Hello Everyone,
I never understood the operating principle of honeycomb seals and hole pattern seals. How do they achieve better rotordynamics when compared to normal labyrinth seals? How do they work?
Why does Shell DEP prevent the use of such seals unless approved by the end user?
Thanks in...
Hello Everyone,
What do you guys think about adding a different pump model from a different pump OEM next to a set of fixed speed pumps running in parallel considering that the new pump will also operate in parallel with the existing pumps? Of course the new pump will be designed for the same...
Hello Everyone,
I was wondering how to predict the location of the operating point of a variable speed compressor changes based on control set point.
For example, consider a compressor running at its rated point and controlled via discharge pressure control. Assuming the operator decides to...
Hello everyone,
I would like to know why is tubing should not be used for sizes above 1 inch for lube oil and seal gas systems as per API 614?
I have also come across many client specs prohibiting the use of tubing even for sizes less than 1 inch. These specs insist that piping is only...
Dear All,
I have came across many customer specifications that limit the "Inlet Nozzle Velocity" to a specific value. Some specs call for a max value of 28 m/s, 30m/s, 46 m/s, etc. (Please see below article as well) I want to understand;
1. where these values are coming from?
2. why is there...
Dear All,
This discussion is based on a tandem Dry Gas Seal with an intermediate labyrinth for an API 617 centrifugal compressor.
I have read multiple sources online and in dry gas seal handbooks that differential pressure control of seal gas supplied to the dry gas seal results in higher seal...
Dear All,
The subject topic has been discussed extensively on many platforms but I see many contradictions between platforms, books and online literature.
I always like to refer to William Forsthoffer books about rotating equipment and compressors. In his book, he mentions that an increase in...
Hello All,
I have two questions regarding the discharge valves of a multistage centrifugal compressor:
1. In the case in which a dynamic simulation shows that a hot gas bypass valve is required on the compressor discharge, I have usually seen two dissimilar check valves right after the hot gas...
