Analysis of typical failure of the mechanical seal

General analysis of the mechanical seal common seal failure cause is usually experienced after analysis using derived through the process .
a. seal working gas shock ( splash and sputtering ) .
b. seal leakage and Grand icing .
c. steady drip sealing surface .
d. working seal screaming.
e. Gran outer ring graphite powder build-up.
f. pump and ( or ) axis vibration .
g. seal life is short.
Typical mechanical seal failure
General analysis of the mechanical seal common seal failure cause is usually experienced after analysis using derived through the process .
a. seal working gas shock ( splash and sputtering ) .
b. seal leakage and Grand icing .
c. steady drip sealing surface .
d. working seal screaming.
e. Gran outer ring graphite powder build-up.
f. pump and ( or ) axis vibration .
g. seal life is short.
Vaporization ( flash )
When the sealing surface friction heat accumulation , the end faces of the occurrence of local film boiling .
Symptoms seal pronunciation or take gas ( intermittent shock ) . Stationary ring bitten eclipse , comet -like texture generating process leads to a narrow ring outer edge trimming . Hard rings of thermal cracking . End at the inner edge of graphite dust accumulation .
Corrective measures checking seal design parameters ; improve circulation conditions .
Dry Running
Face between the liquid insufficient or no liquid.
Symptoms are severe wear stationary ring and groove . Hard surface polished ring marks, or radial cracks ( thermal cracking ) and discoloration. Aprons sclerosis. There LP graphite ring -shaped grooves.
Corrective measures chosen balanced seal ;releasable cable ties choose high thermal conductivity of rigid material ; Inspect the exhaust situation ; improve circulation conditions .
Blister scars
Between the end faces of the high viscosity fluid shear stress exceeds the breaking strength of the graphite . When the pump stops , the temperature drop of liquid viscosity increases so that the pump restart problems.
Symptoms of carbon graphite particles emerge from the end face ; hard ring with polished traces ; tiny gap in the residual graphite particles.
Corrective Action Check the loop condition ; using 15 ~ 30min ※ steam preheat or low pressure steam heat .
Abrasive wear
Grinding medium containing solid particles.
Symptoms of solid particles or residues accumulate in the face and tiny gaps , etc..
Corrective measures as using resistant material end ; improve cycling conditions : hydrocyclone , external cleansing rinse ......
Face deformation
Symptoms pump starts ,high security cable seals the seal leakage and leakage occurs over time. Will face light research on the platform , there are signs of deformation .
Corrective measures natural aging deformation, reground ; improper assembly , carefully re- assemble ; pump pair bad , bearing damage , adjust pump .