Where should the siphon be located in relation to a gauge?

The siphon should be located before the gauge in a steam boiler system. This positioning is crucial because it helps to protect the pressure gauge from the high temperatures of the steam. When a siphon is placed before the gauge, it creates a water seal, which cools the steam as it passes through. This reduces the likelihood of thermal distortion that could affect the gauge's accuracy and functionality.

By placing the siphon before the gauge, it effectively prevents direct contact between the hot steam and the sensing element of the gauge, thereby ensuring that the gauge provides an accurate reading of the steam pressure. This practice is vital for maintaining safety and efficiency in the operation of high-pressure boiler systems, as it minimizes the risks of gauge failure due to extreme thermal exposure.

To clarify the other options, placing a siphon after the gauge would expose the gauge to heat, leading to inaccurate readings or gauge damage. In-line with the gauge could also lead to similar problems and does not provide protection from high temperatures effectively. Lastly, locating a siphon at the pump does not serve the purpose of protecting the gauge or ensuring accurate readings in terms of steam pressure.