Sewer and Manhole

Defects

Probable causes for the defect

Design for Maintainability (DfM) Guidelines
Choking
  • Irregular cleaning – poor accessibility or maintenance practice.
 Design

Construction

Maintenance
Cover stuck
  • Mismatched position of cover.
 Design

Construction

Maintenance
Damaged cover

        Broken manhole cover
  • Poor design
  • Unable to withstand the vehicular load and breaks.
  • Corrosion – poor make.
 Design

Construction

Maintenance

References
[1]  

Normative References/Standards Referred to for Air Handling Unit and Fan Coil Unit