Disclaimer: The author is not trying to present himself as an authority on all available CM standards. This blog post is simply an attempt to help those who may be unaware that such guidance exists or of the extent of such standards.
We previously introduced a series of international standards pertaining to condition monitoring of industrial equipment with vibration analysis in,This series ends with the numeric sequence of xx816-x. The original standards from 1974 (ISO 2372) and 1985 (ISO 3945) were replaced or superseded by ISO 10816-1 in 1995. 10816-1 was amended in 2009 and then replaced by ISO 20816-1 in 2016. Next (numerically) is the standard we also mentioned in our previous blog, 20816-2. The dash 2 standard covers the measurement and evaluation of vibration on large land-based gas or steam turbines and generators.
The subsequent standard in the series, the “dash 3” standard is the focus of this blog. This standard is titled:
INTERNATIONAL STANDARD ISO 10816-3
Mechanical vibration — Evaluation of machine vibration by measurements on non-rotating parts
Part 3: Industrial machines with nominal power above 15 kW and nominal speeds between 120 r/min and 15 000 r/min when measured in situ
ISO 10816-3 is the current standard in the series that covers a general range of equipment types and sizes. When first created it was the “catch-all” standard used for many types of machines (such as centrifugal pumps which are now covered by the dash 7 standard) that have since come to be covered by their own specific part of the series. The “10816” issuance of the dash 3 standard is still in force, but to be current it must be joined by a 2017 amendment, “Amendment 1”. This amendment actually modifies the scope of the standard, so it is critical to its being considered current.
The scope of this standard is quoted below from the ISO.org preview page (quotation in bold).
Important Note: The scope shown in the preview cannot be considered current because it is modified by Amendment 1.
This part of ISO 10816 gives criteria for assessing vibration levels when measurements are made in situ. The criteria specified apply to machine sets having power above 15 kW and operating speeds between 120 r/min and 15 000 r/min.
The machine sets covered by this part of ISO 10816 include:
- steam turbines with power up to 50 MW
- steam turbine sets with power greater than 50 MW and speeds below 1 500 r/min or above 3 600 r/min (not included in ISO 10816-2)
- rotary compressors
- industrial gas turbines with power up to 3 MW
- electrical motors of any type
- blowers or fans
NOTE: However, the vibration criteria presented in this part of ISO 10816 are generally only applicable to fans with power ratings greater than 300 kW or fans that are not flexibly supported. As and when circumstances permit, recommendations for other types of fans, including those with lightweight sheet metal construction, will be prepared. Until such time, classifications can be agreed upon between the manufacturer and the customer, using results of previous operational experience, see also ISO 14694.
The following are excluded from this part of ISO 10816:
- land-based steam turbine generator sets with power greater than 50 MW and speeds of 1 500 r/min, 1 800 r/min, 3 000 r/min, or 3 600 r/min (see ISO 10816-2)
- gas turbine sets with power greater than 3 MW (see ISO 10816-4)
- machine sets in hydraulic power generating and pumping plants (see ISO 10816-5)
- machines coupled to reciprocating machines (see ISO 10816-6)
- rotodynamic pumps including integrated electric motors, i.e. where the impeller is mounted directly on the motor shaft or is rigidly attached to it (see ISO 10816-7)
- rotary positive displacement compressors (e. g. screw compressors)
- reciprocating compressors
- reciprocating pumps
- submerged motor-pumps
- wind turbines
The criteria of this part of ISO 10816 apply to in situ broad-band vibration measurements taken on the bearings, bearing pedestals, or housing of machines under steady-state operating conditions within the nominal operating speed range. They relate to both acceptance testing and operational monitoring. The evaluation criteria of this part of ISO 10816 are designed to apply to both continuous and non-continuous monitoring situations.
This part of ISO 10816 encompasses machines that may have gears or rolling element bearings but does not address the diagnostic evaluation of the condition of those gears or bearings.
The criteria are applicable only for the vibration produced by the machine set itself and not for vibration which is transmitted to the machine set from external sources.
To read the ISO’s preview of this standard, click here.
Condition Monitoring, Vibration Analysis by Mike Fitch CRL