Procedures required when the storage medium in an internal floating roof tank changes
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Dear sea friends: As the title indicates, these are the procedures that need to be followed when the medium stored in an internal floating roof tank changes. There is a floating roof tank that was originally designed to store flammable liquids of Class A and B, with a saturated vapor pressure of around 20 KPa. It is now intended to be used again for storing flammable liquids of Class A and B, but with a saturated vapor pressure of 40–60 KPa ； Question: What assessments are required? Can the feasibility report issued by the design institute be used as a basis?
I majored in process engineering, and it seems that according to the regulatory requirements, re-certification is necessary when the medium in use changes. You can ask the professionals in equipment-related fields
According to calculations by the design firm, changes in the medium density may affect the wall thickness, and increased pressure also requires further verification.
I have consulted with the design firm, and it was confirmed that the design follows Class A/B standards as well; there are no issues with the safety distances, and there is also no corrosivity involved, so the conditions for mutual installation are met. The only difference is that the critical storage quantities for different media vary, which can have a certain impact on the level of risk associated with the tank area. However, this impact isn’t significant, as both fall under Class A/B standards, so the difference isn’t that great. As for the issue of wall thickness and pressure you mentioned, there’s no problem – floating roof tanks can be used, and the pressure requirements will definitely be satisfied