• English
    • norsk
  • English 
    • English
    • norsk
  • Login
View Item 
  •   All institutions
  • Norges teknisk-naturvitenskapelige universitet
  • Fakultet for ingeniørvitenskap (IV)
  • Institutt for energi og prosessteknikk
  • View Item
  •   All institutions
  • Norges teknisk-naturvitenskapelige universitet
  • Fakultet for ingeniørvitenskap (IV)
  • Institutt for energi og prosessteknikk
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Improvement of response time and cutting capability of Blow Out Preventer (BOP)

Østby, Petter
Master thesis
Thumbnail
View/Open
4282_FULLTEXT.pdf (1.995Mb)
4282_ATTACHMENT.zip (40.00Mb)
4282_COVER.pdf (90.59Kb)
Permanent link
http://hdl.handle.net/11250/2353739
Issue date
2008
Share
Metadata
Show full item record
Collections
  • Institutt for energi og prosessteknikk [1560]
Abstract
There is a general demand in the market for BlowOut Preventers (BOP), which are

capable of cutting tougher materials and cutting them faster than what is available

today. This will give better safety and a more efficient use of the equipment. Better

cutting capabilities are directly related to the pressures available to the cutting actuator.

Normal accumulators loose pressure while it is drained. To avoid this a gas tank with

high pressure nitrogen is proposed to boost the pressures during the cutting operation.

A boost tank will however contain pressures which are much higher then the allowed

pressure in the BOP circuit. It is therefore necessary with a governor which controls

the pressure. Normal pressure regulating valves tend to have difficulties maintaining a

constant pressure while the pressure in the boost tank drops. Therefore is a PI-governor

proposed, which may increase the stability and reliability of the BOP.

This report focuses mainly on the design of the PI-governor and how to optimize its

design and parameters. The results are promising and the solution shows a more stable

pressure than both the old accumulator solution and normal pressure regulating valves.

There are however a few flaws with the design. First; may even very small leakages

and changes in material properties severely reduce and/or destroy the efficiency of the

governor. Small leakages may quickly increase the system pressures and empty the

boost tank. Another problem is the overlap in normal proportional directional valves.

This severely reduces the efficiency of the integrator in the governor.

A mechanism for refilling the boost tank using a high pressure supply line from the

rig is found to work quite well in simulations. The nitrogen gas is pushed back into

the boost tank and the system is reset.
Publisher
NTNU

Contact Us

Search NORA
Powered by DSpace software

Service from BIBSYS
 

 

Browse this CollectionIssue DateAuthorsTitlesSubjectsDocument TypesJournalsBrowse all ArchivesArchives & CollectionsIssue DateAuthorsTitlesSubjectsDocument TypesJournals

My Account

Login

Statistics

Google Analytics StatisticsView Usage Statistics

Contact Us

Search NORA
Powered by DSpace software

Service from BIBSYS