Pipe bundle leakage alarm directly buried prefabricated insulation layer independently sealed steam pipe and manufacturing method

Abstract

The invention relates to a directly-buried prefabricated independently-sealed steam tube with a tube bundle leakage warning function and a heat-insulation layer, and a method for manufacturing the directly-buried prefabricated independently-sealed steam tube. The directly-buried prefabricated independently-sealed steam tube comprises a sealed corrugated tube assembly, a steel guide tube, the heat-insulation layer, a plurality of leakage warning indicator tubes, an outer protective steel tube assembly, a corrugated tube assembly for a steel guide tube port and a working steel tube. The sealed corrugated tube assembly is hermetically welded with one end of the steel guide tube, the heat-insulation layer is arranged on the outside of the steel guide tube, the leakage warning indicator tubes transversely penetrate a space between the steel guide tube and the outer protective steel tube assembly, the corrugated tube assembly for the steel guide tube port is nested in a gap between the steel guide tube and the sealed corrugated tube assembly, and the working steel tube is nested in the steel guide tube. Compared with the prior art, the directly-buried prefabricated independently-sealed steam tube and the method have the advantages that the directly-buried prefabricated independently-sealed steam tube is provided with the permanent heat-insulation layer and is independently sealed, so that the heat-insulation performance of the heat-insulation tube can be guaranteed for a long time; overtemperature-preventive measures are adopted for the outer surface of the directly-buried prefabricated independently-sealed steam tube, and accordingly the directly-buried prefabricated independently-sealed steam tube is long in service life; the directly-buried prefabricated independently-sealed steam tube has port leakage warning and tube bundle positioning functions, so that a leakage state can be monitored in real time; the directly-buried prefabricated independently-sealed steam tube is provided with the corrugated tube assembly for the steel guide tube port and is convenient to mount.

Description

technical field [0001] The invention relates to a direct-buried prefabricated heat-insulating steam pipe whose working medium is steam, in particular to a direct-buried prefabricated heat-insulated steam pipe with independent sealing of the heat-insulation layer, and functions of pipe bundle leakage alarm and positioning and a manufacturing method thereof. Background technique [0002] At present, most of the direct-buried prefabricated heat-insulating steam pipes used in engineering are "steel-sheathed steel" pipes that use calcium silicate tiles, centrifugal glass wool, rock wool or aluminum silicate wool for heat insulation. Products with traditional structural methods generally do not provide independent sealing protection for the insulation layer of each pipe. During delivery, storage, and construction, if it encounters rainy weather or the groundwater level in the construction environment exceeds the pipeline laying elevation, the insulation layer of the pipeline will ...

AI Technical Summary

Problems solved by technology

Products with traditional structural methods generally do not provide independent sealing protection for the insulation layer of each pipe. During delivery, storage, and construction, if it encounters rainy weather or the groundwater level in the construction environment exceeds the pipeline laying elevation, the insulation layer of the pipeline will A large area may be flooded, resulting in a large amount of moisture discharge and a long time during the pipeline heating process, which will cause the pipeline insulation layer to suffer varying degrees of damage during the initial heating period. Visually observe the intact state of the insulation layer. Even if the insulation layer is found to be damaged, it is impossible to repair the reality. Many direct-buried steam pipes constructed under conditions such as high water level, rainy season, tap water, and sewage pipeline leakage have been in poor insulation since the beginning of operation. state, resulting in large heat loss of the pipeline and high temperature of the outer surface of the pipeline, which not only wastes energy, but also gradually leads to long-term over-temperature damage to the outer sheath, seriously affecting the service life of the directly buried steam pipe

[0003] During the operation of directly buried steam pipes, due to reasons such as construction and the quality of the protective layer, the joint position of the outer protective steel pipe of the pipe may leak, causing groundwater to enter the insulation layer, and the pipeline has severe moisture discharge. Due to the inability to accurately locate the leak point, the drainage The tide time is generally very long. For several days or weeks, the insulation layer of the affected pipelines will be damaged to varying degrees and cannot be repaired. Even if the leak point is found and the leakage problem is solved, the damaged insulation layer cannot be repaired, resulting in Once a leak occurs, the insulation performance and life will be damaged once, and the final result is that the direct buried steam pipe will be decommissioned early

The ubiquity of the above practical problems makes it difficult for direct-buried prefabricated thermal insulation steam pipes without reliable sealing of the insulation layer to be really suitable for high water level laying environments or steam pipeline projects constructed in rainy seasons, and it is also difficult to use them in such environments. Maintain long-term, stable operation and reach the expected service life

Images