Call Us

+86 189 0200 6688

Home > News > Industry News

What are thermal insulation pipe and spiral steel pipe ?

Nov. 30, 2019

Shall i can introduce something about the thermal insulation pipe ? If yes, now i will begin. Our company is a professional thermal insulation pipe factory. The spiral steel pipe and thermal Insulation Pipe are our company’s main product. But also we are one of the most professional supplier in our country. Because our products are of good quality and excellent price, they have won unanimous praise from people inside and outside the industry.

 Thermal insulation pipe.png

Thermal insulation pipe is the abbreviation of thermal insulation pipe. Thermal insulation pipe is used for the transportation of liquid, gas and other media. It is used for thermal insulation of pipelines in petroleum, chemical industry, aerospace, hot spring ~ military, central heating, central air conditioning, municipal and other thermal insulation projects. Heat preservation pipes are suitable for conveying various media in the range of-50℃-150. They are widely used in central heating, cold supply and hot oil transportation, as well as in heat preservation and cold preservation projects in warm rooms, cold storage, coal mines, petroleum, chemical and other industries. The thermal insulation structure of steel sleeve and steel composite thermal insulation pipe can be divided into two categories according to different sliding modes: Firstly is Internal sliding type: the thermal insulation structure consists of working steel pipe, aluminum silicate, drag reduction layer, microporous calcium silicate, thermal insulation layer, stainless steel fastening steel belt, aluminum foil reflective layer, polyurethane thermal insulation layer, outer steel pipe and outer anticorrosive layer. The internal sliding type thermal insulation steel pipe is composed of steel pipe conveying medium composite silicate or microporous calcium silicate+rigid polyurethane foam outer steel pipe+glass fiber reinforced plastic shell anti-corrosion protective layer structure. All kinds of pipe joints have mature heat preservation technology and reliable quality. Second is external sliding type: the thermal insulation structure consists of working steel pipe, glass wool thermal insulation layer, aluminum foil reflective layer, stainless steel fastening steel belt, sliding guide bracket, air thermal insulation layer, external protective steel pipe and external anti-corrosion layer.

 Thermal insulation pipe2.png

Spiral steel pipes feed the strip steel into the welded pipe unit, and the strip steel is rolled by multiple rollers, and gradually rolled up to form a round tube blank with an open gap. the reduction of the extrusion roller is adjusted to control the weld gap to 1-3 mm and make both ends of the joint flush. If the gap is too large, the proximity effect will be reduced, the eddy current heat will be insufficient, and the weld grain will not be bonded well indirectly, resulting in incomplete fusion or cracking. If the gap is too small, the proximity effect will be increased, and the welding heat will be too large, resulting in welding seam burning. Or the weld seam is extruded and rolled to form a deep pit, which affects the surface quality of the weld seam.  After the two edges of the tube blank are heated to the welding temperature, common metal grains are formed to permeate and crystallize with each other under the extrusion of the extrusion roller, and finally a firm weld is formed. If the extrusion force of spiral steel pipe is too small, the number of common crystals will be small, the strength of weld metal will decrease, and cracking will occur after being stressed. If the extrusion force is too high, molten metal will be extruded out of the weld, which will not only reduce the weld strength, but also produce a large number of internal and external burrs, and even cause defects such as weld overlap.