Execution of GB/T29047-2012 "High-density Polyethylene external care tube Polyurethane Polyette Plastic Prefabricated Inspection Pipe" standard or EN253 "Overall prefabricated insulation system for groundwater thermal pipe network, which is worked by work steel pipes, polyurethane insulation layers and polyethylene coat tubes. Institutious insulation pipe "
1. Steel pipes can be used: seamless steel pipes, spiral steel pipes and electric welding steel pipes made from 20#and Q235 steel, and the performance indicators meet the national and oil Ministry of Petroleum;
2. The seamless steel pipe adopts the GB/T8163-2008 standard;
3. The spiral steel pipe uses SY/T5037-2000, GB/T9711.1-2011, and the welding steel pipes use GB/T3091-2001.
Under normal circumstances, the DN20-DN150 uses seamless or welded steel pipes. The spiral steel pipes above the DN200 can also be used as required by the user's requirements.
The steel pipe parts adopts a pushing or suppression process.
Execution standard:
1. Steel-to-welded pipe parts GB/T12459-2005 Steel plate-to-steel plate-to-welded pipe parts GB/T13401-2005 Steel bending pipe SY/T5257-2004;
2. The jacket pipe executes GB13018-91 "Polyethylene (PE) pipe outer diameter and wall thickness limit deviation" standard;
Polyurethane direct -buried thermal preservation technical parameters:
Axial shear strength: ≥0.12MPa (23 ± 2 ° C), continuous operating temperature: 140 ° C max, peak operating temperature: 150 ° C max, service life: ≥ 30 years Life is related to water quality), the length of the pipeline is 200mm-400mm, the diameter range: DN20-DN1200, the average pore diameter: ≤0.5mm, the closing rate ≥88%, the density of any position ≥60㎏/m3, the pressure resistance strength strength ≥0.3MPa (under 10%deformation conditions), water absorption rate: ≤10%(100 ° C boiling water 90 minutes).
High -density polyethylene external care tube:
Density ≥9503/m3 (20 ℃), carbon black content: 2.5%± 0.5%(mass percentage), thermal conductivity: 0.43W/(m. ℃), thermal expansion coefficient: 18010-6 (1 ℃), melting polyurethane Directly buried thermal insulation tube index: 0.50 ~ 0.70g (MFI 190 ° C/5kg), stretching strength: ≥19MPa, fracture elongation: ≥350%, environmental stress cracking: ≥200h.
Storage method:
1. The ground should be flat, without gravel and other hard impurities.
2. Destroy the drainage ditch when placing the venue, and water should not be accumulated in the venue.
3. The pipe custard should be set up in the stacking site, and the external care tube should be 150mm higher than the ground.
4. The height of the insulation pipe should not be greater than 2 meters.
5. The thermal insulation tube shall not be covered with tunnels when the sun is shot, rain and soaking, and open -air.
