From a dated point of view, I recall a few names of experts such as OCTG Proctor Consultancy (Kevin Fearnley, Max Proctor), Geoff Thompson, Gareth Williams, Dave Seymour, Stephen Diamond, Tudor Jones.
See also ISO, API, E&P Forum, CRINE-New Era, European OCTG Procurement Initiative for members residing in Scotland
However more important than selecting the expert is to agree on the 15 Technical Suggestions for ordering tubular goods
1 Outside Diameter tolerances - 0.5% /OD/ +.75&
2 Out of Roundness OOR below .04%
3 Range lengths e. g. Range 3 mean length = 45 ft
4 Toughness requirements minimum 15 ft-lbs
5 Pup joints, a must
6 Alternate drift, also a must & with a longer drift!
7 Matched Strength Connections imperative
8 Qualification of Premium Connections: OD, t, grade, material & coating all spelled out
9 Chemical Composition: complete (aim x actual)
10 Heat treatment spelled out (N or N&T or Q&T)
11 Line pipe used as casing (only if geometrical acceptance by casing Spec 5CT
12 Thread protectors (“driftable” & qualified)
13 Thread Compounds (qualified & environmental acceptable)
14 Pipe Roundness to achieve quality thread cutting
15 Thread Make-up verified with ultrasonic techniques
Hi Ian - hope you are well
Joe Duxbury could be your man if he's not fully retired now although I don't think he is.
He's on Linked-in as tubular consultant. I can get his number for you if required.