What faults can occur if the cooling medium used for the gland is not selected properly?

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There are many types of cooling media used for gland sealing (commonly referred to as quenching or back cooling). Pumps with moderate temperatures are commonly cooled by water. There are three types of cooling water used in factories: fresh water, recycled water, and softened water. For normal-temperature pumps, fresh water and softened water can be used as quench water; for bellows seals used at lower temperatures, fresh water is the best choice. If recycled water is used, impurities such as scale will accumulate over time between the bellows, reducing their compensatory capacity. For pumps operating at higher temperatures, if fresh water and circulating water are used, scaling between the shaft sleeve and the rotating ring can cause the rotating ring to get stuck, and no compensation is possible. At the same time, grooves are ground on the inner diameter of the sealing end face of the static ring. Softened water is used as quench water in high-temperature pumps. For pumps that operate at high temperatures and have high medium viscosity, such as the bottom pumps of the atmospheric distillation column and the vacuum distillation column in refinery atmospheric and vacuum distillation units, an additional medium must be used as a cooling medium for the seals. If softened water at room temperature is still used, the accumulated leaked fluid can clog the drainage pipes; in such cases, softened water at 80-90°C or water vapor at 0.3 MPa should be used.