Analysis of hazards and risk of capacitive equipment operation

Equipment of the oil and gas chemical complex features a variety of designs and materials used, availability of stress concentrators, impact of H2S-containing media, pressures, temperatures. Processing addressing new oil fields containing mercaptans and hydrogen sulphide requiring on-site application of chemicals (the so-called hydrogen sulphide scavengers) resulted in excessive corrosive activity of the feed [1].

In this regard, safe operation of pressure vessels (and capacitive equipment as a typical representative) greatly depends on the correct choice and strength analysis of the material design, including hanger-support systems of connected pipelines.

Capacitive equipment of 09G2S steel of the primary treatment unit at Ryazan Oil Refinery Company JSC in operation for no more than 3 years was selected for examination. Based on the technical diagnostics data, damage and discontinuity areas have been detected on internal and external surfaces of shell courses.

According to GOST 12.3.047, the method to assess the consequences of emergency spill ignitions was selected realized in TOXI+Risk software package. Scenarios of possible emergencies enable to conclude that improper material design, vibration and stem oscillations of process pipelines on the equipment flanges resulting in damage and deterioration of the shell are the most dangerous events [2].

  1. Burlov V.V., Altsybeeva A.I., Kuzinova T.M. Anticorrosive protection of oil processing equipment. Saint Petersburg, 2015. 336 p.

  2. Zakharov V.A., Borisenko V.V. Diagnostics of equipment wear using magnetic and acoustic characteristics of metal//Chemical Engineering. 2016. No. 12. P.25–27.

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