1 yellow jacket insulation pipe, buried pipe insulation can be used in heating network, geothermal, refrigeration, municipal construction, oil and other industrial sectors, the protective layer can be used for adding flame retardant overhead pipes. 2, the burial depth must ensure safe passage of trucks carrying ten tons, to minimize heat loss, should be laid in the following ice lines, different regions should specifically address different situations in the region. 3, trench excavation size should guarantee between the tubes, leaving space between the pipe and the trench 200-250㎜ wall for on-site installation and fitting process, ditch brick soil compaction, sand bedding is available if necessary. 4, when the buried pipe across the road, which laid a constant depth, but not complex soil backfill trench made in the form of blanket reinforced concrete slab or concrete casing process for the trench. 5, between the tube and pipe, welded (glass pipe connection technology and standard pressure test set separately) after pipe installation, pressure test (9㎏ / cm?) Within 10 minutes buck 0.5 kg / cm? For qualified , pipeline welding should be installed and maintained in dry ditch, make joint fully cured after (48 hours) before the pipe into the ditch, so do not make the joint treatment into the ditch, soaked in water pipe and the fitting part reduce waterproof, corrosion, insulation effect. 6, pipe insulation during installation, you can install one side, while doing joint process can also be fully installed pressure test before making a joint process. (1) In order to ensure the joint waterproof, corrosion, insulation effect, to ensure that the joint site conditions are necessary. (2) joint field temperatures, the operation should be maintained above 10 ℃, the minimum of not less than 5 ℃, so the winter is unfit for joint treatment, joint treatment unfit for rainy days, wet ditch, the water can not do joint processing . For details, see: http: //www.rbffbw88.com/rbffbw-Products-9779964/