辽宁螺旋管
Your current location : Home >> News >> Industry News

Insulation treatment of anticorrosive insulation pipe

2019-12-27

1. Base treatment Before spraying construction, remove the residual ash other protrusions on the wall. If the wall of the double-sided submerged arc welding spiral steel pipe has a large area of defects damage, use 1: 3 cement mortar for leveling.


2. Before the polyurethane insulation material, use plastic film, waste newspaper, plastic board wooden board, plywood, etc. to cover protect unpainted objects such as windows, doors scaffolding. 3. Construction of polyurethane insulation layer on the wall Turn on the PU spraying machine to spray the insulation coating on the wall evenly. When the thickness reaches 0.5 ~ 1.0cm, insert the thickness benchmark according to the 45cm spacing plum blossom distribution, then continue to spray polyurethane Insulation material. The thickness of each spray should be controlled within 1cm. Try to avoid sagging when spraying.

4. Post-treatment of the polyurethane insulation layer After spraying the polyurethane insulation layer for 20 minutes, use a knife, hand saw other tools to start cleaning, trimming the shielding, protection parts protruding parts exceeding the specified thickness of 1cm.


5. Interface treatment The polyurethane insulation layer should be treated with interface mortar within 4 hours after spraying. The interface mortar can be evenly applied to the polyurethane insulation base with rollers.


6. Wipe the insulation slurry to level supplement the insulation. In the preparation of the insulation slurry anti-cracking mortar, a special person is needed to perform the mixing to ensure the mixing time the amount of water added are accurate. The quality of mixing at the construction site can be judged by observing its operability, anti-slip properties, paste state, its wet apparent density.


Construction technology of prefabricated polyurethane foam insulation pipe


When plastering, the flatness deviation should be greater than ± 4mm, it should be too thick, mainly for leveling, the thickness of the plaster should be slightly higher than the thickness of the ash cake, then use a bar ruler to flatten, use the trowel to repair the flatness; After 30 minutes of finding the surface layer, wipe the wall surface with a trowel, use the line ruler to test reach the acceptance standard. 7 Construction of anti-crack layer The insulation slurry is cured dried (it is appropriate to press the immobile surface by hand, generally about 3-7 days) the construction of the anti-crack protection layer can only be carried out after the quality of the insulation layer is accepted. When applying anti-crack mortar, evenly apply 3-4mm thick anti-crack mortar to the surface of the insulation layer, immediately press the cut alkali-resistant grid cloth into the anti-crack mortar with an iron trowel. The overlap width between adjacent grid cloths shall be less than 50mm, shall wrinkle, bulge warp the grid cloths. The first layer should be laid with double-layer grid cloth, the * layer should be laid with reinforced grid cloth, the reinforced grid cloth should be connected, then the second layer of ordinary grid cloth should be laid. Cracked mortar must be full


1. Reduce project cost. According to calculations by relevant departments, dual-control heating pipes can generally reduce the project cost by 25% (using FRP as the protective layer) 10% (using high-density polyethylene as the protective layer).


2. Low heat loss energy saving. Because the directly buried pipe adopts polyurethane foam as the thermal insulation material, its thermal conductivity is: λ = 0.013-0.03kcal / m · h · oC, which is much lower than other commonly used pipeline insulation materials in the past, the insulation effect Increase by 4-9 times. Furthermore, its water absorption rate is very low, about 0.2kg / m2. The reason for the low water absorption rate is that the closed cell rate of polyurethane foam is as high as about 92%. The low thermal conductivity low water absorption rate, together with the insulation layer the high-density polyethylene glass fiber reinforced plastic protective shell with good waterproof performance outside, have changed the condition of the traditional gutter laying heating pipe "wetted wet jacket", greatly reducing the heating pipe Overall heat loss, heat network heat loss is 2%, less than international


Label

Website of this article:http://en.lnjiuda.cn/news/425.html

Recent browsing:

Related products

Related news