Centrifugal pump mechanical seals failure due to overheating, namely thermal damage failure, the most common thermal damage the aging face thermal deformation failure, loss of elastic thermal cracking, blistering scar, charring, elastic components, rubber parts, permanent deformation , cracks, etc.

Centrifugal seal face thermal deformation has local thermal deformation and overall thermal deformation. Seal end face of sometimes find many small hot spots and discoloration isolated area, indicating that the seal under high pressure and heat effect, local deformation distortion occurred; sometimes find the seal end surface of a discrete symmetry bright band, which is mainly It is due to the irregular cooling, causing the end face of the local thermal deformation. Sometimes found on the inside of the seal face wear is very serious, the greater the radius of the contact trace more shallow, until indiscernible. The inside edge of the seal ring side may appear crumbs and jump side of the phenomenon. When the shaft rotates, the seal leakage continued, and when the shaft is stationary, does not leak. This is because the sealing at work, sufficient cooling the outside, but the inside of the friction of heat, so the inside of the thermal deformation of the thermal deformation greater than the outside, the inside of the formation of the contact caused by thermal deformation (positive taper angle) end face.

Carbide, engineering ceramics, brittle materials such as carbon graphite seal ring, and sometimes there will be an end face of radial cracks, so that the sealing surface leakage increased rapidly, rapid wear of couplings, which are mostly due to the sealing surface in dry friction, cooled suddenly Friction causes interruption rapid accumulation of heat damage to the formation of a thermal failure.

In the high temperature seal environment, often find that the surface of the graphite ring pits scar blocks. This is because when the resin-impregnated graphite ring exceeds the allowable temperature, the resin is carbonized decompose to form volatiles durum and precipitation, the formation of scar, which greatly increases the friction, and surface damage with high leakage.

High temperatures may reduce the elasticity of the elastic element, so that the closing force of the seal faces shortage caused the seal faces serious leak. High Temperature Metal Bellows loss bomb that is a common kind of mechanical seals and typical failure modes. Effective way to avoid the emergence of such failure is a reasonable choice of bellows material and its proper heat treatment.

High temperature rubber seals aging, cracking and permanent deformation of an important reason. Rubber aging, the performance of rubber hard, strength and elasticity, there will be severe cracking, resulting in the loss of sealing performance. In the high temperature fluid, the rubber ring is dangerous to continue curing eventually it loses its elasticity and leak. Among a long period of high temperature seal, it will become the same as the shape of the trench, when the temperature is kept constant, but also acts as a seal; but when the temperature decreases, the seals will soon shrink and leak leak path is formed. Therefore, we should pay attention to the various types of plastic temperature, and should avoid prolonged use in extreme temperatures.

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