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27 Nov Relationship Between Fluid Quality & System Safety

Heat transfer fluid has properties of high efficiency, less heat loss, even heating and easy control of temperature. More and more heat transfer fluid boilers are used in various kinds of fields with the rapid development of domestic economy. A lot of fluid manufacturers are emerging as the demand of heat transfer fluid increases hugely. But fluid quality is mixed due to the low industrial standard.

Market fluid quality is mixed and the difference between good and bad fluid is large, adversely affecting heat transfer fluid system operation safety. Although some products both meet the company and industrial standards, their thermal stability and oxidation resistance are poor, causing fluid thermal cracking and shortening fluid service life. Inappropriate operation of heat transfer fluid system causes fluid degradation, coking and pipeline overburning, influencing operation safety and even triggering fire hazard. Good fluid quality and appropriate operation are the key to run heat transfer fluid system safely and efficiently. Expert from Schultz Chemistry said fluid acid value, flash point, carbon residue and kinematic viscosity are the crucial properties in choosing fluid.

Acid value refers to the content of organic acid in fluid, which is the total quantity of potassium hydroxide consumed by every gram of fluid. When fluid temperature is ≤100℃ and without moisture, it barely has corrosion to system equipment; and when the temperature is over 100℃, fluid corrosion increases with temperature climbing. Meanwhile, organic acid accelerates fluid degradation generating more acid substances and aggravating fluid corrosion further. Choosing fluid with low acid value can lengthen fluid service life and reduce equipment damage.

Thermal stability is the important factor to judge fluid quality and also indirectly affects fluid acid value, flash point, carbon residue and kinematic viscosity. Fluid causes thermal cracking under high temperature due to oxidation and overheating. The degradation rate of good fluid is very slow under appropriate operation. But fluid degradation rate increases rapidly when temperature is climbing with inappropriate operation and unqualified fluid. Fluid thermal cracking generates low molecular organic substances which decreases fluid flash point and viscosity. But some low molecular substances polymerize, generating high molecular organics which increases fluid flash point and viscosity again. Generally, the variation of fluid flash point and viscosity is subtle, but fluid acid value and carbon residue increases after operation.

Fluid carbon residue, viscosity and acid value increase significantly when fluid degrades severely. Compared to synthetic fluid, thermal stability of mineral oil is worse as its chemical structure is mainly straight-chain paraffin which is easily ruptured in high temperature. But some domestic fluid manufacturers overstate their products with good thermal stability, oxidation resistance, suitable viscosity and no coking, misleading customers and causing fluid degradation in short time and even triggering safety accident.

Except for fluid quality, customers should know about their in use fluid. Oxidation and overheating are key factors affecting fluid property. Fluid service life is shortened greatly and even reach the scrapping standard in short time without avoiding these two problems, causing great economic loss. Besides choosing high quality fluid, customers should operate system in strict accordance with regulations.

Customers should avoid fluid contamination during transportation and filling system. Fluid contamination is a very common problem. System is not cleaned completely after installation, leaving welding slag and rust. Water is not drained completely after system cleaning and pressure test. Wasted fluid is still left in system in the process of changing fresh fluid. All these situations will cause fluid contamination. Users should take measures to avoid fluid contamination in fluid storage, transportation and filling.

Choosing premium fluid manufacturer is the crucial guarantee of system long term safe operation. Schultz Chemistry provides customers various high quality fluids and also offers 360 dimensions and whole life cycle service during pre-sales, medium-sales and after-sales. Our high quality products and great service win the customers trust and develop China heat transfer fluid.