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Liquid-in metrological verification method for vertical metallic tank with an outer floating roof

A technology of metrology verification and metal cans, applied in the direction of measuring devices, mechanical measuring devices, instruments, etc., can solve the problem of spending hundreds of thousands to millions of dollars and half a month or even one or two months, affecting the production of enterprises, etc. question

Inactive Publication Date: 2005-09-07
国家大容量第一计量站
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the vertical metal tank with external floating roof is a large metering tank, it will cost hundreds of thousands to millions of yuan and half a month or even a month or two to clean up the tank once, which will affect the production of the company.

Method used

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  • Liquid-in metrological verification method for vertical metallic tank with an outer floating roof
  • Liquid-in metrological verification method for vertical metallic tank with an outer floating roof

Examples

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Embodiment Construction

[0053] The liquid-carrying measurement verification method of the vertical metal tank with the outer floating roof includes technical condition preparation, environmental condition monitoring, equipment self-inspection and self-calibration, verification method, data processing process and uncertainty evaluation and other steps. The specific measurement of the verification can be divided into external measurement and tank internal measurement when the external floating roof is completely lowered to the bottom of the tank according to the tank type and the requirements in JJG168-87 "Vertical Metal Tank Capacity" and the actual measurement operation method. There are six parts: measurement, measurement inside the tank at the low position after the outer floating roof is fully lifted, measurement of reference height, measurement of total height of the tank body, and measurement of accessories inside the tank.

[0054] 1. External measurement:

[0055] 1.1 When the tank body is not...

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Abstract

The invention discloses a method for certifying the out floating upright canister with liquid, which divides the volume of the canister into several parts and certifies individually, get the corrected value's algebraic sum. The measuring comprises outer measuring, inner measuring when the out floating roof fall on the bottom completely, inner measuring when the out floating roof floats completely, reference height measuring, the total height of the tank, the accessories in the tank. The diameter of the girth sheets can be measured through circumference by perisphere ruler or through the radial missing of the girth sheets relative to the base circle based on the measured diameter of the base circle. The measuring of tank bottom is through pulling supporting leg out and setting target on the floating roof. The measuring of reference height can use annular tube ruler with clean function.

Description

1. Technical field [0001] The invention relates to a method for verifying the capacity of a large tank, in particular to a method for verifying the capacity of a vertical metal tank with an external floating roof. 2. Background technology [0002] The vertical metal tank with outer floating roof is a kind of vertical metal tank, which is widely used in petroleum refining, chemical enterprises and oil storage and transportation in ports and wharves. Vertical metal tanks with external floating roofs are large metering tanks. Usually in accordance with the requirements of the national metrology verification regulations JJG168-87, the verification cycle of vertical metal tanks shall not exceed 4 years. When the new tank or overhauled tank reaches the re-inspection period after the initial inspection, the tank must be re-inspected. At present, the verification of the bottom of vertical metal tanks with external floating roofs is based on the premise that the liquid in the tank ...

Claims

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Application Information

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IPC IPC(8): G01B5/00G01B11/02G01B17/02G01B21/00
Inventor 佟明星白胤王玉清郑鹤
Owner 国家大容量第一计量站
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