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rconner, after I read your post I found more information from a different source. here is the explanation: At the turn of the century, ductile iron pipe was created in different types (type 1 to 6) - just like you described initially and then the types 1 to 6 were converted to classes 51 to...

there are a couple of things I still don't understand: 1. regarding the pipes with special classes "-" would I just ignore this and only use the special classes 50, 52, 54, etc.? and 2. what is the reason for having different classes for a pipe rated at a specific pressure rating. For...

Hi, I am doing a conceptual design for a pipeline using three different pipe materials (PVC, HDPE, and ductile iron) - and I am not a materials guy and I apologize for my basic question. My question is in regards to what the definition of Special Class is for ductile iron piping. I have...

I am looking to see if anyone knows the calculation to calculate the pipe strength required when you have to cross beneath a roadway or railway tracks. For example I have a 6" HDPE DR17 (100 psi) pipe that needs to go beneath a set of tracks. The casing pipe has to be 12" but I am not sure of...

your assumption is correct. you won't be able to determine actual colony counts with a BART tester, rather you will get a ballpark figure of how many cfu's there are. To get actual colony counts, the old plate counting method is still the best. Remember that one of the most important...

Hi there, In my last year at university I was taught by the guy who invented the BART test - Dr. D. Roy Cullimore. I was fairly impressed with how it worked and in fact I did my final year project using BART tests. Then when I graduated and got into consulting I used this test at one of my...