The quality control of the installation and construction of the storage tank is divided into three stages: the prefabricated parts of the storage tank, the pre-assembled parts of the storage tank, and the formal installation of the storage tank. The quality control should run through the entire construction process. Among them, professional control measures in the entire installation project are also necessary and one of the most important links. Next, let’s talk about specific control measures.
Professional control skills and measures
(1) After the prefabricated parts such as the bottom plate, the vault plate, the pressure bearing ring, and the wall lining plate are finished, the logo should be transplanted.
(2) For the pre-assembly construction of the vault and the pressure ring outside the tank, environmental factors should also be considered, and special measures for winter and rainy seasons should be prepared.
(3) Anti-deformation measures should be taken when the bottom plate edge plate, hot corner protection wall plate, inner tank wall plate, etc. are assembled.
⑷ Reasonable tooling planning shall be adopted during the construction of the inner tank siding to ensure the dimensional error and safety requirements.
⑸The installation process of the bottom plate and the wall plate shall be carefully checked in strict accordance with the inspection and experimental plan (ITP document) of the LNG storage tank.
⑹9%Ni steel should be stored properly to avoid magnetization and not hammer. When the temporary tooling is removed, it should be cut so as not to damage the base material.
⑺ The appearance of the weld should be inspected after welding, and the slag and splash should be cleaned before inspection; the surface of the weld and the heat-affected zone should not have defects such as cracks, pores, slag inclusions and arc craters, and should be inspected in the direction of the weld. Mark, record and report for inspection.
⑻ The inner and outer surfaces of the vertical seam and the circumferential seam of the inner tank wall plate should be ground flat.
⑼ 100RT inspection shall be carried out for the butt joints of the inner tank edge plates, the welding seams of the wall plates, and the butt joints of the reinforcement ring.
⑽All welding scars on the steel plate must be ground flat, and PT inspection should be carried out, and the marking and recording should be carried out on the layout diagram.
⑾The furnace batch number of all steel plates should be specifically recorded on the layout drawing.
⑿In the water filling experiment, it is necessary to confirm that there is no leakage in the welding seam of the inner wall plate, and that the annular concrete ring beam has no cracks except for the construction joints.
⒀ The content of the observation of the settlement of the storage tank includes the observation of the settlement of the outer wall of the tank, the inclination and settlement of the outer wall of the tank are different, and the settlement height difference between the inner and outer tanks is measured by the temporarily set measuring points.
⒁ The storage tank should be tested for positive and negative pressure.
Wuxi Hansheng Pressure Vessel Industrial Co., Ltd is a manufacturer of cryogenic storage tanks, lng storage tanks, lng gas filling station equipment, cryogenic liquid transport vehicles, natural gas storage tanks, lng tankers, liquid nitrogen storage tanks, carbon dioxide storage tanks, cryogenic liquid nitrogen transport vehicles, and we produce cryogenic liquids With its advanced technology, excellent quality and excellent after-sales service, equipment such as storage tanks, tank cars, tank containers, and low-temperature insulating gas cylinders are widely accepted by many famous gas companies at home and abroad. Welcome to consult.
Post time: Apr-07-2022