S9074-AR-GIB-010/278
15. NDT INSPECTIONS REQUIREMENTS FOR PROPULSION REDUCTION GEARS AND STEAM TURBINE DRIVEN AUXILIARY GEARS
15.1 General. This section contains the minimum inspection requirements for welds and castings used in the fabrication of propulsion reduction gears. 15.2 Inspection requirements. 15.2.1 Propulsion reduction gear components or parts shall be inspected in accordance with table XXII. TABLE XXII. NDT inspection of propulsion reduction gear parts (including steam turbine driven auxiliary gears).
Reference notes
Part of service
MT/PT
UT LT VT
HT
Main element forgings for: Pinions, gears, gear rims, shafts, annulus, carrier
-
-
-
X-VA
X-VA
1, 2
-
-
-
-
X-VA
Teeth of main elements Piping welds (a) Small sections of low pressure such as lube oil supply, including welds joining nipple to casing
2, 3
-
-
-
-
X
X-VA
-
-
-
X
X
4, 5
(b) All other low pressure lube oil piping welded joints made by the gear manufacturer
Welds, fabricated gear elements
X-2
- -
6 -
- -
- -
X
(a) Strength welds (b) All other welds
-
Welds, casing
(a) Strength welds (b) Oil tight welds (c) All other welds
-
- - - - - -
- - -
X-3
6 - - - - 7
X X X
- -
X
-
X - -
X-VA - -
X
X-VA X-3 -
Hubs, cast Thrust bearing housing and caps Lube oil sump
X X
1.) UT shall be in both radial and longitudinal directions using either a shear or longitudinal wave depending upon the geometry of the forging.
2.) Steel forgings shall be examined by the MT method; nonmagnetic materials shall be examined by the PT method.
Original 130
Made with FlippingBook - Share PDF online