After replacing the mechanical seal in a multi-stage double-support horizontal centrifugal pump, are there sharp whistling sounds of varying intensity at both ends where the mechanical seals are located?
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All other parameters of this pump are normal, and the mechanical seals on both ends show no leakage; it can be put into use normally. Could someone please advise on the cause of this whistling sound?
The key points for installing a mechanical seal relate to the two static sealing points between the rotor and the stator. A certain level of smoothness is required to ensure long-term use. If possible, it is recommended to reinstall.
Why so sure? It might not be the sound coming from the mechanical seal.
The whistling sound only appears after replacing the mechanical seal!
Check the sealed flushing pipeline; if it features double-end sealing, examine whether there are any changes in the sealing structure, especially to see if there are issues with the pump efficiency ring inside.
Frictional noise at the machine seal end face may be caused by uneven compression or minor defects on the end face
Are all the sealing surfaces made of cemented carbide? If the pressure is too high, a sound is produced when the specific pressure is high. I’ve never encountered any harsh noises with graphite
It is caused by air remaining inside the sealing gland. When flushing the system with buffer solution, fill it up a bit first; this should be sufficient to fill that part inside the sealing gland. After turning the shaft, release the air and then fill it to the specified level in the buffer tank
The medium has a high temperature or is prone to vaporization; cavitation and pumping loss occur during the operation of the pump. Or, due to high sealing compression and high temperatures, the liquid film on the sealing surfaces of the rotating and stationary rings vaporizes, resulting in friction between these surfaces and the generation of noise
Running normally! If the friction between the stationary and rotating rings of a mechanical seal isn’t instantaneous, wouldn’t it cause damage right away?