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Double wall chimneys

Double wall chimneys con­sist of two pi­pes (in­ner and ou­ter) with dif­fe­rent dia­me­ters. Lon­gi­tu­di­nal joint of the­se pi­pes are plas­ma wel­ded, ends of pi­pes are formed with hydraulic expansion machine which makes it easy to connect elements with each other and secure proper tightness of joints. Dia­me­ters of pi­pes de­pend on the out­put of he­a­ting equip­ment.  Ther­mo insula­tion la­y­er is lo­ca­ted bet­we­en the­se pi­pes, which pro­tects a chim­ney from sud­den co­o­ling and condensate formation. Thic­kness of ther­mo insu­la­tion la­y­er va­ries from boiler fu­el type.  “Vilpra” uses “ROCKWOOL“ insulating material which is nonflammable, chemical-proof and eco-clean.

Double wall chimney inner pipe diameter can vary from 100 mm to 900 mm. Chimney is easily moun­ted from 1.0, 0.5 or 0.3 m long chimney sections and connected with each other using stainless steel clinchers and connecting support bands.

The­se chim­ne­ys may be moun­ted on the ou­ter wall of dwel­ling hou­se or in­si­de the buil­ding. Several boilers with the same fuel type can be connected to one double wall chimney if necessary. In this case customer must have designed solution.

Double wall chimneys technical parameters, materials used in manufacturing, chimney types and usage options are listed below, in tables 1 and 2.

Table 1. Main materials used to manufacture double wall chimneys and their technical specifications

Material	Marking	Usage options
Acid-resistant stainless steel sheet	EN 10088-2 - X2CrNiMo17-12-2/1.4404, thickness 0.6,  0.8, 1.0 mm, T600  (AISI 316 L)	Chimney inner wall
Stainless steel sheet	EN 10088-2  - X5CrNi 18-10/1.4404, thickness 0,6 mm (AISI 304)	Chimney outer wall
Galvanized tin	EN 10142- RAGAL 51 F DX51D+Z275 M-A (EN 10142:2000) – thickness 0.6, 0.8 mm	Chimney outer wall or air channels
Coloured galvanized tin	Thickness 0.45mm	Chimney outer wall
Armoured mineral wool mat	„ROCKWOOL“  - Wired Mat 105, thickness 25mm with galvanized, non-flammable	Gas and liquid fuel
Armoured mineral wool mat	„ROCKWOOL“ Wired Mat 80“thickness 50 mm with galvanized, non-flammable	Solid fuel

Table No. 2. Double wall chimney types and using options

Inner wall	Outer wall	Marking	Usage options
Acid-resistant stainless steel sheet	Coloured galvanized tin	NP/ZN	All fuel type
Acid-resistant stainless steel sheet	Acid-resistant stainless steel sheet	NP/NP	All fuel type
Acid-resistant stainless steel sheet	Coloured galvanized tin	NP/RA	All fuel type
Galvanized tin	Galvanized tin	ZN/ZN	Ventilation

Using coloured galvanized tin, the colour of double wall chim­ney outer wall may match the co­lour of the hou­se ro­o­fing perfec­tly or might be­co­me an ori­gi­nal ac­cent of the hou­se ex­te­rior. 

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