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What is the size of the test gauge connection in a water column?

  1. 3/4 inch

  2. 1/2 inch

  3. 1 inch

  4. 2 inches

The correct answer is: 1/2 inch

The size of the test gauge connection in a water column is important for ensuring accurate pressure readings and proper functioning of the boiler's safety controls. A 1/2 inch connection is standard for water columns. This size allows for adequate flow of water to the gauge while ensuring that the pressure measurements are precise. Using a connection that is too large could lead to lag in response time for pressure changes, while a smaller size would risk obstruction or inadequate readings. This specification helps maintain the integrity and efficiency of the boiler system, which is critical in low-pressure boiler operations.