But since a surfboard isn’t a perfect rectangular cube, the equation becomes a bit more complex. Well, the basic calculation for volume would be all those measurements multiplied together (L x W x H = V). We all know our standard surfboard dimensions: length, width, and height (or, in the case of surfboards, thickness). Okay, let’s make our math teachers proud. But now, it’s time to put away the doodles it’s time to finally understand this important measurement and how it effects which board you decide to ride. And since you clicked on this article, you probably were, too. Maybe I should’ve paid more attention in geometry class, but alas, I was probably busy drawing perfect waves in my notebook. Stair Height- Hs = 1 M, Length (Ls) = 1.3 M, Width (Ws) = 1.2 M and Slope is 37.5 degree (as per the related Standard) mostly we take 30 to 40 degree.Full disclosure: I came into this article knowing nothing about surfboard volume. Largest Tank Working Capacity- WCT6= 700 cubic meter Calculation for the above case-ĭiameter of Foundation- D = Diameter of Tank + 0.5 M
After finalization of the required height, add a 200 mm free board as per OISD-118 to this height, and the outcome of this sum will be the actual height of the dike wall.If the dike encloser Volume is >= Larger tank volume, then consider the height which is assumed otherwise go the next height till the condition matched.After deduction, the volume will be compared with the volume of the largest tank.Start calculating with the minimum height assumption.Initially, we need to assume the dike wall height for the actual calculation.To get the actual volume of the dike enclosure, we have to deduct the Dead volume (Volume of the other tanks except the largest one, tank foundation of all the tanks till the dike wall height, Firewalls, and Concrete Stairs inside the encloser) from total dike encloser volume.The volume of the Dike encloser should be >= Volume of the largest tank of the Tank Farm.Important conditions for Dike Wall Height Calculation 1) below which shows the arrangement of Tanks, Minimum Separation Distances, and the Gap between the Tank’s steel and Dike wall as per OISD-118. By following the above steps for the allocation of Tanks, we can find the shortest Length & Width of the Tank farm.We have to arrange in the same manner as the above for the rest of Tanks one smaller and one larger alternatively, by keeping in mind both directions X & Y.Now, Place the second-largest Tank next to smallest or second smallest Tank.Position the second smallest Tank next to the largest Tank (at the free space either row or column).Choose the smallest Tank (as per diameter) and position next to the larger one at any of the free space (either in row or column).Position the largest Tank (as per diameter) at any corner of the Tank farm.But, here only one tank is of Class-C so we are arranging in single Tank Farm but we will have to follow the safety consideration as per Class A & B. As per OISD-118 we should design Tank farm separately for Class A & B Fluid and Separate for Class C Fluid.So, there will be only one Dike Encloser/Tank Farm. The tank roof type is a fixed roof and the total capacity of Tanks are not exceeding 60000 cubic meters.Minimum Distance between the Tank’s Shell and the inside surface of the dike wall will be 0.5 times the height of Tank (0.5*H).Note- Take the diameter of the larger tank always. The separation distance between the tanks will be as per table 5 of OISD-118 as Capacity and Diameter are not exceeding 5000 cubic meters and 9 meters respectively (0.5D for the class A & B and 0.5D/6 meter (whichever is minimum) for Class A & C or B & C).Largest Tank’s Capacity is not exceeding 50000 cubic meters, hence there will be two rows of tanks in the Tank Farm.The total capacity of all the six tanks is not exceeding 5000 cubic meters and the diameter of the largest tank is not exceeding 9 meters, hence Firewalls are not required for this case.Tank Farm Design Consideration as per OISD-118 The Foundation shape is circular and without a shoulder.ģ. Foundation Height for all the Tank is 400 mm and Diameter is Tank diameter + 500 mm.Ģ. CAPACITY (CUBIC METER) HEIGHT (METER) DIAMETER (METER) PETROLEUM CLASS of Storage Fluid T1 425 9.6 7.5 CLASS-B T2 450 9 8 CLASS-A T3 400 9.3 7.4 CLASS-B T4 380 9.1 7.3 CLASS-B T5 455 9.7 7.7 CLASS-A T6 700 12.5 8.5 CLASS-C Total 2810 NA NA NA Notes:ġ.