CDL Hazardous Materials Endorsement (HME)Loading and Unloading Hazardous MaterialsMedium
A technician is loading a portable tank containing Class 8 (Corrosive) material onto a flatbed trailer. What is the minimum number of tiedowns required to secure a portable tank with a capacity of 1,500 gallons?
- A6 tiedowns
- B2 tiedowns
- C3 tiedowns
- D4 tiedowns
Show answer & explanationAnswer & explanation
Correct answer: D. 4 tiedowns
For portable tanks with a capacity of 1,000 gallons or more, the Hazardous Materials Regulations (HMR) require a minimum of four tiedowns to secure the tank to the vehicle. This ensures adequate stability and prevents movement during transport, regardless of the specific hazard class.
Why the other options are wrong
- A. While more tiedowns can be used for extra security, four is the minimum regulatory requirement for this capacity.
- B. Two tiedowns are insufficient for portable tanks of this capacity.
- C. Three tiedowns are insufficient for portable tanks of this capacity.
Portable Tank Tiedown Minimums (Large Capacity)
Portable tanks with a capacity of 1,000 gallons or more must be secured to the vehicle with a minimum of four tiedowns.
- Tiedowns prevent shifting and overturning during transport.
- The number of tiedowns depends on tank capacity and weight.
- Minimums are specified in 49 CFR 177.834.
Memory trick: Big tank, 'four' strong ties to stay put.