Tham khảo tài liệu 'know and understand centrifugal pumps episode 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Know and Understand Centrifugal Pumps Concentricity of seal chamber to shaft 005 TIR Maxima Figure 14-24 Install the pump back plate and seal chamber assembly. Mount the dial indicator on the shaft and place the needle onto the outer diameter of the lip or face of the seal chamber Figure 14-24 . An alternate method would be to place the indicator needle inside the seal chamber bore. Rotate the shaft. This will verify7 that the shaft is concentric with the seal chamber bore. If it is not concentric the seal may rub against the bore when the pump is started. With the indicator still in this same position place the needle onto the lip or face of the seal chamber Figure 14-25 . Rotate the shaft. This Figure 14-25 224 Failure Analysis of Mechanical Seals will verify the perpendicularity of the seal chamber to the shaft. If the chamber is not perpendicular to the shaft the seal s faces and springs will have to flex twice with every revolution to maintain contact. This will lead to fretting corrosion a damaged pump shaft or sleeve and rapid failure of the seal. 225 Common Sense Failure Analysis Pump maintenance files In most places the available information about any pump such as the manufacturer year of purchase model and serial number is placed in a file for general accounting purposes. In other plants such as a manufacturer the model lubricant and lubrication frequency is placed in a lubrication schedule. In cither case additional key information can be stored with a little more effort. The complete maintenance record of a pump when filed in an accessible available place is a valuable tool for diagnosing problems ordering parts for repair and establishing lubrication and maintenance schedules. Also these maintenance files are valuable in determining the performance of the pump during process changes. The comments on the work orders such as the list of materials or parts used can define a good preventive frequency a predictive and or a planned maintenance repair. .
