Pressurized Dual Mechanical Seals Supporting Piping Plan Developments

The American Petroleum Institute recognizes four auxiliary piping plans for supporting pressurized dual wet mechanical seals. There is limited published information guidance as to which plan will offer the most suitable solution for any particular application. Recent work within the mechanical seal industry has led to an enhanced understanding of operational issues. This paper is intended to fill in some of the gaps in knowledge and provide an overview of options available. A detailed description of the four plans is provided alongside a summary of the advantages and disadvantages of each. Issues associated with gas absorption and ambient temperature changes are explored alongside practical solutions. There is scope for innovation within supporting piping plans. New technologies are explained alongside test data and a case study. Improved understanding will lead to improved specification that will reduce total cost of ownership. Greater knowledge will assist the operator in obtaining improved seal reliability.