Can a visual inspection be performed on a cylinder instead of a hydro test?

The correct choice indicates that a visual inspection can be performed on a cylinder as long as it is continuously in service and not emptied while under pressure. This approach underscores the importance of monitoring the condition of cylinders that are actively used and highlights the relevance of maintaining them under appropriate service conditions.

When cylinders are kept under constant pressure and in service, they can be subject to less wear and damage than those that are cycled between pressure and vacuum. Therefore, a thorough visual inspection can be sufficient to ensure that the cylinder remains in a safe and suitable condition for use. Such inspections typically focus on identifying any signs of physical damage, corrosion, or other potential issues that could compromise the integrity of the cylinder.

Conducting a visual inspection under these circumstances can be a practical and effective alternative to a hydrostatic test, which is more resource-intensive and time-consuming. It allows for ongoing safety assurance without the need for immediate hydro testing, assuming that there are no indicators that would warrant such testing.

In contrast, other options suggest conditions that are either too restrictive or incorrectly limit the applicability of visual inspections, thereby overlooking practical industry practices that may allow for safe cylinder usage and maintenance.