Dead Bottoms in Crude Oil Tank

Volume of clean tank minus volume of sediment/deposits equals dead bottom.

_{(I don't have a clue if this is right)}

That sounds like a lot of dead bottoms...How ever I don't know what a dead bottom is, so let's say 1cm of muck...

If you say the average depth is 12" then the formula would be 1' times (.785)*( 290'²= 84100)= 66019 cf

Dead Bottoms is also referred to as sludge as it lacks oxygen.

Something is confused. You say 'only to clean the tank first ring, ...' but then you give the bottom area. Surely you're cleaning out the bottom?

The area of a circle, the bottom, A = ∏ * D² / 4 = 66,052 ft²

The area of a ring, the side wall, A = ∏ * D * H = 7,288 ft² I doubt you are concerned about the volume on the side wall.

The volume of a cylinder, V = A * depth. If the average depth is 30" (2.5'), the volume of sludge would be 66,052 * 2.5 = 165,130 ft^3.

Your supplier says 6,253 dead bottoms, what are the units? (I've heard of a miner's inch, but not a dead bottom. Ok, let the jokes begin.) If he is the haul-off supplier, he may be using yd³. Since there are 27 ft³ to a yd³, 6,253 yd³ would be 168,831 ft³, which would be very close to the 165,310 calculated above.

To get a more accurate estimate of the volume, you could sub-divide the floor, say into 50' x 50' squares, measure the approximate average depth of each square and calculate the volume of each square and add them all up. Are you bidding this lump sum?

Bigg,

in our contract, we sign for 3000 and a fee per barrel for every barrels above 3,000. One of the things we did not do as the job was completed last week, we did not get the tank surveyed to ascertain just how much dead bottom/sludge was actually in the tank. The floating roof goes to 61 feet I divided 12" into 750,000 and came up with 12,295 barrels per ft.

The floating roof is in the maintenance position at 8' and we decontaminate the floor, walls and underside of roof which equates to approximately 140,000 sq ft.

No we are not concerned with the wall.

Thanks,

Elvis

Don't understand the contract accounting, don't really need to. Did you get the info you need? BTW, using 7.48 gal/ft³ and 42 gal/bbl, volume per ft is 11,763 bbl/ft. This is based on 290 ft, which is probably the OD. Volume based on actual ID would be a little less, depending on wall thickness.

Bigg good morning,

yes, thank you very much our numbers are consistent but have more than a scientific point of discussion for My meeting of later today.

Many thanks and trust that our paths cross again, I live in the Bahamas if you are ever in the Bahamas Freeport, ask for Elvis a. Hepburn, if someone does not know me, leave....perhaps you are in a bad side of town......LOL.

Take care and again, thanks to you and CR4 Team.

Best wishes,