1. Storage and Handling Stage
1. PVC U pipes and fittings should be stored in a cool, ventilated area away from direct sunlight. UV rays accelerate aging and embrittlement. If stored outdoors, cover them with a light blocking tarp.
2. Do not stack too high to prevent deformation of the lower layers from compression. Sort and stack by type. Do not place heavy items directly on top of fittings.
3. Avoid throwing or dropping during handling. Violent impacts can cause hidden cracks, especially in low temperature conditions where PVC toughness decreases. These cracks are hard to spot visually but may cause leaks later.
4. Keep away from high temperature sources such as boilers and heating pipes. Do not store together with organic solvents or chemicals, as solvents can corrode the fitting surface.
2. Installation and Construction Stage: Reduce Future Failures at the Source
1. Cut pipe ends squarely and remove burrs and debris. Debris left inside the pipe can cause blockages later.
2. Use only dedicated PVC solvent cement for drainage bonding. Clean the bonding surfaces of pipes and fittings thoroughly to remove dust, moisture, and grease. Apply cement evenly, insert fully, and allow sufficient curing time. Do not run water or move the pipe during curing.
3. Install expansion joints, supports, and hangers according to specifications. PVC expands and contracts with temperature changes. Lack of expansion joints can cause joint cracking. Improper support spacing can lead to sagging and deformation.
4. Ensure proper slope for drainage pipes. Gravity drainage relies on slope. Insufficient slope causes water pooling and sediment buildup, reducing pipe service life.
5. Avoid forcing pipes into alignment during installation. Do not strike fittings violently to seat them. This creates internal stress that may lead to cracking over time.
3. Daily Operation Precautions
1. PVC U drainage pipes are designed for gravity non pressure systems. Do not discharge high temperature wastewater. Short term discharge temperature should not exceed 60°C. For continuous use, it is recommended to keep the temperature below 50°C.
2. Do not pour grease, cement mortar, hair, or other debris into drains. Grease solidifies when cooled, and solid debris accumulates, causing blockages. Blockages increase internal pressure and can damage fittings.
3. Keep cleanouts and inspection ports accessible. Open them periodically for pipe cleaning. Do not seal access points with cement.
4. Avoid heavy loads above buried PVC pipes. Do not stack heavy items or build structures on the ground above, as soil compression can crack the pipes.
4. Regular Inspection and Maintenance Tips
1. Periodically check glued joints for signs of water seepage or damp stains. Detect and address minor leaks early.
2. Inspect pipe supports and hangers for looseness or detachment. Check for sagging or deformation of pipes.
3. For exposed outdoor PVC pipelines, regularly inspect the surface. If whitening, cracks, or embrittlement appear, apply protective treatment promptly. Use dedicated PVC UV protective coating.
4. When clearing blockages, prioritize using a soft spring drain snake. Avoid sharp rigid tools forced through the pipe, as they can scratch the inner wall or puncture fittings.
5. Troubleshooting and Aging Replacement Tips
1. If a local fitting cracks and leaks, replace the damaged fitting directly. Do not simply patch it with adhesive. Adhesive repairs are only temporary and cannot withstand long term pressure.
2. If old pipes show widespread embrittlement and multiple cracks, the material has aged. It is recommended to replace the entire section to avoid repeated repairs.
3. Do not modify drainage pipelines arbitrarily. Unauthorized changes alter hydraulic conditions and can cause backflow or blockages.
6. Key Points to Extend PVC Pipe Life
• Protection from UV, high temperature, and physical impact is essential.
• Proper construction practices are the most important factor in reducing future failures.
• Avoiding excessive temperature and debris discharge, combined with regular inspections, will help PVC pipes reach their designed service life.
