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.
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
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.
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.
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.
