High density polyethylene (HDPE) prefabricated directly buried insulating pipes are suitable for insulating and cooling projects of various mediums in the range of - 50 ~150 C. It is widely used in urban central heating, heating room, cold storage, coal mine, petroleum port, chemical industry and other industries of thermal insulation and cooling engineering. However, the weather resistance and heat resistance of HDPE are lower than that of FRP. High density polyethylene (HDPE) has a heat resistance of 60 - 70 degrees, while glass fiber reinforced plastics (FRP) has a heat resistance of 100 - 120 degrees. Therefore, attention should be paid to its application.
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1. Black jacket polyethylene exterior guard pipe is easy to aging, such as open storage should be covered with tarpaulin and other things, the stacking place should be far away from high heat source and fire source, after making insulating pipe, prevent sunshine and sudden cooling, otherwise polyethylene pipe is easy to crack, affecting product performance and service life.
2. In the process of transportation and pipeline piercing, we should prevent rough handling, too thin, too hard and too hard hooks, otherwise, polyethylene pipes may be easily broken, scratched or torn.
3. Pipe wall thickness can be adjusted, wall thickness and color can be consumed according to user's request. Because of the difference of pipe wall thickness, the thickness of insulation layer is about a number, which should be calculated according to the practical thickness.
4. The supporting brackets, plastic plugs, flanges at both ends, welding rods, welding torches, thermal shrinkage bands, etc. are complete.
E. The allowable bias in the table is formulated in accordance with CJ/114-2000 industry specifications.
The calculating formula is as follows: when the outer diameter is less than 400 mm, the sum of the upper and lower deviations is equal to 0.1 x nominal wall thickness + 0.2
When the outer diameter is greater than 400 mm, the sum of the upper and lower deviations is equal to 0.15 x nominal wall thickness + 0.2.
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