Because the rigid foam insulation layer of polyurethane thermal insulation steel pipe is closely bonded to the outer skin of the steel pipe, it isolates the infiltration of air and water, and can play a good role in anti-corrosion. At the same time, its foaming pores are closed and its water absorption is very small. High density polyethylene shell and FRP shell have good anticorrosion, insulation and mechanical properties. Therefore, the outer skin of working steel pipe is difficult to be eroded by external air and water. As long as the internal water quality of the pipeline is well treated, the service life can reach more than 50 years, which is 3 or 4 times longer than that of traditional trench laying and overhead laying. The superiority of polyurethane thermal insulation steel pipe in our factory for nearly ten years, after digesting and absorbing this advanced skill, the skilled personnel of heating engineering in our country are promoting the laying skills of domestic pipe network to a higher level. (3) the protective shell of thermal insulation steel pipe is made of high density polyethylene or glass fiber reinforced plastic.
The manufacturer of plastic sleeve steel directly buried insulation pipe introduces that polyurethane insulation pipe has good mechanical strength and excellent corrosion resistance. Di first layer: working steel pipe layer, according to the design and customer requirements generally choose seamless spiral welded pipe) and straight welded pipe. After the steel pipe surface is treated by xian shot blasting derusting process, the steel pipe rust removal grade can reach GB8923, and the surface roughness can reach R = micron in the standard. 1. The polyurethane directly buried insulation pipe has good thermal insulation performance, and the heat loss is only 25% of that of the traditional pipe. Long-term operation can save a lot of energy and significantly reduce energy costs. 2. It has strong waterproof and corrosion resistance, does not need to attach pipe ditch, can be directly buried in the ground or water, the construction is simple and rapid, and the comprehensive cost is low. 3.
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The temperature in the shed often changes with the weather and season. When in use, users can add a series of protective measures to keep the temperature in the greenhouse constant according to the changing law of the greenhouse temperature. The daily temperature difference is large in sunny days and small in cloudy and rainy days. The lower the temperature, the higher the daily temperature, and vice versa. In addition, users can also strengthen the regulation of temperature in the greenhouse according to the requirements of suitable growth temperature of early-maturing vegetable varieties. There are also differences in temperature requirements among different crops. Users can adjust according to the actual conditions and crop requirements. For example, it is generally not ventilated after the seedlings are planted and before slowing down, so as to increase the mild temperature in the interior of the shed and facilitate the growth of crops. Not only that, users also have to adjust according to the conditions of the season, because of weak light in early spring, the warming effect in the greenhouse is poor, so the measures of covering plastic film in the greenhouse and small arch shed can be adopted to improve the warming and heat preservation effect.
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The thermal insulation structure of steel jacket steel composite thermal insulation steel pipe for prefabricated directly buried high temperature steam can be divided into two categories according to different sliding modes: 1. Internal sliding: the thermal insulation structure is composed of working seamless steel pipe, aluminum silicate, drag reduction layer, microporous calcium silicate, heat insulation layer, stainless steel fastening steel strip, aluminum foil reflection layer, polyurethane insulation layer, outer spiral steel pipe and external anti-corrosion layer. Hebei Hongke sliding thermal insulation steel pipe is composed of conveying medium steel pipe + composite silicate or microporous calcium silicate + rigid polyurethane foam plastic + outer spiral steel pipe + glass steel shell anticorrosion protective layer structure. The heat preservation treatment technology of all kinds of pipe joints is mature and the quality is reliable. Anti-corrosion coating: protect the outer steel pipe from corrosion, prolong the service life of steel pipe
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