How to prevent production downtime by troubleshooting pipeline damage?

In hydraulic equipment such as pipe bending machines and pressurization machines, pipeline (oil pipes, air pipes) damage is one of the common causes of sudden shutdowns. A small leak, if not detected in time, can escalate into a sudden drop in system pressure, malfunction, or even a large amount of hydraulic oil splashing, leading to a safety accident. Establishing a systematic pipeline inspection mechanism is key to avoiding unplanned downtime.

Typical Warning Signs of Pipeline Damage

Before an actual leak occurs, equipment typically issues warning signals:

Pressure fluctuations: Frequent fluctuations in the hydraulic gauge pointer, or difficulty in reaching the set pressure.

Abnormal noises: Hissing or sucking sounds from the hydraulic pump, or whistling sounds from the pipeline.

Abnormal oil temperature rise: Leakage causes a decrease in system volumetric efficiency, leading to a rapid increase in oil temperature.

Slow oil level drop: The oil level in the tank continues to drop without external leakage (internal leakage).

Changes in pipe appearance: Bulging, cracks, hardening, or corrosion of the braided layer appear on the hose surface.

Four-Step Method for Pipeline Inspection

Step 1: Static Visual Inspection

With the equipment stopped, inspect all hoses, rigid pipes, and joints for oil stains or droplets.

Pay special attention to pipe sections with small bending radii and those in contact with moving parts.

Check hose labels to confirm if they have exceeded their recommended service life (usually 2-5 years).

Step 2: Dynamic Pressure Leak Detection

Start the equipment, run it under no-load, and gradually increase the pressure to the working pressure.

Spray a leak detector (soapy water) onto joints, both ends of hoses, and suspected leak points, observing for bubbles.

For minor leaks, a UV leak detector lamp can be used in conjunction with a fluorescent tracer.

Step 3: Pressure Drop Measurement Test

Close the equipment outlet and perform a pressure test on the system: After pressurizing to the rated pressure, close the shut-off valve and observe whether the pressure gauge reading drops beyond the allowable range within a specified time (e.g., 5 minutes).

If the pressure drops rapidly without external leakage, there is internal leakage (e.g., leakage in the cylinder seal or valve body).

Step 4: Preventive Replacement Decision

In the following situations, the pipe should be replaced directly rather than repaired: the outer layer crack of the hose exceeds the braided layer, the steel wire at the joint is broken, or the wall of the rigid pipe is significantly thinned or pitted.

For high-pressure hoses, a two-dimensional replacement strategy of "time + condition" is recommended: even if the appearance is good, it should be included in the replacement plan if it has been used for more than 5 years.

Key Measures to Prevent Downtime

Establish an Inspection System: Perform a quick inspection before starting the machine each day, following the steps of "look (for oil stains), listen (for unusual noises), and touch (for temperature)."

Mark High-Risk Pipe Sections: Use color-coded labels to mark pipes with small bending radii, those near heat sources, or moving parts to prioritize their inspection.

Stock Up on Critical Spare Parts: Maintain a minimum inventory of commonly used high-pressure hoses, fittings, and O-rings to avoid prolonged downtime due to waiting for parts.

Record Replacement History: Establish a pipe replacement log, recording installation date, working pressure, and usage time to facilitate lifespan prediction.

Standardize Installation Standards: When replacing pipes, adhere to the correct bending radius (for hoses, not less than 6-8 times the outer diameter), avoid twisting, and use double wrenches to tighten fittings.

Although small, pipes are the "blood vessels" of a hydraulic system. Proactive inspection and timely replacement, transforming "reactive maintenance" into "preventive maintenance," are essential to fundamentally avoid production interruptions caused by pipe damage.