A commercial kitchen tenancy in Molendinar needed a new grease trap and wastewater drainage for its fit-out. The tank had to go beneath existing concrete, where other services were already buried. Before cutting into the slab, the crew needed to find those services and plan the work.
Citi Industries completed the installation in April 2022. The job covered a 1,500-litre grease trap, trade waste and sewer drainage, in-ground vents and one bucket trap.
Project Overview
The trap needed Class D lids rated for vehicle traffic.
Pipework ran across two parts of the tenancy. A new trade waste line needed to reach the kitchen fixtures inside, while the below-ground system required sewer drainage. The drawings also called for vents serving the tank and trade waste line.
Work on the underground services meant opening the existing concrete. The project included scanning, cutting, removal and replacement of the affected sections.
Challenges
Finding Services Before Cutting
Buried services were a concern wherever the crew needed to open the slab. Cutting into an existing pipe could have damaged the plumbing already in place. Scanning first helped workers locate those services and plan the cutting area.
Pedestrian movement was another site consideration. Barricades were needed during the concrete and below-ground work to keep people clear of the affected area.
The installation also required room for the new tank and several pipe runs. All of this had to fit around the services already below the slab.
Reaching the Commercial Kitchen
The trade waste line had to enter the tenancy and connect to the planned kitchen fixtures. Workers needed to follow the drawings so wastewater reached the grease trap before moving downstream.
Separate sewer drainage and in-ground vents also needed space beneath the floor. Our crew had to allow for those runs alongside the trade waste pipework.
The drainage work was planned around Gold Coast trade waste requirements and Queensland’s Plumbing and Drainage Act 2018.
Solutions
Scanned and Opened the Work Area
Workers scanned the concrete, cut the affected sections and removed them for the installation. They also barricaded the work area for pedestrian safety.
Installed the 1,500-Litre Grease Trap
For the grease trap installation, our team fitted a 1,500-litre below-ground tank with the specified Class D lids.
The trap was designed to intercept fats and oils before wastewater reached downstream drainage.
Class D lids are heavy-duty covers rated for vehicle traffic. They also provide access for inspection and grease removal without breaking up the surrounding concrete.
Laid Trade Waste and Sewer Drainage
The crew installed the new trade waste and sewer pipes, including the line running into the tenancy. Each followed the route shown on the project drawings.
Trade waste pipework carried kitchen wastewater to the grease trap. Sewer drainage was installed as a separate part of the system.
Ran In-Ground Vents
Workers installed in-ground vents for the grease trap and new trade waste line. Unlike the drainage pipes, vents moved air through the system instead of wastewater.
The vents helped balance pressure as wastewater flowed. AS/NZS 3500 plumbing and drainage standards provided technical guidance for this part of the work.
Fitted One Kitchen Bucket Trap
One bucket trap was fitted inside the commercial kitchen. This collected wash water and debris at a local drainage point.
Replaced the Concrete
After installing the underground tank and pipes, workers replaced the concrete disturbed by the job.
Final Outcome
By April 2022, the Molendinar tenancy had a 1,500-litre below-ground grease trap in place. Our crew had also installed the trade waste and sewer drainage, in-ground vents and one bucket trap. Workers reinstated the affected concrete.
Final Thoughts
A grease trap needs the right capacity, drainage connections and access for maintenance. Existing concrete and buried services can also affect installation work.
For grease trap installation or commercial plumbing services in Molendinar, contact the Citi Industries team. The team can assess the site, discuss drainage requirements and plan the work. Call 1300 002 484 to discuss your project.
1300 002 484
