... .The opened cylinder wall and inward bent protrusions of the Metal pall ring allow greater capacity and ... nesting. Compared with the Raschig ring, Pall ring of gas fluxes increase more than 50% mass transfer efficiency ... ;6.High temperature applications,mechanically robust,lesser probability of breakage,so it is very suitable for deeper ... ,316,316L Ihigher gas and liquid loading of pall ring in SS304