Which part of a boiler system is required to fully drain it?

Study for the Massachusetts 3rd Class Engineer Exam. Access flashcards and multiple choice questions with hints and explanations. Prepare for success on your exam!

In order to fully drain a boiler system, it is essential to have a bottom blowoff pipe connected to the lowest point of the boiler. This design allows for the complete removal of water, sediment, and other impurities that may settle at the bottom of the boiler over time. By ensuring that the drainage point is at the lowest location, the entire volume of water can be evacuated effectively, which not only maintains the boiler's efficiency but also helps to prevent corrosion and operational issues.

A top blowoff pipe would not be effective for draining the system, as it would leave residual water and sludge in the bottom of the boiler that could lead to problems. A side drain valve, while practical for routine maintenance, does not necessarily allow for complete drainage since it may not reach the lowest points where sediment collects. The safety relief valve is a critical safety feature for preventing pressure build-up but is not designed or intended for drainage purposes. Thus, the bottom blowoff pipe is the most effective method for fully draining a boiler system.

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