Large low-temperature storage tank inspection and maintenance method

Abstract

The invention provides a large low-temperature storage tank maintenance method which is reasonable in design, short in maintenance period and low in maintenance cost. The method comprises the following steps: (1) detecting a bottom plate of an inner tank; (2) detecting an inner tank wall plate; (3) detecting an outer tank bottom ring plate; (4) detecting the wall plate of the outer tank; (5) transforming a drain hole; (6) interlayer pearlife is removed; (7) tank wall elastic felt replacement; (8) ceiling glass wool replacement; (9) replacing a multi-point thermal resistor; (10) a servo liquid level meter is additionally arranged and used for measuring the liquid level of liquid; and (11) adding an average thermometer for measuring the temperature of the liquid.

Description

technical field [0001] The invention relates to a large-scale low-temperature storage tank inspection and maintenance method, in particular to the inspection and maintenance of large-scale atmospheric-pressure low-temperature storage tanks storing low-temperature media, such as LNG, liquid ethylene, liquid propylene, liquid ammonia and other low-temperature storage tanks. Background technique [0002] More and more low-temperature storage tanks are used in the energy and petrochemical industries. These low-temperature storage tanks mostly adopt a double-layer structure, and glass bricks, expanded perlite and glass wool are used as thermal insulation materials between the inner tank and the outer tank. The design life of the storage tank is generally 20 years. When the storage tank reaches the design life or when the owner thinks it is necessary to overhaul the storage tank during operation, it is necessary to open the tank for inspection of the low-temperature storage tank. H...

AI Technical Summary

Problems solved by technology

The design life of the storage tank is generally 20 years. When the storage tank reaches the design life or when the owner thinks it is necessary to overhaul the storage tank during operation, it is necessary to open the tank for inspection of the low-temperature storage tank. However, the inspection period of the tank opening inspection is long and the maintenance cost is high. question

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