The introduction of existing, improved or radically new process technology in the process industries is not finished until the technology is implemented and operating well within the company’s organization and premises; a fact of growing importance in the perspective of digital transformation. In a literature review of technology transfer models, studies of intra-firm process technology transfer were found to be scarce, and this article, aims to close this gap. Relying on the author’s industrial experiences and a literature review, 25 success factors for intra-firm process technology transfer were developed and operationalized for company use. To serve as an illustrative case in order to facilitate company implementation of the results, the success factors were afterwards included in a questionnaire in an exploratory survey to professionals in the petrochemical industry. The findings indicate that companies would benefit from the development and use of an internal guide for inter-firm process technology transfer. The holistic hierarchic structure of the success factors could not only be used as components in such a manual but also serve as a “checklist” for companies’ internal improvement programs for process technology transfer.