text: The predominant form of lining for water applications is cement mortar centrifugally applied during manufacturing.  The cement mortar comprises a mixture of cement and sand to a ratio of between 1:2 and 1:3.5. For potable water, portland cement is used; for sewage it is common to use sulfate resisting or high alumina cement.
  Cement mortar linings have been found to dramatically reduce internal corrosion.  A DIPRA survey has demonstrated that the Hazen-Williams factor of cement lining remains between 130 and 151 with only slight reduction with age.