Is there any standard to describe how long a commissioning test is valid?

[parlitu]

I start commissioning test for some switchgear 2 years ago. I did not finish commissioning, and due to company low budget, I had to stop this work for 2 years. Are those test that have been performed still valid? Or those test should be repeated again? Is any Standard that describe this? I will definitely repeat some, but will be just my judgement.

 

[DTR2011]

Some of it will have to be a judgement call. For example, if the equipment has not been moved and has stayed in a clean and dry environment that may indicate there is less re work to do. If you tested secondary wiring and nothing has changed, again less.

A large oil filled transformer sitting outside, that has been moved, without heaters in the control cabinet is another issue altogether.

I do not know of any relevant standards off hand that address this issue directly.

 

[rasevskii]

parlitu:

Your question is a bit unclear. If the switchgear was commissioned and tested, then left idle and deenergized for 2 years, then you should basically repeat all the tests before putting in service. It depends on the environment also: If it was indoor and in a dry and protected space, not energized for the 2 years, it still has to be retested again. If it was outdoor in a wet and humid environment with no heaters connected, expect a lot of damage from rust and corrosion, possibly replacement might be the better option. What is the voltage level? As smallgreek says, it is a judgement call.

rasevskii

 

[farmape]

Not sure of any standard.
Commissioning Definition:
Process by which an equipment, facility, or plant (which is installed, or is complete or near completion) is tested to verify if it functions according to its design objectives or specifications.
Personally, I would perform 100% required commission tests, using maintenance test values as applicable. Understand the equipment is already 2 years old on site.