A failed tank lining announces itself at inspection with a signature, and reading it correctly matters, because each mechanism traces to a different root error and a different fix. These are the five that account for nearly everything found on floor scans and internal inspections.
1. Osmotic blistering
Domed blisters, often fluid filled, scattered or in drifts across the floor: soluble salts left on the steel before lining. The salts pull water through the film osmotically until pressure lifts it. The error was skipping salt testing after blast; the fix is reblast with washing and verified limits, then reline.
2. Disbondment at welds and edges
Lining peeling from weld caps, corners and the floor to shell junction points to missed stripe coats and thin film on geometry. High build linings pull back from sharp edges as they cure; specifications demand stripe coating precisely there.
3. Cracking and checking
Star cracks and mud checking mean film stress: over thick application, cure forced in hot UAE steel temperatures, or a lining too rigid for the tank's thermal movement. The data sheet maximum DFT is a real number, not advice.
4. Cargo attack
Softening, swelling or colour stripping of the film is chemistry mismatch: the cargo exceeded the lining's resistance, classically methanol rich product in a standard epoxy, the phenolic question from our selection guide answered wrongly or never asked.
5. Holiday corrosion
Sharp edged pits under an otherwise sound film mark application holidays never found because testing was skipped or rushed. The lining worked everywhere except the pinholes, which is to say it failed.
Every mechanism is preventable at specification and QA stage, which is the cheapest place a tank owner will ever spend money. MENA Industrial Supplies supplies lining systems with the documentation to get the QA right, via the oil, gas and refinery coatings page.