Cracking of the pump cover on the alkaline diaphragm metering pump
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This post was last edited by zzlwqj on 2018-4-20 at 14:27. It deals with a pump used for preparing alkaline solutions: a 10% NaOH solution at room temperature, with an outlet pressure of 2.0 MPa. The pump is a diaphragm metering pump manufactured by Nikkiso; it was installed and put into use in 2007. The material of the pump cover is 316 stainless steel. Recently, a longitudinal crack was found at the center of the pump cover, as shown in the image. I would like to ask experts what could be the cause?
There are many reasons. Life span, pressure, materials. And other such aspects. Your photo isn’t very clear. . .
It could also be a problem with the quality. You can contact the manufacturer for assistance in analyzing it.
The quality of Nikkiso metering pumps is excellent. It might be due to improper use or the age of the item. Material selection issue.
It has been in use for a long time; what is the frequency of use? But normal damage?
Their after-sales service is also reliable; having them help you analyze things can be faster and more convenient. It facilitates future operation and maintenance.
First, measure the thickness and check the original data; compare the thickness at the crack site. If there is a reduction in thickness and a decrease in strength, it is possible for cracks to appear during normal operation, or due to pressure buildup at the outlet
Could it be alkaline stress corrosion cracking?