There are several manufacturers of pipe clamps for larger sizes. Try the Greaves G1 Series (800-243-1130, sorry, I don't have a web address for them).

I have used ILSCO in the past, prices were very reasonable. http://ebusiness.ilsco.com/webapp/w...gId=-1&catalogId=1&categoryId=77

Tom


Few things are harder to put up with than the annoyance of a good example.