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Method for calculating height of venting riser of natural gas transmission pipeline

A technology for venting risers and calculation methods, which is applied in calculations, special data processing applications, instruments, etc., and can solve problems such as difficulty in obtaining safe, accurate and reasonable heights of venting risers, no calculation process, and inability to meet actual application requirements, etc.

Active Publication Date: 2014-04-02
四川庆达实业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes a calculation method to solve the problems that there is no calculation process and formula in the existing method for calculating the height of the vent riser of natural gas pipelines, it is difficult to obtain a safe, accurate and reasonable height of the vent riser, and it cannot meet the needs of practical applications. The process is clear, the formula is simple, the calculation results can obtain the exact height of the natural gas venting riser, and the thermal radiation calculation safety can be achieved under different design parameters and regional level conditions, which can provide an important basis for the design and safety guarantee of natural gas pipelines. An Economical and Practical Calculation Method for the Height of Venting Standpipe in Natural Gas Transmission Pipeline

Method used

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  • Method for calculating height of venting riser of natural gas transmission pipeline
  • Method for calculating height of venting riser of natural gas transmission pipeline
  • Method for calculating height of venting riser of natural gas transmission pipeline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] For a pipeline to transport natural gas, its valve chamber in the first-level area needs to be designed and constructed to vent a riser, and the specific height of the riser is calculated.

[0121] S011. The diameter of the trunk line pipe to which the venting riser belongs is 1026mm (1.026m), and the operating pressure is 5Mpa (5×10 6 Pa), the distance between valve chambers is 32km (3.2×10 4 m), the natural gas compression factor is 0.87, the operating temperature is 20℃ (293K), and the maximum emptying time is 8h (2.88×10 4 s). The area where the venting riser is located is grade one, there is no building within 10m, and the local average wind speed at a height of 20m u ∞ =8.94m / s;

[0122] S012. Calculate the relevant parameters required to calculate the natural gas venting standpipe according to the basic data;

[0123] Among them, the mass flow rate of natural gas venting:

[0124] m q = 2 π D 2 ( P ZRT ) · L T v = 2 π · ...

Embodiment 2

[0147] Calculate the specific height of the valve chamber venting riser of the gas pipeline in Example 1, which is located in the second, third, and fourth level areas.

[0148] S021. The diameter of the trunk line pipe to which the venting riser belongs is 1026mm (1.026m), and the operating pressure is 5Mpa (5×10 6 Pa), the distance between valve chambers is 32km (3.2×10 4 m), the natural gas compression factor is 0.87, the operating temperature is 20℃ (293K), and the maximum emptying time is 8h (2.88×10 4 s). The area where the venting riser is located is grade one, there is no building within 10m, and the local average wind speed at a height of 20m u ∞ =8.94m / s;

[0149] S022. Calculate the relevant parameters required to calculate the natural gas venting standpipe according to the basic data;

[0150] Among them, the mass flow rate of natural gas venting:

[0151] m q = 2 π D 2 ( P ZRT ) · L T v = 2 π · 1.0 26 2 ( 5...

Embodiment 3

[0175] Calculate that the gas pipeline described in Example 1 shortens the maximum emptying time by 6h (2.16×10 4 s) After venting the height of the riser in the valve chamber of the first level area.

[0176] S031. The trunk line pipe diameter to which the venting riser belongs is 1026mm (1.026m), and the operating pressure is 5Mpa (5×10 6 Pa), the distance between valve chambers is 32km (3.2×10 4 m), the natural gas compression factor is 0.87, the operating temperature is 20℃ (293K), and the maximum emptying time is 8h (2.88×10 4 s). The area where the venting riser is located is grade one, there is no building within 10m, and the local average wind speed at a height of 20m u ∞ =8.94m / s;

[0177] S035. Calculate the relevant parameters required to calculate the natural gas venting standpipe according to the basic data;

[0178] Mass flow rate of natural gas venting:

[0179] m q = 2 π D 2 ( P ZRT ) · L T v = 2 π · 1.0 26 2 ...

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Abstract

The invention relates to a method for calculating the height of a venting riser of a natural gas transmission pipeline. The method comprises the steps of: (A) collecting basic parameters of the main trunk pipeline to which the venting riser belongs and environmental parameters of the area in which the riser is located; (B) calculating related parameters needed by the calculation of the height of the natural gas venting riser according to the basic data collected in the step (A); (C) selecting the shortest distance to a horizontal building according to the level of the area in which the venting riser is located and the venting flame thermal radiation radius calculated in the step (B); and (D) calculating the initial value, H-initial, of the height of the natural gas venting riser according to the step (B) and the step (C), and comparing the H-initial with the height h of a highest building within 10m, wherein if the H-initial is greater than (h+2), the height H of the venting riser is equal to max([H-initial], 10), but if the H-initial is less than (h+2), the height H of the venting riser is equal to max([h+2], 10). The method provided by the invention is clear in calculation flow, and simple and convenient in formula; the method is capable of obtaining the accurate height value of the natural gas venting riser and providing an important basis for the design and safety guarantee of the natural gas transmission pipeline.

Description

Technical field [0001] The invention relates to the technical field of natural gas transmission pipeline design and safety assurance, in particular to a method for calculating the height of a natural gas transmission pipeline emptying standpipe. Background technique [0002] The natural gas venting standpipe can also be called a natural gas venting pipe, and its main function is to safely discharge a large amount of natural gas in a short time. One of its functions is to prevent the pipeline explosion accident due to overpressure operation of the pipeline; the second is to reduce the amount of natural gas discharged at the accident location after the pipeline leaks, and to reduce the consequences of the accident; the third is to empty the pipeline to meet the pipeline Daily maintenance requirements of the station yard. Therefore, the natural gas vent riser is an important safety facility for the transmission pipeline. [0003] Since natural gas is a flammable and explosive gas, t...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 李长俊吴瑕贾文龙廖柯熹李卓然
Owner 四川庆达实业集团有限公司
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