Final answer:
A cylinder installed alongside a building must be positioned upright and perpendicular to the ground for the relief device to properly discharge.
Step-by-step explanation:
In order for the relief device on a cylinder installed alongside a building to properly discharge, the cylinder must be positioned upright and perpendicular to the ground. This ensures that the relief device is at the top of the cylinder, allowing any excess pressure or fluid to be released. If the cylinder is positioned horizontally or at an angle, it may prevent proper discharge and potentially cause damage.