MELBURY HE 3800-10000 -
Installation, Use and Maintenance
18.12.2020
Page 29 / 36
4.7. Flue gas system
The Melbury HE boilers have been developed using
the latest technologies. The perfect balance existing
between boiler and chimney ensures optimal fuel use
and economical system operation as a result.
The pertinent rules of technology and good practice as
well as the country-specific regulations and valid
standards must be observed.
4.7.1. Section determination
Sections must be calculated for boilers without draught.
Fuel type, power output, combustion gas temperature
and quantity, chimney construction and height are all
important elements in determining sizes.
4.7.2. Flue gas tubes
We recommend the use of flue gas tubes made from
acid-resistant, non-corrosive materials. The tube must
be laid and introduced in the chimney to an inclination
of 30-45° to minimize pressure loss. The tube will
have to be inserted in such a way as to prevent any
condensation reversal from the chimney down into the
boiler. To avoid vibration transmission, combustion gas
tubes must be fitted with adequate sleeve tubes or
clamps. Connections exceeding 1 m in length should
be insulated.
At the same time, ensure that the measuring pipes
extend beyond the insulation and that flanges and
cleaning covers remain accessible.
The chimney must be designed so that it is gas and
pressure-tight as well as moisture-insensitive and acid-
resistant.
