Carrying out a proper drain test is crucial to ensure that your plumbing system is leak-free and meets the required standards. Two of the most commonly used methods are air testing and water testing. While air testing is quick and effective, water testing allows you to inspect larger sections of the system at once. There are other methods like smoke testing and mandrel testing, which can help identify specific issues that might not show up in the initial tests.
Before you begin any testing, it's important to examine the entire pipeline for any visible damage or leaks. If you're dealing with jointed systems, it's advisable to let them sit for a couple of days to drain fully so you can address any potential problems upfront. It's also recommended to have a building control officer present during the test to ensure compliance with local regulations.
Smoke testing can be particularly useful for identifying leaks in uPVC pipes. However, it's essential to check with the manufacturer first since certain types of pipes may be damaged by this method. Mandrel testing involves sending a cylindrical object through the pipe to check for consistent diameter, ensuring the pipe's integrity.
For air testing, start by securing a bung at the beginning of the pipe run and attaching it to a manometer. Inflate the system to a pressure between 125-150mm, then reduce it to 100mm after 10 minutes. Monitor the pressure for five minutes; if it drops below 75mm, investigate for leaks. If everything checks out, proceed with a water test.
Water testing, also known as water drop testing, involves filling the system with water and checking the levels at access points. The water should not exceed 1.5 meters from the lowest point of the drain. Follow specific guidelines based on the pipe diameter, either BS8301 or BS8005, to determine the appropriate water head.
In some cases, repairs might be necessary after testing. Faulty sections may need replacing or resealing. Manhole covers and inspection chambers often require rejoining and resealing if there are leaks. If the problem persists, rebuilding the structure may be unavoidable, though this is generally a last resort.
For manholes and inspection chambers, the water test process remains similar. Plug all open ends and fill the chamber with 300mm of water. Monitor the water level for an hour, ensuring there's no excessive loss. Acceptable leakage rates depend on the pipe diameter, with smaller pipes allowing less water loss.
A typical drain testing kit includes essential tools like air tubing, a manometer, Y-pieces, bungs, and a hand bellows. These kits are designed to cover various testing scenarios and ensure your plumbing system is robust and functional. Always double-check your results after any repairs to confirm the system is functioning correctly.
If you're unsure about any aspect of the testing process, don't hesitate to reach out for professional advice. Proper testing not only ensures compliance but also guarantees peace of mind knowing your plumbing system is reliable and safe.
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