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lompiacv
Posted: Thu 15:03, 13 Jan 2011
Post subject: moncler outlet On the East Gas Transmission Pipeli
On the East Gas Transmission Pipeline Project-ray detection part of the film production of black spot phenomenon
The ratio of negative spots are still high, indicating that factors which lead to film production is still the main cause of six black spots: the film during transit or film friction with the ground,
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, pipe friction surface relative to long-distance pipeline construction site is usually are carried out in the field under harsh conditions, East Gas Transmission Pipeline Project is no exception. I assume this is a test V Section of the worst conditions of the mountain section of the Department of the resident from our program to reach all sections of the construction site for the mountain, the road narrow,
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, bumpy,
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, film in transit is inevitable friction with each other or with other objects relative to friction; the same time, testing personnel handling the film in the detection field or on the distribution of films in the pipeline longer appear in the film surface or film the phenomenon of drag pipes, which makes the film will be compared with the ground or pipe surface friction . These frictions will photosensitive film by the friction parts in advance, by irradiation in the secondary will be produced when the light-sensitive, so the corresponding parts in the film have black spots. To this end, I take the following verification measures: a) on the film by the friction in the transport process strictly controlled conditions. b) requires inspectors on-site transportation or distribution of films in the pipeline is strictly prohibited on the ground or pipe the film drag on. Verified by several times, for taking the above measures, the film on the black spot was gone. Description This is the result of a large number of black spots on the film the main reason, is often easily ignored. Also in the above-mentioned increase of screen thickness helps to reduce the phenomenon of black spots on the film, in fact, the very nature of screen and not so much, but the thickness of screen film by the friction can slow down the increase in the extent to which made to reduce black spots on the film. Length film and short film 3 Comparison of the phenomenon of why the black spots appear on the film easier in the long short film was in less of it? In fact, from the analysis of the causes on the face, the investigation shows: Three reasons, because V and Six reasons to generate a negative phenomenon causes black spots,
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, while the fifth is even more important because more easily overlooked factor. When a short film in the transport of the testing companies are generally put on the film set box or box, by the friction of the probability of small, moving film, or cloth in the field of films will not occur in the ground or drag on the pipe; and transport When the testing company long film will also be film tied into the general volume set put in the car, but often do not neglect this part of or tied with sturdy materials with the store-specific, in the loose after being tossed to each other friction, at the same time handling film or cloth in the field of films because the film is longer, testing staff effort and prone figure on the ground or pipe drag phenomenon. Therefore, the phenomenon of black spots on the film easy to produce in the long and the short film has less to see. 4, the phenomenon of black spots for some preventive measures taken (1) When the environmental humidity should be kept and used to do film work. (2) limited by local conditions, washing machine when the water without purification, washing machine should be prepared for cleaning and filtering water. (3) within the standard thickness of greater use of intensifying screens. (4) The proper place to do film work during transport to prevent the film friction with each other or with other objects relative to friction. Now I am using the placement method recommended below for your reference: transported to the testing site will be ready to drive into a film roll, a roll of film for every ten, the volume size should be appropriate and easy to make of screen is too small fracture , too much is easy to disperse, while the volume of the disk into a strapping strong to prevent the bumps during transit to each other after the loose friction; made slightly larger than the diameter of film roll or wooden pots, wooden boxes or pots on the bottom and all around pad covered with sponge, place each wooden box, or pots to keep 1 or 2 rolls of film of the volume, roll the film put in the wooden box set, so that the transport process can effectively reduce the mutual friction between the film or with the surrounding objects friction. (5) requires inspectors in the field or in the nozzle moving film on the cloth piece is strictly prohibited on the ground, dragging the film on the pipe should be gently. 5 Conclusion (1) East Gas Transmission pipeline on the radiographs produced the phenomenon of black spots is not an isolated phenomenon, the phenomenon occurs through a variety of possible factors in the investigation can be seen: with a long film, transport and field film during the friction test, the environment humidity,
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, which can cause poor water quality of the occurrence of this phenomenon. (2) film on the black spot phenomenon, by the \(3) as long as the response to the above reasons, to take corresponding measures, can avoid the phenomenon of black spots. (4) The radiographic film in black spots on the phenomenon was not just in East Gas Transmission Pipeline Project have, in fact, as long as long-distance pipeline projects through testing, this phenomenon will be more or small to appear. This article will give hope to provide some useful reference counterparts.
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