Cylinder Tare-Weight Loss Can Stop a Refill Before It Starts

The Situation

A cylinder that appears usable at the fill station may already require action under the hazardous materials rule. The calendar requalification date is not the only screen. Cornell’s published text uses an at-any-time standard for the listed damage conditions and for a loss of at least 5 percent of official tare weight. That makes the fill-station check a decision point before the cylinder is refilled or offered for transportation.

The Facts

Cornell’s text of 49 CFR 180.209(c) applies to a DOT 4-series cylinder except a 4L cylinder. The source says the cylinder must be requalified before being refilled and offered for transportation if it shows evidence of a leak, internal or external corrosion, denting, bulging, or rough usage to the extent that it is likely to be weakened appreciably. The same paragraph applies when the cylinder has lost 5 percent or more of its official tare weight. The source refers readers to CGA C-6 or C-6.3 regarding cylinder weakening. After testing, the actual tare weight must be recorded as the new tare weight on the test report and marked on the cylinder, according to Cornell’s quotation of 180.209(c). The previous tare weight must be strike-lined through but not obliterated. The supplied article illustrates the calculation with an official tare of 20 pounds and a scale reading of 19 pounds, which represents a 5 percent loss; that example comes from the stored article, not from the published rule. A reading of 19.2 pounds against a 20-pound official tare does not reach 5 percent, according to that stored example. The source also distinguishes the at-any-time condition in paragraph (c) from the periodic intervals in Table 1. A cylinder inside its calendar interval can still require requalification when paragraph (c) applies. The stored article says visual requalification under 180.209(g) is a separate task for a person with a current RIN and should not be treated as an informal route-technician glance.

Business Impact

The direct operational effect is an interrupted refill and a cylinder that must be held for the appropriate qualification decision. The stored article does not establish the cost of a condemned cylinder, a customer delay, or a failed inspection, so those consequences should not be assigned a dollar value from this source. It does establish that filling first and weighing or inspecting later reverses the required sequence.

Key Takeaways

• Cornell’s text of 49 CFR 180.209(c) requires requalification before refill when a covered 4-series cylinder has lost at least 5 percent of official tare weight.
• The same paragraph covers specified leaks, corrosion, dents, bulges, and weakening rough usage, regardless of the calendar interval, according to Cornell.
• After testing, the actual tare weight must be recorded and marked as the new tare weight, while the prior mark is strike-lined rather than erased.
• The paragraph expressly excepts a 4L cylinder from its DOT 4-series rule.

Action Steps

1. 1.Place the official tare mark and the scale reading together on the fill-station record before deciding whether to refill, following 49 CFR 180.209(c).
2. 2.Hold any covered cylinder showing the damage conditions named by Cornell until the required qualification decision is made.
3. 3.After testing, record and mark the actual new tare weight and strike-line the prior mark without obliterating it, as required by 180.209(c).
4. 4.Review the cage for questionable tare marks and route the unresolved cylinders to the person responsible for requalification records.

Competitive Advantage

The operational advantage is a consistent hold decision at the fill station. The stored source does not prove that weighing reduces costs or improves retention, but it gives an operator a defensible sequence: inspect, compare the official tare, and qualify before refill.