Page 211 - Know and Understand Centrifugal Pumps
P. 211

Know and Understand Centrifugal Pumps

             - Disaster Bushings for API compliance

             Cartridge Seal designs comply with most pump standards like:
             -  ANSI
             -  API
             -  IS0
             -  DIN

         Here is an illustration of a typical cartridge mechanical seal mounted on
         a shaft in the seal chamber of the pump (Figure 13-18).























            1.  Static ‘0’ ring.               9.  Setscren.
            2.   Spring.                       10.  Gland.
            3.   Dynamic ‘0’ ring.             11.  Nuts.
            4.   Rotating face.                12.  Spacer for spring tension.
            5.   Stationary face.              13.  Flush line.
            6.   Static ‘0’ ring.              14.  Cooling and draining.
            7.   Self alioning springs.        15.  Pump body.
            8.   Disaster bushing APi.
        Figure 13-18


        Double seals

         Double seals are also known as dual seals. They are used:
         1. As an environmental control in difficult sealing applications.
         2.  To compensate for certain operational conditions like:
                Operating  a  pump  against  a  shut  valve  or  ‘dead  heading’
                conditions.
                Inadequate NPSHa.


            194
   206   207   208   209   210   211   212   213   214   215   216