Manholes for drain and sewer systems supplied with standard C250 (25 tonnes) covers and optional heavy-duty D400 (40 tonnes) versions, referenced to EN 476 and EN 752-1 definitions and applications.
Overview
All covers have a standard load rating of C250 (25 tonnes), and heavy duty D400 (40 tonnes) versions are available.
Use in Drain & Sewer Systems (As Provided)
Drain and sewer systems may include structures for overcoming height differences, inspection chambers, intersection structures, storm water overflow works, infall works (street type drainage), outfall, and valve works, besides manholes.
Standards Reference (As Provided)
- EN 476: Manholes form the largest share of sewer and drain system structures; inspection chambers to EN 476 are also increasingly used.
- EN 752-1: A manhole is defined as a chamber with a removable cover on a drain or sewer to permit personnel entry.