Mechanical seal cooling
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What are the cooling conditions for the mechanical seal of a centrifugal pump? Are there any requirements for the cooling water volume? Is it possible to operate without cooling water? At what temperature of the pump medium is cooling water not required?
A video should be sent to take a look at the appearance and classify them into types. It is recommended that, if one is not a designer, it is best to strictly follow the operating procedures specific to this role as required. Question 1: The conditions for cooling the mechanical seal are to meet the relevant material requirements; if those conditions are not satisfied, the seal will be damaged. The most basic requirement should be a pure liquid free of impurities at a certain temperature ； Question 2: The amount of cooling water is simply sufficient to carry away the heat generated by friction; this net amount of water can be located on the side of the sealing gas or in a separate chamber. There is no need for manual control of the flow rate – it is sufficient to maintain the appropriate pressure. This applies only to sewage pumps, slurry pumps, and other equipment with special requirements. Question 3: The relationship between the medium temperature and this cooling water is that, as long as the medium temperature does not cause deformation or damage to the seal rubber, keeps it clean and free of impurities, and does not cause any damage to the seal, there is no need to use cooling water for cooling.
Prevent medium deposition and coking, cool mechanical seals, P62
In some cases, cooling water is not necessary, such as with plain water at room temperature
If water conservation is a concern, it can be appropriately controlled based on the temperature of the cooled water outlet. [This is just personal opinion.]
Cooling for mechanical seals is generally used in high-temperature conditions or when there is a risk of vaporization; the specific approach depends on the actual situation. The options 21, 23, and 32 in API682 can serve as a reference
Water-cooled machine seals are usually equipped with a water nozzle device; if water cooling is not used, they are essentially no different from ordinary machine seals. If the operating conditions do not provide tap water or return water, it is recommended to avoid using a water-cooled seal; instead, consult the manufacturer regarding alternative types of seals. There are no specific requirements regarding temperature; the main issue is the particles generated during the operation of the mechanical seal, or the conversion of kinetic energy from high-speed rotation into heat energy, especially when the machine is running idle.