Under what conditions can the size of bottom blow-down lines be reduced?

The sizing of bottom blow-down lines is critical for ensuring proper drainage and maintenance of a boiler's water quality. The correct answer to this question indicates that the size of bottom blow-down lines should never be reduced, regardless of other conditions.

This principle is primarily based on the need to maintain adequate flow rates for the removal of impurities and sediment that accumulate in the bottom of the boiler. Reducing the size of the blow-down lines could hinder the effective removal of these deposits, leading to potential boiler efficiency issues or even failure due to sediment buildup.

Maintaining the prescribed pipe size is essential to ensure that blow-down operations can be performed safely and efficiently, allowing for sufficient water flow and preventing any backpressure that could interfere with system operation. The integrity of the blow-down system is paramount to the overall performance and safety of the boiler system, which is why the size should remain consistent with the manufacturer's specifications and industry standards.