What key aspects should be considered in the construction of large storage tanks?

Foundation section: trench inspection, steel bar lapping, formwork support, wall flatness, and slope and flatness of the asphalt sand surface. Main body, bottom of tank layout, control of welding deformation in mid-span plates and vertical plates, welding quality, reinforcement of accessories, cambering of tank top.

The key steps are generally as follows for reference: 1. Pile testing and pile driving; 2. Layout of the tank bottom plate; 3. Installation of the tank top in place; 4. Welding procedure qualification and welding quality; 5. Anti-corrosion treatment inside the tank; 6. Hydrostatic testing, etc. For the construction of tanks made from different materials or of different types, the key points vary. For example, in the case of low-temperature tanks, special attention must be paid to the welding of the inner tank and to the insulation measures.

Refer to the oil tank design manual as well as the oil tank acceptance specifications; they contain detailed information.

The arrangement of the bottom and top plates of a tank is very important; a proper arrangement can help save a significant amount of material. The sequence in which the various plates forming the bottom and top are welded together is also crucial, as it directly affects the degree of deformation after welding. Generally, the walls of tanks are quite thick, and the bevel angle plays an important role as well. The foundation of large storage tanks is of utmost importance; tilting of oil tanks usually occurs due to an inappropriate choice of foundation that does not suit the local geological conditions. There is another detail to consider: the water shield on oil tanks should not be horizontal; it should extend below the top of the insulation layer. Otherwise, rainwater can flow along the horizontal water shield into the insulation layer, leading to premature failure of the insulation.

Level measurement, corrosion protection, static grounding, etc

I guess the main question the poster has is regarding installation. I do have some experience that I’d like to share: 1. During the preparation phase for construction: a) The poster should first familiarize themselves with the blueprints, paying attention to two things: first, what standards are being used for design and construction; second, what materials are used for steel plates, pipes, flanges, etc. b. If the property owner is the one in charge, they should ask the construction company to prepare a construction plan. This plan should include layout diagrams for the floor slabs, roof panels, and wall panels, a diagram showing the sequence of welds for the floor slabs, as well as detailed instructions for the hydrostatic testing. Additionally, PQR and WPS documents need to be prepared. c. The construction company should bring the original welder’s certificates of all welders involved, and welding tests should be conducted on-site. After these tests, the property owner can hire a non-destructive testing company to conduct further inspections; welders who pass the tests can be used, while those who fail cannot. d. After the materials are purchased, conduct an inspection first, checking against the welder’s certificate and the furnace batch number. If a carbon steel plate is to be coated with an undercoat, it must first be sandblasted to remove rust; generally, the surface should reach SA2.5 standard before painting is applied. Leave a space of 100 mm on each side of the weld. 2. During the construction phase: If the preparatory work mentioned above is done properly, during construction it is necessary to pay attention to the amount of misalignment at the joints of the steel plates, to ensure that there is sufficient overlap between the bottom plates. It’s also important to check how well the surfaces are prepared before welding, whether the welds are full and dense, and to look for any signs of undercutting. In addition, welds should be inspected randomly for defects, and it’s necessary to verify that the position and height of the pipe openings are correct. Safety must also be taken into consideration. 3. Construction acceptance phase: a. Vacuum pumping of the base slab; b. Hydrostatic testing, observation of foundation settlement, strength testing, and stability testing. When releasing water, make sure to open the top nozzle to avoid accidents that could cause the tank to deflate. If you follow the steps I outlined, then there will definitely be no problem with the quality of your jar.

I think there are two key points: the first is the arrangement of plates at the bottom and top of the tank, which allows for reorganization based on the weight of the incoming materials. The second is to control welding deformation.

Everyone upstairs has said great things; I support it. Furthermore, in addition to ensuring that design and construction are carried out strictly in accordance with standards, I think it is also important to take into account the geological conditions of the area where the storage tank is located, such as areas with saline soil.