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Testing on above ground drainage
Testing on above ground drainage
Refer to approved document H for guidance on how to do this. Set the manometer to 39mm or (manufacturers instruction) and leave on for 3 minutes (see part H for full guidance).
When carrying out performance tests on appliances and waste pipes (AGD)
When carrying out performance tests on appliances and waste pipes (AGD)
Performance test
- Fill all the appliances on the system to their overflow levels.
- Release the water from all the appliances simultaneously.
- Flush the WCs at the same time
- Once all the appliances have finished discharging, check the trap seal depth in each appliance.
Checking trap seal depths after a performance test
Checking trap seal depths after a performance test
Check the trap seal depth:
- The trap seal depth after all the appliances have been discharged must be a minimum of 25mm deep in each trap
- The depth of each seal is checked by the use of a matt black dipstick. This is pushed down in between the waste grill, down to the bottom of the trap
Common faults
Common faults
The grill on a shower trap can be removed and cleaned.
The trap from under a bath can be removed, if necessary, although this is quite rare.
The trap under a sink should be removed periodically and any build up thoroughly cleaned.
Tools
Tools
Plunger- used to clear blockages from drains forcing air through the drain to force the blockage
Plunger- used to clear blockages from drains forcing air through the drain to force the blockage
Hand or drill augers are a useful tool to release a blockage in a waste pipe. These comprise of a rotating spring that spins in the pipe, breaking up any debris.
The trap may have to be removed first so the spring can be pushed down the waste pipe.
The symptoms of a blockage can be a slow discharge from an appliance or the back-filling of the waste pipe system.
The correct use of drain rods and attachments for underground blockages is important.
Safety - precautions
Safety - precautions
Whenever working on soil stacks or drains:
- Wear the correct PPE
- Inform the customer of any inconvenience
- Ask the customer not to use appliances
- Place warning notices on appliances – work in progress not in use
- Place warning notices around the working area
- If lifting a manhole cover, secure the area
- If working on the upper level of a soil stack, it is only appliances on or above the working level that need to be labeled
- Use the correct access equipment
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