Slip blinds must be thicker than 3/8 inch under which condition when an exchanger is blinded off?

Slip blinds must be thicker than 3/8 inch under which condition when an exchanger is blinded off?

• A. When the hydro test pressure is lower than the rating of a 3/8 inch slip band
• B. When the hydro test pressure is equal to the rating of a 3/8 inch slip band
• C. When the hydro test pressure is for a different test procedure
• D. When the hydro test pressure exceeds the rating of a 3/8 inch slip band

Answer: (D)

The key idea is that the strength of a slip blind is tied to its thickness: thicker walls can withstand higher hydrostatic pressures. A slip blind with a 3/8 inch slip band has a specific pressure rating, and if the hydrotest pressure pushes beyond that rating, the thinner band would not reliably contain the pressure. In that case, using a slip blind thicker than 3/8 inch increases the strength and ensures the blind can safely resist the higher test pressure. So the requirement to be thicker applies specifically when the hydro test pressure exceeds the rating of a 3/8 inch slip band.

The key idea is that the strength of a slip blind is tied to its thickness: thicker walls can withstand higher hydrostatic pressures. A slip blind with a 3/8 inch slip band has a specific pressure rating, and if the hydrotest pressure pushes beyond that rating, the thinner band would not reliably contain the pressure. In that case, using a slip blind thicker than 3/8 inch increases the strength and ensures the blind can safely resist the higher test pressure. So the requirement to be thicker applies specifically when the hydro test pressure exceeds the rating of a 3/8 inch slip band.