risk for failing to stay within their required tolerances.