Standards

ROTOR BALANCING QUALITY IN RIGID CONDITION

  • Standard ISO 1940/1-2003 (summary)
  • Standard ISO 1940/1-2003 (table)

ACCEPTED VIBRATION LEVELS ON ROTATING MACHINERY

    • Standard E 90 300 - ISO 2372

STANDARD ISO 1940-1:2003
Dynamic Machine Vibration

MECHANICAL VIBRATION - QUALITY REQUIREMENTS IN BALANCING FOR ROTORS IN A CONSTANT (RIGID) CONDITION - PART 1: SPECIFICATIONS AND VERIFICATION OF BALANCING TOLERANCES

  • Summary

ISO 1940-1:2003 gives specifications for rotors in a rigid (constant) state. It specifies the balance tolerances, the number of correction plans required, and methods for verifying the residual imbalance.
Recommendations for the quality of balanced rotors in the rigid (constant) condition are also given, depending on their type and maximum rated speed. These recommendations are based on global experience.

ISO 1940-1:2003 also aims to facilitate the relationship between the manufacturer and the user of rotating machinery, by defining acceptance criteria for the verification of residual imbalances.
Additional information on errors associated with balancing and residual imbalance determination is provided in ISO 1940-2.
ISO 1940-1:2003 does not apply to rotors in the flexible state. The quality criteria for a balanced rotor in the flexible state are defined in ISO 11342.

STANDARD ISO 1940-1:2003

Dynamic Machine Vibration

BALANCING QUALITY LEVELS FOR DIFFERENT REPRESENTATIVE RIGID ROTOR GROUPS

G4 000

  • Crankshaft drive(3) of slow-speed marine diesel engines(4), rigidly mounted, with an odd number of cylinders

G1 600

  • Crankshaft drive, rigid mounting, large double-timing engines

G530

  • Crankshaft drive, rigid mounting, large four-timing engines
    Crankshaft Drive, Elastic Mounting, Marine Diesel Engines

G250

  • Crankshaft drive, rigid mounting, high-speed four-cylinder diesel engines(4)

G100

  • Crankshaft drive of high-speed diesel engines(4) with six or more cylinders
  • Complete engines(5) (petrol or diesel) for cars, trucks and locomotives

G40

  • Car wheels, Wheel Rims, Wheel Assembly, Drive Shafts
  • Crankshaft drive, elastic mounting of high-speed engines(4) with four-timing (petrol or diesel) with six or more cylinders
  • Crankshaft drive of car, truck and locomotive engines

G16

  • Drive shafts (propeller shafts, cardan shafts) with special requirements
  • Grinding Machine Parts
  • Agricultural Machinery Parts
  • Engine spare parts (petrol or diesel) for cars, trucks and locomotives
  • Crankshaft drive of engines with six or more cylinders under special conditions

G6,3

  • Processing Machine Parts
  • Marine main turbine gears (merchant marine)
  • Centrifugal drums
  • Paper Machine Rolls; Printing Machine Rollers
  • Fans
  • Mounting rotors with gas turbines for aeronautics
  • Flying
  • Pump Impellers
  • Machine tools and common machine parts
  • Large and medium-sized electrical fittings (of electric motors with a rod height of at least 80 mm) without special requirements
  • Small electrical fixtures often mass-produced, for applications that are insensitive to vibrations and/or with vibration-insulating substrates
  • Engine spare parts with special requirements

G2,5

  • Turbines à gaz et à vapeur y compris les turbines marines principales (marine marchande)
  • Rotors de turbogénérateurs rigides
  • Tambours et disques de mémoire d'ordinateur
  • Turbocompresseurs
  • Entraînements de machines-outils
  • Armatures électriques grandes et moyennes avec des exigences particulières
  • Petites armatures électriques ne se qualifiant pas pour l'une ou les deux conditions spécifiées pour les petites armatures électriques de degré de qualité d'équilibrage G6,3
  • Pompes à d'entraînement par turbines

G1

  • Tape recorder and phonograph (gramophone) training
  • Grinding Wheel drive
  • Small electrical fittings with special requirements

G0,4

  • Precision Wheel Spindles, Discs and Armatures
  • Gyroscopes

(3)   A crankshaft drive is a set-up that includes the crankshaft, flywheel, clutch, pulley, vibration dampener, rotating part of the connecting rod, etc.

(4)   In this part of ISO 1940, slow diesel engines are those with a piston speed of less than 9 m/s, fast diesel engines are those with a piston speed of more than 9 m/s.

(5)   For complete engines. The rotor mass comprises the sum of all the masses that belong to the crankshaft drive described in Note 3 above.

STANDARD AFNOR E 90 300 - ISO 2372
Dynamic Machine Vibration

ACCEPTED VIBRATION LEVELS ON ROTATING MACHINERY

Group 1: Elements of motors or machines which, under normal operating conditions, are intimately linked to the whole of a machine. (Typical examples of machines in this group are the series-produced electric motors with an output of up to 15 kW.)

Group 2: Medium-sized machines, (especially electric motors with a power between 15 and 75 kW) without special foundations. Rigidly mounted motors or machines (power up to 300 kW) on special foundations.

Group 3: Large motors and other large machines with their rotating masses mounted on rigid and heavy foundations, relatively rigid in the direction of vibration.

Group 4: Large engines and other large machines with their rotating masses mounted on foundations that are relatively flexible in the direction of vibration (e.g. turbo-generator sets, especially those installed on light foundations).