Tanker · Baffled, Un-baffled, and Compartmented Tanks

Federal regulation defines both "bulkhead" and "baffle" for cargo tanks. What separates the two?

1.A bulkhead is a liquid-tight transverse closure that separates compartments; a baffle is a non-liquid-tight transverse partition that slows liquid motion without stopping itCorrect answer

2.A bulkhead runs lengthwise down the full length of the tank from end to end, while a baffle instead runs crosswise, across the width of the tank

3.Both are liquid-tight, and the only difference is that a bulkhead is welded in place while a baffle is simply bolted in and easily removable

4.A baffle is liquid-tight and a bulkhead is the one with holes in it, which is supposedly why a baffled tank surges less than an un-baffled one

Explanation

In the regulation's own definitions, a bulkhead is a liquid-tight transverse closure at the ends of or between cargo tanks, while a baffle is a non-liquid-tight transverse partition device that deflects, checks, or regulates fluid motion in a tank. Liquid tightness is the whole distinction, and it is what makes the two behave differently in service: a bulkheaded tank is effectively several separate tanks that are loaded and unloaded individually, whereas a baffled tank holds one body of liquid that is slowed as it passes through rather than stopped. Both definitions are written for DOT specification cargo tanks and use the word transverse, across the tank, so neither is distinguished by its orientation. The wrong options swap the two definitions outright, make both liquid-tight and reduce the difference to how the part is fastened, or invent a lengthwise-versus-crosswise split that neither definition supports.

Source: 49 CFR 178.320(a)

Drill Baffled, Un-baffled, and Compartmented Tanks questions

Federal regulation defines both "bulkhead" and "baffle" for cargo tanks. What separates the two?

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