The full installation guide: our part, and your contractor's
We build, deliver and, on request, crane-place the tank. Excavation, base and backfill are your contractor's, and we give them a written guide with every condition that keeps the tank sound and the warranty valid.
- Guide sent with the quotation
- Clear responsibility split
- Burial conditions in numbers
- 25-year warranty
We reply within one working hour, Saturday to Thursday.
Who does what
| Task | Responsibility |
|---|---|
| Manufacture to the required capacity and diameter | Laura |
| Installation guide with the quotation | Laura |
| Delivery to site | Laura, or collection by you |
| Crane placement | Laura on request, paid service |
| Excavation and block walls | You or your contractor |
| Blinding concrete and sand bed | You or your contractor |
| Backfill and filling the tank with water | You or your contractor |
| Reinforced concrete roof slab | You or your contractor |
| Connecting inlets, outlets and pump | You or your plumber |
Burial conditions from the guide
The underground installation guide walks through each step.
- Block-walled pit no more than 60 cm longer than the tank.
- At least 10 cm of blinding concrete on the pit floor.
- A 10 cm bed of clean sand under the tank.
- Tank set level on the sand.
- Part-backfill the sides with clean sand, fill the tank with water, then complete the backfill with clean sand.
- No more than 20 cm of backfill over the tank.
- A reinforced concrete slab at least 10 cm above the tank, carrying the loads instead of the tank.
Above-ground tanks and septic tanks
Roof and vertical tanks need a level, even base, and nothing should be stored on top of the tank.
For septic tanks, the Saudi Private Sewage Code calls for a 75 mm compacted bed of sand and gravel, and the municipal code official issues the permit and inspects the installation.
Why these conditions matter for the warranty
The warranty runs 25 years from the invoice date against manufacturing defects and depends on the installation guide. It does not cover breakage from rocky backfill, a broken roof slab, or installation that ignores the conditions.
Hand the guide to your contractor before excavation starts, and keep photos of the pit before placement.
Frequently asked questions
Do you dig the pit and pour the base?
No. Excavation, base, slab and backfill belong to the site owner or contractor, and we give them a written guide with every dimension.
Why is backfill over the tank limited to 20 cm?
Extra soil loads the tank shell. The reinforced slab is what carries loads above, not the tank.
Why fill the tank with water during backfill?
The guide sets the order: part-backfill the sides, fill the tank with water, then complete the backfill. The water holds the tank in place and balances the backfill pressure around it.
Can the tank go into an old tank's pit?
Yes. Send the internal length, width and depth of the pit and we choose a diameter and length to fit.
What size are the inlets and outlets?
The standard buried tank comes with 2-inch and 1-inch inlets and outlets plus vents; other sizes on request.
Related pages
Ready for your quote?
Send the type, capacity and city, and we reply within an hour.