Acoustic Emission testing

Storage tanks penetration hole detection

Update time：2012-03-12 10:12　　　 Viewed：次

Acoustic emission online monitoring technology of the vertical storage tanks is an important content of the maintenance plan, it cannot replace internal inspection and maintenance, can only be listed according to the degree of acoustic emission activities more effectively a repair plan. However, the acoustic emission online detection of vertical storage tank is also very obvious, the advantages of it can help managers to determine whether you need tank maintenance, determine the priority to be repair tank, optimizing maintenance resources, suitable for risk inspection plan.

Through laboratory simulation of vertical storage tank floor corrosion leakage and acoustic emission testing experimental research and field atmospheric vertical metal tank online acoustic emission detection, accumulated the test data, for our country large vertical metal tank online popularization and application of acoustic emission testing technology provides a reliable basis.

Large vertical metal tank has large volume, distribution and storage of flammable, explosive, toxic media, in the event of leakage or explosion accidents often cause disastrous consequences, and serious environmental pollution, to social economy, the production and people's life bring great loss and damage.

With the rapid growth of the world's oil industry and increasing demand for energy, crude oil and refined oil reserves has received the widespread attention of all countries, more and more is also high to the requirement of all kinds of oil reserve capacity, and thus the number of all kinds of storage tank. At present, 100000 m3 tank has become China's petroleum and chemical industry the main structure of crude oil storage tank construction. Due to various reasons, atmospheric vertical storage tank accidents frequently, huge economic loss. Tank is the main reason of the corrosion and leakage accident caused by outer corrosion is mainly the outer wall of oil tank bottom soil corrosion and wet atmospheric corrosion; Inner corrosion is mainly for the tank bottom, wall and roof corrosion, in the state of the corrosion, corrosion of tank bottom is the most difficult to deal with.

Solve the problem of corrosion of tank bottom, prevent leakage accident means has two kinds: one is strengthening anticorrosion measures during the tank construction, nip in the bud. During the second is to use to strengthen monitoring, control, found the problem in advance, arrange maintenance plan. For the second method, longterm since, our country mainly adopts regularly can examination method to evaluate the strength and security of the storage tank, this method needs to be shutdown, it cans, tank and displacement to detect, laborious, the high cost of testing, and may cause environmental pollution. Due to production needs to wait for a reason, a lot of storage tank can not be timely check. Besides regular open cans census found only a small amount of storage tank problems, cause a lot of waste.

In the 1980 s began using acoustic emission technology to foreign largescale atmospheric online detection research and application of ground storage tank, in recent years, domestic also for leakage source of acoustic emission detection mechanism and field application were studied. Mainly using load changes, leakage of turbulent flow noise, corrosion thinning area produce certain deformation or corrosion caused by acoustic emission signals generated by layer peeling and cracking, leakage source about the existence of tank bottom (or potential leakage sourcelocal or uniform corrosion) make judgments, and determine its position, the overall state of corrosion of tank bottom make realtime preliminary judgment, combined with the local ultrasonic thickness of tank wall or roof as a result, finally make a comprehensive safety assessment to the integrity of the tank.
(Editor：admin)

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