Anti Rotation Pin comes out of In Board Stationary Face.
Anti Rotation Pin comes out of In Board Stationary Face.
(OP)
Dear All,
I am facing problem with Agitator seal. Everytime seal fails the anti rotation pin shears off from In board stationary face.
Portion of In board stationary face also comes out from face. I/B face combination is SIC VS SIC. This has repeated 4 to 5 times.
This is double cartridge seal.
Process details:
Product : ISO BUTYL BENZENE
RPM : 300
Temp : 180Deg.celcius
Operating Press.: 41 Kg/cm2.
What could be the reason of Anti Rotation pin coming out from Inboard stationary face?
Pls. find attached seal drawing.
I am facing problem with Agitator seal. Everytime seal fails the anti rotation pin shears off from In board stationary face.
Portion of In board stationary face also comes out from face. I/B face combination is SIC VS SIC. This has repeated 4 to 5 times.
This is double cartridge seal.
Process details:
Product : ISO BUTYL BENZENE
RPM : 300
Temp : 180Deg.celcius
Operating Press.: 41 Kg/cm2.
What could be the reason of Anti Rotation pin coming out from Inboard stationary face?
Pls. find attached seal drawing.





RE: Anti Rotation Pin comes out of In Board Stationary Face.
trust that this helps
RE: Anti Rotation Pin comes out of In Board Stationary Face.
1) Yes Operating pressure in reactor is 41 Kg/cm2 & that of barrier fluid is 44 Kg/cm2.
2) Operators operate this reactor by filling reactor with 100% product i.e. reactor is completely filled with product instead they should fill reactor with 70% product & then pressurize it with nitrogen to 41 Kg/cm2. I have conveyed the same.
3) This plant has 3 reactor & they keep changing over reactor from one to another. When reactor is in standstill condition the product that comes in contact with I/B faces gets crystallized and damages carbon face which is the reason why I/B faces were changed from CAR VS SIC to SIC VS SIC.
4) Seal fails suddenly during rotation.
5) Previously we have provided carbon vs Sic face still pin was coming out from stationary SIC face.
6) Other 2nos. of reactor having same seal design doesnot have anti rotation seal coming out from stationary face.
7) How can I know that reverse pressure is acting on seal ? & that too in Reator?
8) Barrier pressure is always maintained at 44 Kg/cm2.
RE: Anti Rotation Pin comes out of In Board Stationary Face.
i think you may need a seal upgrade to engineer out your problems.
RE: Anti Rotation Pin comes out of In Board Stationary Face.
I would work with the seal manufacturer to understand if the housing and stationary face design are accurate. Additionally, the pin should be a pretty tight fit into the back of the face. If you are utilizing Sic v Sic like you mentioned, you may modify the housing to have the pin pressed into the housing instead of the face. This will allow you to put a tighter fit on the pin so that it stays put. Then have your seal manufacturer add a slot on the back of the stationary face to engage the pin.
Hope that helps.