12.2.1 LR Surveyors are to be provided with free access to the manufacturer’s
works to inspect at random the quality control measures and to witness the tests
required by Pt 5, Ch 2, 12.2 Works testing and inspection 12.2.2 as deemed necessary, and to have free
access to all control records and subcontractor’s certificates.
12.2.2 Each individual unit is to be tested in accordance with Pt 5, Ch 2, 12.2 Works testing and inspection 12.2.3 to Pt 5, Ch 2, 12.2 Works testing and inspection 12.2.8. For category C turbochargers these
tests are to be conducted under survey unless an alternative approach for product
assurance has been approved by LR. For category B turbochargers the testing is to be
documented by manufacturer’s certificate. For category A turbochargers, test results,
documented by manufacturer’s certificate, are only required if specifically requested by
LR.
12.2.3 Rotating parts of the turbocharger’s blower are to be marked for easy
identification with the corresponding certificate. Component identification is to be in
accordance with the Rules for Materials.
12.2.5 Cooling spaces are to be hydraulically tested to 0,4 MPa gauge or 1,5 times
maximum working pressure, whichever is higher.
12.2.6 Rotating parts are to be subjected to ultrasonic testing and surface crack
detection (magnetic particle testing is to be carried out on ferro-magnetic materials,
penetrant testing is only to be carried out on non-ferritic materials). Ultrasonic
testing is not required for components manufactured from cast iron.
12.2.7 All rotors are to be dynamically balanced on final assembly.
12.2.8 All compressor wheels are to be overspeed tested for three minutes at
either 20 per cent above the alarm level speed at room temperature, or 10 per cent above
alarm level speed at 45°C inlet temperature when tested in the actual housing with the
corresponding pressure ratio. The overspeed test may be waived for forged wheels that
are individually controlled by an approved non-destructive method, this test will not be
waived for wheels of the unit to be type tested.