Limitation:

The primary limitation is the maximum pressure the sight glass can safely withstand. Exceeding the rated pressure can lead to failure, such as cracking or rupture of the sight glass, resulting in leaks or other safety hazards.

The sight glass must be constructed from materials with sufficient strength and durability to handle the specified pressure rating. This may include materials such as tempered glass, borosilicate glass, or high-strength metals like stainless steel.

Proper sealing is crucial to ensure the integrity of the sight glass under high-pressure conditions. Gaskets, O-rings, or other sealing mechanisms must be selected and installed correctly to prevent leaks.

While the pressure rating indicates the maximum pressure the sight glass can handle, it's also essential to consider the temperature of the fluid or gas within the system. High temperatures can affect the structural integrity of the sight glass and its sealing components.

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