Where can hydrostatic relief valves be installed?

The correct answer is that hydrostatic relief valves can be installed in each section of hose or piping where liquid propane can be isolated between shut-offs. This placement is crucial for safety as it allows for the relief of excess pressure that may build up in the system, particularly in isolated sections where pressure fluctuations can occur.

When liquid propane is subject to heat, it can vaporize, leading to increased pressure that must be managed to prevent equipment failure or hazards. By having relief valves in various sections of the piping, you ensure that any potential pressure buildup can be addressed immediately, reducing the risk of leaks or explosions.

The other options do not adequately serve the purpose of hydrostatic relief valves. For instance, installing a relief valve only at the back of the tank would not provide adequate protection for the entire system, as pressure could build up in other sections. Placing the valves only near the source of ignition poses an increased risk by not protecting other critical components of the system. Lastly, installing a relief valve solely on the outlet of the tank would also be insufficient, as it would not help with pressure regulation throughout the entire piping network.