What is a gully trap?
A gully trap is a basin in the ground that receives piped wastewater from your house before it enters the underground sewer (wastewater pipe). The basin has a water seal to prevent odours reaching the surface. Well-made gully traps prevent sewage flowing into your property or public pipes.
What is the minimum size of gully trap?
The total depth of gully trap shall not be less than 30 cm. And depth of water shall not be less than 15 cm and with a minimum water seal of 50 mm. Each gully trap shall have one cast iron grating 15 cm x 15 cm and it must be embedded in cement concrete foundation properly and housed in a brick masonry chamber.
What is the maximum distance between the top of the gully dish and the water seal?
A single-fixture discharge pipe must not be more than 3.5 m in length (G13) between the water seal of the fixture and the gully trap unless it is vented.
How do you block a gully?
In most cases, the gully will be blocked by twigs and leaves that have made their way through the trap. So clearing this debris by hand is often enough to get the gully running smoothly again. Once you’ve finished clearing the gully, give the taps in the kitchen a try to see if the water is draining smoothly.
Why do you need a gully trap?
Gully traps are needed to prevent the escape of dangerous gases that can form from waste and stagnant water, as well as to serve as a barrier to keep pests like rats and cockroaches from entering the pipe that leads into the home. A drainage gully can also work as an effective tool to remove rain and surface water.
What is the minimum depth of water seal required in gully trap?
5. What is the minimum depth of water required in gully trap? Explanation: Gully traps are deep seal traps, the depth of water seal should be 50 mm minimum. It prevents the entry of insects from sewer line to waste pipes carrying wastewater.
How deep are sewer lines NZ?
Trenches to be minimum depth (as below) and minimum width 200 wider than drain diameter, so normally 300mm. Compacted base material minimum 100mm deep, side compaction 100mm.
How do you unblock a gully trap?
Repair
- remove rubbish blocking the gully trap by pulling it out – avoid pushing it further down the drain. If necessary, rod the drain and try to pull the blockage up.
- if the drain remains blocked, call in a registered plumber or drainlayer.
Can soil pipe be above ground?
Soil and waste pipe is for gravity draining only, and is so tested to only 0.5 bar. Can above ground PVCu drainage pipe or fittings be installed underground? Above ground PVCu drainage pipe and fittings can only be used above ground.
Can you Rod a gully trap?
Unfortunately, due to the tight bend of its name-sake shape, a P-Trap gully can not be rodded because there is no way of getting the rod into the drain around the trap.
What is the difference between gully trap and P trap?
Gully trap prevents the entry of gas and insect from the main sewer line. P trap also prevents the entry of foul gases inside the toilet and bath.
What do Gully traps do in New Zealand?
Gully traps include a water seal to block odours from the sewer. Building Code requirements Installation of sanitary plumbing and drainage systems in New Zealand must be in accordance with New Zealand Building Code clause G13 Foul water.
Where are the gully traps in the sewer system?
GULLY TRAPS are part of the foulwater drainage system receiving discharge from kitchen, bathroom (apart from toilet pans) and laundry wastewater fixtures before the discharge enters the sewer system.
Can a deck be built over a gully trap?
Gully traps must be accessible for cleaning and maintenance. A deck may be built over a gully trap, but at least 600 mm of clear access space above the trap must be provided. This is for access to the gully trap and drainage inspection points.
What kind of fill do you need for a gully trap?
When installing a gully trap, it must be adequately supported by either: being set in compacted bedding material such as granular, non-cohesive fill that has a maximum particle size of 20 mm 75 mm thick concrete surrounding the entire gully dish and separated from the building foundation.