Which type of gauge glass is used for pressures above 2800kPa?

Flat gauge glass is the appropriate choice for applications involving pressures above 2800 kPa due to its design and structural integrity. Flat gauge glasses are specifically engineered to withstand high pressures and provide a clear view of the liquid level in boilers or tanks. The flat surface allows for better distribution of stresses across the glass, reducing the likelihood of breakage under extreme conditions.

In contrast, other types of gauge glasses, such as bulls eye, round, or rectangular, may not offer the same level of stability or strength under high-pressure environments. Bulls eye gauge glasses often incorporate a convex design, which can be more susceptible to pressure-related failures. Round gauge glasses, while useful in certain situations, may not provide as robust a structure for high-pressure applications. Rectangular gauge glasses may also lack the necessary reinforcement to handle the pressures above 2800 kPa effectively.

Thus, flat gauge glass is the preferred option, thanks to its ability to maintain reliability and safety in high-pressure monitoring situations.