Why Mechanical Seals Cannot Function Without Auxiliary Support Systems & Various Seal Failures Caused by Missing Support Systems
 
I. Four Core Functions of Mechanical Seal Auxiliary Support Systems
 
Mechanical seals rely on a micron-thick lubricating fluid film formed between rotating and stationary faces to achieve sealing. The seal faces operate under harsh service conditions,

constantly exposed to frictional heat, solid contaminants, medium vaporization and crystal precipitation. The process medium alone cannot maintain a stable working environment, which

is why auxiliary support systems deliver four critical protective functions for mechanical seals:
 
1. Heat Removal & Temperature Control
 
High-speed relative movement of mating seal faces generates continuous frictional heat. Accumulated heat ruptures the thin lubricating film and hardens or embrittles rubber elastic

components under sustained high temperatures. Overheating and vaporization of process medium inside the seal chamber will tear the fluid film completely, leading to dry friction

between seal faces and rapid burning damage of seal rings. Auxiliary systems circulate barrier, buffer or flush fluids to continuously carry away frictional heat and stabilize operating

temperatures within the seal chamber.
 
2. Lubrication & Maintenance of Continuous Fluid Film
 
An intact fluid film across seal faces is the fundamental prerequisite for reliable mechanical seal performance. The lubricating film can be easily damaged if the process medium vaporizes

at high temperatures, features excessively low viscosity, or contains hard solid particles. Flush, buffer and barrier systems deliver consistent, clean auxiliary fluids to maintain an unbroken

lubricating film on mating seal surfaces at all times.
 
3. Isolation & Blockage of Hazardous Process Media
 
For double mechanical seals handling toxic, highly volatile, flammable, explosive or strongly corrosive media, auxiliary fluid inside buffer or barrier systems creates an isolating barrier

layer. Even if minor leakage occurs at the inner seal, the process medium will never reach external compensation components including springs, bellows and O-rings, thus preventing

component corrosion and coke buildup failure.

For single mechanical seals fitted with external or internal recirculation flush plans, full medium isolation is not achievable. Nevertheless, flush fluid dilutes highly corrosive substances

within the seal chamber and slows down corrosion progression effectively.
 
4. Flushing Purification & Prevention of Crystal Deposition
 
Constant flowing auxiliary fluid directly washes the seal face zone to sweep away solid particles, precipitated crystals and viscous residues, eliminating abrasive scratching of sealing

surfaces caused by solid contaminants. Closed-loop self-circulation systems equipped with surge tanks continuously circulate barrier fluid to prevent long-term accumulation of crystals

and debris, which would otherwise lock rotating seal rings and jam flexible compensation assemblies.

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