Do Burst Effects systems require any preparation before fog can be created?
Yes, since Burst effects depend on spraying liquid nitrogen from the nozzle, all LN2 distribution system components (pipes, hoses, solenoids and nozzles) must be chilled before fog can be created. If this is not done, the effects solenoids will be opened and only cold nitrogen gas will come out. This pre-effect system chill is usually achieved by running LN2 through the entire length of the effects system and evacuating the cold waste nitrogen gas either through the effects solenoids or through a Purge solenoid which is included in the effects system specifically for this purpose. Because of the need to maintain very low temperatures throughout the entire effects system special insulation techniques are frequently used. These include vacuum-jacketed pipes and hoses to minimize heat leaks into the LN2 as it travels to the effects solenoids, phase separators (keep-fulls) to remove nitrogen gas bubbles which may accumulate within the LN2 distribution system, and foam insulated pipe with v
