Making sure Pressure Testing is of the Highest Standard
What is the purpose of Test Plugs?
Testing plugs are used to stop pipes and to carry out low pressure testing on many types of pipes, and often this testing is mandatory. In order to meet building regulations any new construction, whether residential or commercial, may require a drain pressure test.
What types of Test Plugs are available?
Bailey Test Plugs are available in two forms, centre lock and rim fastening. Centre locks can be produced in steel/aluminium or nylon to suit the application (rim fasts are only available in steel).
How do you use Test Plugs?
Air Test – Testing Guidelines
- Seal pipe section with appropriate size drain test plug. Remove any grease or foreign material from installation point. Ensure no dirt is trapped between seal of plug and plates. Ensure plug is inserted square to pipe wall. Ensure wing nut and sealing cap is tight.
- Fit test nipple to one of the drain test plugs.
- Connect rubber hose via ‘Y’ piece to nipple, ‘U’ gauge and hand bellows.
- Fill ‘U’ gauge with water to ‘zero’.
- Squeeze the hand bellows gently until the level reaches 100mm on the open side of the gauge and the lower limit below zero on the closed side. The level should not fall to less than 75mm during period of 5 minutes without further pumping, after allowing a suitable time for stabilization of air temperature. If it drops below 75mm within the specified time the pipe section is leaking.
Water Test – Testing Guidelines
- Fit an expanding plug, suitably braced to resist the full hydrostatic head, at the lower end of the pipeline. Also plug any branches. The pipes may need strutting to prevent movement.
- Provide a means of applying the test head of water at the top end of the line, preferably using a 90 degree bend and a straight pipe of the same diameter as the line. Ensure that the standpipe and plug are suitably strutted to resist the applied hydrostatic head. Provide a means of filling the pipeline with water.
- Fill the system with water keeping pockets of trapped air to a minimum.
- Fill the standpipe to the requisite level.
- Leave for at least two hours to enable the pipes to become saturated, topping up as necessary.
- After the absorption period measure the loss of water from the system by noting the amount needed to maintain the level in the standpipe over a further period of 30 minutes. In carrying out the test to the requirements (please see current Building Regulations), the standpipe should be topped up at regular intervals of 5 minutes and the amounts measured. Seal pipe section with appropriate size drain test plug.
What Other Testing Equipment is Available?
A range of testing equipment is available which includes: