25 L chemical dosing pot — clean, safe inhibitor dosing for closed systems
Why use the UKGP-CDP-06 25 L chemical dosing pot?
A chemical dosing pot is the safest way to introduce corrosion inhibitor, biocide, glycol top-up or pH buffer into a pressurised closed heating or chilled-water system. The UKGP-CDP-06 25 L dosing pot lets a service engineer add treatment under full system pressure without opening flanges, hot-tapping the main, or — worse — pouring chemicals into the F&E tank where they evaporate and pollute the roof void. Inhibitor goes in clean, full strength, into the right place; the pot is then drained, refilled with mains water and the engineer moves on.
Capacity, rating and pipework on the 25 L
The UKGP-CDP-06 holds a 25 L charge — enough to dose the inhibitor pack for a typical commercial circuit on a single fill. The vessel is rated 10 barg at 110 °C, which covers virtually every LTHW and chilled water circuit you'll meet. Connections are DN25 BSP, supplied with a full set of valves: top fill ball valve, air vent, sight glass on larger sizes, non-return valve to prevent system contents back-flowing, and a drain ball valve at the base. The complete kit installs as a short, vertical bypass loop in parallel with a section of header.
How to use a chemical dosing pot in service
Close the two isolation ball valves so the pot is taken off-line. Open the top vent to drop pressure, then open the bottom drain to empty the vessel into a bucket. Close the drain and pour the inhibitor in through the top fill cup. Close the fill, open the top vent to bleed air, then open the system isolation valves so flow sweeps the chemical out into the circuit. The whole cycle takes under five minutes and the system never leaves operating pressure.
Material specification & where the dosing pot sits
Body is carbon steel, internally coated with a corrosion-resistant epoxy and externally painted in plant-room blue. Stainless 316L bodies are available on request for systems running aggressive glycol mixes or where the dosing pot will be used to introduce strong acidic descalers. The pot is normally mounted on the boiler return, downstream of the air and dirt separator and upstream of the low loss header — i.e. exactly where the chemical will be drawn through the longest length of pipework on the next pump start.
Inhibitor dose rates and BSRIA compliance
BSRIA BG29 and BSRIA BG50 require a fully treated, inhibited closed system at handover. A 25 L dosing pot is sized to inject inhibitor at the BSRIA-recommended dose rate of 200 ppm for systems up to roughly 25000 litres in volume in a single charge. Always follow the chemical manufacturer's data sheet and confirm the inhibitor reserve at one-month and twelve-month intervals, topping up via the same dosing pot.
Stock and dispatch — ordering the UKGP-CDP-06
The UKGP-CDP-06 25 L chemical dosing pot is £645 ex VAT and is in stock for same-day dispatch on orders placed before 3 pm. Pair it with our matching air & dirt separator and low loss header for a complete plant-room treatment package — linked below.