What is the minimum pressure required for nitrogen blanket lay-up?

The minimum pressure required for nitrogen blanket lay-up is 5 psig. This pressure is essential to ensure that the nitrogen blanket effectively displaces oxygen in the system, preventing corrosion and other potential damage that moisture and oxygen can cause to the equipment over time. A nitrogen blanket is a common practice in many industrial settings, including power plants and other facilities where equipment is laid up for extended periods. The nature of the operation calls for maintaining a pressure that is high enough to create a sufficient barrier against atmosphere infiltration, hence the choice of 5 psig as the appropriate minimum.

Choosing a lower pressure would not provide adequate protection, while pressures above 5 psig may be used in specific circumstances to enhance the effectiveness of the nitrogen blanket, but they exceed the minimum requirements. The selected pressure must balance between being effective and practical for the equipment involved.