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7. Checking and maintenance
7.1.2
Chemical sweeping
A. General principle
Boilers are traidtionally swept mechanically. There are now
chemical sweeping methods which facilitate this maintenance
work.
A chemical reagent is applied to the boiler's heating surfaces.
After application, the reaction is completed by igniting the burner.
The initial deposits are neutralised and pyrolised. The remaining
pulverent residues are easy to remove by sweeping or vacuum
cleaning.
B. The products
The product must be suitable for boilers with a cast iron body.
Various manufacturers offer products in the form of a
concentrated liquid or aerosol.
The aerosols are packaged in 0.5 to 1 l spray cans for treating
domestic boilers. Refer to the instructions supplied with the
product.
The liquid products are available in 1 to 50 l containers. These
concentrated liquids are diluted before application with a spray.
Sprays exist in various forms suitable for their intended use:
- Low capacity (2 or 3 l) spray with built-in reservoir for small
boilers and moderate frequency. Manual pressurisation of the
reservoir.
- 5 l spray with separate reservoir, nozzle and connecting tube.
The nozzles enable easy application at the back of the
combustion chamber. Manual pressurisation of the reservoir.
- Motor-assisted pressurisation spray with reservoir, nozzle and
connecting tube. These sprays are intended for intensive use.
22
8800N063
PK 550
8800N065
18/03/2016 - 300020192-02
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