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SERVICE BULLETIN SB-ALL-A-048-01 ADVISORY Subject: NOZZLE RING NIP A. TURBOCHARGERS AFFECTED All turbochargers. B. REASONS FOR BULLETIN Due to increased use of Heavy Fuel Oil (HFO) mechanical cleaning of the nozzle ring may be necessary in addition to scheduled maintenance activities. In order to maintain nozzle ring integrity outer ring must be clamped between the shroud ring and the gas inlet casing. When the nozzle ring is removed it is possible that the outer ring may not exhibit the nominal dimensions and be smaller than when originally fitted. Therefore the security may be compromised if the original clamping is not restored prior to re-installation. This bulletin provides guidance for all personnel performing mechanical cleaning of the nozzle ring. C. CHANGES / MODIFICATIONS Nozzle outer ring to be restored to original dimensions. © Napier Turbochargers Ltd 2009 CONFIDENTIAL This bulletin is the exclusive property of Napier Turbochargers Ltd (Napier) and is disclosed in confidence to Napier customers solely for their use in connection with the operation and maintenance of their Napier turbochargers. Its contents shall not be used for other purposes or copied or disclosed without written authorisation of Napier. The information set out in this bulletin is offered by Napier as part of its ongoing product support services for you as one of its customers. However, the final decision for operating your plant in a safe and responsible manner rests entirely with you. This involves many factors outside our knowledge and control, and therefore Napier is unable to accept (and hereby disclaims) any liability (whether based on breach of contract, warranty or statutory duty, negligence or otherwise) for damage or loss of any kind which may be incurred as a result of applying this information. SB-ALL-A-048-01 Page1 of 5 All correspondence to: Napier Turbochargers Napier Turbochargers Ltd P.O. Box 1 Registered Office: Waterside South Ruston House Lincoln LN5 7FD England Waterside South Tel: +44 (0) 1522 516666 Lincoln LN5 7FD England Fax: +44 (0) 1522 516669 Registered in England No. 06512358
Transcript of SB_ALL_A_048_01
SERVICE BULLETIN
SB-ALL-A-048-01
ADVISORY
Subject: NOZZLE RING NIP A. TURBOCHARGERS AFFECTED All turbochargers. B. REASONS FOR BULLETIN Due to increased use of Heavy Fuel Oil (HFO) mechanical cleaning of the nozzle ring may be necessary in addition to scheduled maintenance activities. In order to maintain nozzle ring integrity outer ring must be clamped between the shroud ring and the gas inlet casing. When the nozzle ring is removed it is possible that the outer ring may not exhibit the nominal dimensions and be smaller than when originally fitted. Therefore the security may be compromised if the original clamping is not restored prior to re-installation. This bulletin provides guidance for all personnel performing mechanical cleaning of the nozzle ring. C. CHANGES / MODIFICATIONS Nozzle outer ring to be restored to original dimensions.
© Napier Turbochargers Ltd 2009 CONFIDENTIAL This bulletin is the exclusive property of Napier Turbochargers Ltd (Napier) and is disclosed in confidence to Napier customers solely for their use in connection with the operation and maintenance of their Napier turbochargers. Its contents shall not be used for other purposes or copied or disclosed without written authorisation of Napier. The information set out in this bulletin is offered by Napier as part of its ongoing product support services for you as one of its customers. However, the final decision for operating your plant in a safe and responsible manner rests entirely with you. This involves many factors outside our knowledge and control, and therefore Napier is unable to accept (and hereby disclaims) any liability (whether
based on breach of contract, warranty or statutory duty, negligence or otherwise) for damage or loss of any kind which may be incurred as a result of applying this information.
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All correspondence to: Napier Turbochargers Napier Turbochargers Ltd P.O. Box 1 Registered Office: Waterside South Ruston House Lincoln LN5 7FD England Waterside South Tel: +44 (0) 1522 516666 Lincoln LN5 7FD England Fax: +44 (0) 1522 516669 Registered in England No. 06512358
Scope Clamping of the nozzle ring (“nozzle nip”) is achieved as the nozzle outer ring is dimensionally larger by design than the space it is being installed into (gas inlet casing-shroud ring – “A” in Fig 1). When it becomes necessary to perform mechanical cleaning or remove the nozzle ring for other reasons the outer ring may not exhibit the nominal dimensions (“F” in Fig 2). Should this dimension not be restored the nozzle ring could experience premature cracking due to insufficient clamping. To prevent this and ensure a “positive” nozzle nip is maintained it is essential the nozzle ring is checked by measurement, and if necessary gently formed to bring it back in line with original dimensions (Figs. 2 & 3).
Gas outlet casing
Gas inlet Casing
Dimension “A”
“C” Seal
Shroud ring
Nozzle Figure 1: Gas Inlet Casing – Shroud (“A”)
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Nozzle Ring Width
(Dimension "F") Gas Inlet Casing – Shroud (Reference Dimension “A”)
Turbocharger Nominal (mm) NA295 44.06 43.82 NA297 49.46 49.20 NA355 53.39 52.86 NA357 61.88 61.50 NA457 55.76 55.10 NA557 70.77 70.00 NA298 45.25 44.95 NA307 49.46 49.20 NA397 61.84 61.50
NA458 72.00 70.87
Dimension “F”
Figure 2: Nozzle width
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Before final reassembly the gas inlet casing less gasket/seal can be installed to the gas outlet casing to confirm a positive nip (Fig.3). The resultant gap between the casings will be the amount by which the nozzle outer ring will be clamped.
“C” Seal
Nozzle outer ring face on the turbine side to be manipulated and restored at approximately 6 points between each blade using an adjustable spanner or
similar to achieve dimension “F”.
Figure 3: Part Identification
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E. IMPLEMENTATION This bulletin is graded Advisory. To ensure prolonged trouble free operation it is recommended this instruction is followed each time the nozzle ring or related components are removed for maintenance. Author
D Smith Post Design Support Engineer
Authorised Technical Manager
I Pinkney
Head of Customer Services
G Rodgers
General Manager
A R Thacker
Date of Issue: 27th January 2009 Distribution: Napier Turbochargers – OE, Service, Test Customers – Engine Manufacturers (End Users), Authorised Service Centres
