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

High-quality vital mill componentsFLSmidth 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 fi tting 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 infi nite 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

must be used. FLSmidth only uses trunnions manufactured by a limited number of highly qualifi ed foundries, ensuring the fi nal quality meets the highest standards.

Continuous operationIf 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, certifi ed fi tters and welding techni-cians, as well as all the necessary tools and equipment transported to the site.

Project Centre Denmark FLSmidth A/SVigerslev Allé 77DK-2500 ValbyCopenhagenTel: +45 3618 1000Fax: +45 3630 1820 E-mail: info@fl smidth.com

Project Centre USAFLSmidth Inc. 2040 Avenue CBethlehem, PA 18017-2188Tel: +1 610-264-6011Fax: +1 610-264-6170E-mail: info-us@fl smidth.com

Project Centre IndiaFLSmidth Private LimitedFLSmidth House34, Egatoor, Kelambakkam(Rajiv Gandhi Salai, Chennai)Tamil Nadu – 603 103Tel: +91-44-4748 1000Fax: +91-44-2747 0301E-mail: indiainfo@fl smidth.com

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.

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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

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

1. Trunnion2. Tight-fitting bolt3. Mill head4. Trunnion liner5. Bearing liner

Scope of supply Trunnion

Tight-fi tting bolts

Tools for drilling and reaming

Installation manuals and assembly drawing