SDI Open Water Scuba Diver Practice Exam

What must scuba cylinders periodically undergo to ensure safety?

1. Hydrostatic testing

2. Visual inspections

3. Anticorrosive recoating

4. Both hydrostatic testing and visual inspections

The correct answer is: Both hydrostatic testing and visual inspections

Scuba cylinders require regular maintenance to ensure they are safe for diving, and this maintenance involves both hydrostatic testing and visual inspections. Hydrostatic testing is a procedure that checks the structural integrity and pressure resistance of the cylinder. During this test, the cylinder is filled with water and pressurized to evaluate whether it can hold the necessary pressure without leaking or deforming, which is critical because a failure under pressure could lead to dangerous situations underwater. Visual inspections are also essential as they involve a careful examination of the cylinder's exterior and interior for signs of wear, corrosion, dents, and other potential issues. These inspections help identify problems that may not be evident during hydrostatic testing alone, ensuring that the cylinders remain in good condition throughout their use. Together, these two practices form a comprehensive approach to maintaining scuba cylinders. Neglecting either one could compromise the safety of the diver, making it crucial that both hydrostatic testing and visual inspections are part of routine maintenance schedules.