Which standard outlines the general pressure relief device standards for compressed gases?

The correct choice is ANSI/IAS PRD 1, as this standard specifically provides guidelines and requirements for pressure relief devices used in the handling of compressed gases. These devices are critical in maintaining safety and preventing overpressure situations, which can lead to catastrophic failures.

ANSI/IAS PRD 1 outlines specifications for design, performance, testing, and installation of pressure relief devices, ensuring that they operate effectively in various conditions to safely relieve excess pressure. Proper adherence to this standard is essential for organizations that deal with compressed gases to mitigate risks associated with pressure buildup.

In contrast, the other standards mentioned may cover different aspects of safety or regulatory compliance, such as CGA S-1.1, which pertains to pressure and leak testing but does not focus explicitly on pressure relief device standards. Similarly, 49 CFR 571.304 deals with motor vehicle safety standards, and ANSI/CSA PRD 1b focuses on different standards that are not as specific to compressed gas relief devices as the ANSI/IAS PRD 1 does. Understanding and applying the correct standards for pressure relief devices is crucial for the safe operation of CNG systems in the industry.