What problems should be paid attention to when filling cold-keeping materials?

1) before filling, the water on the base of the cold box should be dried;
2) when filling, every equipment and pipeline in the air separation plant should be inflated, the inflating pressure should be 0.045 0.05MPa, and the valves of each meter should be slightly opened for ventilation. At the same time, power on each platinum resistance, and monitor whether the meter tube and cable are out of order at any time;
3) pay attention that combustibles should not be mixed in the cold-keeping materials and should not be affected by damp;
4) It is not suitable to fill in rainy or snowy days;
5) the filling should be dense, and no zone is allowed. Use wooden hammer or round-headed wooden stick to mash the slag wool when filling, and take samples in manholes to check its density;
6) The constructors who fill cold-keeping materials should take labor protection measures, pay attention to personal safety, and add iron fence at the filling port;
7) pay attention to supplement when cooling materials sink after driving.