Decalcification and cleaning of temperature control circuits
For cleaning of closed circuits
DT-EK-pumps: designed for operation with diluted citric acid or ascorbic acid (DT-N CL931)
DELTATHERM® descaling pumps allow the cleaning of any closed circuit and are very suitable for the descaling of pipes, hot water tanks and heat exchangers.
The DT-EK pumps are designed according to the modular system, are resistant to chemicals and allow clean, rational working without dismantling system parts.
Limescale residues can thus be attacked from both sides.
Clean heat exchangers ensure process reliability and product quality
A tiny film of dirt in heat exchangers can significantly impair heat transfer and strongly deteriorate both process reliability and the product quality itself. Regular cleaning of the circuits prevents this effect and eliminates production problems.
The DT-EK pumps are equipped with a flow switching valve.
DT-EK pumps quality features
- Acid-proof materials
- Practical handling
- Cold and warm operation (up to approx. 50°C)
- Designed for 24-hour continuous operation
DT-EK with switchable multi-way control valve for stepless regulation of pressure and flow rate as well as for control of flow and return.
We recommend the cleaning agent DT-N CL931 for this purpose.
| Head | 6 | m |
|---|---|---|
| Flow rate | 50 | l/min |
| Speed | 2800 | l/min |
| Tank capacity | 50 | l |
| Temperature | to 50 | °C |
| Weight net | 12,8 | kg |
| Height | 580 | mm |
| Length | 710 | mm |
| Width | 460 | mm |
| Hose connection | 3/4 | R |
| Motor | Single-phase - alternating current 220 V, 50 Hz / 0,37 kW | |
| Protection class | IP 55, Overload protection |
- DT-N CL931 is a highly concentrated low odour liquid detergent for the chemical cleaning of water-bearing systems.
- DT-N CL931 removes lime, rust, oil and grease-containing soiling with simultaneous
passivation of steel and grey cast iron surfaces. - DT-N CL931 infiltrates the existing deposits and partially dissolves them from the
metallic substrate. This effect leads to a fast and cost-effective removal of the coatings. - DT-N CL931 also emulsifies greasy components and disperses insoluble dirt particles.
The incorporated inhibitor protects steel, stainless steel, copper, copper alloys, hot-dip galvanised and chromium-plated parts. - The protective effect is confirmed by the Forschungs- und Materialprüfungsanstalt Baden-Württemberg with test report no. V 800989.2
Product description: DT-N CL931 is a yellow viscous liquid; contains mineral acid, corrosion inhibitors, dispersants and wetting agents. DT-N CL931 is not sensitive to frost or heat. pH value (10%): 1.3 + 0.2 |Density: 1.44 + 0.02 g/cm³ at 20 °C container: 25 kg
Application concentration 10 – 20% (90 – 80 l water plus 10 – 20 kg DT-N CL931). The maximum working temperature is 50 °C.
The pump in the circuit circulates the solution. Cleaning can also be carried out using the circulation method with our DT-EK decalcification pumps.
The cleaning process can be monitored by determining the pH value of the cleaning solution. At a constant pH-value below 2.0 the dissolving of the lime deposits is finished. At pH values above 2.0, the cleaning solution must be re-sharpened with DT-N CL931. Maximum exposure time up to 8 hours, repeat procedure with fresh solution if necessary. After cleaning with DT-N CL931, the system should be rinsed very thoroughly and neutralised with DT-N 8735.
When processing DT-N CL931, the hazard warnings and safety regulations given on the product label (e.g. wear suitable protective gloves and goggles) as well as the provisions of the relevant accident prevention regulations of the trade associations, in particular VBG 1, and the safety data sheet must be observed. When handling DT-N CL931, ensure that the working areas are well ventilated.
Application table
| Material | Steel / Stainless steel | Copper | Hot dip galvanised, |
| Conzentration | 10 – 20 % | 10-20 % | 10 % |
| Temperature | max. 50 °C | max. 50 °C | max. 40 °C |
| Duration | max. 8 hrs | max. 8 hrs | max. 8 hrs |
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