This product is a horizontal fixed vacuum powder insulation low-temperature storage tank, featuring a double-layer cylindrical structure. The inner container is used for storing low-temperature liquefied natural gas, while the outer shell forms and protects the vacuum insulation space. The gap is filled with pearlescent sand and evacuated to create an effective insulation system. The design of the outer shell and support system can withstand the related external forces generated during manufacturing, transportation, installation, and use. The tank bottom is equipped with a complete set of valves, instruments, and safety devices for operation.
Safety:
One, stainless steel plates are all sourced from Taiyuan Iron and Steel Group, the leading domestic manufacturer of stainless steel plates, ensuring quality. The tubing is procured from Anhui TianDa Steel Tube Co., Ltd., the number one supplier of domestic stainless steel bright pipes.
Material specifications are all in accordance withGB150-2011Re-inspection of "Pressure Vessel," material cutting with CNC plasma cutting machine, strictly controlling the geometric dimensions of the cylinder sections.
Three: Both longitudinal and circumferential seams are welded using submerged arc welding, resulting in good appearance and form, with the inner lining also being processed.100%XRay inspection.
Vacuum Level:
One. The inner and outer surfaces of the stainless steel lining are degreased and pickled for passivation, while the carbon steel shell's inner and outer surfaces are sandblasted for rust removal, ensuring paint adhesion, extending the paint's corrosion resistance lifespan, enhancing the stainless steel plate's corrosion resistance, reducing the air release from the sandwich, thereby guaranteeing the vacuum degree's longevity.
Two, a unique dehydration pretreatment is performed on the pearl sand before loading, and the sandwich layer is heated and purged with nitrogen, greatly reducing the source of gas emissions.
Three, the sand filling uses a vacuum-assisted filling and positive-pressure compaction process, ensuring the uniformity of the sandwiched pearlescent sand. The vibration rod compaction technique maximizes the filling amount of the pearlescent sand, thereby ensuring the insulation effect of the sandwich layer.
Four: Utilizing a unique vacuum extraction process, significantly reduces the vacuuming time for the inner tank and its sandwiched layers, ensuring the vacuum level of the sandwich exceeds national standards. Guarantees the vacuum level of the storage tank to be3～5No reprocessing required within the year.
Appearance:
One, bending pipes are processed on CNC bending machines, ensuring strict geometric dimensions. By not using elbow joints, it significantly reduces pipe resistance and enhances the aesthetics of the outer piping system.
The paint used is from the world-renowned Jotun brand, with two coats of primer and two coats of topcoat, ensuring the paint's longevity and the equipment's exterior quality.
The LNG storage tank is a double-walled structure, consisting of the inner tank, outer tank, internal and external supports, insulation layer, pressure safety system, vacuum pump, pipeline system, etc. All vacuum-insulated structures rely on vacuum. Due to the high degassing rate and suction resistance of the insulation space materials, and the limitation of the baking temperature of the sealing material not being too high and the degassing being slow, suction is difficult. To achieve the required vacuum degree within the design-specified vacuum time for the insulation space, in addition to the vacuum pump and suction process, it also relates to the flow area of the annular suction pipes. To ensure a high vacuum degree and improve the suction rate, a vacuum pump is installed at both ends of the equipment. One vacuum pump consists of three suction pipes, placed in the lower part of the annular space and extending from the bottom, while the other vacuum pump, also with three suction pipes, is placed in the upper part of the annular space and extends from the top. The two groups of suction pipes intersect and overlap along the length of the tank. By increasing the flow area of the suction pipes and using various auxiliary methods such as heating and nitrogen displacement, the vacuum achievement time for the annular insulation space with a volume of 100 m3 is reduced to one-third of the conventional structure.
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