True or False: Vacuum receivers must withstand atmospheric pressure only.

Vacuum receivers are designed to operate under negative pressure, which means they must be able to withstand not only atmospheric pressure but also the pressure differences created when a vacuum is applied. If a vacuum receiver were to fail to withstand pressures greater than atmospheric, it could result in structural failure or leakage, compromising the integrity of the entire system.

Furthermore, vacuum receivers operate in systems that require them to collect and trap gases or air, thus creating a vacuum condition. As such, they often experience internal pressures that can fluctuate based on the vacuum levels being maintained, and should be rated to endure these conditions safely. This is why the statement that they must only withstand atmospheric pressure is false; they require construction that considers various factors including the creation of a vacuum.