Customer is operating a complex where some of its plants produce HP steam. The steam is used in the other complex’ plants and the excess is used to generate electricity with the option to use the steam down to condensation.
The control system was not designed to properly deal with surplus steam and the pressure at the “users” distribution spider exceeded the safety set. Large quantities of steam were blown off to protect the system which was also accompanied by noise nuisance.
Taking into considerations the actual pressure at the “Users”, Controlling the condensing stage of the turbines – reduced the actual blowing off to cases where “real” problems accrue.