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Ball mill trunnion replacement

Drawing on years of experience as a full-service supplier installing high-quality ball mills and replacing trunnions, FLSmidth provides complete solutions ensuring supply and proper installation of high-quality trunnions.

Improved design ensures reliable mill operation

High-quality vital mill components FLSmidth trunnions can be supplied for both FLSmidth and non-FLSmidth mills. Based on proven processes, the improved design reduces stress concentrations, minimising the risk of cracks and subsequent failure. In addition, the design of the tight fitting bolt joint has been improved, further reducing stresses and the risk of failure. Ball mill trunnions and heads are subject to large alternating stresses during operation. Even though trunnions are designed for infinite life, there is always a risk of cracks developing due to small casting defects, wear of the inner surface of the trunnion or other damage, such as cutting scars or welding in the high-stressed areas. To avoid premature failure of such vital mill components, very high quality manufacturing procedures

Project Centre Denmark FLSmidth A/S Vigerslev Allé 77 DK-2500 Valby Copenhagen Tel: +45 3618 1000 Fax: +45 3630 1820 E-mail: [email protected]

must be used. FLSmidth only uses trunnions manufactured by a limited number of highly qualified foundries, ensuring the final quality meets the highest standards.

Scope of supply Trunnion Tight-fitting bolts Tools for drilling and reaming Installation manuals and assembly drawing

Continuous operation If wear or a crack is discovered in a trunnion, FLSmidth can provide provisional on-site repair so that the mill can keep operating until a new trunnion is supplied. Any weld repair of a trunnion must be considered as a temporary solution since new cracks will most likely develop and the repair can result in trunnion deformations, which can cause bearing problems and eventually lead to bearing failure. Therefore, it is strongly recommended to order and install a new trunnion as soon as possible to ensure continuous and reliable mill operation. Supervision and installation services Due to the complexity of a trunnion replacement, plants should make full use of the expert supervision and installation services of FLSmidth. To facilitate a trunnion replacement, it is recommended to have a new bearing liner and trunnion liner on stock. FLSmidth’s on-site services include providing experienced supervisors, certified fitters and welding technicians, as well as all the necessary tools and equipment transported to the site.

Project Centre USA FLSmidth Inc. 2040 Avenue C Bethlehem, PA 18017-2188 Tel: +1 610-264-6011 Fax: +1 610-264-6170 E-mail: [email protected]

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Trunnion Tight-fitting bolt Mill head Trunnion liner Bearing liner

Project Centre India FLSmidth Private Limited FLSmidth House 34, Egatoor, Kelambakkam (Rajiv Gandhi Salai, Chennai) Tamil Nadu – 603 103 Tel: +91-44-4748 1000 Fax: +91-44-2747 0301 E-mail: [email protected]

Copyright © 2013 FLSmidth A/S. ALL RIGHTS RESERVED. FLSmidth is a trademark of FLSmidth A/S. This brochure makes no offers, representations or warranties (express or implied), and information and data contained in this brochure are for general reference only and may change at any time.

www.flsmidth.com

C 11-13 000-0-ENG

FLSmidth has installed almost 4000 ball mills and customers worldwide benefit from this extensive experience that ensures a smooth trunnion replacement. Knowledge gained over the years is used for product development and to further improve the supervision and installation services offered around the globe.