In a multi product cross country pipeline pumping petroleum products like Motor Spirit & Diesel etc it is required to trip the running booster pump in case of accidental closure of the motor operated valve on the pump discharge line to prevent no flow condition of the pump. Due to difference in density between Motor Spirit (0.73) and Diesel (0.825), is it required that the trip setting pressure to be reduced during Motor Spirit pumping & increased during Diesel pumping? What is the standard practice w.r.t discharge pressure trip setting in such multi product pumping?