What 178.345-11(b) means in plain language
FMCSR 178.345-11(b) governs the condition and function of valves on DOT406, DOT407, and DOT412 specification tank trucks. These tank trailers carry hazardous liquids and gases, and their valves are critical safety equipment—they control flow, prevent leaks, and protect the cargo and public during transport.
When an inspector cites you for 178.345-11(b), they've found a defect with one or more of these valves. That might mean a valve is damaged, leaking, corroded, stuck, misaligned, or missing entirely. It could also mean a valve wasn't properly secured, was the wrong type for the tank, or wasn't functioning as designed. The specific nature of the defect will be noted on your citation form.
This is a hazardous materials regulation, so inspectors take valve defects seriously. Even a small leak or a valve that doesn't seal fully can release toxic cargo during transport, posing risk to you, your cargo, other drivers, and communities near the road.
What our enforcement data actually shows
Across our 13 million+ inspection records, 178.345-11(b) has been cited 20 times all-time, with 0 citations in the last 12 months and 0 in the last 90 days. This makes it ranked #1938 of 3,036 FMCSR codes by citation volume—very rarely enforced.
Of those 20 all-time citations, 5 resulted in out-of-service orders and 15 did not, yielding a 25.0% out-of-service rate. For context, the average out-of-service rate across all FMCSR codes is 31.4%, meaning this code's OOS rate runs slightly lower than the national average. You were not placed out of service in 75% of cases where this code was cited.
Because enforcement volume is extremely low in recent months, this citation suggests either that the defect was caught early during a routine inspection, or that your vehicle presented a clear and immediate hazard that triggered a more detailed hazmat check.
Who gets cited most
Our inspection data does not identify citations by state for this particular code due to its low enforcement volume. However, across the all-time 20 citations, several carriers appear in our records with multiple citations. Our data shows fleets such as Paisan Logistics LLC and Transportes Refrigerados GC Xpress SA de CV, each with 2 citations on record. This does not imply negligence on their part—rather, it reflects the fact that fleets operating hazmat tank equipment nationwide encounter inspectors regularly, and any valve defect, however minor, gets flagged.
The vehicle makes cited most often include trailers branded PTRB (3 citations), and Fruehauf (FRHT) and Heil models (each 2 citations). These are common tank-trailer manufacturers, suggesting the issue is spread across equipment types rather than concentrated in one brand.
How severe is this compared to similar codes
178.345-11(b) sits in the hazardous materials category alongside several other high-stakes violations. For comparison:
- 177.834A-HMC (general loading/unloading hazmat) has been cited 3,954 times with a 99.2% out-of-service rate—far more frequent and almost always results in immediate removal.
- 177.817(a) (placarding violation) has 2,274 citations with a 75.1% OOS rate—three times more common than 178.345-11(b) and more likely to trigger an out-of-service order.
- 172.602(c)(1) (maintenance/accessibility of emergency response info) has 1,464 citations but a 0.0% OOS rate—very common but rarely results in out-of-service status.
Your citation is rarer and slightly less likely to result in removal than the average hazmat violation, but it still touches on cargo safety in a direct way.
How to avoid it
Tank valve defects are preventable with diligent pre-trip inspection and maintenance discipline:
- Walk around your entire tank trailer before every load. Look for visible leaks, cracks, corrosion, or misalignment around all valve connections. If you see liquid weeping from any valve port, stop and report it to your carrier or supervisor before you move the trailer.
- Check that all valves are present, secure, and properly labeled. Don't assume a valve that looks fine is fine—gently try to move it by hand (if safety-rated and accessible) to confirm it's not stuck or loose. Missing or illegible valve labels are also a violation.
- Know which tank type you're hauling. DOT406, 407, and 412 tanks have specific valve requirements. If you're unsure whether your equipment is compliant, ask your dispatcher or safety manager before departing. Swapping trailers or using equipment you're unfamiliar with raises your risk.
- Report any valve damage immediately. If you hit a pothole, scrape against a loading dock, or notice a leak during transit, contact your carrier at the next safe stop. Do not try to repair or jury-rig a valve yourself—these are engineered safety devices that require certified repair.
- Perform scheduled maintenance on time. Your fleet should have a preventive maintenance schedule that includes tank valve inspection and replacement. Meet those intervals. Valves degrade over time, especially if exposed to chemicals or temperature extremes.
- Keep your tank trailer clean and dry. Corrosion eats valves. Rinse your trailer after hauling corrosive loads, and inspect the valve area regularly for rust or pitting.
Most importantly: a valve defect citation is a message that your equipment or your inspection routine needs attention. Work with your safety department to understand what the inspector found and why, then verify the repair before you haul hazmat again.