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Conclusions plant shut down necessary for the complete
rotor change with casing modification;
The performance of the fans may be increased by • The three methods of revamping may be com-
modifying some of their parts, but without affecting bined together;
the “outline” dimensions of the plant area. • The fan reliability is not affected.

• The capacity increase may vary from a mini- Boldrocchi S.r.l. has the capability to supply all the
mum of 5% up to 40%; services, starting from the feasibility study up to the
• The pressure and power follow accordingly; supply of the components, the erection and the
• The modifications have a minor impact on the commissioning, including the field balancing and
fan efficiency; performance testing at site. The revamping activity
• The site activity for the modification may vary may be done either on fans supplied by Boldrocchi
from a immediate shut down of the fan, neces- and by any other fan Manufacturer.
sary for the blade tipping, up to a scheduled

Paolo Saccenti

Paolo Saccenti has graduated in Mechanical Engineering at the Florence University in 1979. After a
two years experience in the Italian Navy, as engineer official, he has continued his career in the R&D
department of the Wothington pumps Company: boiler feed pumps area. In 1984 he has joined the De
Cardenas Company involved in the design and production of components for the nuclear power industry.
In 1989 has become the chief engineer of the Marelli Ventilazione (GIEM) fans division. In 1995 has beco-
me the product manager of the big components for power stations of the De Cardenas, Belleli group. In
1997 the Company has become part of the Boldrocchi group where now he is the service and after sales
responsible, the Research and Developments manager and president of one of the Boldrocchi group
Companies. His experience has developed in the rotating machinery field dedicated mainly to the power
generation industry. He is the author of several international papers on the heavy duty fans appeared in
some internationals fans symposiums and magazines. He member of the ATI group and president of the
Bocconi University Alumni association ASDA.

Vincenzo Avolio

Vincenzo Avolio has graduated in Mechanical Engineer at the Milan University in March 2005. He started
his professional carrier in Boldrocchi Fan Company in June 2005 being involved in technical and com-
mercial study about revamping and retrofit project for the modification of existing Fans in order to improve
the performance or the reliability of the machine. He became Fan’s senior expert and learnt how to de-
velop the project engineering after order acquisition and the management of the internal job by following
and direct the designers and project engineers, respecting the planning time for customer satisfaction.

Revamping dei ventilatori

Accade spesso che la produzione dell’impianto possa essere aumentata modificando solo alcuni
componenti, mentre altri hanno capacità sufficiente e sono stati originariamente forniti con suf-
ficiente margine. La modifica e/o la sostituzione di alcuni componenti dell’impianto, quali filtri o
mulini, ecc., richiederebbe l’adeguamento dei ventilatori alle nuove condizioni di funzionamento. La
possibilità di aumentare la portata e la pressione del ventilatore, riducendo al minimo le modifiche
al layout e alla canalizzazione, è un parametro importante che può aiutare a prendere la decisione
di procedere con la modifica dell’impianto. In questo lavoro viene illustrato un caso di revamping di
un ventilatore da forno per l’industria del cemento. L’incremento di prestazioni richiesto dalla mo-
difica impiantistica è stato notevole, obbligando a procedere alla completa sostituzione del rotore.
L’installazione di un nuovo rotore ha comportato il cambio anche dei cuscinetti, l’aggiunta di un
nuovo motore per gestire l’aumento di potenza e infine si è resa necessaria anche una modifica
geometrica al casing esistente.

Impiantistica Italiana - Gennaio-Febbraio 2023 83