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The coefficient of contact between the lower drainage type heat insulation fixed joint and the steel is about 0.1, and the resistance during steam pipeline operation is small. The steel frame steel heat insulation fixed section steel sleeve steel buried steel heat insulation steel pipe fixed bracket, roller bearing and the operation of the steel pipe are connected with a special solution to effectively avoid the occurrence of thermal bridges on the surface of the steel pipe. So, how to make the bottom drainage type heat insulation fixed joint?
The elbow, tee, reducer, bellows compensator, valve, etc. of the operating steel pipe are arranged in a steel casing. All the operating pipelines are operated in a fully sealed environment, which is safe and reliable. Insulation layer compound skills The insulation layer can be a single layer of insulation material or a combination of multiple layers of insulation material. The seams of the insulation layer materials should be staggered with each other, the top and bottom layers should be pressed against each other, and all gaps should be densely caulked. The stainless steel fastening steel band is used to bundle the heat insulation materials in sections on the surface of the operation pipe. When the pipe operation is expanded by heat, the insulation layer data and the operation pipe move together in the steel outer protective tube through the support.
The welded seams of the down-drain type heat insulation fixed joints have been inspected by an online continuous ultrasonic automatic flaw detector to ensure that the non-destructive low temperature of 100% of the spiral welded seam is 7 ° C, so the stress received by the directly buried pipeline will not be too great. Generally, the information of directly buried pipeline is No. 20 seamless steel pipe or Q235 pipe. When installing at a temperature above 15 ° C, it is not necessary to adopt any method for directly laying the heating pipeline (<100 ° C), and the pipeline is directly buried according to the method without compensation device. Underground, the pipeline can reach safe operation.
According to the medium temperature, high temperature and ultra-high temperature conditions of the steam medium, high-temperature insulation materials such as hydrophobic aluminum silicate needle punched blanket fiber felt or silica aerogel nano-insulation insulation felt can be used as a layer of insulation to reach the resistance. Begging for heat. The lower drainage type heat insulation fixed joint is composed of a working steel pipe, a heat insulation type inner movable support, a main insulation layer, an air layer or a vacuum layer, an outer steel pipe and an outer steel pipe anticorrosive layer.