What is one effect of high alkalinity in feedwater?

High alkalinity in feedwater can indeed lead to foaming and steam carryover. When the alkalinity levels are elevated, it may result in the formation of small bubbles or foam, which can carry over into the steam. This is problematic because it can introduce impurities into the steam system and potentially damage equipment downstream.

The presence of foam in the boiler can also reduce the heat transfer efficiency and hinder the proper operation of steam generation. Additionally, steam carryover can result in decreased water quality and contamination of the processes that utilize the steam, which may lead to further operational issues.

In contrast, while lower alkalinity might improve the water clarity and maintain desired chemical balances, high alkalinity's primary concern is its contribution to foaming and steam carryover, which can have significant effects on system performance and reliability.