Cast Iron Specifications
Cast Iron Specifications
(OP)
I am putting together a specification for a project and am not quite clear on specifications used in the 1960s. I am tying 3" DI pipe into existing Cast Iron piping using modern DI fittings. I have the old specification that these pipes were built to and it calls out cast iron piping, specifically "USAS 21.6 or 21.8, Class 22 mechanical joint to USAS 21.11 cement mortar lined to USAS 21.4, bituminous coating".
My question boils down to the class 22 nomenclature, I suspect that USAS evolved into ANSI/AWWA since the numbers line up. I do not have a copy of any of these specifications handy, but is "Class 22" called out in one of them? I've got information on thickness class 5x and pressure class XXX pipe, but nothing about class 22. I ask because I want to tie in the new DI stuff using all pressure class 350 stuff, and I want to say that pressure class 350 meets or exceeds class 22 Cast Iron.
Thanks
My question boils down to the class 22 nomenclature, I suspect that USAS evolved into ANSI/AWWA since the numbers line up. I do not have a copy of any of these specifications handy, but is "Class 22" called out in one of them? I've got information on thickness class 5x and pressure class XXX pipe, but nothing about class 22. I ask because I want to tie in the new DI stuff using all pressure class 350 stuff, and I want to say that pressure class 350 meets or exceeds class 22 Cast Iron.
Thanks





RE: Cast Iron Specifications
RE: Cast Iron Specifications
RE: Cast Iron Specifications
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Cast Iron Specifications
And I am actually tying a 3" pipe DI into the 6" CI. I know that's an oddball size, but we've already picked that size pipe for the well. The 3x6 reducer isn't the most common, but they can be bought.
RE: Cast Iron Specifications
http://www.american-usa.com/resources/technical-ma...
RE: Cast Iron Specifications
Steve
RE: Cast Iron Specifications
It is my understanding that thickness classes are usually specified in sewer applications whereas pressure classes in water distribution applications, is that correct?
RE: Cast Iron Specifications
In summary, since 1992 both water distribution and wastewater ductile iron piping has been furnished with the new Pressure Class designations. As with any new developments, some utilities stuck with old thickness class designations for some time (that are available still to the present day), but the industry overall has furnished more and more modern Pressure Class over the last now near quarter century.