How to check the pressure of the plumbing
When plumbing is installed in a new construction or during a remodeling, local building codes may require an inspector to perform pressure control. To avoid having to pay high fees or fail the inspection, you can check the pressure of your pipeline prior to the inspector’s visit. Even if your pipeline is not to be checked, you can check the pressure to verify the quality of your facilities, and identify and solve any problem before it becomes serious.
- Prepare the system. It is preferable that you check the water supply and the drainage system (drainage, waste and ventilation) when all pipes are installed, but before they are covered or inaccessible. The pipes must be dry and the main key closed.
- Blocks the drainage system. For a pressure measurement, you will need a system without air leaks. It locks the ventilation pipes and empties the T-joints near the main pipe. Seal all openings, such as drains and water intakes. You can do this using adhesive plugs or inflatable plugs.
- Connect the pressure pump and the meter. Following the manufacturer’s instructions, connect the pressure pump and the meter to an appropriate part of your drainage system, such as a washing machine.
- Put pressure on the plumbing system. Operate the air pump until the meter registers five pounds (2.27 kg) per square inch (PSI).
- Monitor the pressure. Control the pressure gauge constantly, at least for 15 minutes. If the pressure remains constant at five PSI, your drainage system is safe and has passed the test. On the other hand, if the test fails you must surely have a loss somewhere.
- Check if there are losses. Even if the pressure remains constant during the test, you can inspect your drainage system for any signs of small leaks, such as a soft hiss or an air leak. If the pressure fails during the test, or if you suspect for any other reason that there is a leak, you can also check the joints by applying a small amount of soapy water and watching for bubbles due to an air leak.
- Repair the losses. Once you have identified the source of a loss, you can solve the problem by reinstalling or replacing the loose, defective joints or damaged parts of the pipes. Then you can perform the pressure test again to verify that the problem has been resolved or discover what repair should be done.
- Test the water supply lines. Generally, you can perform a pressure test on the supply lines by simply opening the water outlet and controlling the entire length of the system to detect any leaks that the water pressure reveals. However, if you prefer an air pressure test, you can follow the same steps as with the drainage system.
- You can buy the necessary equipment and tools in a hardware store or plumbing shop, you can also rent the equipment for less cost in a rental business.