What are the hydrostatic test methods that utilize design pressure?

The correct answer highlights the hydrostatic test methods that use specific percentages of design pressure to ensure the safety and integrity of vessels and piping under hydrostatic pressure. Hydrostatic testing is a vital practice that involves filling a system with water and then pressurizing it to test for leaks and material strength.

When determining the appropriate testing pressure, it is standard practice to conduct tests at a minimum of 1.5 times the design pressure. The 135% and 150% figures are commonly used benchmarks in the industry, allowing for safe operational margins while ensuring that the tested components can withstand operating conditions without failure.

Utilizing these specific percentages helps to verify the reliability and structural integrity of the components being tested. Maintaining a testing standard within this range is often mandated by industry codes and standards, which aim to ensure safety and minimize the risk of system failures during operation.