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Impact of 4-Bar Nitrogen Stroke via 30-Inch Line into Low-Level Mogas Tank with IFR

Kazim Raza

Petroleum
Apr 25, 2025
1
The tank is equipped with an Internal Floating Roof (IFR). The critical zone for the IFR is between 1400 mm to 1750 mm, and at the time of the nitrogen stroke, the product level was only 1300 mm — meaning the IFR was likely resting on its legs. The nitrogen stroke was done at 4 bar, and the product volume inside the injection line was approximately 45 cubic meters.

Would this injection pose a mechanical or sealing risk to the IFR, especially since the roof was not yet floating? Could it potentially cause seal lifting, rim seal damage, or plate flexing due to gas movement or pressure impact from beneath the IFR?
 
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What exactly is a "Nitrogen stroke"?

Without knowing more details I would say yes to all of concerns.

IFRs are normally quite lightweight and no floating roof like gas suddenly appearing where liquid should be.
 

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