Which of the following answers is not true regarding the blow-down fitting radius?

The statement that it can be less than 3 times the diameter is not true because proper engineering practices dictate specific minimum on blow-down fitting radius to maintain effective drainage and minimize turbulence in the piping system. This minimum radius helps in reducing the risk of erosion and allows for better flow through the piping. Typically, a radius of at least 3 times the diameter is advisable to ensure that the fluid can flow smoothly without causing excessive wear on the fitting or surrounding pipe.

On the other hand, stating that the radius should be at least 2 times the diameter is consistent with common piping practices. The requirement that it cannot exceed 4 times the diameter ensures that the radius does not become unnecessarily large, potentially leading to an inefficient system. The mention of the blow-down fitting’s purpose to ensure proper drainage is also accurate, as it plays a critical role in removing collected condensate or debris effectively.