JPS5970918A - Measurement of oil depth in float-roof type oil tank - Google Patents

Abstract

PURPOSE:To easily and rapidly obtain an accurate depth value, by a method wherein a gauge batch is provided to a working place provided to the upper end part of a side plate so as to be coincided with the position of the opening part provided to a float roof on a vertical line and a wt. is fallen below an oil surface through the opening part. CONSTITUTION:A working place 3 is constituted to the upper end part of the main body 1 of a float roof type oil tank where a spiral stairway goes up to the top and a gauge hatch 4 or sampling hatch through which a tape measure 4 with a wt. to be used in depth measurement is inserted is mounted. The position of the opening part 6 provided to the float roof 5 moved up and down in the tank corresponding to the increase and decrease of the oil amount received in the oil tank is coincided with the position of the gauge batch 4 on a vertical line. The wt. 15 of the tape measure 14 to be used in depth measurement flallen so as to be inserted through the gauge hatch 4 is sunk below an oil surface through the opening part 6 of the float-roof and the tape measure is extended until the lower end of the wt. 15 is contacted with the lower base point O of the tank bottom 2. Subsequently, the tape measure is drawn up and the numerical value of a position showing the oil surface level is the desired value to measure the oil depth of the oil tank.

Description

DETAILED DESCRIPTION OF THE INVENTION Currently in Japan, land oil (1'+
Floating roof oil tanks are widely used in Japan.Why is this floating roof oil tank used as a storage tank for volatile oil? Floating roof force that moves up and down as the output increases and decreases;? The floating roof is placed in the tank and the oil surface is shielded by a floating roof, eliminating the empty space where volatile gases can exist between the roof and the oil surface, thereby suppressing the generation of flammable gas.
1! In addition to minimizing the consumption of oil in the tank to reduce economic losses, it also suppresses the release of flammable gas to the outside of the tank to prevent disasters and make a significant contribution to pollution control. It is something to do.

However, the structure of this floating roof type oil tank is a cylindrical tank with an open upper part and a nearly perfect circle. A work place is provided, and a hollow pipe that penetrates the floating roof housed in the tank and opens at the bottom of the tank is vertically fixed in the work place, and several oil pipes are placed below the lowermost part of the floating roof. The hollow tube is constructed into a blind tube without making any oil holes beyond that point, and this hollow tube is used as a support for the floating roof, and the floating roof is moved up and down along the support. In the conventional oil depth measurement method, this hollow tube is used as a gauge pole, a tape measure with a weight for sounding is inserted into this hollow tube, and the weight is lowered below the oil surface. When measuring the depth of the oil level by lowering the weight until it reaches the base plate at the bottom of the tank, or by lowering the weight slightly below the oil level and measuring the value between the oil level and a fixed point on the gauge ball, use the value. In some cases, the oil depth is determined by using the value obtained by subtracting the subsidence value as a scale, and a capacity light dedicated to the oil + 1"+ is created in each oil tank, and the capacity corresponding to the oil depth is determined by the capacity light. Therefore, soundings are always taken twice before and after receiving and discharging oil, and the soundings are taken before receiving and receiving oil.
The depth measurement after loading and unloading is called the rear scale, and the fluctuation in the amount of oil in the oil tank is calculated from the difference in oil depth between this fnJ scale and the rear scale. However, to calculate this amount of oil, the oil depth value in ml is determined, the specific gravity of the oil and the oil temperature in the oil tank are measured according to standards, and the results are determined according to JIS-2249-19.
80 (Specific Gravity, Weight, and Volume Conversion Table for Crude Oil and Petroleum Products, Published by the Japanese Standards Association) and the Oil Tank Capacity Light (This capacity light is determined by a professional appraiser who actually measures the oil tank in detail and determines the minimum depth and price tag, and the capacity is in liters. The delivery quantity is determined by the difference in capacity determined by the AfJ scale (however, the standard trading temperature for oil is 15°C). However, this oil tank capacitance light is normally created with the top surface of the substrate on the bottom of the tank located directly below the gauge pole as the lower base point (0), and in this measurement method, the upper Dm aperture of the gauge ball, J: I ) There are cases where the oil depth (2) is determined directly by lowering a tape measure with a weight, and there are cases where the oil depth is determined by measuring the scale above the oil surface.

That is, in the conventional oil depth measuring method, a hollow tube is established vertically from the top of the oil tank to the bottom of the oil tank, and is fixed to the oil tank side plate.The vertical hollow tube is used as a gauge ball, and this vertical hollow The tube acts as a support for the floating roof, and the floating roof uses this hollow tube as a support to move up and down.

Furthermore, the gauge balls used for this sounding form several oil holes only in the areas below the lowest point of the floating roof, and the floating roof rises.On the other hand, no oil holes are formed in the areas where the floating roof rises. The purpose of this is to prevent volatile gas from leaking from the circumferential surface of the gauge pole and to discharge flammable gas to the outside of the tank to prevent disasters. However, there is a height difference between the oil level in the gauge ball and the oil level in the oil tank due to the difference in specific gravity, making it impossible to determine the true oil depth.

In other words, when measuring the oil depth inside this gauge ball, the oil in the gauge ball enters and exits only through the lower end opening and several oil holes, and only moves up and down within the gauge ball that exists above the oil hole. However, if there is a difference between the specific gravity of the oil in the gauge ball and the specific gravity of the oil in the oil tank, a difference (d) will occur in the front of the two, and ? 11] Specific gravity of oil in the tank> When the specific gravity of the oil in the gauge ball is, the oil level in the gauge ball is higher than the oil level in the oil tank by (f), and the specific gravity in the oil tank is higher than the specific gravity in the gauge ball. In the case of , the opposite is true, which causes measurement errors and makes it impossible to accurately calculate the amount of oil.

Also, if the storage oil tank is for crude oil, a large amount of oil sludge will accumulate at the bottom of the tank, blocking the bottom opening of the gauge ball and the oil passage hole.
There will be a huge difference between the oil level in the gauge borer and the oil level in W1 (W1), and the difference may be as much as 1 meter. It is impossible to set the amount of oil at a constant value.

Furthermore, as shown in Figure 4 of the attached drawings, the external shape is a fixed-roof land oil tank with a floating roof inside, and this type of floating-roof oil tank is mainly used to store products such as gasoline and jet oil. The material that makes up the internal floating roof is aluminum or steel, but in this type of oil, the upper fixed roof, side plates, and gauge balls form a mutual relationship to perform sounding work, so workers go around and climb the stairs. When the oil tank reaches the fixed roof, slight vibrations occur in the oil tank body, and the vibrations propagate to the gauge ball, causing the oil level in the sounding tube to oscillate, resulting in the disadvantage that it takes time to check the oil level. In addition, when using a sounding tape measure with a weight submerged in a narrow oil level in a gauge ball, not only does the oil level move up and down, making it impossible to obtain accurate sounding values, but also due to the difference in specific gravity mentioned above. Errors are added and the sounding is repeated, and there are many drawbacks to using gauge balls to determine the oil depth. There is a general need for an improved measurement method that is easy to implement and can yield accurate sounding results, and the present invention is intended to meet these demands.

To describe the embodiment of the present invention in detail with reference to the accompanying drawings, a working place (3) is constructed at the upper end of the main body (1) of a floating roof type oil tank which has climbed a circular staircase θ. 3
), a gauge hatch (4) or a sampling hatch through which a tape measure with a weight for sounding is inserted is attached, and the floating roof (5) is housed in an oil tank and moves up and down in the tank according to increases and decreases in oil volume. ), the position of the opening (6) (usually a trap structure) and the position of the gauge hatch (4) are aligned on a vertical line, and the depth sounding probe is inserted into the gauge hatch (4) and lowered. Submerge the weight a0 of the tape measure (14) through the opening (6) of the floating roof below the oil level, and place the weight a0 on the upper surface of the substrate (d) on which the tank bottom (2) K is to be laid, that is, the lower base point (0). Sounding work is carried out by extending the tape measure until the bottom end of the weight 00 touches it. After confirming that the bottom end of the weight 0υ is in contact with the board (d), pull up the tape measure and check the oil level (g). If you read the number at the indicated position, that number is the oil depth (to) of the oil tank.

This sounding operation is usually repeated several times, and the average value is used to determine the oil depth.

In addition, in oil tanks that store crude oil, the oil tank "
It may be difficult for the oil sludge on the bottom to reach J (the upper surface of the board (2') where the weight of the tape measure is at the sounding position due to Z accumulation, that is, the lower base point 0), and in this case, It becomes impossible to determine the oil depth of 0, and in such a case, the
The sounding method (Ll) is from the oil level currently contained in the oil 1iQi to the sounding reference point on the oil tank, that is, from the lower base point (0) to the upper sounding base point P). It is a scale that expresses the distance between the highest sounding height and the highest sounding height up to the present time.By calculating this Kujira shaku (goods), subtract Kujira shaku■ from the maximum sounding height 0 shown in the oil tank capacity table. , the value is 41" + the oil depth determined by dropping the weight directly to the bottom (■).

To explain the method of determining the whale scale 0 in the water tank using Figure 1 of the attached drawing, the sounding operator (corporate) climbs the circular staircase (13) to reach the work place (3) constructed above the oil tank, and installs it at the work place. Set the upper base point of the sounding or the upper end of the opening of the sampling hatch (4) as the base point, hang a weight 0$ through the above (4), extend the tape measure, and open the opening of the floating roof (5). After (6), lower the weight a to below the oil level (G), submerge a part of the tape measure in the oil, stop lowering the tape measure, and then set the value on the tape measure at the upper reference point or ) is read at the position of 0 and is taken as the predetermined length (Q) at the time of sounding.The desired whale length 0 can be obtained by using the following formula.

U=L-A U...Gap Measure t...Length of the tape measure submerged below the oil level (G) Next, use the following formula to find this whale measure ([J] to oil depth ■) OD = H-U D...Oil Depth H...The gauge hatch (4) installed at the sounding work place (3) shown in the oil tank drowning table is as follows:
The hollow tube that was previously installed as a sample collection nozzle can be used in common. Also, as shown in Figure 5, the gauge
・Instead of a notch, there are cases where a supporting metal fitting OQ is attached to the work place (3) to find the contact plate (tighten Iη to determine the upper base point e), and then the tape measure 04) is fixed to perform deep oil work. In addition, a worker may descend onto the floating roof and hang down the tape measure 04) directly from the opening (6) of the floating roof to take a sounding, and at this time the weight of the worker on the floating roof will increase due to the sinking of the floating roof. In practice, this sounding work is no different from doing it from above the work site.

Thus, the oil depth measurement method according to the present invention is different from the conventional measurement method in which the oil depth is measured in a narrow, isolated area with almost no oil exchange inside a hollow pipe for steadying the floating roof. Defects are removed, the oil surface is opened widely and the oil level is stabilized, and the oil level can be easily and quickly measured to improve work efficiency. This is a new and remarkable product that will be of divine benefit to petroleum trading companies and related industries, as it will further promote the calculation of oil prices.

[Brief explanation of the drawing]

The attached drawings show embodiments of the present invention. Figure 1 is a longitudinal sectional view of a floating roof type oil tank, Figure 2 is a plan view, and Figure 3 is a fixed roof type oil tank with a floating roof installed inside the tank. FIG. 4 is a partially enlarged sectional view of FIG. 1, and FIG. 5 is an enlarged sectional view of a support fitting installed on a work place. (1)... Oil 41' body, (2)... Tank bottom, (2)...
・Substrate, (3)...Working area, (4)...Gauge, notch, (5)...Floating roof, (6)...Opening, (7)...
Floating body, (8)... Slide banking, (9)... Support leg, Oo... Hollow tube for steady rest, 0υ... Opening, (2)...
・Oil hole, α■... Circumferential staircase, 04)... Tape measure for sounding,
0 uniform... weight, 0... support metal fittings, θ force... plate, 01
10...Fixing screw, O))...Oil depth, (d)...Difference in specific gravity, (f)...Oil level, (f)...Oil level in the ball, α Yu...
Sounding height, (V...prescribed length, (Foundation)...worker, (0)...
・Lower base point, (P)..." Bipartite base point, (B)...Whale scale. O / 1st son f 2 Box procedure amendment September 22, 1982 1, case indication 873 57th patent application + 81074
No. 2, Title of invention: Method for measuring oil depth in Atsuya-style oil tank 3
, relationship with the consideration that accumulates?Applicant 4? l! Positive object Out U*l[V 1'lbi[ll'l[+5,? 4. Contents of the suspension (1) October 1, 1981 written in the section indicating the patent filing in the application W review request η is amended to read October 15, 1988 J. (2) In line 15112 of the specification, the phrase ``1 night level (f) inside the bamboo tank j'' is corrected to ``oil level (F'') or inside the oil tank j. (3) In the statement i1100 year old line, “Paper production location (3) F
Correct cJ to ``Creation place (3) j.
r>J; b is corrected as r(F')J. 121 to 91-

Claims (1)

[Claims] At the work area provided at the upper end of the side plate of the floating roof type oil tank, a gauge gauge for inserting a tape measure with a weight for sounding is installed, and the oil level is 4.
11! Store it in i? The position of the opening μ in the floating roof that moves up and down in the tank according to the increase or decrease in the output volume, and the gauge no.
Align the position of Sochi on a vertical line, and pass the weight of the tape measure hanging down through the gauge no Tsuchi through the opening in the floating roof? A method for measuring oil depth in a floating roof oil tank, which is characterized by descending below the surface of a mountain and measuring the oil depth.