When installing an end-of-main-vent, how far should it be elevated from the last fitting at the end of the steam main?

When installing an end-of-main vent in a steam system, it's important to ensure that the vent is positioned properly to function effectively. Elevating the vent 6 to 10 inches from the last fitting at the end of the steam main is the appropriate practice. This elevation helps in two critical ways: it allows any condensate that may have collected in the main to drain away from the vent and prevents water from interfering with the venting of steam.

If the vent is positioned too low, it might not allow for proper air and steam flow, which could lead to inefficiency in the system. Conversely, elevating it beyond what is necessary may not provide additional benefits and could complicate installation or increase the risk of improper water drainage. Thus, the 6 to 10-inch distance is a balance that facilitates optimal performance in the steam system.