1 Brief introduction of thin oil sealed gas holder
The world's first thin oil sealed gas holder appeared in Germany in 19 15. It consists of a regular polygon box, a piston system, a cabinet bottom plate, a sealing system and a cabinet top system. The gas is stored in the cabinet below the piston, and the gas is stored and output by the up-and-down movement of the piston, so as to adjust the pressure in the gas pipe network. The thin oil sealed gas holder has great advantages in function: (1) Because the tank body is a regular polygon structure, the spacing between ribs is small, the tank body has relatively uniform rigidity, strong deformation resistance and strong side plates; (2) Because the cross section of the side plate is C-shaped, it has high rigidity and will not deform during transportation and installation, and the installation of adjacent side plates is also very simple and reliable, which has great advantages in installation and manufacture; (3) The pressure generated by sealing the side plate of the sliding plate is small, and the sealing device has simple process and low price level.
Installation technology of 2 thin oil sealed gas holder
2. 1 Installation of cabinet floor
The bottom of the thin oil sealed gas holder is made of steel plates, which are overlapped and connected. Before laying the cabinet floor, paint should be painted on the lower surface of the cabinet floor. Before the cabinet bottom plate is laid safely, pay-off should be carried out on the basis of the gas holder, and then laying should be carried out according to the layout, and the laying order is from the middle to the periphery [1]. After the laying of the cabinet bottom plate is completed, the overall inspection and acceptance shall be carried out for its overall dimensions, overlapping amount and reserved process welds, and the subsequent welding work can only be carried out after the acceptance is qualified. The welding work adopts zone jump welding, and the stress should be released during welding.
2.2 column installation
The installation of the column should be carried out on the column assembly platform at the top of the cabinet, and the working height should be grasped. During the installation of columns, attention should be paid to controlling the verticality of columns, especially the installation of the first column, which requires high installation technology. The installation method can be adopted. Before installation, the technical indexes of the column should be checked, including the deviation of the width of the column guide wheel, the deviation of the column length, the vertical and horizontal deviation of the pin hole distance, the deviation of the thickness of the guide wheel plate, the deviation of the curvature of the front and side of the column and the distortion of the guide wheel plate surface. Only after these technical indicators pass the inspection can the column be installed. When adjusting columns, the deviation of column spacing should be evenly distributed in the corresponding areas. After the column is aligned, the upper and lower sides are fixed with side plates respectively, and the anchor bolts are fastened. The number of joints of columns is small, but the quality requirements are high. The joint of the column should be positioned with a special mold, and it is necessary to check whether the top surface of the column is flat, whether the guide wheel plate is fastened with the working surface of the mold, and then lock the steel web of the column with bolts. When welding columns, attention should be paid to the selection and drying of covered electrode, and each joint should be welded in strict accordance with the construction drawings and technical requirements. Preheating before welding, heat preservation after welding and welding quality must meet the technical requirements.
2.3 Side plate installation
The installation of side plates should adhere to the principle of two groups of symmetry, and ensure that the assembly direction of each group of side plates is opposite to that of the next layer of side plates. The side plates shall be assembled on the upper platform of the external scaffold, and the side plates and columns shall be fixed in the installation position with fixing pins, so as to ensure that the staggered edges of the upper and lower side plates are ≤ 0.5mm, and the lap gap between the side plates and columns is ≤ 0.3mm. In order to reduce the deformation of the side plates caused by welding, it is necessary to ensure that there are two layers of assembled side plates above the side plates, and the circumferential direction of the side plates to be welded is opposite to that of the next layer of side plates. In addition, after the welding of the fixing pin, the side plate and the column is completed, the guide rail surface should be smoothed with an angle grinder to prevent air leakage or scratch the sealing sliding felt.
2.4 Installation of piston system and cabinet top system
In the installation process of piston and tank top system, in order to ensure the relative stability of piston and tank top system in the floating process, the geometric dimension deviation of the system should be controlled within 3 mm Piston sealing device is the key component of gas holder, and it is sealed by setting flexible material between piston oil groove and side plate. Assemble the slide plate according to the installation spacing of the columns, and weld the slide plate with the corner slider. Put the sealing canvas into the oil tank, press the pressure plate and tighten the bolts. Finally, install the spring and sleeve simultaneously. After installing the spring and sleeve, install the bulkhead canvas and traction device.
2.5 gas holder debugging
After all installation work is completed, clean the gas tank and check the sealing mechanism, oil supply system, air pressure and piston operation in the tank until all parts and processes meet the standards. By adjusting the sealing mechanism, the starting times of the oil pump can meet the design requirements. When adjusting the oil level adjusting device, it is necessary to ensure that the oil level in the piston oil tank remains unchanged. The pressure fluctuation mainly comes from the elastic change of the contact surface between the piston guide wheel and the column. The counterweight of the piston structure is fixed, so the pressure is also fixed. When debugging the operation of the piston, attention should be paid to the adjustment of the piston inclination to avoid the leakage of sealing oil due to excessive inclination.
Three key points of quality management in installation of thin oil sealed gas holder
3. 1 sheet welding quality management
In the installation process of thin oil sealed gas holder, thin plate welding technology will be adopted for the bottom plate, bottom oil tank, side plate and piston bottom plate. When welding, it is necessary to ensure the technical level and professional qualification of welding personnel, so that the welding work can be carried out with high quality, and at the same time, it is necessary to ensure that the welding energy is strictly controlled, and the welding process should conform to the provisions of relevant specifications. After welding operation, scientific inspection method should be adopted to inspect the weld quality, and the horizontal weld between tank bottom and tank bottom can be inspected by 100% vacuum inspection method; Kerosene penetration method can be used to check the vertical joints of tank bottom oil tank, piston bottom plate, side plate and piston oil tank.
3.2 Quality Management after Installation
Before installing the column, the technical indicators of the column must be strictly checked, and the installation can only be carried out after the indicators are qualified. At the same time, we should also pay attention to the removal of the column joint template, and check the longitudinal and transverse deviation of the joint with a 2m guide rule to ensure that the maximum gap is ≤1mm.. In addition, in the aspect of column verticality control, short-range control and remote control are combined, and theodolite and line drop are used for accurate measurement to make column verticality meet technical specifications and requirements. After the column assembly test is qualified, the column joint shall be welded under strict process guidance, and shall be leveled after welding to ensure that the welding deformation is ≤1mm..
3.3 Quality Management of Floating Installation
When floating, pay attention to the contact between the piston guide wheel and the guide rail surface of the column when the piston moves upward, so as to avoid the floating obstruction caused by poor contact and affect the operation of the whole cabinet. When the floating piston rises, the inclination of the piston should be measured and adjusted in time. When the inclination of the piston is too large, one side of the sealing structure will press to the other side to stretch, and the gap between the sliding plate and the side plate at the stretching end will increase, which will increase the leakage of sealing oil and even make the gas leak, so that the piston will fall to the bottom. Therefore, it is necessary to ensure that the inclination of the piston is ≤D/500 in sunny days and ≤ D/ 100 in cloudy days.
4 conclusion
To sum up, when installing the thin oil sealed gas holder, it is necessary to meet the technical requirements of bottom plate installation, column installation, side plate installation, piston system and tank top system installation and trial operation of the cabinet, so as to ensure the installation quality of the thin oil sealed gas holder.
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