API 571 Certification Practice Test 2025 – Complete Exam Prep for Corrosion & Materials

Polyethylene or glass-lined coatings are widely recognized for their effectiveness as tank linings in resisting corrosion. These materials provide a smooth, impermeable surface that protects the tank from corrosive substances, making them ideal for various industries, including chemical and food processing.

Polyethylene offers excellent chemical resistance and durability, making it a popular choice for storing corrosive liquids. Its resilience to various acids and bases helps to extend the life of the storage tanks and minimize the risk of leaks or failures.

Glass-lined coatings, on the other hand, involve a process where glass is fused to a metal substrate, creating a robust barrier that is highly resistant to harsh chemicals and high-temperature environments. This combination provides a protective layer that does not react with the stored materials, ensuring the integrity of both the tank and its contents.

In contrast, polypropylene, while also used in some applications, does not have the same level of broad chemical resistance and durability as polyethylene or glass-lined coatings. Steel coatings can provide some level of protection, but they are generally less effective than glass or polyethylene linings against severe corrosive environments. Copper linings, while beneficial in specific applications, are susceptible to corrosion and may not be suitable for all tank contents, especially in acidic conditions.