Fabrication of Chimneys and Liners
JPen (John Patrick Engineering)
Fabrication of steel ducting and chimneys
JPen are experts in the supply of chimneys and ducting serving a variety of purposes: heat recovery and exchange (including Combined Heat and Power [CHP] systems), gas recycling, ventilation and system exhausts.
JPen ducting and chimneys are typically manufactured in mild steel, stainless steel or cromweld. Materials used for manufacture range from 1.5mm to 15mm thickness, dependent on the nature of the gases being transported.
As well as painted and galvanised finishes, JPen can arrange insulation and cladding of ducting and chimneys prior to or after installation. In addition, JPen supplies all necessary associated equipment, such as fans, dampers, supports, inspection points, access points and flexible joints for thermal expansion / movement and vibration.
Stainless steel ducting fabrication
Should the construction need to be highly resistant to corrosion and distortion then a stainless steel base material would be required as galvanised and mild steel materials would not be suitable. As any chemist would agree, the chromium content within the alloy is able to react with the air to form a chromium oxide barrier. The barrier is what protects the metal crystalline lattice from erosion, thus greatly extending the life span of the product. Stainless steel also provides superior strength and durability, taking these factors into consideration including the longevity of the product will yield a cost effective option over the spend life cycle.
The welding skills required to join stainless steel are highly experienced to expert. It is crucial for all welds to be structurally sound though the fabrication process.
Chimneys are laid out to ensure they are straight, preventing problems in assembly on site.
Onsite assembly of a cone to top an existing chimney.
Chimney base section under construction. They are insulated and clad prior to dispatch.
Chimney base section under construction. They are insulated and clad prior to dispatch.
Chimney section being welded
JPEN applications of steel ducting
A strong demand for JPen’s work resides in providing bespoke venting and air way solutions for factories, processing plants and commercial buildings. Whilst the majority of projects tend to be focused on exterior venting, the company portfolio includes numerous custom made internal mild steel ducting arrays, predominantly created for heating ventilation and air conditioning systems.
Due to the internal setting and therefore protection from an external environment, the galvanisation process on the mild steel is adequately sufficient to provide anti-corrosion protection for the daily of this type of ducting system.
Supporting infrastructure for steel ducting and chimneys
The main stacks and sections of both ducting and chimneys will always be supported by lattices and quite often access gantries and walkways. JPen fabrication operations can also design and provide the appropriate supporting structures to locate, fix and secure any constructions of this type.
