The intermediate shell with cylindrical body, dished end bottom shall be fabricated from 6.0 mm thick m.s. conforming to I.S.226. The outer shell with cylindrical body, conical bottom shall be fabricated from 2.0mm thick s.s. conforming to AISI 304. 100 mm. Thick , crown 150 resin bonded fibre glasswool shall be applied in between the outer and intermediate shell. Two nos. of semicircular removable covers of 2.0 mm thick and s.s. girder of 4.0 mm thick to support the covers and geared motor.