How to Measure Mechanical Seals
The next step is to measure the outside diameter of the “stationary” or “seat”.
Then, measure the thickness of the “stationary” or “seat”.
1. What is the rotating seal face made from? Is it a black rigid material? Then it is most likely carbon.
2. What are the rubber or elastomer portions of the seal made from? Unless you are pumping chemicals or high temperature liquids, then it is most like Nitrile (also called NBR or Buna-N).
3. What is the “stationary” or “seat” made from? Is it a white, hard material? Or, is it a metal?
4. What shape is the “stationary” or “seat”? Does it have an o-ring around the outside which is in a groove (like the photo above)? Or, does the “stationary” or “seat” have a rubber piece that it fits into which is like a cup? So, the “stationary” or “seat” is either an o-ring mount or a cup mount type.
Once you have given us the information above, you will be assured of receiving a seal assembly that will fit and function correctly in your pump. Another option is to send us the entire seal assembly and we will size it and identify the materials, even if the parts are broken or worn. For further information click here to contact us.