Class 5 Boiler Practice Exam 2025 - Free Boiler Certification Practice Questions and Study Guide

Building Service Steam Piping typically operates at a minimum pressure of 150 psi. This level of pressure is considered standard because it ensures that steam can effectively distribute heat throughout a building's heating systems, such as radiators or air handlers. It also allows for the efficient operation of various equipment that relies on steam heating.

Operating at this pressure helps in preventing issues related to insufficient heating or condensation, which can occur at lower pressures. Additionally, a pressure minimum of 150 psi helps ensure that steam remains in a superheated state, reducing the chances of moisture forming in the piping system, which can lead to leaks or corrosion over time.

While other options present different pressure levels, they do not align with the typical operational requirements for effective steam distribution in building services.