理解聚氨酯发泡保温钢管的用途
Understanding the Use of Polyurethane Foamed Insulation Pipe
在、小直径传热原油或加热管道中，爲了增加管道对土壤的散热，在管道内部添加了一个保温复合层。常用的保温资料是硬质聚氨酯泡沫，温度范围爲-185120°C。材质质地柔软。爲了进步其强度，在绝缘层的外侧施加一层高密度聚乙烯以构成复合构造，以避免地下水浸透到保温层中。
In order to increase the heat dissipation of pipeline to soil, an insulating composite layer is added to the pipeline interior in small diameter heat transfer crude oil or heating pipeline. The commonly used thermal insulation material is rigid polyurethane foam with a temperature range of -185 to 120 degrees C. The material is soft. In order to improve its strength, a layer of high density polyethylene (HDPE) is applied to the outer side of the insulating layer to form a composite structure so as to avoid the infiltration of groundwater into the insulating layer.
高压成品聚氨酯发泡设备用于在钢管的表面面停止抛丸处置，在外维护管的内外表停止电晕处置，以进步保温管的粘接功能。保温层资料是硬质聚氨酯泡沫，密度爲60kg / m380kg / m3，填充了钢管与套筒之间的间隙并具有一定的粘接强度，这使得钢管、外壳和保温层。构成一个坚实的全体。聚氨酯泡沫具有良好的机械功能和隔热功能。它通常可以接受120°C的温度。经过改性或与其他绝缘资料组合，它可以耐温180°C。
High-pressure polyurethane foaming equipment is used to stop shot blasting on the surface of steel pipe and corona treatment on the inner and outer surface of external maintenance pipe to improve the bonding function of insulation pipe. The insulation material is rigid polyurethane foam. The density is 60kg / m3 to 80kg / m3, filling the gap between the steel tube and the sleeve and having a certain bonding strength, which makes the steel tube, shell and insulation layer. Construct a solid whole. Polyurethane foam has good mechanical function and thermal insulation function. It usually accepts a temperature of 120 degrees C. After modification or combination with other insulation data, it can withstand 180 C temperature.
预制聚氨酯保温钢管从内到外分爲三层：
Prefabricated polyurethane insulating steel pipes are divided into three layers from inside to outside.
一层：任务钢管层
Layer 1: Task Steel Tube Layer
依据设计和客户要求，通常运用无缝钢管、螺旋钢管和直缝钢管。钢管外表经过初级喷丸除锈处置后，按GB / T8923-1988规范，钢管除锈等级到达Sa2级，GB6060.5-88规范中外表粗糙度可达R = 12.5微米。
According to the design and customer requirements, seamless steel pipe, spiral steel pipe and straight seam steel pipe are usually used. After primary shot peening treatment, according to GB/T8923-1988 specification, the steel tube rust removal grade reaches Sa2 grade, and the surface roughness in GB6060.5-88 specification can reach R = 12.5 micron.
第二层：聚氨酯保温层：
Second layer: polyurethane insulation layer:
高压发泡机用于将硬质聚氨酯泡沫原料注入到在钢管和外护套之间构成的空腔中，这通常被称爲“管管发泡”。
The high pressure foaming machine is used to inject rigid polyurethane foam material into the cavity formed between the steel pipe and the outer sheath, which is usually called "tube foaming".
第三层：高密度聚乙烯维护层：
Layer 3: High Density Polyethylene Maintenance Layer:
预成型爲具有一定壁厚的黑色或黄色聚乙烯塑料管。聚乙烯无味，，蜡质，具有优异的耐高温性，可在-70-100°C的高温下运用。它具有良好的化学波动性，并且耐大少数酸和碱（不耐氧化性）。酸）在常温下不溶于普通溶剂，吸水率低，但由于它是线性分子，它可以迟缓溶解在一些无机溶剂中，不溶胀，并具有优异的电绝缘功能。它的作用是维护聚氨酯保温层免受机械硬物损伤，第二是防腐蚀、防水。高密度聚乙烯泡沫塑料保温钢管执行：SY / T114-2000和SY / T115-2001规范。
The preform is a black or yellow polyethylene plastic pipe with a certain wall thickness. Polyethylene is odorless, non-toxic, waxy and has excellent high temperature resistance. It can be used at high temperatures ranging from - 70 to - 100 degrees C. It has good chemical fluctuation and resistance to a large number of acids and bases (oxidation resistance). Acids) are insoluble in ordinary solvents at room temperature and have low water absorption, but because they are linear molecules, they can be slowly dissolved in some inorganic solvents, do not swell, and have excellent electrical insulation function. Its function is to maintain polyurethane insulation layer from mechanical hard damage, the second is anti-corrosion, waterproof. High density polyethylene foam insulation steel pipe execution: SY/T114-2000 and SY/T115-2001 specification.
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