When must individual shutoff valves be included in a boiler installation?

In boiler installations, individual shutoff valves are required for multiple boiler or modular boiler systems to ensure safe and efficient operation. This requirement exists because having separate shutoff valves allows for the isolation of each boiler for maintenance, inspection, or emergency situations without affecting the operation of the other units in the system. It enhances safety by enabling quick access to shut down a specific boiler if issues arise, while the other units can continue to function.

In contrast, single boiler installations may not require individual shutoff valves since there is only one unit to manage. High pressure systems and systems requiring automatic regulation also have specific operational standards and safety mechanisms, but the explicit requirement for individual isolation valves is a defining characteristic of multiple boiler setups. This promotes better maintenance practices and overall safety within complex boiler installations, aligning with best practices as outlined in the North Carolina Mechanical Code.