FIELD: transportation and storage of liquids, including oil and oil products. SUBSTANCE: proposed invention can be used in designing, building and operating reservoirs for oil and oil products equipped with floating roofs. Gas heat insulating layer is formed between floating roof and level of oil or oil products. Floating roof of reservoir is checked for floatability by changing thickness of gas heat insulating layer. This is done by unit consisting of valve, pressure gauge and siphon. EFFECT: enhanced reliability of checking without additional expenses. 2 cl, 2 dwg, 4 ex
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