The capacity you need, in the dimensions your site allows
Each tank is built on one of seven standard diameters at whatever length the capacity requires, so off-catalogue sizes are routine. A dimensioned drawing comes with the quotation.
- 7 diameters, any length
- Drawing with the quotation
- Custom nozzles and partitions
- 25-year warranty
We reply within one working hour, Saturday to Thursday.
Seven diameters, any length
Every cylindrical tank we make is built on one of seven diameters: 1.20, 1.50, 1.80, 2.00, 2.40, 3.00 and 3.50 m. The length is then set by the required capacity.
That is why there is no fixed size list. Past examples include 6,500 litres at 1.20 m diameter for a narrow plot, 4,800 litres and 2,800 litres.
| Diameter | Horizontal capacities in our tables | Approx. length |
|---|---|---|
| 1.20 m | 3,000 – 5,000 L | 2.6 – 4.5 m |
| 1.50 m | 5,000 – 12,000 L | 2.9 – 6.7 m |
| 1.80 m | 8,000 – 18,000 L | 3.0 – 7.2 m |
| 2.00 m | 10,000 – 25,000 L | 3.3 – 8.0 m |
| 2.40 m | 15,000 – 30,000 L | 3.4 – 6.5 m |
| 3.00 m | 30,000 – 60,000 L | 4.5 – 8.8 m |
| 3.50 m | 50,000 – 100,000 L | 4.3 – 10.5 m |
What can be customised
- Capacity, to the litre you specify.
- Diameter and length, to suit plot width, pit length or available height.
- Number and position of inspection manholes.
- Size and position of inlets, outlets and vents.
- Internal partitions for two or more compartments.
- Orientation: buried horizontal, above-ground horizontal on GRP saddles, or vertical.
A drawing from our draughtsman with the quotation
For a non-standard tank, the factory draughtsman prepares a drawing with dimensions and nozzle positions, attached to the quotation. You or your engineer review it, and we revise it before production starts.
If you already have a consultant's drawing or a dimensioned sketch, send it and we price against it.
What to send us
Custom sizes take about a week depending on the order and carry the same warranty: 25 years from the invoice date against manufacturing defects.
- Capacity in litres.
- The maximum length, diameter or height the site allows.
- The stored liquid: water, wastewater, or another liquid, in which case we ask for details to select the resin.
- Buried or above ground.
- A sketch or site photo, if available.
Frequently asked questions
My capacity is not in your size table. Can you make it?
Yes. Capacity is set by length, so any capacity can be built on the diameter that suits the site.
My plot is narrow. What are the options?
A longer tank on a smaller diameter. At 1.20 m diameter we have built 6,500 litres, which suits side passages and narrow plots.
Can the tank be split into two compartments?
Yes. Internal partitions are made to order and shown on the drawing attached to the quotation.
Do you make non-cylindrical tanks?
Most of what we build is cylindrical. Send the dimensions you need and we will review the request and reply.
How long does a custom tank take?
About a week depending on the order; the quotation confirms the lead time.
Related pages
Custom GRP tanks
Any capacity on a diameter that fits your site, with nozzles and partitions where you need them.
Sizes and dimensions
Diameters, lengths and heights for horizontal and vertical tanks.
Technical submittals
Data sheet, drawings and warranty with the quotation, on request.
Large-capacity tanks
20,000 litres and up for buildings and projects, with drawings, delivery and placement.
Ready for your quote?
Send the type, capacity and city, and we reply within an hour.