Single-wall system MKS


The elements of the MKS system provide protection against destructive impact of flue gas upon internal surfaces of flue-gas conduits which extract humid flue gas emitted by modern energy-saving heating equipment fueled by gas and oil.
Due to the more and more common change from traditional solid fuels whose use significantly polluted the natural environment to environmentally friendly gas and liquid fuels, chimneys must be adapted to the new heating equipment and new operating conditions.

The system of single-wall elements facilitates modernization of boiler houses where a serious intervention in the building is impossible. The system allows adapting existing old chimneys to new conditions.

The application of the system consists in selection of appropriate parameters of a new chimney, its diameter which depends on the new heating equipment and the height of the existing chimney, and inserting particular elements of the new steel chimney to the existing ceramic chimney.

The diagrams presented in further pages of the catalog help to select the appropriate diameter of the chimney.

The success of the project depends on the appropriate technical condition of the existing chimney. Its diameter and shape must provide inserting the elements of the new chimney. The project may appear impracticable in case the capacity of the new heating equipment is higher than the thus-far operated, which requires an appropriately large diameter or in case of existing curves or displacements in the axis of the existing chimney.

Heating equipment fueled with oil or gas may be connected to the chimneys which are equipped with flue-gas conduits made from acid-resistant steel.

The construction of the flue-gas conduit should be made by trained personnel and it should follow the current construction regulations, investor"s recommendations and the recommendations of the manufacturer of the system.
Prior to constructing of the flue-gas conduit in the ceramic chimney, the latter should be cleaned of loose ceramic parts inside the chimney and of the excess of the combustion products remaining in the flue-gas conduit. For the purpose of inserting the lengths and profiles, openings of appropriate size must be made in the bottom part of the ceramic chimney (in the area of the connection to the boiler), in the places where additional inspection profiles will be installed and at any curves and chokes of the flue-gas conduit.

The flue-gas conduits shall be installed centrally and firmly in the chimney. The lengths and profiles are inserted into one another. Where technically possible, the smoke conduit may be thermally insulated. Plates of granulated mineral wool or lagging may be used as the insulation layer. All such materials should be certified as non-flammable products.

The diameter of the conduit which connects the boiler with the flue-gas conduit (smoke conduit) should be identical to the diameter of the outlet of flue gas in the boiler to be connected. Neither should the reduction elements be used which reduce the section of the flue extraction conduit along the entire length of the connecting conduit (smoke conduit) or the flue-gas conduit. If necessary, the transition from the diameter of the flue-gas conduit to the diameter of the connecting conduit may be made with the use of the TR 90 or TRR 90 Tee-pipe with the appropriate combination of diameters.

Apart from the aforementioned conditions, the flue-gas conduit should be selected so to provide the flue gas temperature higher than the dew-point for the given boiler along the entire length of the chimney together with the outlet. This condition does not pertain to condensation boilers in case of which flue-gas conduits operating in different conditions (wet) are to be installed.
Table 1 and Fig. 1 present the set of elements for the bottom part of the chimney.

From the Tee-pipe up to the top edge of the chimney the RP lengths are installed via inserting one into another. The number of the elements depends on the height of the chimney.

For the purposes of cleaning and inspecting the flue-gas conduit the KPR inspection profile - a cleanout - must be fitted at the bottom part of the chimney. The opening should be easily accessible and fitted with a tight closure made from a non-flammable material. In case of the MKS system, such closure is provided by K or DR profiles. Where the thickness of the ceramic chimney is significant, the Z extension of the cleanout should be used. The length of the extension should be selected so that the closing element of the inspection faced the external surface of the conduit of the ceramic chimney.

The condensate and the excess of rain water which may penetrate the flue-gas conduit should be removed with the OD or ODZ condensate collector. In case of condensation boilers, the condensate should be removed from the drain to the neutralizer.

The connection pipe should be installed from the outlet of the flue gas from the boiler to the chimney with the ascent of 5%.

The chimney conduit should be closed with the use of the DH (1) roof plate to be fitted at the outlet of the flue-gas conduit from the chimney. The end of the flue-gas conduit should allow free extension due to the thermal expansion of steel. The value assumed for the compensation of the thermal expansion of the lengths (marked "X" in Fig. 2) depends on the entire height of the chimney and the temperature parameters of the flue for a given boiler. The A(2) profile, i.e. the rain flange may be mounted on the roof profile to prevent penetration of the excess precipitation into the flue-gas conduit. The rain flange has a cone underneath to make the condensate flow into the chimney.

After all the lengths and profiles have been installed, space allowing, the elements should be thermally insulated with mineral wool, and the mounting openings in the area of inspection door and connection should be sealed with commonly used construction materials.

After the installation of flue gas extraction has been completed, it is subject to acceptance which consists in the following checks:
• permeability of the flue-gas conduit
• tightness of connections,
• draught of the chimney,
• correctness of the connections and compliance of the flue gas removing parts with the design,
• standard outlet above the roof,
• compliance with the atmosphere protection standards.

The formal acceptance consists in the following:
• checking of the compliance of the installation with the design and documentation made after the installation has been completed,
• checking of the validity of the conformity certificates of the construction, insulation and assembly materials used in course of installation.
The acceptance of the flue gas extraction system should be attended by a licensed chimney sweep and a protocol should acknowledge the acceptance.