Boiler Induced Draught (ID) Fan Impeller

Improve the lifetime of a boiler induced draught fan (ID Fan) impeller

Services Used: Engineering Design, Project Management, Fans & Air Handling


A new design was engineered to improve the lifetime of a boiler induced draught fan (ID Fan) impeller in a large industrial plant. The lifetime of the fan was being shortened by a considerable amount of abrasive dust in the exhaust gases. In particular there was erosion damage to the highly stressed areas of the impeller blades, backplate and bolted-on hub assembly.

Mainstream Engineering Ltd (MEL) ASEL division, was engaged to investigate impeller design options for improved operating life. Theoretical wear life calculations on an improved design indicated at least a 50% increase in operating life.

Features of the MEL design included an aerodynamically designed impeller inlet, cutaway backplate, replaceable bolt-on blade and backplate wear plates, separate replaceable blade nose pieces and a welded hub assembly with wear liners. Wear liners made from abrasive resistant material (450 HBW) and the impeller was built to AS/NZS 1554.4: 2014.

Design: Heavy duty backward inclined plate bladed impeller
Impeller diameter: 1,567 mm
Speed: 1,050 rpm at design, 1500 rpm during grate cleaning
Impeller Tip Speed: 86.2 m/sec design, 123 m/sec during crate cleaning
Control: Variable speed drive (VSD)
Arrangement: Duct inlet
Materials: High strength steel + abrasion resistant wear liners
Design temperature: 230 C


Contact us to engineer your solution

Other MEL Work

Machine safety guarding

Safety guard hazard assessment audits through to design and installation of safety guards.

Read More

Boiler ID Fan Impeller Assembly

Design, supply and installation of an impeller and shaft (rotor assembly) for a Boiler ID fan.

Read More

Factory Roof Replacement

Asbestos roof replacement and contamination containment

Read More