Simulation using the hydrodynamic simulator tNavigator with Network option currently allows solving many tasks in the field of integrated modeling. However, in the current solution of the integrated modeling problem, there are problems that force either to apply alternative calculation methods or to introduce assumptions. One of these problems at the moment is the impossibility of calculating temperatures in the collection network. The purpose of this article is to determine the relevance of the chosen problem, literary and technical reviews of possible solutions, as well as to propose a specific solution for updating and optimizing temperature calculations on the product collection network. The main solution considered in the article is to write a Python script for tNavigator that calculates current temperatures in connection with the integrated model, which eliminates the risks of reducing the project’s profit in existing models. The scientific novelty lies in the use of an effective way to solve this problem, which eliminates the need to use the Network tNavigator — PetEx RESOLVE — PetEx GAP bundle, which greatly slows down model calculations. The conclusion can be a preliminary assessment of the effectiveness and accuracy of the decision regarding the method using RESOLVE and GAP.