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● On-site installation patch
Our company has a high-quality on-site construction team. With many years of practical experience, we have fully mastered all technical links in the industry cooperate with advanced on-site operation equipment to meet the demand on the spot.
Then the operation method of the sleeve + heat shrinkable tape
Features: limited by specifications, universal, well sealed. But it is easy to operate, can bear the axial force, the price is on the high side.
Requires a large operating space.
1. Install heat shrinkable tape
(1) Remove the heat-shrinkable tape parts, use gauze hand tools to roughen the heat-shrinkable parts of the PE outer sleeve.
(2) Preheat the pre-installed heat-shrinkable tape parts to about 60 ° C with a spray gun.
(3) Center the heat-shrinkable tape at the weld, with the adhesive layer inward.
(4) Place the fixing piece at the overlap of the heat shrinkable tape heat it evenly.
(5) After the fixed piece is cooled, use a blowtorch to heat it evenly the outer tube along the circle, so that the heat shrinkable band shrinks evenly, the edge of the hot melt adhesive overflows.
2. Airtightness test: apply air pressure of 0.02Mpa into the casing, apply soapy water to the welding part, no leakage is qualified.
(1) The two ends of the sleeve before the foaming are drilled separately: one pouring hole the other vent hole.
(2) The ratio of combined polyether isocyanate strictly implements the requirements of raw material manufacturers, the injection volume is calculated separately according to the different pipe diameters. The density of polyurethane is less than 60kg / m3. After filling, the pouring hole the vent hole are sealed with a plug.
Operation method of polyethylene electrofusion welding
Features: The construction method using electricity as energy has high process adaptability is convenient for field construction. The main material is prefabricated, convenient fast, has high axial tensile strength. The price is moderate, but there are strict requirements for clean dry work interface.
1. Thoroughly clean the electric fuse on the bushing before installation. Use the instrument to measure the electrofusion welded joint casing, the construction can be carried out after passing the test.
2. Installation of casing
(1) First clean the PE outer sleeve the joint sleeve is installed to remove dust oil.
(2) The joint sleeve is centered, tighten the joint sleeve with packing straps.
(3) Make vent holes double as punch holes.
(4) Set the fusing time turn on the power.
(5) Turn off the power.
3. Airtight experiment
Introduce air pressure of 0.02Mpa into the guest, apply soapy water to the welding part, no leakage is qualified.
4. Polyurethane foam (joint foam)
The ratio of the combined polyether isocyanate strictly implements the requirements of the raw material manufacturers. The density of polyurethane is less than 60kg / m3. After the injection material is dense, the pouring hole the exhaust hole are sealed with a plug. There are strict requirements for cleaning drying.
5. The nominal diameter of the pipe ≥ DN200 is connected by electrothermal fusion, the nominal diameter ﹤ DN200 is connected by heat shrinkable tape.