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预制聚氨酯保温钢管从里到外分三层结构:
预制聚氨酯保温钢管从里到外分三层结构:
The prefabricated polyurethane insulated steel pipe is divided into three layers from the inside to the outside:
第一层:工作钢管层
First layer: working steel pipe layer
根据设计和客户的要求一般选用无缝钢管、螺旋钢管和直缝钢管。钢管表面经过先进的抛丸除锈工艺处理后，钢管除锈等级可达GB/T8923-1988标准中的Sa2级，表面粗糙度可达GB6060.5-88标准中R=12.5微米。
According to the design and customer requirements, seamless steel pipe, spiral steel pipe and straight seam steel pipe are generally selected. After the surface of the steel pipe is treated by the advanced shot blasting process, the rust removal grade of the steel pipe can reach the SA2 grade in GB / t8923-1988 standard, and the surface roughness can reach the r = 12.5 μ m in gb6060.5-88 standard.
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形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"。
The rigid polyurethane foam plastic is injected into the cavity formed between the steel pipe and the outer sheath by the high-pressure foaming machine, which is commonly known as "tube in tube foaming".
第三层:高密度聚乙烯保护层:
The third layer: HDPE protective 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，无毒，手感似蜡，具有优良的耐低温性能，最低使用温度可达-70~-100℃，化学稳定性好，能耐大多数酸碱的侵蚀(不耐具有氧化性质的酸)，常温下不溶于一般溶剂，吸水性小，但由于其为线性分子可缓慢溶于某些有机溶剂，且不发生溶胀，电绝缘性能优良。其作用一是保护聚氨酯保温层免遭机械硬物破坏，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标准。
Prefabricated into a certain wall thickness of black or yellow polyethylene plastic pipe. Polyethylene is odorless, nontoxic, waxy, and has excellent low-temperature resistance. The minimum operating temperature can reach - 70 ~ - 100 ℃. It has good chemical stability and can withstand most of the acid-base corrosion (not resistant to the acid with oxidation property). It is insoluble in general solvents at room temperature and has low water absorption. However, because it is a linear molecule, it can slowly dissolve in some organic solvents without swelling, and has excellent electrical insulation performance Liang. Its function is to protect polyurethane insulation layer from mechanical hard damage, and to prevent corrosion and water. High density polyethylene polyurethane foam heat preservation steel pipe shall comply with the standards of SY / t114-2000 and SY / t115-2001.
The prefabricated polyurethane insulated steel pipe is divided into three layers from the inside to the outside:
第一层:工作钢管层
First layer: working steel pipe layer
根据设计和客户的要求一般选用无缝钢管、螺旋钢管和直缝钢管。钢管表面经过先进的抛丸除锈工艺处理后，钢管除锈等级可达GB/T8923-1988标准中的Sa2级，表面粗糙度可达GB6060.5-88标准中R=12.5微米。
According to the design and customer requirements, seamless steel pipe, spiral steel pipe and straight seam steel pipe are generally selected. After the surface of the steel pipe is treated by the advanced shot blasting process, the rust removal grade of the steel pipe can reach the SA2 grade in GB / t8923-1988 standard, and the surface roughness can reach the r = 12.5 μ m in gb6060.5-88 standard.
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形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"。
The rigid polyurethane foam plastic is injected into the cavity formed between the steel pipe and the outer sheath by the high-pressure foaming machine, which is commonly known as "tube in tube foaming".
第三层:高密度聚乙烯保护层:
The third layer: HDPE protective 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，无毒，手感似蜡，具有优良的耐低温性能，最低使用温度可达-70~-100℃，化学稳定性好，能耐大多数酸碱的侵蚀(不耐具有氧化性质的酸)，常温下不溶于一般溶剂，吸水性小，但由于其为线性分子可缓慢溶于某些有机溶剂，且不发生溶胀，电绝缘性能优良。其作用一是保护聚氨酯保温层免遭机械硬物破坏，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标准。
Prefabricated into a certain wall thickness of black or yellow polyethylene plastic pipe. Polyethylene is odorless, nontoxic, waxy, and has excellent low-temperature resistance. The minimum operating temperature can reach - 70 ~ - 100 ℃. It has good chemical stability and can withstand most of the acid-base corrosion (not resistant to the acid with oxidation property). It is insoluble in general solvents at room temperature and has low water absorption. However, because it is a linear molecule, it can slowly dissolve in some organic solvents without swelling, and has excellent electrical insulation performance Liang. Its function is to protect polyurethane insulation layer from mechanical hard damage, and to prevent corrosion and water. High density polyethylene polyurethane foam heat preservation steel pipe shall comply with the standards of SY / t114-2000 and SY / t115-2001.
