Washington DC 3rd Class Boiler Practice Test

What is the minimum discharge pipe height for a safety valve?

6 Feet High 4 Feet High 2 Feet High 8 Feet High

Correct Answer:

6 Feet High

Explanation:

Discharge piping height is about safety: when a safety valve opens, hot steam and condensate shoot through the discharge line, so the outlet must be placed where people and nearby equipment aren’t exposed to that jet. Six feet above the floor provides a safe clearance, reducing the risk of burns from the steam or splashing condensate and keeping the discharge out of walkways and work areas. Lower heights would increase the chance of contact with the jet or leaking onto floors and surfaces, while a higher outlet isn’t required for the minimum safety and would just complicate piping routing.

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