C900 PC 150 vs PC 200
C900 PC 150 vs PC 200
(OP)
Hello All,
A few years back, a local civil engineer convinced the municipality here to require PC 200 for water lines instead of PC 150. The rationale was that as temperature of the pipe increased, hoop strength decreased, and in the case of PC 150, might decrease to the point of failure at the joints.
With that as background, I'm taking a poll. What do the jurisdictions you work with specify, and what is the basis for what they require?
A few years back, a local civil engineer convinced the municipality here to require PC 200 for water lines instead of PC 150. The rationale was that as temperature of the pipe increased, hoop strength decreased, and in the case of PC 150, might decrease to the point of failure at the joints.
With that as background, I'm taking a poll. What do the jurisdictions you work with specify, and what is the basis for what they require?





RE: C900 PC 150 vs PC 200
RE: C900 PC 150 vs PC 200
As rconner obliquely references, you should be using DR14, 18, and 25 instead of PC200, 150, and 100.
Regardless of the AWWA changes, I still use the 100, 150, and 200 psi in PVC pipe design for potable water and wastewater pressure piping.
I have designed potable water lines in the 4" to 20" range under several municipalities in flatland Florida and Georgia. Generally, they require DR25 for transmission. On site water lines, I typically use DR18 to accommodate fire pumping used at FDCs.
The federal Unified Facilities Criteria (old Technical Manuals) require 150 psi minimum for water mains.
Only one municipality required DR14 on sites for fire pumping issues, but I believe they were confused as to what design pressures were required on site. They were the stupidest municipality I worked with.
RE: C900 PC 150 vs PC 200
RE: C900 PC 150 vs PC 200
I have designed in Florida and southern Georgia and reviewed many other local design standards in California, Arkansas, Arizona, Mississippi, South Carolina, Texas, and North Carolina.
I don't recall a utility company during these reviews banning PVC under 24", although I've only looked at one or two local utility standards in each state mentioned.
RE: C900 PC 150 vs PC 200
I have done one project in SoCal using PVC
RE: C900 PC 150 vs PC 200
Do you think there are soil and/or climate issues with PVC in the southwest, or just regional/historical preference? Maybe both?
RE: C900 PC 150 vs PC 200
With over 20 years of C900 use in one of the systems, there were no major problems using C900. The other system hasn't been around long enough to know if there are issues, but other systems in the same area have been specing C900 for years with no major problems.
RE: C900 PC 150 vs PC 200