(substitutable examination of the permanent pressure vessels)

The EKO-WIATR BIS company disposes of the necessary devices and the experience which enables to organize and perform the periodical examinations of the permanent pressure vessels with the UDT in the form of the internal examination after 10 years, using the supplementing method with the usage of acoustic emission.

In accordance with the Ordinance of the Minister of the Economy, Labour and Social Policy from 9 July 2003, on the national terrain of Poland, the periodical examination in the form of the internal examination should be performed on time of 10 years from the date of the vessels production. This obligation should relate the owners of the wind turbines in which the hydraulic system includes the permanent pressure vessels under the UDT registration. The procedure included into the above mentioned Ordinance requires from the operator the necessity to dismantle the vessel and to send it for the examination on the testing stand, its mantling again on the turbine and finally performing the examination required by the local UDT department. The comprehensive performance of such a process corresponds to increased financial expenses, the risk of oil leakage, and long disconnection of the wind turbine from production.

Until now the EKO-WIATR BIS company realized, with the positive result, the inner examination of permanent pressure vessels with the usage of the supplementing method on 45 wind turbine generators throughout Poland.

Substitutable examination with method of acoustic emission (AE), non-harmful examination, of the pressure vessels in the wind turbines.


During the examination performed, the procedure was prepared and used in order to replace the classical method of the internal examination allowing the usage of the acoustic emission as the substitutable method. The EKO-WIATR BIS company developed a device enabling to execute the above mentioned method of the substitutable examination. The method and the devices have been covered by patent protection – application in the Patent Office of the Republic of Poland no P.424958.

The examinations with the usage of AE oblige meeting the determined technical criteria before entering into and during the examinations themselves. The scope of the conditions which should be realized, in order to perform the substitutable examinations are presented by the CLDT after the written application of the operator. 

The implementation of the described procedure makes it incomparably easier, in comparison with the classical method, to perform the examinations, required by the regulation, which results in the huge financial savings.

The substitutable method allows:

  • To minimize the time of stopping the turbine (the complete examination is possible to be realized within 6-8 hours)
  • All pressure vessels mantled in the turbine are examined at the same time
  • Lack of necessity to dismantle the vessels
  • After performing the examination with the positive result, the decision and protocol allowing for the further exploitation, without the necessity of the next visit of the UDT.
  • Lack of leakages, damages of the sealing during the dismantling of the vessels.


The scope of the experience and devices specially developed for this method, which our company disposes, allows with practically no interference to meet the requirements from the CLDT in order to organize and perform the whole process of the examination.


EKO-WIATR BIS Krzysztof Statuch, Spółka Komandytowa
98-200 Sieradz, ul. Jana Pawła II 52/452, tel. +48 43 822 08 31
Robert S.  ©2020 EKO-WIATR BIS

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