Transformer vault installation

[dminunni]

We recently discovered that one of our transformers was leaking oil. I have been assigned the task of replacing this pad mounted transformer with a new 2000KVA transformer mounted on a containment vault to contain any possible future oil leaks. I have never done this and was wondering if anyone can give me any guidance as to what to look for as far as the vault design. Are the vaults designed to be weather resistant? Would a sump pump be needed?

Thanks

 

[patrick7]

there are companies that manufacture oil containment pits
with sumps that trap the oil and allow the water to leave.
might want to to a search for oil containment enclosures.
i will look for the flyer that i had. not sure where it got to.

 

[jghrist]

See
IEEE guide for containment and control of oil spills in substations

IEEE Std 980-1994

Abstract
In this IEEE standard the significance of oil-spillage regulations and their applicability to electric supply substations are discussed: the sources of oil spills are identified, typical designs and methods for dealing with oil containment and control of oil spills are discussed; and guidelines for preparation of a typical spill prevention control and countermeasures (SPCC) plan are provided

 

[BJC]

Check the local precast concrete vault manufacturer.
Here's one that's all over the country.

http://www.oldcastleprecast.com/

Any containment system that catches oil will also catch rainwater. You will need to monitor the vault for water level.
The installations I have done use a float switch that indicate when the water level is high. When it is high someone had to sample the water if there was no oil it was pumped into the storm water system.
There are seperate vaults with oil traps in them. The company above for one makes them. For a 2,000 KVA transformer I would duct the vault under the transformer to a vault with a wier/absorber material in it. Get some help this is what environmental engineers do.

 

[peebee]

Check out the Envirodrain system. It uses a baffle that water can pass through, but it absorbs small amounts of oil. In the event of a major leak, it will swell up and block the drain pipe stopping any water or oil from passing through. No need to manually go dump water each time it rains.

Other than that, your only major design concern about sticking the transformer below grade would be flooding (other minor concerns might include access, confined space permits, cooling air, etc.).

 

[dminunni]

Thank you all for the information. I appreciate the help.