To find information about the hazards of a product flowing through a control valve, a CST would consult?

Consulting the Material Data Safety Sheet (MSDS) is essential when assessing the hazards of a product flowing through a control valve. The MSDS contains valuable information regarding the physical and chemical properties of a substance, including its potential hazards, toxicity, handling guidelines, and emergency measures in the case of spills or exposure. This document is designed to provide safety information to ensure the proper handling and use of hazardous materials, making it the primary resource for understanding risks associated with specific products.

In contrast, the Instrument Index primarily provides details about instrumentation and control devices but does not contain specific safety information about the materials themselves. The NEC Article 500 pertains to electrical safety in hazardous locations but does not directly address the safety of products flowing through control valves. Finally, the Specification Form typically outlines the design requirements for equipment but does not focus on material safety and hazards. Thus, the MSDS is the most appropriate source for understanding the hazards posed by products in a control system context.