Preparation for Using Coated Composite Pipes
Release time:
2020-11-07
Before installing the coated composite piping, the following conditions must be met: All relevant technical documents, including construction drawings, must be complete and have undergone technical briefing. A visual inspection of the coated pipes and fittings required for installation shall be conducted, and the product certificates, specifications, models, types, and quantities shall be verified.
Before installing the plastic-coated composite pipes, the following conditions must be met: All relevant technical documents, including construction drawings, must be complete and have undergone technical briefing. A visual inspection shall be conducted on the plastic-coated pipes and accessories required for installation, and the product certificates, specifications, models, types, and quantities shall be verified.
Construction personnel should be familiar with the performance of coated composite pipe fittings and relevant technical documentation, and master basic operational skills. The following construction tools are recommended for coated steel pipes: a metal saw for cutting; a dedicated grooving machine for creating grooves; a pipe bender for cold bending; an electric threading machine for machining pipe threads; a steel blade for deburring and chamfering pipe ends; and a small brush or toothbrush for applying high-strength, solvent-free liquid epoxy resin coatings.
Grooved Connection for Coated Composite Pipes ： Pipe fittings shall comply with the requirements of the “Pipeline Trench Standards.” The coated composite pipes used for installation must meet the requirements of the product standards and have grooves properly pressed before coating. The working pressure of groove-type pipe fittings for coated composite pipes should match the working pressure of the coated steel pipes. Hot-water transmission groove-type pipe fittings shall be equipped with heat-resistant rubber sealing rings.
Moreover, during on-site processing of bevels and installation of coated composite pipes, the construction shall comply with the following requirements: prefabricated coated steel pipes and their grooved fittings should be prioritized; the length of connected pipe sections shall be the net length at both ends minus... 6-8mm , the connection gap is 3 ~ 4mm When cutting pipes, the cross-section should be perpendicular to the axis. The allowable deviation is: for pipe diameters not exceeding... 100mm At that time, the deviation is no more than 1mm ; diameter greater than 125mm At that time, the deviation is no more than 1.5mm；
The sharp corners on the inner and outer walls of the end sections of coated composite pipes shall be smoothly rounded. When using a dedicated grooving machine to create grooves, the standard pressure roller for coated steel pipes with grooves shall be used. 90 The bevel depth and width shall comply with... CJ/t156-2001 According to the standard requirements, the bevel and end face of the plastic-coated composite pipe after grooving shall be thoroughly cleaned, and the rust removal grade shall meet the specified requirements.
The overlap areas of the inner and outer coatings should be roughened with sandpaper to remove any flaking coating, dust, and oil contamination. The pipe ends and bevel surfaces should be coated with a layer at least as thick as... 0.5mm High-performance solvent-free epoxy resin coating. Before installation, it should be allowed to dry and cure naturally (recommended). 24 hours). The end face of the coated composite pipe that comes into contact with the rubber sealing ring on the outer wall shall be smooth and free of scratches and burrs that could impair the sealing performance of the rubber sealing ring.
The grooved connection of coated composite pipes shall be carried out according to the following procedure: Match the rubber sealing ring with the coated steel pipe, apply lubricant to the end of the pipe section, and then cover it. Reinstall another mating section and adjust the rubber sealing ring to the center of the connecting section. Place the clamp on the outside of the rubber seal, and insert the clamp’s edges into the groove. Insert the bolts into the bolt holes, and tighten the nuts alternately.
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