What should be measured after backfilling an FRP tank to ensure proper installation?

Measuring the tank diameter after backfilling is essential to determine if any deflection has occurred. This is particularly critical for Fiber Reinforced Plastic (FRP) tanks, which can be susceptible to deformation from external pressures if they were improperly installed or backfilled.

During the installation process, the integrity of the tank must be maintained to ensure it operates efficiently and safely. A deflected tank can lead to structural failure, leaks, or other significant issues over time. By checking the tank diameter post-backfill, operators can detect any anomalies that may suggest the tank has shifted or been compromised during the installation process.

This measurement directly addresses the physical state of the tank after installation, whereas measuring the height of the tank, circumference of the excavation, or the weight of the backfill material does not provide specific insight into the tank's structural integrity and potential deflection.