How to prevent the cracking of oil conveying rubber hose
How to prevent the cracking of oil conveying rubber hoseThe direct cause of damage to the oil conveying rubber pipe:
1) Environmental factors. Stainless steel plates are more sensitive to stress corrosion caused by chloride ion content. However, when the oil conveying rubber pipe works in a humid environment, the chloride ion content may cause stress corrosion failure due to the chloride ion content. The composition causes the plastic mesh bag stainless steel wire to cause many pitting corrosion pits and stress corrosion cracking. A lot of stainless steel wires cause cracking, and some stainless steel wires cause pitting corrosion pits and reduce the effective cross-section. The tensile strength of the remaining stainless steel wire cannot bear the air pressure of the oil conveying rubber tube and the load is broken, so that the metal wire mesh product causes a wide range of cracks, resulting in the lack of the internal oil conveying rubber tube. The maintenance and axial direction of the metal wire mesh product In the management of flexion and extension, the oil conveying rubber pipe suffered too little bending, and the lack of electric arc welding and electric welding of the oil conveying rubber pipe and the short connection caused the load to crack. The chloride ion content of the stainless steel wire comes from the humid gas containing many chloride ion content components. The chloride ion content component causes the stainless steel wire to cause many pitting corrosion pits and stress corrosion cracking.
2) Arc welding and electric welding welding factors, there are serious defects in arc welding and electric welding, which will further promote the cause and expansion of cracks. The outer surface of the oil conveying rubber pipe, a part of the cracked surface is scratched by the extrusion process, and there is a clear twin crystal loose spot area in the middle. The effective floor space of the wall thickness is reduced.
2. Preventive measures
1) In order to eliminate the difficulty of stress corrosion failure of the oil conveying rubber pipe, it is recommended to use the stainless steel sheet as the raw material of the metal wire mesh product, and the type and specification of the raw material of the oil conveying rubber pipe. The raw material contains Mo to resist ductile fracture and stress corrosion cracking. It is also slow; in addition, strictly control the quality of arc welding and electric welding of the oil conveying rubber pipe, and improve the effective maintenance of the oil conveying rubber pipe and the connecting arc welding and electric welding parts, which can effectively avoid damage during the entire installation process.
2) A regular inspection and management system for oil conveying rubber pipes should be established, and all steel wire hoses should be inspected. It is important to check the broken wires. If there are too few broken wires, pressure test or disassembly should be carried out according to the situation.
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