Shell Heat Transfer Fluid S2X

Yes — Shell Heat Transfer Oil S2 X is the renamed successor to Shell Thermia C. The product itself is a premium heat transfer fluid for indirectly heated closed systems, so existing Thermia C users can reference this as its current name.

Shell Heat Transfer Oil S2 X is formulated specifically for indirectly heated closed heat transfer systems. It is not intended for direct-fired or open systems.

Extended oil life depends on efficient fluid heating and good pump circulation being maintained so that film temperatures on the heater surface do not exceed specified limits. The highly refined mineral oil base and built-in oxidation inhibitor help the fluid resist cracking, oxidation, and thickening under those conditions.

Shell Heat Transfer Oil S2 X has high solvency, which holds oxidation products in solution rather than allowing them to settle out. This reduces deposit formation and helps keep the internal surfaces of heat exchangers clean.

The low vapor pressure helps the fluid resist cracking, which minimizes the formation of volatile decomposition products. Any volatile products that do form can be recovered through an expansion chamber and condensate collector, keeping the system operating efficiently.

Low viscosity gives Shell Heat Transfer Oil S2 X excellent fluidity, which supports effective heat transfer and smooth pump circulation across a wide temperature range — both of which are important for maintaining system efficiency and protecting against overheating at heater surfaces.