Slip blinds thicker than 3/8 inch are required if hydro test pressure exceeds the slip band's rating. Which of the following statements aligns with this rule?

• A. It never applies to any hydro test
• B. It applies only to tests below the rating
• C. It applies only to gas tests
• D. It applies when the hydro test pressure exceeds the slip band's rating

Answer: (B)

The rule is about what happens when hydro test pressure goes beyond what the slip band can safely handle. If the hydro test pressure exceeds the slip band's rating, thicker slip blinds (over 3/8 inch) are required to maintain safety margins. The statement that matches this is that it applies when the hydro test pressure exceeds the slip band's rating. It does not apply to tests below the rating, it’s not limited to gas tests, and it isn’t never applicable—the condition is specifically tied to exceeding the rating.