CN102466135A - Method for controlling seepage of steam system in blowing and steam-testing process - Google Patents
Method for controlling seepage of steam system in blowing and steam-testing process Download PDFInfo
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- CN102466135A CN102466135A CN2010105437365A CN201010543736A CN102466135A CN 102466135 A CN102466135 A CN 102466135A CN 2010105437365 A CN2010105437365 A CN 2010105437365A CN 201010543736 A CN201010543736 A CN 201010543736A CN 102466135 A CN102466135 A CN 102466135A
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Abstract
The invention provides a method for controlling seepage of a steam system in a blowing and steam-testing process. The method comprises the following steps of: respectively calculating a thermal expansion stress which is about to generate inside a pipeline and an axial thrust force generated in the pipeline according to a formula that sigma equals to 24 delta t kg/cm<2> (delta t is a difference between pipeline work temperature and assembling temperature) and a formula that F equals to A sigma (A is the cross section of the pipeline); determining the hot-state fastening strength of a fastening bolt of the system according to the thermal expansion stress and the axial thrust; and determining the temperature and the number of fastening when the fastening bolt is fastened according to the work temperature of the system. The method is used for determining the hot-state fastening strength and the fastening time of the fastening bolt in the system by utilizing the attribute of expansion caused by heat and contraction caused by cold of metal, so that the seepage phenomenon of the steam system in the blowing and steam-testing process can be effectively controlled.
Description
Technical field:
The present invention relates to a kind of Antiseep method, particularly a kind of vapour system is purging, is trying the seepage controlling method in the vapour process.
Background technique:
Steam function property system like work progresss such as: steam generating system (steam generator system, steel-making evaporated cooling system etc.), steam-heating system, steam regenerative systems in; Vapour system is along with the process of accepting medium; Whole system progressively becomes the stressed system of a complicacy owing to receive the influence of pipeline body expanded by heating; Though can compensate the swell increment of pipeline through design; But in the zone that pipe fitting, elbow etc. are concentrated, almost all can receive several kinds of active forces of different direction in the joint of each flange, when this comprehensive force area that causes by a plurality of factors to a certain degree the time; If in time do not control through adding restraining force; Flange will be by parallel dense state slowly toward Duckbill type angle change of state, is perhaps progressively squinted by parastate and is changed to the relative displacement state, thereby cause the destruction of flange facing and produce seepage.System is through after the humid test, purge, examination vapour is during the stage, in the joint of flange even the secondary seepage can often occur, even the situation of seepage repeatedly, thereby causes the repetition work pressure test, the consumption worker is consuming time, incurs loss through delay the duration.
Summary of the invention:
The object of the invention just is to overcome the deficiency that exists in the above-mentioned existing technology; And provide a kind of vapour system purging, trying the seepage controlling method in the vapour process; The attribute that this method utilizes metal itself to expand with heat and contract with cold can be controlled the seepage phenomenon that vapour system takes place effectively in purging, examination vapour process.
As above design, technological scheme of the present invention is: a kind of vapour system is characterized in that: according to formula σ=24 Δ t kg/cm purging, trying the seepage controlling method in the vapour process
2(temperature was poor when Δ t was pipeline operating temperature and installation) and formula F=A σ (A is the sectional area of pipeline) calculate the end thrust of pipe interior with thermal expansion stress that produces and pipeline generation respectively, confirm the hot fastening dynamics of system's clamping bolt according to thermal expansion stress and end thrust then; Temperature and fastening number of times when confirming that according to the operating temperature of system clamping bolt is fastening simultaneously.
During the operating temperature of said system＜250 ℃, system's bolt need carry out once fastening in the time of 150 ℃; When the operating temperature of system during at 250 ℃～380 ℃, system's bolt need carry out once fastening under the operating temperature state; When operating temperature＞380 of system ℃, system's bolt need carry out once fastening in the time of 350 ℃, and it is fastening under the operating temperature state, to carry out secondary.
When above-mentioned clamping bolt was M16, the length of spanner should be 250mm, the one man operation.
When above-mentioned clamping bolt was M20, the length of spanner should be 300mm, the one man operation.
When above-mentioned clamping bolt was M22, the length of spanner should be 300mm, and added the sleeve pipe of L=400mm, double operation.
When above-mentioned clamping bolt was M24, the length of spanner should be 350mm, and added the sleeve pipe of L=400mm, double operation.
When above-mentioned clamping bolt was M32, the length of spanner should be 350mm, and added the sleeve pipe of L=500mm, double operation.
The attribute that the present invention utilizes metal itself to expand with heat and contract with cold with hot fastening dynamics, the fastening time of clamping bolt in definite system, thereby can be controlled the seepage phenomenon that vapour system takes place effectively in purging, examination vapour process.
Embodiment:
The weldless tube that a Φ 426 * 10 is for example arranged, the temperature after putting into operation are 150 ℃, and the temperature when installing is 20 ℃, then:
Thermal expansion stress σ=24 Δ t=24 * (150-20)=3120kg/cm
2
Sectional area A=π [(D/2)
2-(d/2)
2]=3.142 * [(42.6/2)
2-(40.6/2)
2]=130.7cm
2
So the end thrust that pipeline produces is F=A σ=3120 * 130.7=407784Kg.
In view of the above, can confirm that should adopt decreased food when clamping bolt is fastening is the spanner of 350mm, and add the sleeve pipe of 400mm, need double operation.Because the system works temperature less than 250 ℃, therefore, should be carried out once fastening when 100 ℃ of left and right sides.
Claims (7)
1. a vapour system is characterized in that: according to formula σ=24 Δ t kg/cm purging, trying the seepage controlling method in the vapour process
2(temperature was poor when Δ t was pipeline operating temperature and installation) and formula F=A σ (A is the sectional area of pipeline) calculate the end thrust of pipe interior with thermal expansion stress that produces and pipeline generation respectively, confirm the hot fastening dynamics of system's clamping bolt according to thermal expansion stress and end thrust then; Temperature and fastening number of times when confirming that according to the operating temperature of system clamping bolt is fastening simultaneously.
2. vapour system according to claim 1 purge, seepage controlling method in the examination vapour process, it is characterized in that: during the operating temperature of said system＜250 ℃, system's bolt need carry out once fastening in the time of 150 ℃; When the operating temperature of system during at 250 ℃～380 ℃, system's bolt need carry out once fastening under the operating temperature state; When operating temperature＞380 of system ℃, system's bolt need carry out once fastening in the time of 350 ℃, and it is fastening under the operating temperature state, to carry out secondary.
3. vapour system according to claim 1 is purging, is trying the seepage controlling method in the vapour process, and it is characterized in that: when above-mentioned clamping bolt was M16, the length of spanner should be 250mm, the one man operation.
4. vapour system according to claim 1 is purging, is trying the seepage controlling method in the vapour process, and it is characterized in that: when above-mentioned clamping bolt was M20, the length of spanner should be 300mm, the one man operation.
5. vapour system according to claim 1 is purging, is trying the seepage controlling method in the vapour process, and it is characterized in that: when above-mentioned clamping bolt was M22, the length of spanner should be 300mm, and added the sleeve pipe of L=400mm, double operation.
6. vapour system according to claim 1 is purging, is trying the seepage controlling method in the vapour process, and it is characterized in that: when above-mentioned clamping bolt was M24, the length of spanner should be 350mm, and added the sleeve pipe of L=400mm, double operation.
7. vapour system according to claim 1 is purging, is trying the seepage controlling method in the vapour process, and it is characterized in that: when above-mentioned clamping bolt was M32, the length of spanner should be 350mm, and added the sleeve pipe of L=500mm, double operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010543736.5A CN102466135B (en) | 2010-11-15 | 2010-11-15 | The method for controlling seepage of vapour system in purging, examination vapour process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010543736.5A CN102466135B (en) | 2010-11-15 | 2010-11-15 | The method for controlling seepage of vapour system in purging, examination vapour process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102466135A true CN102466135A (en) | 2012-05-23 |
| CN102466135B CN102466135B (en) | 2015-10-21 |
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| CN201010543736.5A Active CN102466135B (en) | 2010-11-15 | 2010-11-15 | The method for controlling seepage of vapour system in purging, examination vapour process |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1800698A (en) * | 2005-03-25 | 2006-07-12 | 华南理工大学 | Control system of burner for heating in crude oil gathering and transportation |
| CN201062713Y (en) * | 2007-01-11 | 2008-05-21 | 辽宁石油化工大学 | Device for simulating gas storage and peak regulation |
| CN201126100Y (en) * | 2007-11-08 | 2008-10-01 | 西安长庆科技工程有限责任公司 | Oil-gas mixed transporting apparatus for processing large strand segment plug flow in petroleum crude concentrated transporting course |
| CN201202284Y (en) * | 2008-05-12 | 2009-03-04 | 庞健锋 | Leakage-proof structure of steam house body |
-
2010
- 2010-11-15 CN CN201010543736.5A patent/CN102466135B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1800698A (en) * | 2005-03-25 | 2006-07-12 | 华南理工大学 | Control system of burner for heating in crude oil gathering and transportation |
| CN201062713Y (en) * | 2007-01-11 | 2008-05-21 | 辽宁石油化工大学 | Device for simulating gas storage and peak regulation |
| CN201126100Y (en) * | 2007-11-08 | 2008-10-01 | 西安长庆科技工程有限责任公司 | Oil-gas mixed transporting apparatus for processing large strand segment plug flow in petroleum crude concentrated transporting course |
| CN201202284Y (en) * | 2008-05-12 | 2009-03-04 | 庞健锋 | Leakage-proof structure of steam house body |
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| CN102466135B (en) | 2015-10-21 |
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