Section 5 Turbochargers
Clasification Society 2024 - Version 9.40
Clasifications Register Guidance Information - Ship Vibration and Noise Guidance Notes - Chapter 7 Machinery vibration - Section 5 Turbochargers

Section 5 Turbochargers

5.1 In the low frequency range (less than approximately 100 Hz) vibration levels on the turbocharger body should be assessed using Figure 7.3.2 Reciprocating machinery .

Vibration at higher frequencies relating to turbocharger rotor speed and orders thereof should be assessed using Figure 7.2.1 Rotating machinery assessment . Class II is suitable for small frame turbochargers. Class III is suitable for large frame turbochargers found on slow speed diesel engines.

Table 7.5.1 Vibration of AC generating sets driven by reciprocating internal combustion engines

Speed Power Displacement, r.m.s. Velocity, r.m.s. Acceleration, r.m.s.
    Engine Generator Engine Generator Engine Generator
  value 1 value 2   value 1 value 2   value 1 value 2
(rpm) (kW) 1) mm mm mm mm/s mm/s mm/s m/s2 m/s2 m/s2
≤ 3600 > 40   0.64 2) 0.8 2)   40 2) 50 2)   25 2) 31 2)
≥ 2000 ≤ 40   0.8 0.95   50 60   31 38
< 2000 > 200 0.72 0.32 0.45 45 20 28 28 13 18
≥ 1300 ≤ 200
> 100 		0.72 0.4 0.48 45 25 30 28 16 19
  ≤ 100
> 40 		  0.4 0.48   25 30   16 19
< 1300
> 720 		> 1000   0.29 0.35   18 22   11 14
  ≤ 1000
> 200 		0.72 0.32 0.39 45 20 24 28 13 15
≤ 720 > 1000 0.72 0.24 0.32 45 15 20 28 9.5 13

Note 1) Equivalent electrical power, kVA = cos ϕ .kW where cos ϕ = 0.8 (typically).

Note 2) These values are subject to agreement between the manufacturer and customer.

Note 3) Where generators are coupled to the flange housing of the engine the values measured at the engine end of the generator shall meet the values for generators.

Parent topic: Chapter 7 Machinery vibration
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