Marine Bearings (IMPA 77)
IMPA section 77 covers the rolling-element and rotary bearings that support shafts throughout a ship's auxiliary machinery — pumps, separators, fans, compressors and electric motors. Most bearings are commodity items identified by an international bearing number such as 30322, which lets a purchaser cross-reference any manufacturer and order against a pump-overhaul package. The highest demand is for tapered roller and deep-groove ball bearings used in high-speed rotary service, where running clearance and preload matter. Because a failed bearing can take a critical auxiliary out of service, technical superintendents keep these on a planned-overhaul cycle and source them by bearing number and grade. This hub organises the common bearing types and the cross-reference approach that lets a buyer specify the exact bearing for a pump or separator overhaul.
Bearing numbers and cross-reference
A standard bearing number (for example 30322) resolves to a defined bore, outer diameter and width across manufacturers, so a buyer can cross-reference and order the correct grade for the duty.
Regulatory overview
Bearings are generally internal machinery components outside MED and USCG scope, but material and dimensional conformity to the international bearing standard is essential, and class records expect traceable supply for critical rotating machinery.
Dominant OEMs
Common sub-components
- Tapered roller bearings
- Deep-groove ball bearings
- Cylindrical roller bearings
- Thrust bearings
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Related
Frequently asked questions
- How are marine bearings identified?
- By an international bearing number that defines bore, outer diameter and width across manufacturers.
- Can I cross-reference bearing brands?
- Yes. The standard bearing number lets you cross-reference and order the correct grade for the duty.
- Do bearings need class certificates?
- They are internal components, but class records expect traceable supply for critical rotating machinery.