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Innovative Method to Double Block and Bleed

[+] Author Affiliations
Frank Dum, Colin Drysdale

T. D. Williamson Inc., Tulsa, OK

Paper No. IPC2010-31346, pp. 379-382; 4 pages
  • 2010 8th International Pipeline Conference
  • 2010 8th International Pipeline Conference, Volume 3
  • Calgary, Alberta, Canada, September 27–October 1, 2010
  • Conference Sponsors: International Petroleum Technology Institute and the Pipeline Division
  • ISBN: 978-0-7918-4422-9 | eISBN: 978-0-7918-3885-3
  • Copyright © 2010 by ASME


Double Block and Bleed (DBB) is the preferred approach used to maximize safety while performing piping maintenance. The aim of the paper is to outline an innovative method of achieving DBB on pressurized piping or pipelines. DBB is traditionally achieved by several methods, for example, through using Two Valves, a Valve & a STOPPLE® plugging head, a STOPPLE plugging head & an Isolation Plug or Tandem STOPPLE plugging heads. There are also several DBB methods which utilize inflatable bags or bladders. The STOPPLE Train is a patent pending tool that uses 2 STOPPLE® plugging heads. Only one hot tap is required in the piping for which the STOPPLE Train is inserted. The first STOPPLE plugging head is the trailing plugging head and forms a primary seal. The second STOPPLE plugging head is the leading plugging head and forms a secondary seal. Once sealed, the bleed is accomplished through a relief port allowing downstream maintenance to commence.

Copyright © 2010 by ASME



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