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Analyze the cause of the failure of the high pressure hose
Upload Time:
2022-09-15
Using a high pressure hose will help us a lot, but it will also create some problems. Let’s talk about the failure analysis of the high-pressure hose assembly first. 1. Symptoms: The hose is cracked inside and out, but the elastic material is still soft and elastic at room temperature. Cause: The likely cause is that the ambient temperature is extremely low when the hose is bent. Most standard hoses are rated at -40 degrees, some AQP hoses are -49 degrees, military hoses are -54 degrees, some thermoplastic hoses are -54 degrees, and teflon hoses are -73 degrees. 2. Symptoms: The inner tube of the hose is very hard and cracked. Reason: High temperature is easy to precipitate the plasticizer of the inner tube, which is a substance that can make the hose soft and plastic. Entrained oil will oxidize the inner tube. This oxidation reaction on the rubber product makes it hard. Oxygen and high temperature will greatly accelerate the hardening of the inner tube of the hose. Cavitation in the inner tube has the same effect. 3. Symptoms: The hose is broken, but there are no multiple wire breaks along the entire length of the hose. The hose may be broken in more than one place. Cause: This indicates that the pressure has exceeded the minimum burst strength of the hose. Stronger hoses are recommended, otherwise the hydraulic lines will fail, resulting in abnormally high pressure conditions. 4. Symptoms: The hose is broken, peel off the outer glue and check the steel wire reinforcement. Irregular wire breaks were found along the entire length of the hose. Cause: This indicates that the hose pressure fluctuates very frequently. SAE impact testing of double-layer steel wire braided hose requires 200,000 cycles at 133% of the recommended working pressure. The impact test of the SAE four-ply wound hose requires 500,000 cycles. If the number of extrapolated pulses of the system exceeds 1 million in a short period of time, it is best to choose a reinforced hose.
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