Under ISO 9712, which covers thermography for NDT work, this topic is clearly covered in section 10.4 and 10.5, from which I quote in part below, and Annex F which is specifically for Level III.
"10.4 Renewal
10.4.1 Prior to the completion of the first period of validity, certification may be renewed by the certification body for a new period of similar duration, provided the certificate holder supplies documentary evidence of a) satisfactorily fulfilling, during the preceding 12 months, the vision requirements of 7.2.1 a), and b) continued satisfactory work activity, relevant to the certification, without significant interruption.
10.4.2 If the criterion 10.4.1 b) for renewal is not met, the individual shall follow the same rules as for recertification (see 10.5).
10.5 Recertification
10.5.1 General
Prior to completion of each second period of validity, or at least every ten years, the certified individual may be
recertified by the certification body for a similar period, provided the individual meets the criterion 10.4.1 a) for
renewal and meets the following conditions, as applicable."
ASNT addresses the issue of re-certification in SNT-TC-1A as follows:
"All Level I and II NDT personnel shall be re-certified every three (3) years based upon evidencof continuing satisfactory performance as judged and documented by the certified NDT Level III for the applicable method. Where a weakness is identified by the NDT Level III in the technical performance of an individual supplemental training and specific examinations may be used, at the discretion of the NDT Level III, to upgrade the individual prior to completion of recertification. Level III personnel shall be re-certified every five (5) years based upon continuing satisfactory performance as judged by ASNT."
The system mentioned earlier in this thread may be a derive from other standards, but one must be clear that it is a certification scheme created by a private company (FLIR) and may or may not comply with accepted international standards and/or the needs of the company and their customers. Too often I've found people in our industry not being clear about that which I think is a mistake.
Thermally Yours,
John
ASNT NDT Level III #48166
The Snell Group
www.thesnellgroup.com
www.thermalsolutions.org
800-636-9820