What should be the design characteristic of low pressure chambers in relation to excess pressure?

The correct answer focuses on the capability of low pressure chambers to withstand operating pressures. Low pressure chambers are designed to operate safely under the pressures they encounter during normal functioning, which includes the ability to handle expected excess pressures that may occur due to fluctuations in system operation. This characteristic ensures that the chamber will not fail or compromise the integrity of the CNG system even when facing pressure variations.

A design that withstands operating pressures is crucial for maintaining safety and reliability. It helps to ensure that potential pressures that are experienced do not exceed the limits, preventing leaks or ruptures that could lead to accidents or hazardous conditions. Therefore, the structural integrity and appropriate material selection are vital components in the design process for low pressure chambers.

The other options, while relevant to specific considerations in design and safety, do not directly address the fundamental requirement for a low pressure chamber to manage and withstand the pressures it is expected to encounter during regular operation.