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Wartsila’s User Group Forums General Engine Failure to Trip and Subsequent Damage

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  • #2255
    cholm
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    <p class=”MsoNormal”>On 2020 1002 at approximately 1453 engine 5 tripped for an unknown reason.  Just prior to trip the engine performed a controlled load reduction from full load to about 50% load.</p>
    <p class=”MsoNormal”>Pilot LFO inlet and outlet flow went up 12 lb/min during the event.</p>
    <p class=”MsoNormal”>Engine load output went up just prior to the load reduction.</p>
    <p class=”MsoNormal”>Engine natural gas consumption went up significantly during the load reduction – 1959 to 2128 SCFM</p>
    <p class=”MsoNormal”>All cylinder exhaust temperatures went up significantly during the load reduction.</p>
    <p class=”MsoNormal”>Upon investigation it was noted that select control inputs had stopped working about 16 minutes prior to event:<span style=”font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol;”><span style=”font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 7pt; line-height: normal; font-family: ‘Times New Roman’;”>   </span></span><!–[endif]–>Exhaust gas deviation; <span style=”font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol;”><span style=”font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 7pt; line-height: normal; font-family: ‘Times New Roman’;”>  </span></span><!–[endif]–>Main duration offset; <span style=”font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol;”><span style=”font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 7pt; line-height: normal; font-family: ‘Times New Roman’;”> </span></span><!–[endif]–>Engine speed; Gas pressure; Gas control; Charge air pressure; Charge Air Temperature; Waste gate control; Knock control; <span style=”font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol;”><span style=”font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 7pt; line-height: normal; font-family: ‘Times New Roman’;”> </span></span><!–[endif]–>HT Water Jacket Outlet Temp A-Bank (B-Bank OK); PFI Global; <span style=”font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol;”><span style=”font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 7pt; line-height: normal; font-family: ‘Times New Roman’;”> </span></span><!–[endif]–>Pilot Pump Pressure; Pilot FO pressure control; Fuel Oil Pressure inlet; Main gas pressure; Main gas pressure control; Lube oil pressure inlet; <span style=”text-indent: -0.25in; font-family: Symbol;”><span style=”font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 7pt; line-height: normal; font-family: ‘Times New Roman’;”> </span></span><span style=”text-indent: -0.25in;”>Lube oil temp inlet</span></p>
    Upon slow roll after event loud knocking could be heard on the A-bank indicating damage of some sort.  We checked the big end bearings on all cylinders but found no damage or indication of trouble.  A leak down check on all cylinders could not build pressure on cylinders A2 and A3.  It was discovered that the crowns had separated from the piston skirt during the event.  We are in the process of removing all cylinder heads now for additional discovery.

    On discussion with Wärtsilä they believe that the engine fuel mixture range went through the entire knock range and above – once the mixture went above the knock range the cylinder no longer fired.  Therefore the increase in fuel flow but loss of load.  The severe knock damaged A2 and A3 but all cylinders should be inspected.  Wärtsilä also indicated that the engine control system should not have allowed this to occur and they are looking into the issue on their end.

    Has anyone else using any other Wärtsilä product experienced similar.  If you have questions or wish to discuss further please feel free to contact me at chuck.holm@pge.com
    <p class=”MsoListParagraphCxSpLast” style=”text-indent: -.25in; mso-list: l0 level1 lfo1;”></p>

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