Pad Mounted Containment

Your response provides no direction or solutions. I have searched for documentation...I was not able to find a process to determine this....that is why I am asking the question. This issue is also time critical.....another reason why I am reaching out to this forum. If I have done so incorrectly, then I will try other forums.

Ask someone to teaqch you how to use a search engine.

Transformer Oil Containment Risk AssessmentFile Format: PDF/Adobe Acrobatsystem wide response to the issue of secondary containment of oil for transformers in service at Corps powerhouses and dam switchyards within Southwestern's ...www.swpa.govwww.swpa.gov/pdfs/.../transformeroilcontainmentworkgroup.pdfclipped from Google - 4/2016Secondary Containment and Impracticability Determinationswww.epa.govhttps://www.epa.gov/.../4_secondarycontainment_impracticability_2014.pdf

Spill Prevention Control and Countermeasure Plan (2013)www

Spill Containment:images.newpig.comimages.newpig.com/wcsstore/.../11Truths_WhitePaper_US.pdf

<...time critical...> and there is no guidance to hand on how to carry out the task? Whatever has the Client been sold?!

Quoting the OP here, from a 2007 post he said, "I am a registered PE in United States".
That statement.....................................leaves me speechless.
<So I'll be beaming up now>

Perhaps he is asking a question about an area he is not an expert in.

No guidance is not surprising these days. Many companies are tight on resources. Since the recession, there have been a lot of layoffs and loss of jobs through attrition. Many of us are now doing other people's jobs in addition to our own, without training. It's not an ideal situation. But I don't blame someone for asking for help on a user discussion forum. I certainly wish I could sometimes.

How hard did you really search?

http://ecmweb.com/content/knowing-liquid-filled-transformer-installation-requirements

you have to keep looking because halfway through....

"but does not include facilities such as pad-mounted equipment and installations in manholes and vaults.""

Lacking knowledge of local regulations, one might design the net volume of the containment to be, say, 20% more than the total volume of oil in the transformers. Design the perimeter of the containment so no transformer projections overhang it.

Consider what to do about precipitation that might partly fill the containment.

Well, it would have to contain at least 1500 gallons. Add, say, 10% extra for luck. Add a bit more to cater for rainwater...

"Robert is your mother's brother." - Anon

Standardise that.

Check the National Fire Protection Association (NFPA) codes. Most local governments adopt the applicable NFPA codes although sometimes they go with stricter particulars, so check local code enforcement agencies also.

Go to the USDA's Rural Development web site (link below) and download their Bulletin 1724E-302 "Oil Plill Prevention & Control." That should give you some pointers and references. Other good documents there as well, including their "Design Guide for Rural Substations."

http://www.rd.usda.gov/publications/regulations-guidelines/bulletins/electric