scope:

Scope, purpose and applications

This standard establishes uniform procedures for determining the acceptance of new marine propulsion machinery with respect to vibration of seagoing and inland ships of all lengths, excluding icebreakers.

NOTE - This standard covers vibrations of ships in steady underway conditions but does not include the vibrations resulting from special operations such as the crushing of ice by an icebreaker.

This standard covers propulsion systems with turbine (both gas and steam), electric and diesel drives with single or multiple shafts, thrusters, and cycloidal propeller and waterjet systems. Propulsion systems have higher vibration magnitudes than most other shipboard machinery because of propeller excitation. There are some special requirements, such as avoiding thrust reversals in the thrust bearing and torque reversals in the gear trains. Table 1 presents a summary of acceptance criteria.

Although this standard is intended for new ships, it can also be used during the life of the ship to check for mechanical damage, performance monitoring and evaluating a repair, provided, however, that some allowances are made for wear, erosion of parts, etc.