1.The cold box foundation is divided into frame type and non frame type. The levelness of top surface of frame type frame shall not exceed 1 / 1000. All sections of the frame shall be placed vertically. All bottom plates of non frame type cold box shall be kept at the same level, and the levelness shall not exceed 1 / 1000.
2.When installing the cold box plate, the adjacent two sides can beassembled into a whole piece or angle type on the ground. The length error of each diagonal line and the perpendicularity error of four sides shall be in accordance with table 2.
Table 2 mm
|
Size |
Tolerance zone |
|
|
Larger than |
to |
|
|
1000 |
2000 |
±3 |
|
2000 |
4000 |
±4 |
|
4000 |
8000 |
±5 |
|
8000 |
12000 |
±6 |
|
12000 |
16000 |
±7 |
|
16000 |
20000 |
±8 |
|
20000 |
|
±9 |
3.The upper end face level of box plate can be adjusted by thin steel plate gasket between foundation frame and framework steel. The width of the steel plate to be padded shall be the same as that of the corresponding section steel.
4.The installation nuts and bolts between the frames should be spot welded firmly. The inner side of the section steel between the frames is intermittent welding with a spacing of 150 mm and a weld length of 50 mm. Its outer side is continuous seal welding (see Figure2). The continuous welding outside the whole cold box must meet the requirements of the air tightness of the cold box.
5.The vertical deviation of the cold box installation is less than or equal to 1.5/1000, but the vertical deviation of the total height of the cold box shall not be greater than 20 mm, or according to the drawing requirements.
