How must a cylinder installed alongside a building be positioned for the relief device to discharge properly?

To ensure the proper functioning of the relief device on a liquefied petroleum gas (LPG) cylinder, it is essential that the cylinder is positioned at a safe distance from buildings and potential ignition sources. The specified requirement of being 3 feet away horizontally from any building and 5 feet from any ignition source helps to mitigate risks associated with the release of gas, particularly in the event of excess pressure build-up within the cylinder that might cause the relief device to discharge.

The logic behind this positioning is primarily focused on safety. If a relief device activates due to overpressure, it discharges gas which could be flammable. By maintaining these distances, the risks of igniting the gas and causing a fire or explosion are minimized. Furthermore, being strategically positioned away from buildings helps prevent gas from accumulating against structural elements, which could otherwise lead to dangerous situations.

By ensuring that the cylinder is situated correctly according to the NFPA 58 guidelines, one can promote a safer environment while using liquefied petroleum gas, addressing potential hazards effectively.