What is the correct first step in using the internal valve to remove product from a wheels-side MC-306/DOT-406 cargo tank?

The first step in using the internal valve to remove product from a wheel-side MC-306/DOT-406 cargo tank is to open the internal valve. This action is essential because the internal valve controls the flow of product from the tank to the discharge line. By opening the internal valve, you establish a pathway for the liquid to flow out, enabling effective and controlled transfer of the hazardous materials.

Handling hazardous materials requires maintaining control of the transfer process to mitigate risks such as spills or leaks. Opening the valve first ensures that the system is prepared for subsequent steps, such as draining or connecting discharge lines. It’s crucial to follow the correct sequence to prevent accidents and ensure the safety of the personnel and the surrounding environment.