Accurate Identification. Confident Compliance. Complete Records.
In-Gas Direct offers specialized nameplate verification services to help you accurately identify, document, and—when appropriate—correct nameplate capacities of gas-insulated equipment in accordance with the latest EPA Subpart DD regulations. Accurate nameplate data is essential for emissions tracking, inventory accuracy, and regulatory compliance. Our trained technicians conduct on-site inspections to locate, photograph, and record equipment nameplates, capturing key information such as make, model, serial number, gas type, voltage class, and manufacturer-specified nameplate capacity (NC).
With the 2025 EPA update to Subpart DD, facilities now have the option to measure and correct manufacturer-specified nameplate capacities for closed-pressure electrical equipment rated over 38 kV. This is particularly important because manufacturer nameplate values are often estimates and may not reflect actual gas volume capacity—leading to significant over- or underreporting of emissions. In-Gas Direct follows the full EPA-recommended protocol for measuring and verifying NC values, especially for newly installed or retiring gas-insulated equipment (GIE).
Our Process for Measuring Nameplate Capacity:
Initial Gas Inventory – Record the amount of insulating gas in the equipment at purchase.
Final Pressurization – Add gas to reach the manufacturer’s specified, temperature-compensated operating pressure.
Accurate Measurement – Use a calibrated flowmeter or weigh cylinders before and after filling (accounting for gas remaining in hoses).
Final Calculation – Add the gas added in Step 2 to the initial gas recorded in Step 1. This total is your measured NC.
According to EPA rules:
If the measured NC differs by more than 2% from the original manufacturer value, you must use the measured value.
If the difference is within 2%, you may use the original or measured value—but must apply the same rule uniformly to all similar equipment installed or retired in that year and beyond (i.e., no cherry-picking).
Each verification service includes a detailed digital report with nameplate photos, measured NC values (when applicable), and equipment identifiers that support your emissions reporting, asset tracking, and compliance programs.
Start your compliance process with confidence.
Contact us to schedule your nameplate verification service.
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