Feature 8 | TURBOCHARGER REPAIRS AND MAINTENANCE
due. It must not have suffered any foreign object or transportation damage and never have had any repairs carried out on it previously. Similarly, shafts from TPS turbochargers are only eligible for CPEX exchange once and CPEX parts subsequently have their running time reset to half the recommended SIKO exchange interval The SIKO concept, on which this
CPEX eligibility criterion is based, was developed by ABB to support customers’ efforts to coordinate and optimise their maintenance schedules by identifying the ideal time to exchange key turbocharger components. ABB calculations show that it is only necessary to replace used blades with CPEX blades once during the SIKO recommended running period for a turbocharger in order to save up to seven times that investment in fuel costs. The CPEX programme applies to
turbochargers on both diesel and gas engines in both marine and stationary applications. Parts are stocked with an assurance of 48 hour spare parts availability to minimise engine downtime. CPEX reconditioned exchange parts are refurbished at ABB Turbocharging’s main works in Baden and at selected locations in the group’s worldwide service network. According to the company, close
attention to compressor and turbine geometry is essential to restoring turbocharger performance during overhauls. To ensure this, CPEX reconditioned parts are refurbished according to the same specifications as original parts.
In a signif icant technology
development, for engines burning lower qualities of heavy fuel oil (HFO) and with especially heavy duty operating profiles, ABB Turbocharging has introduced axial turbine blades having hardfaced tips to counter accelerated circumferential wear. In such applications turbocharger performance and service costs can suffer due to build-up of hard, abrasive combustion residues on and around the turbine diffuser. Wear due to contact between the deposits and the rotating turbine blades causes a loss in turbine diameter and hence an increase in exhaust gases bypassing the turbine. Tis both reduces turbocharger and engine efficiency and results in more frequent replacement of complete sets of turbine blades. Using a special, ABB-developed coating
process, a hard wear resistant layer is applied to the extremities of removable turbine blades. Nicknamed “dragon’s teeth”, only six of the hard tipped blades need to be fitted in pairs at 120degs intervals around the turbine wheel. At this even spacing they are able to scrape away the hard HFO fouling to clear a path for the standard blades, thus minimising contact with the abrasive residues. Te 120degs spacing of the coated blades also assists rotor balancing as well as ensuring a well distributed scraping effect. As well as new turbochargers, the new hard tip solution is also offered as part of a retrofit package by ABB. For users wanting close support of turbocharger servicing rather than
complete delegation, ABB Turbocharging is now offering Managed Maintenance Agreements (MMAs). Under MMAs, ABB proactively informs the end user of an approaching service event well in advance and prepares a quotation which takes the form of standardised, predefined service packages including negotiated fixed labour rates. MMAs are intended to give the turbocharger end user the benefits of early ordering while allowing ABB to support the management of the equipment. Demand for the OPAC package is
steadily increasing the company states. ABB Turbocharging offers engine operators the chance to delegate responsibility for maintenance, repair and planned overhauls of turbochargers to its global network of OEM standard service outlets. For a fixed price per operating hour and covering an agreed number of operating hours – for example 20,000 or 60,000 - ABB Turbocharger assumes responsibility for the operation of the turbocharger, helping to ensure prompt, well planned servicing and preventive maintenance. Only original ABB Turbocharger service parts are used and all work is carried out by ABB Turbocharging’s own service personnel. Among prominent recent OPAC
agreements is the first with an engine builder as opposed to an engine operator. This agreement covers ABB Turbocharging’s TPL69A turbochargers on type LH46LA/6L35MC engines from Hanshin Diesel of Japan. SRCT
When Time is of the Essence QUALITY
TURBOCHARGER PARTS, REPAIR & SERVICE
Premier Supplier to the Americas!
Whenever & Wherever you need it!
TurboUSA, Inc. • Office & Technical Center • 3005 SW 2nd Avenue - Suite 105 • Ft. Lauderdale, FL 33315 - U.S.A. Toll free: 877-887-2687 • Tel: 954-767-8631 • Fax: 954-767-8632 •
info@turbo-usa.com •
www.turbo-usa.com
48 Shiprepair and Conversion Technology 3rd Quarter 2010
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