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[Tie-in points occur in many other industries, as well as oil & gas.] A tie-in point is a location on an existing plant where a new installation is to connect to. Until such time as new installation is built and ready for testing the tie-in points will be unused. It is common to specify the fluid properties avaliable at the tie-in points for the use of the future installation equipment's designers. It is thoughtful and helpful to install a valve-with-blank at tie-in points for prospective future installations when constructing the original installation, or at maintenance shutdowns on the system. Utilities delivery networks (steam, cooling water, compressed air, gas....) are obvious examples of long-life systems whose use can change with the arrival and departure of shorter-life equipment, and not having a suitable valve-with-blank can cause serious timing issues with other users when commissioning becomes due on new equipment. Flow diagrams for the shorter-life equipment will most likely show tie-in points at the package boundary, for project design, and contract definition and administration purposes.

A tie-in is the location & specification for any piping connection made to a vessel, piece of equipment or other pipeline.

Being in the piping industry in paper mills and other places that run year round, 24 hours a day tie-in points can be a pain in the keester. We somtimes must plan ahead as much as 2 years for the right moment of "down-time" to install tie-in points for future projects. Most of the time they consist of a valve arrangement that is installed in the existing piping so that we can continue to run the system till the new equipment is installed and to switch over afterwards. Somtimes when we just have to make the tie-ins on the run we utlize a "hot tap" machine as well as other methods to tie into energized lines.

in cross country pipeline construction 'tie-in' points are left every kilometer or so and at road crossings and the like. A tie in crew comes behind the main line lower and lay to weld the tie-ins and thus make a continuous line. A Tie-in Point is the point where the new piping connects to the existing pipe.