Apart from ensuring that a process flange has the right gasket, is clean, aligned, with the right size bolts and nuts, the right material, and right torque value, the bolt torque sequence plays a major part in the integrity of the flange.

LACHI Bolt Torque Sequence is a "best practice" method to achieve uniformity of gasket compression and closure of the flange. It is useful for manufacturers engaged in fabrication of pressure vessels, heat exchangers, and pipelines. Also for oil and gas industries, plants, and facilities engaged in projects and maintenance activities.

The app is for knowledge sharing and expresses the developers opinion of what "best practice" is for bolt torque sequence. Users of this app are still expected to follow relevant guidelines, procedures, and policies for proper flange assembly.