First, let's take a look at the technological process of directly buried insulated steel pipes. First, let's take a look at the insulation layout of directly buried insulation pipes. They are divided into three parts according to different steps: drag reduction layer, heat expansion zone of material steel tube, cold and free movement of contraction belt, pure hard insulation layer, high temperature resistance, interface temperature between green insulation layer, foam free carbonized steel pipe, normal movement of transmission medium, separation, reflection layer and green. The color foam material does not enter the pure hard high temperature resistant layer, and reflects part of the heat of the high temperature resistant layer. It's because they have different external coatings.

直埋保溫管是一種保溫性能好，加可靠，工程造價低的直埋預制保溫管。如此避免了外觀溫度轉變產生的外觀變形使外觀出現(xiàn)裂縫。標準彎頭角度：30度、45度、60度、90度

Directly buried insulation pipe is a kind of prefabricated insulation pipe with good thermal insulation performance, safety and reliability, and low engineering cost. In this way, the appearance deformation caused by the appearance temperature transformation is avoided, and the appearance cracks appear. Standard elbow angle: 30 degrees, 45 degrees, 60 degrees, 90 degrees

聚氨酯預制直埋保溫彎頭應用：廣泛用于液體、氣體的輸送管網，化工管道保溫工程石油、化工、集中供、空調通風管道、市政工程管道轉彎處中。與空氣層結構相比，在同等保溫厚度下可降低外壁溫度8-13°c。聚氨酯泡沫保溫無縫鋼管聚氨酯直埋保溫管廣泛應用于不同產品中。鋼套鋼直埋蒸汽保溫管保溫管（包括彎頭、三通、四通）是一種保溫性能好，加可靠，工程造價低的直埋預制保溫管。防水、耐腐蝕、耐老化：中頻加熱法利用管道余熱同時固化兩者，不需要分別涂覆和固化。外部滑動型。

Polyurethane prefabricated directly buried insulation elbow application: widely used in liquid and gas transmission pipe network, chemical pipeline insulation engineering, petroleum, chemical, centralized supply, air conditioning and ventilation pipe, municipal engineering pipeline bend. Compared with the air layer structure, the outer wall temperature can be reduced by 8-13 ° C under the same insulation thickness. Polyurethane foam insulation seamless steel tube price polyurethane directly buried insulation pipe is widely used in different products. Steel sleeve steel directly buried steam insulation pipe (including elbow, tee, cross) is a kind of directly buried prefabricated insulation pipe with good thermal insulation performance, safety and reliability, and low engineering cost. Waterproof, corrosion resistance, aging resistance: medium frequency heating method uses waste heat of pipeline to solidify both at the same time, without coating and curing separately. External sliding type.

保溫層材料為密度60kg/m380kg/m3的硬質聚氨酯泡沫，充分添滿鋼管與套管之間的間隙，并具有一定的粘接強度，使鋼管、外套管及保溫層三者之間形成一個牢固的整體。聚氨酯泡沫具有良好的機械性能和絕熱性能，通常情況下可耐溫120℃,通過改性或與其它隔熱材料組合可耐溫180℃。

The insulating layer material is a rigid polyurethane foam with a density of 60kg/m3 to 80kg/m3. The gap between the steel pipe and the casing is fully filled and has certain bonding strength, so that a solid whole can be formed between the three parts of the steel pipe, the outer sleeve pipe and the insulation layer. Polyurethane foam has good mechanical properties and thermal insulation properties. Under normal circumstances, it can withstand temperatures of 120 degrees Celsius. It can withstand temperature of 180 degrees by modifying or combining with other insulation materials.

保溫性能好，熱損失僅為傳統(tǒng)管材的25%，長期運行可節(jié)約大量能源，顯著降低能源成本。具有很強的防水和耐腐蝕能力，不需附設管溝，可直接埋入地下或水中，施工簡便迅速，綜合造價低。在低溫條件下也具有良好的耐腐蝕和耐沖擊性，可直接埋入地下凍土。使用壽命可達30-50年，正確的安裝和使用可使管網維修費用極低。可設置報警系統(tǒng)。

The heat loss is only 25% of that of the traditional pipe material. The long-term operation can save a lot of energy and significantly reduce the energy cost. It has strong waterproof and corrosion resistance, and can be directly buried in the ground or water without pipe trench. The construction is simple and rapid, and the comprehensive cost is low. It also has good corrosion resistance and impact resistance at low temperature, and can be directly buried in the underground frozen soil. The service life can be up to 30-50 years, and the maintenance cost of pipe network can be very low if it is installed and used correctly. Alarm system can be set.