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How to Clean a Clogged Concrete Conveying Pipeline in a Wet Spray Machine
Release time:
2025-12-13
Source:
Author:
Summary:
I. Blockage Prediction and Localization
1. Early signs: Pumping pressure consistently exceeds 12 MPa (normal range: 8–10 MPa); obvious pulsation in the discharge flow (amplitude > 5%); abnormal pipe body temperature (temperature difference from ambient exceeds 20℃).
2. Locating the blockage segment: Percussion auscultation method (the solid sound segment indicates the location of the blockage); infrared thermal imaging (the low-temperature segment indicates the coagulation zone).
II. Low-Pressure Backflush Cleaning Method (for Mild Clogging)
1. Operating procedure: Switch the pumping direction (reverse pump 3–5 times); inject a cleaning agent (5% oxalic acid solution) and let it soak for 30 minutes; then flush in sections using a low-pressure water gun (0.3 MPa).
2. Applicable conditions: Blockage length < 3 meters; setting time < 2 hours.
III. High-Pressure Unclogging Solution (Severe Blockage)
1. Mechanical unclogging: Use a flexible pipe cleaner (diameter < 80% of the pipe’s diameter); combine with pneumatic hammer vibration (frequency 20 Hz).
2. Blasting Cleanup: Install a pipeline bursting valve (instantaneous pressure: 15 MPa); direct oxy-acetylene heating is strictly prohibited (as it poses a risk of pipe rupture).
IV. Chemical Dissolution Method
| Blockage Type | Solvent Formulation | Treatment Time |
| Initial setting of cement | 5% citric acid solution | 2-4 h |
| Final Setting and Hardening | 10% Hydrochloric Acid + Corrosion Inhibitor | 6-8 hours |
| Steel fiber agglomeration | Complexing agent | 12h |
Note: After pickling, neutralize with 5% sodium carbonate.
V. Disassembly and Cleaning of Pipelines
1. Disassembly guidelines: Mark components in pipe number order (photographing is recommended for record-keeping); use specialized pipe wrenches only (flame cutting is prohibited).
2. Cleaning tools: rotary wire brush (rotational speed ≤ 500 rpm); high-pressure water jet (pressure ≥ 50 MPa).
VI. Preventive Measures
1. Construction Control: Maintain the slump within the range of 160–180 mm; if pumping is stopped for more than 30 minutes, perform two back-pumping operations.
2. Pipeline Maintenance: Rinse with clean water for 15 minutes per shift; inspect pipe wall thickness weekly (replace if wear exceeds 20%).
7. Safety Warning
1. High-voltage hazard: During unclogging, keep personnel at least 3 meters away from the pipe opening; wear splash-proof protective gear (a full-face mask is required when the pH is greater than 9 or less than 5).
2. Environmental requirements: Wastewater must be collected and treated (pH adjusted to 6–8 before discharge).
8. Economic Comparison
| Cleaning Method | Time Required | Cost | Risk of Pipe Damage |
| Recoil Method | 1h | ¥50 | None |
| Chemical Dissolution | 6h | ¥300 | 5% |
| Mechanical Disassembly | 4h | ¥800 | 15% |
Best practice: For mild blockages, prioritize the backflush method.
RELATED INFORMATION
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