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mathmday, There seem to be some potential "red flags" from what are able to give. Can't go back in time and add another test port. The prepackaged sample bottles used for the absence/presence testing that we use are extreamly sensitve to user contamination and false positives. Filling a...

What the heck, here is a scanned section of C651.http://files.engineering.com/getfile.aspx?folder=a5456d69-73b5-4205-85f6-e23e9bdf3978&file=Document_(53).pdf

bimr, I am refrenceing AWWA C651 2005 revision. The initial dosage 25 ppm and the residual shall not be less than 10 ppm at the end of the 24 contact period. I have written into my past specification for 50 ppm. I found a 1986 C651 and for the continous feed method, it also lists the inital...

mathmday, without being there, it is difficult to find a solution to the problem and I may have more questions than answers? * For each test, what is being tested? Is it only the blow off, or is it both the blow off and the injection tap that was used to inject the chlorine mixture into the...

s0eebuch, I would not use a coupling on an ductile to ductile connection. I would use one when I had no other alternative such as connecting ductile (or C 900) to an over or undersized pipe, or when making a repair from a main break. Instead I specify that a solid sleeve be used if not using...

Skinnydip, You have been given some poorly presented data. If you have a copy of NFPA 291, equasion a) is for flow from a hydrant: Q=29.83*c*d^2*p^0.5 where: Q=flow in gpm c=hydrant coefficient (0.90 for smooth & rounded outlet) d= hydrant nozzle i.d.in inches(usually 2.5)...

Here is Table 1-2 for the 12 inch 21/45. There is a table 1-3, but it is for cast iron gas piping.http://files.engineering.com/getfile.aspx?folder=ead134a7-710c-42aa-988e-c41d055d167e&file=Table_1-2_21-45.pdf

Apparntly I can only load one file at a time. Here is the Table 1-1 for 12 inch 18/40http://files.engineering.com/getfile.aspx?folder=7033dc35-da80-4a62-9ffb-469a28c7646f&file=Table_1-1_18-40.pdf

I have up loaded table 1-1 for 12 inch pipe for 18/40 iron strenth and table 1-2 for 21/45 strenth. all being said, unless you had other info, I would assume the 18/40. I have to admit, I am educating myself on a standard that is old as I am. The more I have read I have realized that the...

It is the age old question that arises when a major road project is planned;keep the main in service or replace it. I happen to have a 1967 edition of A21.1 (AWWA H1) The corrosion allowance is 0.08 in. I assume that is what you were using. Table 1-1, 12 inch pipe at 150 psi, at an 8 foot...

One of the ways is to use AWWA Manual M22 "Sizing Water Service Lines and Meters". It works with total fixture counts to get a probable peak demand. One can adjust for the pressure in the area, unlike using the IAPMO, the plumbing code in my state. Also one can add in the irrigation demand...