What is the WIP test result for service (known suction level)?

• A. 2 inches
• B. 1 inch or below known suction level
• C. 0.5 inches
• D. 1.5 inches

Answer: (B)

In this WIP testing context, you’re looking at how far the measured result can diverge from the known suction level while still meeting the required tolerance. The key idea is that the result must stay within a tight limit relative to that known suction level to ensure the system will perform properly under service conditions.

The correct choice matches that exact allowance: a result that is within one inch of the known suction level. This expresses the standard tolerance being used—no more than one inch deviation below (or toward) the known suction. Larger deviations indicate the test has exceeded the acceptable tolerance and would flag a potential issue. A smaller figure like 0.5 inches is still within tolerance, but the option that best represents the official criterion is the one that states the limit as one inch or less.