Maintenance3425−1/A1
Winterthur Gas & Diesel Ltd.
4/ 9
1.3 Service Life − Calculate
Use the formula below to calculate the deterioration rate of a piston ring:
WR =
(D1−D2) x 1000
T2−T1
Where:
D WR = Rate of deterioration (mm/1000 hrs)
D D1 = First recorded thickness of the chrome-ceramic layer (mm)
D D2 = Second recorded thickness of the chrome-ceramic layer (mm)
D T2 = Hours (hrs)
D T1 = First recorded operation hours (hrs).
See Table 1 for examples of the results.
Table 1: Examples of Deterioration Rate
D1
D2 T1 T2 WR
0.382 0.367 0 (new) 1500 0.01
0.351 0.340 3500 5000 0.0073
Use the formula below to calculate the remaining piston ring service life:
LT =
(D2−Dmin) x 1000
WR
Where:
D LT = Remaining in-service time (hrs)
D D2 = second recorded thickness of the chrome-ceramic layer (mm)
D Dmin = Minimum thickness of the chrome-ceramic layer (mm) (see
paragraph 2.2)
D WR = Calculated rate of deterioration (mm/1000 hrs)
Table 2: Example for Remaining Service Life
D1
D2 Dmin T1 T2 WR LT
0.382 0.367 0.05 0 (new) 1500 0.01 31700
0.351 0.340 0.05 3500 5000 0.007333 39545
Piston Rings: Wear of Piston Rings and Ring Grooves
2015
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