**4.4 ISO vibration standards**

20816-1 provides general guidelines;20816-2 covers land-based gas turbines, steam turbines and generators in excess of40 MW, with fluid-film bearings and rated speeds of 1 500 r/min, 1 800 r/min, 3 000 r/min and 3 600 r/min;10816-3 Industrial machines with nominal power above 15 kW and nominal speeds between120 r/min and 15 000 r/min when measured in situ; 7919-3 Mechanical vibration —Evaluation of machine vibration by measurements on rotating shafts— Coupled industrial machines; 20816-4 Gas turbines in excess of 3 MW, with fluidfilm bearings; ISO 20816-5: Machine sets in hydraulic power generating and pumping plants,ISO 10816-6: Reciprocating machines with power ratings above 100 kW,Part 7: Rotodynamic pumps for industrial applications, including measurements on rotating shafts,Part 8: Reciprocating compressors.

ISO 20816-1 provides various evaluation zones: zone A, the vibration of newly commissioned machines normally falls within this zone; zone B, machines with vibration within this zone are normally considered acceptable for unrestricted longterm operation; zone C, machines with vibration within this zone are normally considered unsatisfactory for long-term continuous operation; zone D, vibration values within this zone are normally considered to be of sufficient severity to cause


#### **Table 1.**

*Criteria for assessing vibration measurements.*

#### *IIoT Machine Health Monitoring Models for Education and Training DOI: http://dx.doi.org/10.5772/intechopen.99032*

damage to the machine. The **Table 1** provides summarizes this information for industrial machine falling with in the ISO 10816-3 standard.

ISO 10816-3:2009 is relevant to the common industrial machines and it gives criteria for assessing vibration measurements when made *in situ*. The criteria specified apply to machine sets having a power above 15 kW and operating speeds between 120 r/min and 15 000 r/min. Two conditions are used to classify the support assembly as shown in **Table 1**: rigid supports; and flexible supports. An important application of such a table is get a sense of what are the common measurement values used for the selection of sensor measurement range.
