From my refinery drawing office days many years ago a jumpover was a piping interconnection requested by operations in order to push product somewhere not originally intended.
In context to jacketed piping, a jumpover is used wherever the jacket pipe is terminated e.g. flanges, valves. The jumpover consist of the jacket fluid which is used to heat the core run.
Dear all
Thanks for your inputs. This was an enquiry we received from a petrochemical plant for a procurement and build work. I couldn't see any definition in the contract documents from the owner. Owner wants to change the service of a tank. Contractor has to install new piping from the pump discharge.