The production of acidizing fracturing hoses, designed for high-pressure and highly corrosive fracking environments, involves a stringent manufacturing process based on a "from the inside out" layering principle. The core steps are as follows:
1. Material Preparation & Inner Layer Extrusion
Material Preparation: Raw materials are weighed precisely according to formulations. The inner tube compound is typically a specialized synthetic rubber (e.g., HNBR or FKM) offering exceptional resistance to acids and oils.
Inner Layer Extrusion: The compound is fed into an extruder, where it is heated and forced through a die to form a seamless, hollow tube. This creates the primary barrier against leakage and corrosion.
2. Reinforcement Layer Braiding/Winding
This is the core step determining the hose's pressure-bearing capacity. High-tensile steel wires are applied over the inner tube using precision braiding or winding machines.
Braiding: Provides good flexibility, often used for medium-to-high pressure hoses.
Winding: Withstands ultra-high pressures, making it the preferred choice for acidizing fracturing hoses. Multiple layers (e.g., 4 or 6) of steel wires are cross-wound to create an extremely robust "metal skeleton."
3. Outer Layer Extrusion & Covering
An abrasion, weather, and ozone-resistant cover (often made from Chloroprene Rubber CR or other specialty polymers) is extruded over the reinforcement layer. This layer protects the internal steel wires from physical damage, friction, and environmental factors.
4. Vulcanization (Curing)
The hose assembly is placed into an autoclave (a large pressure vessel).
Under specific temperature, pressure, and time conditions, the rubber undergoes vulcanization. This process cross-links the polymer chains, giving the hose its final shape, strength, elasticity, and durability.
5. End Fitting Attachment & Pressure Testing
Steel end fittings are crimped onto the hose. Every hose is rigorously pressure-tested to ensure safety and no leaks.
6. Packaging & Storage
Approved hoses are cleaned, marked, and packaged (coiled or straight) according to specifications before final storage and shipment.