Hennepin County

Welcome, Guest!
Log in | Employee Login | License
 

Messages

PROJECT QUESTION: What DR rating is required for the C900 & C905 PVC for the storm sewer?

Q: What DR rating is required for the C900 & C905 PVC for the storm sewer?
DR25 = 165 psi
DR21 = 200 psi
DR18 = 235 psi


A: S-81.1 (part of 2503 Pipe Sewers) mentions:
'The AWWA C900 and AWWA C905 PVC pipe sewer shall meet the pressure pipe requirements of CEAM 2611.2.A.3.'

Page 22 of the CEAM (attached to the Project Proposal), within the 2611.2 Materials chapter, under subpart A2 'Polyvinyl Chloride (PVC) Pressure Pipe and Fittings', the following excerpt:
'PVC pressure pipe and fittings shall have a pressure rating of one hundred sixty (160) psi or greater, unless otherwise provided in the special provisions.'

The DR25 is acceptable as long as it meets or exceeds the CEAM requirement of 160 psi.