Standards for Eddy Current Tubes. You're prepared to ask for a quote on a standard. Here is what we require: What is the substance? (OD, Wall, and alloy) Does NDE provide the material, or will the client provide it? What size and types of flaws are required? (Most depths are provided in percent of tube wall) Is there a requirement that the standard adhere to? the ASME, etc. Please send along any drawings you may have, even if they are just quick sketches done by hand. We have years of expertise cutting a wide variety of flaws and are experts in creating unique eddy current tubes. In addition to TWHs and FBHs, OD and ID grooves, milled flats, and OD and ID thinning bands, there are also ID FBHs, ID contoured flats, 120°/180° wearscars, tapering defects, and other surface imperfections.