California ICC UST Inspector Practice Exam

When repairing fiberglass tanks, which of the following is an incorrect practice?

1. Small fractures and fissures may be repaired with epoxy

2. Fiberglass cloth must be 12 x 12 inches centered over the area to be repaired

3. A second layer of fiberglass cloth shall be directly installed over the primary layer

4. The repaired tank must be tested for tightness within 30 days

The correct answer is: A second layer of fiberglass cloth shall be directly installed over the primary layer

When it comes to repairing fiberglass tanks, the correct answer highlights a common misconception about the layering process during repairs. In fiberglass tank repair, it is often recommended to use a single layer of fiberglass cloth to ensure proper adhesion and structural integrity of the repair. Adding a second layer directly on top without proper preparation can actually lead to issues such as inadequate bonding, air pockets, or uneven surfaces which can jeopardize the repair. The other practices mentioned are acceptable and align with commonly accepted repair methods. Using epoxy is standard for sealing small fractures and fissures, as it provides strong adhesion and prevents further damage. The guideline to use a fiberglass cloth measuring 12 x 12 inches allows for sufficient coverage over the damaged area, which contributes to the strength and durability of the repair. Additionally, performing a tightness test on the repaired tank within 30 days helps ensure that the repair was successful and that no leaks are present, which is crucial for environmental safety and compliance with regulations.