Second oil tank

oil-2-4-6-gas

get out a tape measure --the new 1 is on longer legs but from the picture they don't look to be different

Michael_38

Second Oil Tank

Added second oil tank. Original tank (87) says on the plate its 275 gal but compared to the new one is it *quite* a bit smaller ?

Anyhow, tanks are for this install
http://forums.invision.net/Index.cfm?CFApp=2&Message_ID=409675
hoping for one fill this season

Edward A. (Ed) Carey_3

Problems

Mike,

It appears that you have a 275 and a 300 (or maybe a 330) twinned.

The real problem is that the two tanks are different heights. Given that they are connected together at the bottom and liquid will seek its common level, if you fill both of the tanks to the top the oil level will be above the top of the 275.

I can not see the top of the 275; however it should have its own vent alarm gauge. Vent alarm gauges are never supposed to be exposed to liquid oil. They only should have air displaced from the tank passing through them. They are not leak proof if filled with oil.

If the 275 has a vent alarm gauge like the one in the top of the larger tank, the vent alarm in the 275 will leak oil when you fill both tanks to the top.

Also, the vent pipes should not be connected together at an elevation lower than the top of any fill pipe opening. If they are connected together, (at the proper elevation above the fill pipe opening)) then the outlet pipe should be at least on size larger than the largest individual vent pipe connected into to it.

Ed Carey

Michael_38

thanks ed, the grey tank says 275 and when i bought the black tank it said 275 on the plate. side by side the are obviously not the same size ? Both tanks have vent whistles, yes, i need to think...

how about if i use the ball valve to isolate the smaller tank until the larger is say 1/2 full or vice-versa

Michael_38

ohh, i am such a dub. 10" legs on the old on 12" on the new $#^T makes me want to puke...

Dave Belisle

As Ed said , the vent pipes per NFPA 31 can not be tied together until they are above the fills.

So the best thing to do is vent each tank separately ........ Then you are good to go...

Dave in NH

Norm Harvey

One other thing in addition to Ed's comments, With a filter on each tank before the equalizing line, the tanks will not level appropriately as the filters become full. I recommend the equalizing line be piped in at least half inch and before the filters. That way the tanks will level appropriately.

That being said, the "level" will be skewed due to the different tank heights as Ed points out.

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ChasMan

Perhaps

One is US 275 and the other Inperial 275.

Brad White_202

Or

one might be a double-wall tank as many areas now require. The actual net tanks would be about the same dimensions and of course, volume.

Alan R. Mercurio_3

Forgive me for being critical but it looks like the pipe dope used on the fittings is Teflon based? If so this could also cause trouble down the road. Just a friendly heads up.

Your friend in the industry,
Alan R. Mercurio

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