Seal Selection
 

(I)   SECONDARY SEALING ELEMENT SELECTION
 
  For Teflon Bellow The Seal has got best Secondary Sealing Arrangement, Wherever Teflon Bellow Seal is Suitable
  For Rubber Bellow M.O.C. of elastomer to be selected based on temp. & fluid to be handled
  For ‘O’ Ring seal   M.O.C. of ‘O’ Ring  to be selected based on temp. & fluid to be handled
  For Wedge              PTFE, GFT, Grafoil based on temp.


ELASTOMER TEMP. LIMITS

    ‘O’ RING
 
Temp.(Deg. C) Material
     
  -16  to  194 Viton
  -47  to  149 EPR
  -45  to  97 Buna-N / Nitrile
  -33  to  139 Neo prene
 
    WEDGE
 
  Temp.(Deg.C) Material
     
  -30   to 120 PTFE
  120  to 230

GFT

  230  to 400 Grafoil
 


(II)   FACE COMBINATION SELECTION BASED ON  PV FACTOR & LIQUID
 

(1)   In case of Teflon bellow seal only two out of following to be selected.

         GFT Vs. Ceramic (For highly corrosive but nonabrasive  liquid)

         SIC   Vs. Ceramic (For highly corrosive & abrasive liquid)

(2)   For any other seal check PV factor & fluid to be handled.

  Material PV Factor (Bar.  m /s)
     
  SIC  Vs. Carbon 1800
  TC   Vs. Carbon 400
  Stellite Vs. Carbon 300
  TC   Vs.  SIC 250
  SIC  Vs.  SIC 200
  TC   Vs.  TC 100

Sumika Seals Pvt. Ltd. - Copyrights 2009.

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