After arriving at the site, ask the owner to start the pump, and the test noise value is 84dB, as shown below (the surrounding environment is quiet). Vibration value The vibration of the motor base is 3.0mm/s(axial and radial direction), the vibration of the pump bearing box is 6.3mm/s(axial and radial direction), and the vibration of the motor driving end is 8.5mm/s(radial direction).
2）检查泵与电机联轴器，轴向与径向对中均符合要求。泵手动盘车，很灵活，无卡阻现象。
Check pump and motor couplings, axial and radial alignment meet the requirements. Pump manual turning, very flexible, no stuck phenomenon.
When the #4 pump is stopped, the #3 pump next to it is started. The noise value of #3 is 74dB, and the vibration is within 4.5mm/s. It is strange that the vibration is strong when touching the bearing chamber of #4 pump by hand. The measured vibration value is 5.7mm/s (Figure 1 below). Shut down pump #3 and eliminate the vibration of pump #4. Similarly, when the #2 pump, which is slightly away from #4, is started, the vibration value of the bearing chamber of #4 pump, which is shut down, is actually 2.6mm/s (Figure 2 below).
4）四台立式泵现场分布照片如下图，白色为逆止阀：
The field distribution photos of four vertical pumps are as follows, and the white is the check valve:
No. 4 pump outlet check valve, there is a situation of lax closure, when #4 stop, next to #3 pump, #2 pump started, #4 pump outlet pipeline reflux situation.
2，单独运行#4号泵时，由于出口阀门的缘故，存在出水不通畅情况。故泵组噪音与振动偏大。
When No. 4 pump is run alone, the water is not unobstructed due to the outlet valve. Therefore, the noise and vibration of the pump group are large.
3，请客户检查#4号出口管路逆止阀是否有卡异物，或者阀门出现磨损或故障的情况。
Please check whether the No. 4 outlet pipeline check valve has any foreign body stuck, or the valve is worn or faulty.
