Not sure if this will answer your question, but this relates to losses during stable replenishment of the shuttle ET:Stable Replenishment LossAfter the ET is full, the cryogenic loading systems transitions into stable replenishment. The cryogen lossduring stable replenishment is due to the heat transfer through the ET insulating foam, heat transfer into thecryogenic propellant transfer system, and continual SSME conditioning. Approximately 380 liters of LH2 and475 liters of LO2 flow from the ground storage tanks every minute during stable replenishment. The length ofstable replenishment has varied over the SSP, and depends on the amount of work required to be performedsuch as loading astronaut crew and tank inspections as well as the launch window. Ultimately, stablereplenishment occurs until a scrub is declared or until about five minutes before launch. The average totalstable replenishment is approximately 185,000 liters and 190,000 liters for LH2 and LO2, respectively.This is from page 3 of the attached paper.