Revamping

Howden France specialises in revamping; the change and/or the retrofit of an impeller in an existing casing, keeping as many as possible of the existing components (concrete foundation, static parts, regulation equipments, motor).

Changing or retrofitting an existing rotor can present a chance to adapt a fan to the actual operating conditions of the plant, with only a short shutdown. Revamping can provide

• adaptation to new environmental standards
• adaptation to new characteristics of the aerodynamic system
• resolution of vibration, abrasion, dust build-up, erosion and temperature problems
• reduction of the absorbed power and consequent energy saving
• reduction of the noise or few frequencies
• increase in fatigue resistance

We can provide solutions for all plants we supplied (in the name of Howden or our ‘precursor’ brands BERRY, NEU, DAVIDSON) or for any kind of installed fans.

Example of increased output from a revamped cement plant
One of our clients wanted to increase the output of their cement plant that was becoming limited by the kiln induced draught fan performance. Dust build up was causing stoppages every two weeks, and fan throughput had declined. Our engineers proposed a new high efficiency rotor and stator and fitted them. The original motor and ducting were retained. Not only has cement production been raised, but there have been no subsequent stoppages because of dust build up. Significant efficiency and energy savings have been achieved.

	Original "as new"	Before revamp	After revamp
Flow	384,000 m3/h	270,000 m3/h	306,000-345,600 m3/h
Power	920 kW	920 kW	693 kW
Cement production		1500 t/d	1800-2000 t/d

Before Revamping	After Revamping

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