Plan21+53B or Plan23+53B
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Dear seniors, is the flushing method of this machine seal Plan21+53B or Plan23+53B? The appearance looks like Plan21+53B, but the final data of the pump says Plan23+53B.
This is 21+53B. The flushing fluid enters the sealing chamber through heat exchange from the pump outlet.
Now there is serious scaling in the water cooler. The working condition is 200℃. Is it more reasonable to choose 23?
Plan23 may be a bit difficult to arrange for this pump. If scaling is serious, the main considerations are whether the scaling coefficient of the water is large and whether the heat exchange area is sufficient. The flow rate of cooling water is generally 1.5-2.5m/s, the cooling water inlet is 32°C, the maximum return water temperature cannot exceed 49°C, and the maximum temperature rise of the cooling water is 17°C. The plan21 solution requires a flow-limiting orifice plate with a minimum diameter of 3mm. If the flushing flow rate is large, it will inevitably increase the load on the heat exchanger. The load of the heat exchanger in Plan 23 is small.
The flushing plan is Plan21+53B. For heat exchangers above 150°C, it is recommended to use softened water, otherwise it is easy to scale.
Our previous one was also changed to demineralized water, including machine seal cooling water.
The difference between 21 and 23 is that the heat exchange load is different.
Is the orifice plate located before the inlet of the heat exchanger or at the outlet?
The location of the orifice plate should be far away from the sealed flushing port. For example, if PLAN11 goes from the pump outlet to the seal chamber, the orifice plate should be connected close to the pump outlet. Being close to the sealing end cap can easily cause turbulence of liquid entering the sealing chamber.
Orifice plates are added to the inlet side of the heat exchanger.
If the speed is lower than 1500rpm, it is not suitable to choose PLAN23.