- Before filling with pearlescent sand. Seal all the holes. The flanges inside the cold box are tied with glass fibre tapes and all temperature measuring lines and temperature-sensitive components in the cold box have good performance.
- It is strictly forbidden to build permanent scaffolding in the cold box, and it is strictly forbidden to use flammable and explosive materials to make permanent supports in the cold box. And should be completely removed from the cold box all temporary facilities and flammable and explosive materials.
- with adiabatic sleeve cold valve, after the end of the cold test, shall be filled with slag wool.
- cold butterfly valve without adiabatic casing, in the compensator filled with slag wool, near the cold box wall about 30m a section, with slag wool felt wrapped on several layers, outside with fasteners fastened on.
- measuring pipeline leading out of the cold box at the inner wall, the application of 2mm thin steel plate made of protective cover, in the protective cover filled with slag wool.
- The following parts and each compartment box. All must be filled with slag wool
(1) switch-type process, where the hot end of the plate heat exchanger exposed, the bottom plate shall be uniformly filled with 200 a 300mm slag cotton. In order to avoid vibration caused by switching, do not make the pearl sand leakage outside.
(2) liquid air, liquid oxygen adsorber silica gel filling and discharge compartment.
(3) Automatic valve box manhole cover compartment.
(4) Turbine expander filter maintenance compartment and its snail shell nearby.
(5) Circulating liquid oxygen pump maintenance compartment and filter compartment, etc.
(7) The water on the foundation of small air separation unit shall be removed and dried with hot air before filling with pearl sand.
(8) The pearl sand should be filled to the top of the small air separation unit cold box and no space should be left. In order to prevent the whole bag of pearlescent sand from falling into the cold box and damaging the small pipes inside the box, at the same time, for the sake of safety. A thick grid should be added at the entrance of the top of the cold box or a pearl sand pouring device should be installed.
- When filling the pearl sand, each container (including tower) and pipeline in the cold box are inflated. And keep 50kPa pressure, then slightly open the valve of each meter, each thermometer should be energized to check whether the thermometer cable is damaged during the filling process.
- The filled pearlescent sand is not allowed to be mixed with combustible materials.
- After filling, the entrance should be sealed (with manhole cover)
- Check the pearl sand vibrating situation after 10 days of driving, and make up the filling in time. Make the pearl sand in the cold box is always in full solid state.
