What are the advantages of using the PLAN23 flushing scheme for boiler forced circulation pumps?
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Recently, the mechanical seals of medium-pressure boiler forced circulation pumps have been prone to leakage. The main reason is that the sealing rings of these seals do not have good heat resistance, which leads to cracking and deformation, resulting in the failure of the seals. It is possible that the flushing cooler is blocked, preventing the flushing water from cooling properly. However, for the sake of ease of maintenance, the mechanical engineers insist on removing the flushing cooler. What are the advantages of using the PLAN23 flushing method for boiler forced circulation pumps?
The original poster didn’t express themselves clearly; were they asking about the function of the cooler? Still, why is Plan 23 being adopted?
The cooler cannot be removed; otherwise, it will not just be the sealing ring that ages – the sealing surfaces of the mechanical seal will also suffer from dry friction damage
Yes, ours is PLAN23+62. In model 62, circulating water is used for external flushing. Since the valve opening is relatively small (if it’s opened too wide, the circulating water leaks directly from the pump seals; this is good for protecting the seals, but it hinders clean production on site), scaling in the circulating water can cause blockages, leading to seal failure. . . . . .
The PLAN23 scheme is mainly suitable for operating conditions with high temperatures and low viscosity, and is used for single-face mechanical seals. Its advantage is that, as the liquid circulates in a closed loop within the sealed chamber, less heat is generated, making it easier to lower the temperature of the flushing fluid. The downside is that if the seal itself is not well designed, or if the piping setup does not meet the requirements, there may be poor circulation and a weak cleaning effect. As for scaling inside the heat exchanger, it is a problem with the quality of the circulating water.