Small Oil Storage Tank

My Pumphouse uses an oil-engine. In essence it’s much like a diesel in that it is a compression-ignition engine but used oil instead of diesel for a fuel. I need a tank .. if or no other reason then it adds to the scene.

Size the tank(s)

(Fig 1)

The plan was to put the tank in front of the pumphouse up near the track. Fig 1 shows the first design with the tank supported off the ground. That way it could be used to fuel the critters. Since the locos and the pumphouse may very well use different fuels I put a place for a second tank. The space under the tanks could be used for a small pumphouse.

A tank this size – it scales to 5-1/2 ft dia x 16-1/2 ft long would have a capacity of around 2,900 gal.

I ended up with only using one tank and making the support from timber. In any case I’m leaving this bit .. if for no other reason then to show the early concept.

Constraints
Information on the design of the tank is taken from Fuel oil in industry by Stephen Osgood Andros pub 1920 (pages 79-81).
The following advice concerning storage tanks was provided by a Mr. S.D. Rickard, Consulting Engineer, Wayne Oil Tank & Pumping company for storage of oil at small industrial plants etc.

Fuel oil storage tanks should be cylindrical in shape and placed underground so that the top of the shell is at least two feet below ground. These tanks should be of sufficient capacity to allow for a working supply in case deliveries are delayed, and so that tank cars can be entirely emptied as soon as they are received, avoiding demurrage charges. Where shipments are to be received in single carload lots, a 12,000-gallon tank is the smallest size that should be installed. However, many installations embody two or more tanks varying in capacities from 8,000 to 25,000 gallons.

Note: The above was based on the standard 6,000 gal tank car in use at the time.

It should be specified that the tank be fitted with all of the pipe flanges and the manhole at one end of the shell on top. In this way it is possible to build a box with a trap door over one end of the tank whereby all pipe connections and the manhole may be easily gotten at.

It is good practice to fit a fuel oil tank with the following flanges and manhole: one 10″ x 16″ manhole, one 3-1/2″ suction flange, one 4″ fill flange, one l-1/2″ vent flange, one 1-1/2″ return pipe flange, and one 1/2″ indicator flange.

Each storage tank should be fitted with a tank gallonage indicator. These indicators show at a glance the contents of the tank. They may be placed inside of the nearest building, outside of the building against the wall, directly over the tank, or on the side of aboveground tanks.

(Fig 25)

When it is impossible to place the main storage tanks below ground or below the level of the burners, a small 5 or 10 barrel reservoir tank should be placed underground below the main storage. This reservoir tank is then fed by gravity from the overhead tanks. Just inside the small reservoir tank is placed a float valve, as shown in Fig. 25. This valve closes whenever the oil in the small tank reaches a certain level. The suction and return pipes should run from this small underground tank in the usual manner. In this way the danger of flooding a building with oil is avoided.

(Fig 26)

Fig. 26 shows a typical steel storage tank for fuel oil.

Augmentable
The referenced books has the following:

It is good practice to fit a fuel oil tank with the following flanges and manhole: one 10″ x 16″ manhole, one 3-1/2″ suction flange, one 4″ fill flange, one l-1/2″ vent flange, one 1-1/2″ return pipe flange, and one 1/2″ indicator flange.

Pretty cool as this tells me what I need to add to (augment) the tank and then gives me dimensions for everything.

Full Size
O Scale
Notes
Flange
dia
Pipe
dia
10″ x 16″ manhole 0.208″ x 0.333″ A small man or kid would fit but not anyone big. I have some 3/8″ dia Evergreen tubing. That is 18″ full size and I will use that.
3-1/2″ suction flange 0.177″ 0.083″ 8ea 5/8″ bolts on a 7″ bolt circle
4″ fill flange 0.188″ 0.094″ 8ea 5/8″ bolts on a 7-1/2″ bolt circle
1-1/2″ vent flange 0.104″ 0.04″ 4ea 1/2″ bolts on a 3-7/8″ bolt circle
1-1/2″ return pipe flange 0.104″ 0.04″ 4ea 1/2″ bolts on a 3-7/8″ bolt circle
1/2″ indicator flange 0.073″ 0.018″ 4ea 1/2″ bolts on a 2-3/8″ bolt circle


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