I bought a copy of Piping Engineering (6th Edition) directly from Tube Turns back in 2001. I suggest you call or write them directly in Louisville, Kentucky. I sent them the check for $35 and they sent me the book. Published in 1986, it holds several papers by their Chief Research Engineer - A. R. C. Markl.

But these are reprinted from the Transactions of the ASME, the first one is from Volume 69 Number 8.