聚乙烯聚氨酯保温钢管是什麼资料
What information is polyethylene polyurethane insulating steel pipe?
聚乙烯聚氨酯保温钢管是依据保温钢管的外壳来命名的，外层是聚乙烯外壳。
Polyethylene polyurethane insulating steel pipe is named after the outer shell of the insulating steel pipe, and the outer shell is polyethylene.
一层：任务钢管层
Layer 1: Task Steel Tube Layer
依据设计和客户的要求普通选用无缝钢管、螺旋钢管和直缝钢管。钢管外表经过的抛丸除锈工艺处置后，钢管除锈等级可达GB/T8923-1988规范中的Sa2级，外表粗糙度可达GB6060.5-88规范中R=12.5微米。
Seamless steel pipe, spiral steel pipe and straight seam steel pipe are generally selected according to design and customer requirements. After treatment by advanced shot peening rust removal process, the steel tube rust removal grade can reach Sa2 level in GB/T8923-1988 specification, and the surface roughness can reach R=12.5 micron in GB6060.5-88 specification.
第二层：聚氨酯保温层：
Second layer: polyurethane insulation layer:
用高压发泡机在钢管与外护层之间构成的空腔中一次性注入硬质聚氨酯泡沫塑料原液而成，即俗称的“管中管发泡”。
High-pressure foaming machine is used to inject rigid polyurethane foam plastics into the cavity formed between the steel pipe and the outer sheath at one time, which is commonly known as "tube-in-tube foaming".
第三层：高密度聚乙烯维护层：
Layer 3: High Density Polyethylene Maintenance Layer:
预制成一定壁厚的黑色或黄色聚乙烯塑料管材。聚乙烯无臭，，手感似蜡，具有优良的耐高温功能，低运用温度可达-70～-100℃，化学波动性好，能耐大少数酸碱的腐蚀(不耐具有氧化性质的酸)，常温下不溶于普通溶剂，吸水性小，但由于其爲线性分子可迟缓溶于某些无机溶剂，且不发作溶胀，电绝缘功能优良。其作用一是维护聚氨酯保温层免遭机械硬物毁坏，二是防腐、防水。高密度聚乙烯聚氨酯发泡保温钢管执行：SY/T114-2000和SY/T115-2001规范。
Prefabricated black or yellow polyethylene plastic pipes with a certain wall thickness. Polyethylene is odorless, non-toxic, waxy-like and has excellent high temperature resistance. The lowest operating temperature can reach - 70 ~100 C. It has good chemical fluctuation, and can resist corrosion of a large number of acids and bases (not resistant to oxidizing acids). It is insoluble in ordinary solvents at room temperature and has little water absorption, but it can be slowly dissolved in some inorganic solvents due to its linear molecule, and does not swell, and has electrical insulation function. Excellent. Its function is to maintain the polyurethane insulation layer from the destruction of mechanical hard objects, and the second is anti-corrosion and waterproof. High density polyethylene polyurethane foamed insulation steel pipe execution: SY/T114-2000 and SY/T115-2001 specification.
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