1. First, collect the basic parameters of the working conditions (a prerequisite for manufacturer's selection):
Hengshui Hengbo Pipe Industry - Mine Piping
Main products: Steel wire mesh reinforced pipe, steel wire braided composite pipe
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Filler slurry parameters: medium type (full tailings / crushed stones / gypsum bodies), particle size, hardness, slurry concentration, flow rate, hard particles, containing coarse aggregates, wear will significantly intensify.
Pipeline system parameters: filling ratio line, vertical drop, total transportation length, calculate the maximum working pressure of the system, the recommended rated pressure of the pipe material should reserve a safety margin of 1.5 times the maximum working pressure.
Environmental conditions: underground / surface, acid-base corrosive environment, environmental temperature; for underground coal mine scenarios, the pipe material needs to have flame retardant, anti-static, and dual anti-performance; the corresponding safety standard certificate is required.
Pipeline section classification: horizontal long-distance main pipe, vertical drilling section, elbows / three-way valves / variable diameters and other easily eroded pipe fittings, the wear at different positions varies greatly, it is not recommended to use the same pipe material throughout the line.
II. Recommended pipe material types (manufacturer matches according to working conditions):
PF wear-resistant composite pipe: light weight, corrosion-resistant, good dual anti-performance, suitable for full tailings paste, low-pressure horizontal long-distance pipelines; fine particles, weak corrosive working conditions have the best cost performance; coarse aggregates, high pressure, strong impact scenarios should be used with caution.
Ordinary wear-resistant steel pipe: moderate price, high pressure-bearing capacity, convenient maintenance, suitable for medium wear, medium-high pressure filling pipelines; weak anti-corrosion ability, rusts quickly in underground humid environments.
Double-metal overlay wear-resistant pipe: high chromium alloy layer on the inner wall, wear-resistant and impact-resistant, suitable for vertical sections, paste bodies containing crushed stones and coarse aggregates, high pressure-bearing capacity, the price is higher than ordinary steel pipes.
Ceramic inner lining composite pipe: the wear resistance is the strongest, suitable for elbows, variable diameters and other local strong erosion points; the impact resistance is weak, cannot withstand the impact of large aggregates, the pipe fitting price is high.
III. Matching principles of wear resistance level and pressure resistance:
Wear resistance level and pressure resistance level are selected separately, and only a single indicator cannot be considered. For low-pressure long-distance horizontal sections, the wear resistance level is prioritized to control the procurement cost; for vertical sections and pipe fitting positions, the wear resistance level is increased; for high-pressure working conditions, the pipe material's pressure resistance safety is prioritized first, and then the wear layer is matched.
At the same time, the manufacturer is required to provide a wear test report, and the wear resistance level cannot be only verbally marked; under the same wear resistance level, the thickness of the wear layer and the modification formula directly determine the actual service life.