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Oil Protected and Pressure Compensated Bolt Connections

IP.com Disclosure Number: IPCOM000189541D
Published in the IP.com Journal: Volume 9 Issue 11B (2009-11-23)
Included in the Prior Art Database: 2009-Nov-23
Document File: 1 page(s) / 81K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Pressurized equipment often will be operated in environment where the material selection of housing (casing/end covers) and bolted connections are highly challenged. To optimize the sizing of the equipment high strength bolt materials are required. These materials however are susceptible to failure due to hydrogen and associated cracking caused by cathodic protection systems. Also other corrosion criteria do influence the bolted connection design in a negative way. In such a case often low or lower strength materials are applied that negatively influence the sizing and weight of the equipment. For offshore and subsea installations this is not beneficial. Also coating or very special and expensive materials are applied.

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Oil Protected and Pressure Compensated Bolt Connections

Idea: Gerard Korenblik, NL-Hengelo

Pressurized equipment often will be operated in environment where the material selection of housing (casing/end covers) and bolted connections are highly challenged. To optimize the sizing of the equipment high strength bolt materials are required. These materials however are susceptible to failure due to hydrogen and associated cracking caused by cathodic protection systems. Also other corrosion criteria do influence the bolted connection design in a negative way.

In such a case often low or lower strength materials are applied that negatively influence the sizing and weight of the equipment. For offshore and subsea installations this is not beneficial. Also coating or very special and expensive materials are applied.

The novel solution might be to protect the bolt connections by means of oil filled pressure compensated area. This can be realized by installing an extra 0-ring at the outside of the bolt connection pitch circle and a sealed cover over each bolt and nut. The pressure compensation can be realized by a separate device or integrated in the sealed cover by proper (elastic) material selection.

Advantageous of this solution is that there is more freedom to optimize equipment by using high strength bolt materials that are standard available that r...