GB/T 11348.2-2012Mechanical vibration -- Evaluation of machines vibration by measurements on rotating shafts -- Part 2: Land-based steam turbine-generators in excess of 50MW with normal operating speeds of 1500r/min, 1800r/min, 3000r/min and 3600r/min (English PDF)

1 Scope

This section GB/T 11348 gives the rotation axis at or near the site evaluation main bearing radial vibration measured at the intensity of specific regulations set. include.

--- Normal steady-state operating conditions of vibration;

--- Transients (including the raising speed or deceleration, plus initial load and load changes), the other (non-steady-state) conditions during vibration;

--- Normal steady state vibration changes during operating conditions.

This section applies to the rated operating speed 1500r/min, 1800r/min, 3000r/min or 3600r/min, the output power is greater than

50MW of turbines and generators installed on land, but also for direct connection with a gas turbine and a steam turbine (or) a generator (such as the United

Combined cycle applications). Under these circumstances, the guidelines in this section apply only to the steam turbine and generator (including synchronizing clutch). Gas Turbine Vibration

Motion shall GB/T 11348.4 and GB/T 6075.4 comment.

These vibration values specified in this section is not the sole basis for evaluation of vibration intensity. For large turbines and generators often

Evaluated by vibration measurements on non-rotating parts. These vibration measurement requirements, see GB/T 6075.1 and GB/T 6075.2.

2 Normative references

The following documents for the application of this section is essential. For dated references, only the edition date of this Part apply to

Minute. For undated references, the latest edition (including any amendments) apply to this section.

GB/T 11348.1-1999 rotation measurement and evaluation criteria - Part 1 mechanical shaft radial vibration. General (idt, ISO 7919-1.

1996)

3 Measurement Methods

Measurement methods and instruments should be consistent with GB/T 11348.1 of the general requirements.

Turbines and generators early contact with the sensor shaft absolute vibration. Now, with the development of non-contact sensor switch

Relative shaft vibration measurement more common. However, if desired, can also be a non-contact sensor mounted on the carriage and a measure of structural vibration

Inertial sensors to vector synthesis output them to get the absolute vibration of the shaft. Currently, two methods are generally used. therefore,

For this part, relative or absolute shaft vibration measurements are equally acceptable. It should be noted that the frequency range of the proximity sensor than the non-contact

Sensor narrower (more restrictive).

For monitoring, the measuring system should be able to apply from 1Hz to be at least three times the maximum normal operating frequency or 125Hz (whichever is greater

Person) frequency range. Instruments for troubleshooting, you may need to cover a wider frequency range of spectral analysis and (or). On special occasions, which was

The low-frequency vibrations may spread to machines (for example, in the earthquake zone), it may be necessary to filter out low frequency response of the instrument and (or) provide appropriate time

Inter delay. If the comparison of the measurement results of different machines, should be taken to ensure the use of the same frequency range.

GB/T 11344 | GB/T 11349.1 | GB/T 11348.4 | GB/T 11349.2 | GB/T 11348.3 | […]