Product Overview: This dedicated mining pipe uses steel pipe as the base material, with both inner and outer walls coated with polyethylene (PE) or epoxy resin (EP) powder. It is designed primarily for scenarios such as underground coal mines, mine oil and gas transportation, and mine drainage. Some products are marked in black to adapt to the complex and harsh working conditions in mines. It features dual functions of medium transportation and protection, with pressure-bearing, corrosion-resistant, and impact-resistant performance far superior to ordinary pipes.
Production Process
Item | Parameters |
Base Pipe Selection & Inspection | High-strength carbon steel pipes meeting mine safety standards are selected. Strict inspections are conducted on wall thickness, pressure-bearing capacity, impact resistance, and weld quality to ensure the base pipe can adapt to harsh mine conditions. |
Surface Pretreatment | High-strength shot blasting process is adopted to thoroughly remove rust, oil, oxides, and impurities from the inner and outer walls of the steel pipe, forming a uniform rough surface to enhance the bonding strength between the base pipe and the composite coating. |
Primer Application | A special anti-static, flame-retardant bonding primer is applied to the pretreated steel pipe surface and cured at a constant temperature to form a transition layer, improving the adhesion, anti-static, and flame-retardant properties of subsequent coatings. |
Composite Coating Application | Using electrostatic spraying technology, a special composite coating integrating anti-static, flame-retardant, and wear-resistant properties is evenly applied to the inner and outer walls of the pipe. This ensures uniform coating thickness with no missed areas or bubbles, resulting in excellent wear resistance. |
Curing & Forming | The coated steel pipe is sent to a constant-temperature curing oven for heating and curing. The curing temperature and time are strictly controlled to form a dense, firm protective layer with anti-static, flame-retardant, and wear-resistant properties, which is tightly bonded to the base pipe. |
Quality Testing | Comprehensive and strict testing is carried out, including anti-static testing, flame-retardant testing, wear resistance testing, coating thickness inspection, adhesion testing, hydrostatic testing, and anti-corrosion performance testing. All tests meet the specified standards. |
Post-Processing & Packaging | Qualified pipes are cut to the required specifications, with threads or flanges processed. The surface is treated for anti-corrosion and anti-collision before packaging, ensuring the pipes remain intact during transportation and meet on-site installation and mine safety requirements. |
Standards Compliance
中文 | English |
《煤矿用涂塑复合钢管》MT/T 1071-2008 | Plastic-Coated Composite Steel Pipes for Coal Mine MT/T 1071-2008 |
《煤矿井下用塑料管安全性能检验规范》MT 181-1988 | Safety Performance Inspection Specification for Plastic Pipes Used in Coal Mine Underground MT 181-1988 |
《煤矿安全规程》(2022 年修订版) | Coal Mine Safety Regulations (2022 Amended Version) |
《流体输送用钢塑复合管及管件》GB/T 28897-2021 | Steel-Plastic Composite Pipes and Fittings for Fluid Transportation GB/T 28897-2021 |
《给水涂塑复合钢管》CJ/T 120-2016 | Plastic-Coated Composite Steel Pipes for Water Supply CJ/T 120-2016 |
Main Applications:
· Water Supply & Drainage Systems Nominal Diameter: DN100–DN800 Base Pipe Wall Thickness: 4.0mm–6.0mm Key Feature: Corrosion resistance Working Pressure: 1.0–2.5MPa
· Ventilation Systems Nominal Diameter: DN300–DN1600 Base Pipe Wall Thickness: 3.5mm–5.0mm Key Feature: Anti-static Working Pressure: ≤1.6MPa
· Gas Drainage Systems Nominal Diameter: DN150–DN600 (DN200 is commonly used) Base Pipe Wall Thickness: ≥5.0mm–8.0mm Key Features: Anti-static, flame-retardant Working Pressure: High pressure resistance
· Shotcrete Systems Nominal Diameter: DN50–DN150 Base Pipe Wall Thickness: 6.0mm–10.0mm Key Feature: Wear resistance Working Pressure: ≥10MPa
