Compressed Natural Gas (CNG) Certification Practice Exam

The purpose of the automatic shutdown control on unattended Compressed Natural Gas (CNG) compression equipment primarily centers around ensuring safety. This feature is critical in monitoring various system parameters and quickly identifying any anomalies that could pose risks, such as gas leaks, equipment failures, or other hazardous conditions.

When an unattended compression system operates without constant human monitoring, an automatic shutdown mechanism serves as a vital safety measure. If it detects conditions outside of the predetermined safe operating range—like excessive pressure, temperature fluctuations, or operational malfunctions—the control system can automatically halt the equipment to prevent accidents or catastrophic failures. This is especially important in environments where human presence is minimal, as it reduces the risk to personnel and secures the integrity of the facility.

While saving energy, preventing overheating, and regulating pressure are relevant operational considerations, they are secondary to the overarching aim of preserving safety in CNG operations. Thus, the automatic shutdown control is primarily designed with hazard prevention as its critical function.