Standard Components -- Centrally Located Reinforcement
          __ 85mm Minimum Wall thickness
                  -- Reid Swiftlift lifting lugs 1.3 Tonne
Reid 1.3T Lifting handles used to handle components. Under no circumstances should chains or wide hooks be wrapped around components.

To Calculate required component depth from invert and surface level
1.Calculate overall manhole depth from plan surface levels & invert levels
2.Establish height from bottom of first chamber to invert according to pipe diameter and
    construction methods to be employed.
3.Establish cover and surround type and apply to chart page 2 & 3