How large can water service saddle be?

[canman]

I have a project in Southern California where I have an existing 8" transite water pipe that I plan on tapping into for a new 3" domestic water service lateral. My 3" pipe will be Type K copper. I am looking for the least expensive way to connect the two pipes. The easiest would be a 3" service saddle. Most cities, if not all here, allow only 2" and below. This is on a private site so city has no jurisdiction but I'm sure there is a reason for keeping it below 2". Smith-Blair makes a 3" service saddle, but is this the best way to go? I could also consturct an 8" x 3" tapping sleeve (stainless steel or ductile iron) but how do I connect my 3" copper pipe so electrolysis does not occur? Help!!

 

[yogibear1]

You are probably already aware that transite is a delicate type of pipe to tap. If you have not already ascertained the OD of the pipe thru actual measurement you should, as often it is not the same as DIP or PVC. Then you should obtain a lightwieght service saddle, DIP saddle is very heavy. Only people experienced in tapping transite should do this kind of work. We use HDPE tubing for the services to avoid the corrosion issue. Perhaps the saddle vendor can make or provide an isolator??? Or you might use HDPE for a short run then switch to copper.