Boiler water pump broken shaft
Thread Content
The existing boiler water pump has a broken shaft, and the working conditions on site are:: The pump inlet pipe diameter is DN100, the medium is hot water, the temperature is 104 degrees, and it is connected to a deaerator. The height difference between the deaerator and the pump is 12 meters. The outlet pipe diameter is DN80. The new pump is put into use for about 30 hours. The motor power is 132KW. A frequency converter is used. The operating load at that time is 85%, and the pump outlet pressure is 4.0MPa. The shaft is broken at the coupling. Please friends, please analyze the reasons.
Provides shaft material. I can make this pump shaft.
18032233998 WeChat same number
Look at the cross section for rust. Did it have internal defects before, such as rust and breakage?
Materials and heat treatment issues. The shaft of the pump is generally made of 45 steel and undergoes quenching and tempering treatment. In pumps that transport weakly corrosive media such as salt solutions, the pump shaft material is 40Cr and quenched and tempered. For pumps transporting highly corrosive media such as acids and alkalis, the pump shaft material is generally stainless steel such as lCr18N19 lCr18Ni9Ti. Those with higher strength include 35CrMo\42CrMo, etc.
How wide is your outlet valve opening? How much traffic? What is the outlet pressure? The cross section looks a bit fatigue-damaged. What about vibration during pump operation? 1. It may be that the pump has been inflated for a long time. 2. Low flow rate and high head are too high. . .
The coupling is broken. From the photo, it does not look like new equipment. Although the running time is 30 hours, it is a set of equipment made of couplings from ordinary equipment, and the strength is not up to it.
The broken section of the shaft is rusty, it doesn't look like a new shaft.
It looks rusty, are you sure it was newly broken?
old equipment: The shaft has fatigue defects ； new equipment: Shaft quality issues