What negative effect does oil have on boiler feedwater?

Oil has a detrimental effect on boiler feedwater primarily because it causes boiler water to foam. When oil is present in the feedwater, it can create an emulsion with the water, leading to the formation of bubbles or foam. This foaming can interfere with the normal operation of the boiler, as it can affect heat transfer efficiency, lead to water carryover into the steam, and potentially damage components like steam traps and turbines.

Foaming is also problematic because it can disrupt the water level control in the boiler, making it difficult to maintain the proper water level. This can result in low-water conditions, which could damage the boiler. Therefore, maintaining proper feedwater quality, free of oils and other contaminants, is crucial to ensuring safe and efficient boiler operation.