Introducing existing, improved or radically new process technology in the process industries is not finished until it is operating well at the firm’s premises; a fact of growing importance in the perspective of digital transformation. However, since it is uncommon for firms in the process industries to develop own process technology, they are dependent on suppliers for the acquisition of new equipment. Relying on the development of an organisational framework, the authors’ industrial experiences, and a literature review, success factors for inter-firm process technology transfer were initially developed. To facilitate the company use, and as an illustrative case, the success factors were afterwards included in a survey to informants in the petrochemical industries. The findings indicate that companies would benefit from the development of an internal guide for inter-firm process technology transfer. The success factors could not only be used as components in such a manual, but also serve as a “check-list” for internal improvement programs for process technology transfer.