What should be avoided to decrease problems during tightness testing?

To effectively decrease problems during tightness testing, using loose fitting and plastic caps should be avoided. Tightness testing is critical for assessing the integrity of underground storage tanks, ensuring that they do not leak hazardous materials into the environment. Loose fitting caps can compromise the testing process by allowing air or fluid ingress or egress, leading to inaccurate test results. If the caps do not create a proper seal, the pressure changes that are expected during the testing process may not be observed, resulting in unreliable indications of tightness or leaks.

In contrast, tight-fitting caps are designed to maintain a secure seal, thus contributing positively to the testing process. Worn-out gaskets can lead to the same issues as loose caps, but they are a separate concern; ensuring all components are in good condition is essential for accurate testing. Moisture in the system could create complications, but the primary issue revolves around achieving a proper seal. Therefore, it is clear that avoiding loose fitting and plastic caps is pivotal for facilitating effective and reliable tightness testing.