scanguy:
I have personally worked with a number of NDT companies in the past in Kingdom for ARAMCO. Please note the following comments are of my opinion only.
Amsyco (Al Mutawa Sam Yong NDT Co.) and Vetco are the first 2 that come to mind. Then there is Contracting and Trading, Cooperheat - Saudi Arabia and Fugro. SGS is also in business as a NDT company in the Kingdom, but I have had nothing but bad encounters with this company. Actually, I have had bad encounters with SGS on 3 continents.
There are a number of smaller NDT outfits who contract their RT to other companies, you may try a web search in your area. I would monitor the NDT activities closely if it is a company you have not dealt with before.
Good Luck.