FRP vessel size chart — 0844 to 3072 with capacities
Short answer: The four digit vessel code is simply the diameter and height in inches. A 1054 is 10 inches in diameter and 54 inches tall; a 1665 is 16 by 65 inches. Vessel size is selected from the volume of media you need to hold, with the media occupying no more than about 60 percent of the vessel.
Reading the code
Every FRP vessel carries a four digit number:
- The first two digits are the diameter in inches
- The last two digits are the height in inches
So a 1354 is 13 inches across and 54 inches tall, and a 2472 is 24 by 72 inches.
Size chart with resin capacity
| Vessel | Size (inches) | Max resin (litres) | Typical service flow |
|---|---|---|---|
| 0844 | 8 × 44 | 22 L | ~500 LPH |
| 1054 | 10 × 54 | 42 L | ~900 LPH |
| 1354 | 13 × 54 | 70 L | ~1,500 LPH |
| 1465 | 14 × 65 | 98 L | ~1,800 LPH |
| 1665 | 16 × 65 | 128 L | ~2,400 LPH |
| 1865 | 18 × 65 | 163 L | ~3,000 LPH |
| 2160 | 21 × 60 | 204 L | ~4,000 LPH |
| 2469 | 24 × 69 | 307 L | ~5,500 LPH |
| 3072 | 30 × 72 | 500 L | ~8,500 LPH |
Working out the resin volume for a softener
Two figures decide it — the hardness of your water and how much water you treat between regenerations.
Example: 350 ppm hardness, 1,000 litres a day, regenerating every 15 days:
(350 × 1,000 × 15) ÷ 55,000 = 95 litres of resin → so a 1465 vessel.
Our free plant calculators will do this for you.
Why media should not exceed 60 percent
Media must never fill the vessel. Space is needed above it — called freeboard — because during backwash the media bed expands and lifts.
- Without freeboard the media has nowhere to expand, so backwash does not clean it
- Media can be carried out through the top distributor and lost
- The bed becomes compacted and channels form
The full explanation is in our freeboard guide.
Which vessel for what duty
| Vessel | Common use |
|---|---|
| 0844, 1054 | Domestic softener, small filter |
| 1354, 1465 | Shop, small commercial softener |
| 1665, 1865 | Commercial softener, multigrade filter |
| 2160, 2469 | Industrial softener and filters |
| 3072 and above | Large industrial plants |
Choosing by flow, not only by media
Media volume is one constraint; flow is the other. Water passing too fast through the bed is not properly treated.
The usual guide is a service flow of 20 to 25 litres per minute per square foot of bed area. In practice this means:
- If your flow is high but hardness is low, choose the vessel on flow
- If hardness is high but flow is low, choose it on resin volume
- Take whichever comes out larger
Top mount or side mount
Vessels come with either a top opening or a side opening for the valve. Which to choose is covered in our top vs side mount guide.
What you need with the vessel
A vessel on its own is not a working system. You also need:
- A multiport valve — see our MPV selection guide
- A distribution system — top distributor and laterals, covered in our distribution guide
- Media — resin, sand, gravel or carbon
- A brine tank for a softener, with a brine director
What to tell us when ordering
- Application — softener, sand filter, carbon filter or DM
- Flow in LPH
- Water hardness or TDS
- Whether you want top or side mount
- The valve size, if already decided
With those details we can specify the vessel, valve and distribution system as a complete set. Browse FRP vessels for what we stock.
Get your vessel sized correctly
Send your flow, hardness and application, and we will specify the vessel, valve and distribution system as a complete set.
💬 WhatsApp par poochhein 📞 9910646957Frequently asked questions
What does the FRP vessel number mean?
It is the diameter and height in inches. A 1054 vessel is ten inches in diameter and fifty four inches tall, and a 1665 is sixteen by sixty five inches.
How do I work out the resin volume for a softener?
Multiply the hardness in ppm by the litres treated per day and by the days between regenerations, then divide by fifty five thousand. For example three hundred and fifty ppm at one thousand litres a day over fifteen days gives ninety five litres of resin.
Why should media not fill more than sixty percent of the vessel?
Because the bed expands and lifts during backwash and needs space above it, known as freeboard. Without that space the backwash cannot clean the media, and media can be carried out through the top distributor.
Should I choose the vessel by flow or by media volume?
Check both and take whichever gives the larger vessel. If flow is high but hardness low, flow decides it. If hardness is high but flow low, the resin volume decides it.
What else is needed besides the vessel?
A multiport valve, a distribution system with top distributor and laterals, the media itself, and for a softener a brine tank with a brine director. A vessel alone is not a working system.