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I’m overseeing the plans and specifications for construction of a 100,000 gallon AWWA D103 water tank with a bolted steel shell and floor that my company is purchasing. The tank is being constructed in an area with frequent significant seismic activity (Los Angeles). The current design calls for...

Take a look at the literature provided by Performance Pipe here: http://www.cpchem.com/enu/performance_pipe_engineering_manual.asp You will need to determine the pipe material. Standard water distribution pipe would probably have been PE3408. I don't think the age of the pipe should be an...

Follow-up: While gathering field data for a current project, I recently encountered a pair of 4" 45-degree caulk-joint elbows installed at-grade without restraint. They are marked "ACIPCo 1937". I spoke with a technician at ACIPCO who informed me that they consider this type of joint to be...

Thanks again for your responses. According to EBAA iron, prior to 1908 both OD and wall thickness of C.I. pipe were often specified by the customer (!). That year however, dimensional standards were created for letter designated pipe classes “A” through “H”. Presumably this was the AWWA C108 /...

Thanks for the responses and the many useful links. The axial load tests were certainly interesting. Cast iron, a pipe material considered weak and brittle compared to ductile iron, took nearly twice as much compressive stress (without leakage) as ductile iron and showed no damage to the pipe...

Are lead caulked joints as encountered in older cast iron water main lines (such as Class 250 or AWWA Class A pipe) considered to be restrained joints? Looking at the geometry of the joint, it looks like it should be self-restraining. It also looks like any movement caused by external force...

BRIS, it looks like my last post needs some clarification. In my original post, I WAS refering to sizes 3" through 6" (75mm - 150mm). C900 is the name of a specification published by the American Water Works Associatation. It has been the standard specification for 4" - 12" PVC water main pipe...

As you can see by the date on the original post, it has been a couple years since I posted these questions. At the time I was attempting to educate myself on the subject of buried pipe systems. For a brief technical overview of stainless steel corrosion in buried applications you might try...

Thanks for the responses. It sounds like stainless steel is probably not going to be a good solution. From a corrosion standpoint PVC would certainly be the best choice. However, at the pressures I am working with (up to 200 psi), PVC fittings do not have adequate strength at sizes 6" and...

I recently posted this question in the piping and fluid mechanics category. I am guessing that some readers of this thread may have some answers or insight, so I am posting it again here. I am in the process of developing standards for my company for 3-6” fittings used in buried pvc...

I am in the process of developing standards for my company for 3-6” fittings used in buried pvc pressurized pipe applications carrying reclaimed water at ambient temperature. I have been looking into the possibility of using stainless steel fittings in new additions to this system, but have...

It is my understanding that pressure derating for tapered thread (npt) pvc pipe/fitting connections is 50%. However, I know that FEMALE pvc threaded fittings are more susceptable to breakage (splitting). My question: would connecting a threaded sch 80 pvc nipple to a brass female fitting also...

Thanks to everybody for the posts. They have been helpful. GTRAINOR: my fax is 323-551-5070. Please mark it attn: J. Arden

I am reviewing engineering standards for my company's irrigation systems. I am looking at design and maximum fluid velocites in our mains and transite lines. They are C-900 or C-905 PVC typically ranging 6"-18". We use reclaimed water. I am concerned that 5 fps may present...