What is the satisfactory concentration of chlorides in boiler water compared to feedwater in low and medium pressure boilers?

In the context of low and medium pressure boilers, maintaining an appropriate concentration of chlorides in the boiler water is crucial for preventing corrosion and ensuring the longevity of the boiler system. The satisfactory concentration of chlorides in boiler water is often set in relation to the feedwater concentration.

For low and medium pressure boilers, the acceptable ratio typically allows for a maximum ratio of about 10 to 1, meaning that the concentration of chlorides in the boiler water should not exceed ten times that of the feedwater. This limit helps to minimize corrosion risks, which are exacerbated by high chloride levels.

Essentially, maintaining a concentration of chlorides in boiler water that is no more than ten times that of the feedwater (indicated by the selected answer) is a well-recognized guideline within the industry. It reflects the need to carefully balance operational chemistry to extend the life and efficiency of boiler systems while preventing damage due to corrosive elements.

Thus, selecting a concentration of 10 aligns with best practices about managing boiler water chemistry in low and medium-pressure applications.