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5.5.2 CALCULATION OF THE SMOKE OUTLET DUCT
For the layout of the chimney, we will consider the following indications:
• AISI 316 stainless steel tubes, varnished aluminized steel tubes of minimum thickness of
1.5 mm, porcelain tubes of minimum thickness 0.5 mm.
• Flexible tubes are allowed if they meet the specifications set by the law (stainless steel with
smooth inner wall), the clamps must have a minimum length of 50 mm.
Below is a table in which you can find the limitations for installation:
LIMITATIONS
WITH DOUBLE WALL
TUBE Ø 120 mm
WITH DOUBLE WALL
TUBE Ø 150 mm
Horizontal sections with min. 5% 2 m 2 m
Minimum length (mandatory vertically) 2 m 2 m
Maximum length (with 2 90 ° bends) 5 m 7 m
The maximum length allowed for vertically installed duct has been calculated, with a maximum
of two 90 ° bends and practically no horizontal section (only to cross the wall if necessary).
If the installation is different from the one indicated above, the “equivalent head loss” of the
installation must be calculated.
The
“equivalent pressure loss”
of an installation is the result of the sum of the total meters of the installation, plus
the additional losses that are derived from the following table:
TYPE OF LAYOUT OR ACCESSORY
LENGTH TO SUBTRACT FROM THE TOTAL
ALLOWED
90° curve 1 m
Horizontal span 45° curve 2 m
Accessory in "T" 1 m
Diagonal section 0,5 m
45° curve 0,5 m
The sum of these losses must be less than or equal to the maximum allowable length indicated in the table of limitations.
If this is not fulfilled, the diameter of the smoke duct to be installed should be increased:
LOSS OF LOAD EQUIVALENT ≤ MAXIMUM ALLOWABLE LENGTH