Attention to detail in the design and construction process of direct buried insulation pipe The high temperature prefabricated direct buried insulation pipe is composed of steel pipe, FRP inner sheath and glass fiber reinforced plastic outer casing. It is characterized by: high temperature insulation insulation layer, lubricating layer and elastic seal. Recently, due to the relatively high turnover rate, the direct buried heating technology started late in China. From the perspective of quality problems in engineering practice, the following issues should be paid attention to in design and construction:
In the design and construction of direct buried insulation pipe, we must truly understand that the direct buried laying mode of the heating pipe is divided into two modes: compensation direct buried laying and uncompensated direct buried laying. It is true that the working principle and characteristics of the two modes are mastered. Its application, in order to make reasonable selection in design, construction is safe, reliable and economical.
1. Directly burying the insulation pipe must first grasp the concept: the compensation direct burial method is to solve the thermal elongation of the pipeline through the pipeline natural compensation and compensator (such as square and bellows compensator), so that the thermal stress is minimized. Uncompensated direct burial, simply means that the pipe does not have any compensation measures when heated, but relies on the strength of the pipe itself to absorb thermal stress.
2. The basic principle of the direct buried thermal insulation pipe without compensation laying method: When installing the pipeline, firstly heat the pipeline to a certain temperature, then weld the pipeline to fix. When the pipeline returns to the installation temperature (the temperature is lowered), the pipeline is pre-accepted. Pulling stress. When the pipeline is working hot, the pipeline stress is zero with the increase of temperature. When the temperature rises, the compressive stress of the pipeline increases. When the temperature rises to the working temperature, the compressive stress (thermal stress) of the pipeline is still less than allowable. stress. In this way, the pipeline can work without the compensation device. This uncompensated method applies the fourth strength theory. It is necessary to preheat the pipeline during construction. The construction is troublesome, but there are a lot of engineering practices at home and abroad, and the theoretical calculation is reliable and can ensure safety. Another non-compensation method is the calculation method and stress classification proposed by Beijing Gas Thermal Design Institute in China in recent years. The stability analysis is applied and the third strength theory is applied. This way gives full play to the plasticity potential of steel, and it is convenient to construct and does not require preheating.
3. The two laying depths consider different factors.
Prefabricated direct buried insulation pipe
The high-temperature prefabricated direct-buried insulation pipe is composed of a steel pipe, a FRP inner sheath and a FRP outer casing, and is characterized in that it further comprises a high-temperature insulation insulation layer, a lubrication layer and an elastic seal. The utility model effectively solves the problems of heat preservation, sliding lubrication and waterproofing of the bare pipe end of the prefabricated direct buried heat insulation pipe for the high temperature heat transfer in the urban central heating system at 130°C-600°C.
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