Pillar
A tight tank keeps fuel from leaking in or out. The tightness test proves it with a measurable number, not a visual inspection, and it is the basis of the certification the Fire Department requires in Panama. Here we gather how the MESA 2D test works, when each method applies, and what to do when a tank fails.
A tight tank keeps fuel from leaking in or out. It sounds obvious, but it is the condition that separates a compliant station from one that risks a fine, soil contamination, or a fire. The tightness test proves it with a measurable number, not a visual inspection. In Panama that test is the basis of the certification issued by the Fire Department (DINASEPI); without it, a station is not in order.
A tank is not declared tight because "no leaks are visible." It is declared tight when the test measures a loss below 0.10 gallons per hour, the international precision threshold used by the EPA 40 CFR 280 and PEI references. That number is small on purpose: a micro-leak of less than a gallon per hour, sustained over time, contaminates the soil and can go unnoticed for months.
The technology we use is MESA 2D. Instead of looking at the tank, it measures the variation of pressure and level inside it under controlled conditions, and separates the product's thermal evaporation from an actual leak. That distinction is the key: a tank can lose volume due to temperature without having a single leak, and a method that does not compensate for that produces false positives. The result is a measured value compared against the threshold. It passes or it does not, with the number to back it.
The framework is Law 10 of 2010, which gives the Fire Department authority over fire safety, with a technical basis in the NFPA 30 and NFPA 30A codes. The tightness certification must be kept current to operate; the renewal cycle is set by the regulation.
Failing is not the end, it is the start of a protocol: identify the likely source of the loss (the tank, a line, a dispenser seal), fix it, and test again. A tank that does not comply should not be operated. The risk is not only the fine, it is the contamination and the safety.
We are members of the Petroleum Equipment Institute (PEI) and have spent 47 years testing and certifying stations in Panama, with more than 17,000 service orders completed. We run the MESA 2D test, deliver the report with the measured value, and, when needed, do the diagnosis and remediation so the tank passes.
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